CN104950432B - Mechanical laser power damped system and its structure - Google Patents

Abstract

The invention relates to the technical field of laser power attenuation, and discloses a mechanical laser power attenuation method and its structure. The method is as follows: a rotating disk is arranged on the transmission optical path of the laser beam, and a blocking block for blocking the passage of the laser beam is formed on the rotating disk. area and an empty window area for the laser beam to pass through, and the blocking area and the empty window area are arranged alternately around the rotation center of the rotating disk; the power of the attenuated laser beam P=P ₁ ×(1‑S ₁ /S ), where P ₁ is the power of the laser beam before attenuation, S ₁ is the area of the blocking area, and S is the area of the rotating disk. Using the mechanical laser power attenuation method of the present invention to attenuate the laser beam, because it uses a rotating disk, and by setting a blocking area and an empty window area on the rotating disk, the laser beam passes through the rotating disk intermittently, and reaches For the attenuation effect of the laser beam power, it does not need to use optical lenses, has a simple structure, low cost, is not affected by the wavelength and polarization state of the laser beam, and has a wide range of applications.

Description

Mechanical laser power attenuation method and its structure

technical field

The invention relates to the technical field of laser power attenuation structures, in particular to a mechanical laser power attenuation method and its structure.

Background technique

With the development of laser technology, the power of laser has been significantly increased, and very high requirements have been put forward for the measurement equipment of laser beam of high-power laser. For example, to measure the laser power parameters of high-power lasers, a high-power laser power meter is required, and the price of such equipment is very expensive, and the probe of the power meter is very easy to be damaged by long-term high-power measurement.

In view of the above problems, attenuating the laser beam according to a certain ratio and measuring the attenuated laser beam has become a better choice for laser beam measurement of high-power lasers; by using the attenuation method to attenuate the laser beam, the requirements for its measurement equipment are also greatly reduced. Avoid damage to the probes of measuring equipment such as high-power laser power meters, and can also effectively protect the measuring equipment.

The attenuation method in the prior art uses optical lenses to attenuate the laser beam, which can be divided into absorption attenuation and reflective attenuation, that is, the optical lens absorbs the laser beam or reflects the laser beam. The method of using optical lenses to attenuate the laser beam has the following defects: first, the optical lens is limited by the wavelength and polarization state of the laser beam, so it is difficult to apply to a wide range of laser beams, and its application range is limited; secondly, the general cost of optical lenses is very high. high.

Contents of the invention

The purpose of the present invention is to provide a mechanical laser power attenuation method, aiming to solve the problems of limited application range and high cost in the prior art, where optical lenses are used to attenuate the power of laser beams.

The present invention is achieved in this way. In the mechanical laser power attenuation method, a rotatable rotating disk is arranged on the transmission optical path of the laser beam, and a blocking area for blocking the passage of the laser beam and a space for the passage of the laser beam are formed on it. a window area, and the blocking area and the empty window area alternate with each other and are arranged around the rotation center of the rotating disk;

The power of the attenuated laser beam P=P ₁ ×(1-S ₁ /S), where P ₁ is the power of the unattenuated laser beam, S ₁ is the area of the blocking area, and S is the area of the rotating disk.

The present invention also provides a mechanical laser power attenuation structure, which includes a rotatable rotating disk placed in the transmission path of the laser beam, on which there are blocking areas for blocking the passage of the laser beam and holes for the passage of the laser beam. In the empty window area, the blocking area and the empty window area alternate with each other and are arranged around the rotation center of the rotating disk.

Compared with the prior art, using the mechanical laser power attenuation method of the present invention to attenuate the laser beam, because it uses a rotating disk, and by setting a blocking area and an empty window area on the rotating disk, the laser beam is interrupted It passes through the rotating disk and achieves the effect of attenuating the power of the laser beam. It does not need to use optical lenses, has a simple structure, low cost, and is not affected by the wavelength and polarization state of the laser beam. It has a wide range of applications.

Description of drawings

Fig. 1 is a schematic front view of a mechanical laser power attenuation structure provided by an embodiment of the present invention;

Fig. 2 is a schematic perspective view of a mechanical laser power attenuation structure provided by an embodiment of the present invention in a working state.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The implementