JPH08101416A - Laser beam generator - Google Patents

Abstract

PURPOSE: To reduce a size and electric power consumption by calculating the corrected value of driving current for driving a semiconductor element from an estimated operation temp., etc., and changing the driving current of the semiconductor laser. CONSTITUTION: The temp. signal measured by a temp. sensor 14 is supplied to a temp. estimating circuit 21 for estimating the operating point temp. of an exciting LD chip 11. The SHG output power data of a laser resonator fluctuates when the temp. in an LD chip mounting block changes. The data of a temp. dependent table 22 of the SHG output power storing the SHG output power data is supplied to an LD driving current correction value calculating circuit 23. This LD driving current correction value calculating circuit 23, thereupon, calculates the correction value of the LD driving current at an arbitrary temp. in order to maintain the SHG output power constant. An LD driving circuit 25 supplies the LD driving current obtd. by correcting the standard value of the LD driving current with the correction value thereof to the exciting LD chip 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser beam generator for converting a fundamental laser beam emitted from a pumped solid-state laser into a wavelength and emitting a short wavelength laser beam, for example.

[0002]

2. Description of the Related Art It has hitherto been proposed to perform wavelength conversion efficiently by utilizing a high power density inside a resonator. For example, an external resonance type second harmonic generation (hereinafter referred to as SH
(Referred to as “G”) or SHG using a nonlinear optical crystal element inside the laser resonator has been attempted. Of these, FIG. 9 shows a small integrated SHG green laser that outputs the second harmonic light by SHG using a nonlinear optical crystal element. This compact integrated SHG green laser has a laser diode (LD) chip 31 which is a semiconductor laser, a condenser lens 32, an SHG laser resonator 33, a temperature sensor 34, and a thermoelectric cooler 39 in a package 30. are doing.

The LD chip 31 is disposed on the LD chip mounting block 35 and oscillates in a longitudinal multimode and a lateral multimode over, for example, about 2 nm. The LD chip mounting block 35 incorporates the temperature sensor 34 such as a thermistor. The temperature sensor 34 measures the temperature inside the LD chip mounting block 35. SH
The G laser resonator 33 is a quarter wavelength plate 33a, L for stabilizing the laser light whose wavelength is converted by the resonance operation.
A laser medium 33b such as an Nd: YAG crystal that absorbs the excitation laser beam from the D chip 31 and generates a fundamental wave laser beam, and a plane perpendicular to the oscillation laser optical axis of each component forming the resonator 33. Spacer 3 for maintaining parallelism of
3c, which is constituted by a non-linear optical crystal element 33d such as KTP (KTiPO ₄ ), and is supported by the resonator support block 36.

The condenser lens 32 is fixed to the lens mounting block 37 and focuses the pump laser light from the LD chip 31 on the laser medium 33b in the SHG laser resonator 33. The LD chip mounting block 35, the resonator support block 36, and the lens mounting block 37 are arranged on a base substrate 38. This base substrate 38
In the lower part of the table, the LD chip 31 and the SHG laser resonator 33 are cooled via the LD chip mounting block 35 and the resonator support block 36 in accordance with the temperature detected by the temperature sensor 34, for example, thermoelectric effect using Peltier effect. A thermoelectric cooler 39 formed by cooling elements is provided.

The SHG laser resonator 33 of the small integrated SHG green laser has the laser medium 3 excited by the excitation laser light emitted from the LD chip 31.
The fundamental wave laser light generated by 3b is emitted as second harmonic laser light through the nonlinear optical crystal element 33d while being reflected by each reflecting surface in the SHG laser resonator 33.

[0006]

By the way, in the compact integrated type SHG green laser as described above, since the thermoelectric cooler is used, the miniaturization of the package cannot be achieved. Further, when the small integrated SHG green laser is applied to a portable device, the battery power consumption by the thermoelectric cooler increases, so that the operable time of the battery is shortened.

Therefore, in order to achieve the miniaturization of the package and the reduction of battery power consumption, it is conceivable that the thermoelectric cooler is not used. However, this eliminates the temperature control part, so that the harmonic light due to the temperature change is eliminated. Output power fluctuation occurs. Further, in order to make adjustments such as keeping the output power of harmonic light constant, it is necessary to directly monitor the output power with a photodetector and feed it back to the drive current of the pump laser. Since the drive current and the output power have a non-linear relationship, complicated control is required.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a laser light generator capable of achieving miniaturization and low power consumption.

[0009]

A laser light generator according to the present invention is a semiconductor laser element that emits excitation light, a laser that is excited by the excitation light to generate a fundamental wave, and the fundamental wave is wavelength-converted. In a laser light generator comprising a wavelength conversion means for emitting light, temperature measuring means for measuring the temperature in a block to which the semiconductor laser element is attached, and the semiconductor laser from the temperature measured by the temperature measuring means. The operating point temperature estimating means for estimating the operating point temperature of the element, the storage means for storing in advance the output power data of the wavelength converting means for the operating point temperature of the semiconductor laser element, and the operating point temperature estimating means Correction value calculation means for calculating a correction value of a drive current for driving the semiconductor laser device based on the estimated operating temperature and data from the storage means,
The above problem can be solved by including a driving unit that changes the driving current of the semiconductor laser according to the correction value of the correction value calculating unit.

In this case, the wavelength conversion means is composed of a resonator having a quarter wavelength plate, a laser medium, and a nonlinear optical crystal element. In addition, the drive means,
It is characterized in that a continuous drive current is changed and supplied to the semiconductor laser device according to the correction value. Also,
The drive unit may supply an intermittent drive current to the semiconductor laser device by changing the drive current according to the correction value.

The wavelength conversion means stabilizes the wavelength-converted laser light within an allowable range depending on the purpose of use.

[0012]

The driving means changes the driving current of the semiconductor laser in accordance with the correction value calculated by the correction value calculating means based on the estimated operating temperature from the operating point temperature estimating means and the data from the storing means. The temperature control system for the element and the wavelength conversion means is unnecessary. Therefore, the laser light generator according to the present invention can achieve downsizing and low power consumption.

[0013]

Embodiments of the laser light generator according to the present invention will be described below with reference to the drawings. In this embodiment, for example, a light beam is emitted from a distant position toward a projection type screen on which an overhead projector (OHP) or a slide photograph is projected, and a light spot is formed on the screen to form a desired spot. It is a compact integrated second harmonic generation (hereinafter referred to as SHG) green laser used for an optical beam pointer that emphasizes and indicates. Here, since the small integrated SHG green laser generates a green laser beam having a wavelength of 532 nm, the screen is irradiated with a green beam.

Since the light beam pointer is often held by a user with one hand, it is required to be small. Further, since it is driven by a battery, it is desirable that the battery power is not consumed so much. Therefore, the small SHG green laser needs to be downsized and consume less battery power. As shown in FIG. 1, this compact integrated SHG green laser has a laser diode (hereinafter referred to as pump LD) chip 11 for excitation, which is a semiconductor laser, in a package 10, a condenser lens 12,
The SHG laser resonator 13 and the temperature sensor 14 are incorporated.

The pumping LD chip 11 is arranged on the LD chip mounting block 15 and oscillates in a longitudinal multimode and a lateral multimode over, for example, about 2 nm and continuously emits a pumping laser beam. This LD chip mounting block 15
Incorporates the temperature sensor 14 such as a thermistor. The temperature sensor 14 measures the temperature of the LD chip mounting block 15. The temperature of the LD chip mounting block 15 detected by the temperature sensor 14 is
It is used to estimate the operating point temperature of the excitation LD chip 11.

The SHG laser resonator 13 is a quarter for stabilizing the laser light whose wavelength is converted by the resonance operation.
For example, Nd: YAG that absorbs the pump laser light from the wave plate 13a and the pump LD chip 11 to generate the fundamental laser light
Laser medium 13b such as crystal, SHG laser resonator 1
The spacers 13c for maintaining the parallelism between the planes perpendicular to the oscillation laser optical axis of each component constituting the third component, such as KTP (KTi).
It is constituted by a nonlinear optical crystal element 13d such as PO ₄ ) and is supported by the resonator support block 16.

The condenser lens 12 is fixed to the lens mounting block 17 and focuses the pump laser light from the pump LD chip 11 onto the laser medium 13b in the SHG laser resonator 13. These LD chip mounting block 15, resonator supporting block 16, lens mounting block 17
Are arranged on the base substrate 18.

The package 10 includes a heat sink portion 10a installed under the base substrate 18 and a small SHG.
The lid portion 10b is formed to cover the green laser and has an emission hole for emitting the SHG laser light. And the S of this small integrated SHG green laser
The HG laser resonator 13 is a laser medium 13 b excited by the excitation laser light emitted from the excitation LD chip 11.
Of the fundamental wave laser beam generated by the SHG laser resonator 13
The light is emitted as second harmonic laser light through the nonlinear optical crystal element 13d while being reflected by each of the reflection surfaces inside.

This small integrated SHG green laser is
With the circuit as shown in FIG.
It supplies the LD drive current. Hereafter, in the circuit of FIG.
explain about. Inside the LD chip mounting block 15
The temperature signal measured by the stored temperature sensor 14 is excited.
Temperature estimation circuit 2 for estimating the operating point temperature of the LD chip 11
1 is supplied. LD drive current I_LDIs a predetermined reference value I
_LDOLD chip mounting block 1
When the temperature inside 5 changes, the SHG output of the laser resonator 13
Force power data fluctuates. This SHG output power day
Is the temperature dependence table 22 of the SHG output power in advance.
Remembered in. Temperature dependence of this SHG output power
The data of the table 22 is the LD drive current correction value calculation circuit.
23. This LD drive current correction value calculation circuit 2
3 makes the SHG output power constant based on the above data
Calculate the LD drive current correction value at any temperature for
Put out. The correction value of this LD drive current is the LD drive circuit 2
5 is supplied. This LD drive circuit 25 has an LD drive
LD drive current reference value I from the current reference value supply circuit 24
_LDOIs also being supplied. Then, this LD drive circuit 25
Is the LD drive current reference value I_LDOWas corrected with the above correction value
LD drive current I_LDIs supplied to the excitation LD chip 11.

Then, the pumping LD chip 11 emits pumping laser light by the corrected LD drive current I _LD . Upon receiving this pump laser light, the SHG laser resonator 13
_Outputs SHG laser light with constant power P _SHGconst . The operation of the circuit shown in FIG. 2 will be described below, and the reason why the small integrated SHG green laser can realize downsizing and low battery power consumption will be described.

The temperature dependence table 22 of the SHG output power data stores changes in the SHG output power with respect to temperature. First, the data stored in the temperature dependence table 22 of the SHG output power will be described.
The characteristic diagram of FIG. 3 shows the relationship between the power P _LD of the pumping laser light output from the pumping LD chip 11 and the LD drive current I _LD for driving the pumping LD chip 11 at room temperature. In FIG. 3, the horizontal axis represents the LD drive current I _LD , and the vertical axis represents the output power P _LD of the pump laser light. The pumping LD chip 11 oscillates in a multimode having a center wavelength near a wavelength of 810 nm.

As can be seen from FIG. 3, the power P _LD of the pump laser light emitted from the pump LD chip 11 is P _LD = k (T) (I _LD −I _th ) ... (1) . Here, I _th is the excitation LD as shown in FIG.
It is the threshold value of the LD drive current I _LD when the chip 11 suddenly starts increasing the power P _LD of the excitation laser light. Also, T
Is the temperature in the LD chip mounting block 15.
Further, k is a coefficient related to the temperature.

The pump laser light emitted from the pump LD chip 11 is the laser medium 13b, for example, Nd: Y.
Energy P _eff when passing through the absorption wavelength band of AG and being effectively taken into the crystal becomes P _eff = m (T) P _LD (2). Here, m (T) is energy efficiency having temperature dependence as shown in FIG. The horizontal axis of FIG. 4 represents the temperature T in the LD chip mounting block 15, and the vertical axis represents the energy efficiency m (T).

Here, the laser medium 13b, for example, N
d: The internal power P _YAG of the YAG laser is _expressed as P _YAG = s (P _eff −P _th ) = s [k (T) m (T) (I _LD −I _th ) −P _th ] ... (3) Then, the wavelength-converted SHG output light power P
_SHG is approximately P _SHG (I _LD , T) = ηP _YAG ² = ηs ² [k (T) m (T) (I _LD −I _th ) −P _th ] ² (4) expressed. In the above equation (3), P _th is Nd:
It is the threshold value of the power of the excitation light that causes the YAG laser to generate a fundamental wave.

Here, the excitation LD drive current is set to a constant value I
_LDO , SHG output power P for temperature T above
_{When SHGO} (T) is measured, it _becomes P _SHGO (T) = ηs ² [k (T) m (T) (I _LDO −I _th ) −P _th ] ² (5), and thus k (T) m (T) is

[0026]

[Equation 1]

[0027] From the above formula (6), the condition for changing the LD drive current I _LD so that the SHG output power becomes a constant value P _{SH Gconst} regardless of the temperature T is P _SHGconst = ηs ² [k (T) m (T) (I _LD (T) -I _th ) -P _th ] ² ... (7)

[0028]

[Equation 2]

It becomes From the above equations (7) and (8), L
It can be seen that the output power P _SHGO of the SHG laser light when the D drive current I _LD is set to a constant value I _LDO changes as shown in FIG. 5A depending on the temperature T of the LD chip mounting block 15. Therefore, it can be seen that the LD drive current I _LD for _setting the SHG output power to a certain constant value P _SHGconst may be changed according to the temperature T of the LD chip mounting block 15 as shown in FIG. 5B. Then, as shown in FIG. 5A, the temperature dependence of the SHG output power when the LD drive current is set to a constant value I _LDO , and
By using the LD drive current and the characteristics as shown in FIG. 5B of the temperature for making the output power of the SHG laser light a certain constant value P _SHGconst , the temperature T detected by the temperature sensor 14 is changed from the temperature T. The LD drive current can be corrected as described above, and the fluctuation of the SHG output power with respect to temperature can be suppressed.

That is, the temperature estimation circuit 21 estimates the operating point temperature of the excitation LD chip from the signal relating to the temperature measured by the temperature sensor 14. Here, the estimated operating point temperature is the SH having the characteristic shown by the above equation (5).
The G output power is supplied to the temperature dependence table 22.
The data read from the temperature dependence table 22 of the SHG output power is supplied to the LD drive current correction value calculation circuit 23 as described above. Then, the correction value from the LD drive current correction value calculation circuit 23 is supplied to the excitation LD drive circuit 25, and the LD drive current reference value supply circuit 24 is supplied.
Correct the reference value I _LDO of. Therefore, the LD drive current I _LD output from the LD drive circuit 25 can suppress the fluctuation of the SHG output power with respect to the temperature change according to the equation (8).

Here, the LD chip mounting block 15
The detected temperature inside is the ambient temperature (room temperature + palm temperature) with which the heat sink 10a having a large heat capacity is in contact.
Is approximately equal to. This is the excitation LD chip 11
It is considered that the LD chip mounting block 15 and the LD chip mounting block 15 have low thermal resistance, but the LD chip mounting block 15
This is because the heat sink 10a having a large heat capacity is also designed in advance so as to have a small thermal resistance.

Here, even if the LD drive current is changed, the temperature inside the LD chip mounting block 15 is
Since it is assumed that there is almost no change, as a condition for achieving a constant SHG output power, the excitation LD drive current to be controlled is integrally obtained from the temperature in the LD chip mounting block 15 where the ambient temperature is dominant. . By the way, if the above assumption does not hold, that is, LD
When the driving current is changed, the thermal gradient between the temperature of the excitation LD chip 11 and the ambient temperature changes, and the detected temperature in the LD chip mounting block 15 is affected. The circuit shown is required.

In this case, the LD chip mounting block 1
Since the temperature detected by the temperature sensor 14 in FIG. 5 is determined by two factors of the ambient temperature and the LD drive current in the steady state, the temperature estimation circuit in the SHG output power temperature and drive current dependency table 42 includes The temperature from the temperature sensor 14 via 41 and the LD drive current from the LD drive current value measuring circuit 44 are supplied. The data from the temperature and drive current dependency table 42 of the SHG output power is L
It is supplied to the D drive current correction value calculation circuit 43. This LD
The correction value calculated by the drive current correction value calculation circuit 43 is L
It is supplied to the D drive circuit 46. This LD drive circuit 46
Corrects the reference value I _LDO supplied from the LD drive current reference value supply circuit 45 based on the correction value, and supplies the LD drive current to the excitation LD chip 11. Further, this LD drive current is supplied to the excitation LD drive current measurement circuit 44.

Then, the pumping LD chip 11 emits pumping laser light by the corrected LD drive current I _LD . Upon receiving this pump laser light, the laser resonator 13 outputs the SHG laser light having a constant power P _SHGconst . This Figure 6
In the example shown in, the LD drive current correction data required in advance becomes enormous, and the control system becomes slightly complicated.

Since the small SHG green laser of this embodiment is applied to the light beam pointer, the stability of the output power of the SHG laser light need not be so strict. That is, this is because it is sufficient that the brightness is visually recognizable by humans and the fluctuation in brightness is not noticeable. Therefore, it is not necessary to directly monitor the SHG output power with a photodetector such as a photodetector and perform complicated control such that the SHG output power is fed back to the LD drive current by some method. It is also sufficient to estimate the power based on the temperature detected by the temperature sensor 14 and correct the LD drive current I _LD .

Actually, considering the usage situation first, LD
When the SHG laser light output power when the drive current I _LD is constant is designed so as to face the peak in a steady state where the temperature of the heat sink is stable around room temperature + palm temperature, and is used For this _purpose , the SHG laser light output power P _SHGconst , which fluctuates in the transient period from the room temperature at the time of rising to the room temperature + the temperature of the palm, may be suppressed by increasing or decreasing the LD drive current I _LD .

Next, a case where the pumping LD chip 11 intermittently emits pumping laser light will be described. Excitation LD
When the chip 11 is operated intermittently, the LD drive current I
_As shown in FIG. 7, the LD is applied to the exciting LD chip 11 in a pulse shape for t ₂ at intervals of time period t ₁ . Where 1
/ T ₁ is preferably 30 Hz or more in consideration of visibility as the laser light used for the laser pointer. actually,
Of the time periods t _1, the current application period t _2R, LD drive current I _LD is set to _{I LD = t 1 / t 2R} · I LDO, except in the section t ₁ -t _2R of the I _LD = 0 To do. Therefore, the average current becomes I _LDO shown by the broken line.

When the pumping LD chip 11 is driven intermittently as shown in FIG. 7, the wavelength-converted SHG output light power P
_SHG '(I _LD , T) is approximately P _SHG ' (I _LD , T) = t ₂ / t ₁ · ηs ² [k (T) m (T) (t ₂ / t ₁ · I _LD − I _th ) -P _th ] ² = t ₁ / t ₂ · ηs ² [k (T) m (T) (I _LD −t ₂ / t ₁ · I _th ) −t ₂ / t ₁ P _th ] ² ·・ It becomes (9).

Comparing the equation (5) with the equation (9), the LD drive current per unit time is equal to I _LD. Therefore, regarding continuous drive and intermittent drive of the excitation LD chip 11, It can be seen that although the power consumption is the same, the SHG laser light output P _SHG ′ by the intermittent drive is larger as to the average SHG output power. When the LD drive current is fixed to a certain value, for example, the ratio of the operation time in the intermittent drive is fixed to a certain value t _2R / t ₁ , and the SHG output power P _SHGO 'with respect to temperature is measured, P _SHGO ' (T) = t _2R / T ₁ ηs ² [k (T) m (T) (t ₁ / t _{2 R} · I _LDO −I _th ) −P _th ] ² (10). Therefore, 'so that the condition for changing the LD average drive current, P _SHGconst' constant value _{P SHGc} onst there is SHG output power regardless of the temperature _{T = t 2 (T) /} t 1 · ηs 2 [ k (T) m (T) (t ₁ / t _2R · I _LDO −I _th ) −P _th ] ² = t ₂ (T) / t _2R · P _SHG ′ (11) From the following ( It is given by the equation (12).

T ₂ (T) = t _2R P _SHGconst '/ P _SHGO ' (T) (12) When the LD drive average current is set to a constant value I _LDO by the above equations (11) and (12) The output power P _SHGO 'of the SHG laser light is the temperature T of the LD chip mounting block 15.
It can be seen that changes as shown in FIG.
Further, it can be seen that the application time t ₂ of the LD drive current for _setting the SHG output power to a certain constant value P _SHGconst 'changes as shown in FIG. 8B depending on the temperature T of the LD chip mounting block 15. And (A) of this FIG.
Temperature dependence of the SHG output power when the LD drive average current is set to a constant value I _LDO , obtained from FIG.
By using the relationship between the LD drive current application time and the temperature that _obtains the output power of the SHG laser light to a certain constant value P _SHGconst ′ obtained from the above, once P _SHGO ′ is measured, the detected temperature is detected. Corresponding to P _SHGO ', the operating time is changed so as to be proportional to the reciprocal of P _SHGO '
_Can lead to _SHGconst '.

As described above, this compact integrated SHG green laser can achieve a compact package and low battery power consumption by eliminating the need for a thermoelectric cooler. The laser light generator according to the present invention can be applied to other than the light beam pointer as long as it is a device that does not require strict stability of output power.

[0042]

The laser light generator according to the present invention emits excitation light, a semiconductor laser element, a fundamental wave that is excited by the excitation light to generate a fundamental wave, and emits a laser light whose wavelength is converted to the fundamental wave. In a laser light generator including wavelength conversion means, temperature measuring means for measuring the temperature in a block to which the semiconductor laser element is attached, and the operating point of the semiconductor laser element based on the temperature measured by the temperature measuring means. Operating point temperature estimating means for estimating temperature; storage means for storing in advance output power data of the wavelength converting means for operating point temperature of the semiconductor laser device; and estimated operating temperature from the operating point temperature estimating means. A correction value calculation unit that calculates a correction value of a drive current that drives the semiconductor laser device based on the data from the storage unit; Since a driving means for changing the driving current of the serial semiconductor laser, it can achieve miniaturization and low power consumption.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a small integrated SHG green laser which is an embodiment of the present invention.

FIG. 2 is a block diagram of a SHG output power stabilizing circuit in the small integrated green laser shown in FIG. 1 when the temperature detected in an excitation LD block is not affected by an LD drive current.

FIG. 3 is a characteristic diagram of the power of the pump laser light with respect to the drive current of the pump LD chip.

FIG. 4 is a characteristic diagram showing temperature dependence of energy efficiency.

FIG. 5 is a characteristic diagram showing a relationship among an LD drive current, an SHG output power, and an LD temperature.

FIG. 6 is a block diagram of a SHG output power stabilizing circuit in the compact integrated green laser shown in FIG. 1 when the temperature detected in the pump LD block is affected by the pump LD drive current.

FIG. 7 is a waveform diagram of an intermittent drive current supplied to the excitation LD chip.

FIG. 8 is a characteristic diagram showing the relationship between the LD drive current application time, the SHG output power, and the LD temperature.

FIG. 9 is a configuration diagram of a conventional small integrated green laser.

[Explanation of symbols]

 10 Package 11 Excitation LD Chip 12 Condenser Lens 13 Laser Resonator 13a 1/4 Wave Plate 13b Laser Medium 13c Spacer 13d Nonlinear Crystal Element 14 Temperature Sensor 15 LD Chip Mounting Block 21 Operating Point Temperature Estimating Circuit 22 SHG Temperature Dependence of Output Power Property table 23 LD drive current correction value calculation circuit 24 LD drive current reference value supply circuit 25 LD drive circuit

Claims (5)

[Claims] 1. A semiconductor laser device for emitting excitation light,
A laser light generator comprising: a wavelength conversion unit that is excited by the excitation light to generate a fundamental wave and emits a laser beam obtained by wavelength-converting the fundamental wave, in a block to which the semiconductor laser element is attached. Temperature measuring means for measuring the temperature of the semiconductor laser element, operating point temperature estimating means for estimating the operating point temperature of the semiconductor laser element from the measured temperature of the temperature measuring means, and wavelength conversion means for the operating point temperature of the semiconductor laser element. Correction value calculation for calculating the correction value of the drive current for driving the semiconductor laser device based on the storage unit that stores the output power data in advance, the estimated operating temperature from the operating point temperature estimation unit, and the data from the storage unit. Means for driving the semiconductor laser according to the correction value of the correction value calculating means, and a driving means for changing the drive current of the semiconductor laser. Generating device. 2. The wavelength conversion means includes a quarter wavelength plate,
2. The laser light generator according to claim 1, wherein the laser light generator is constituted by a resonator having a laser medium and a nonlinear optical crystal element. 3. The laser light generator according to claim 1, wherein the drive means changes and supplies a continuous drive current to the semiconductor laser element according to the correction value. 4. The laser light generator according to claim 1, wherein the drive means changes and supplies an intermittent drive current to the semiconductor laser element according to the correction value. 5. The laser light generator according to claim 1, wherein the wavelength conversion means stabilizes the wavelength-converted laser light within an allowable range according to the purpose of use.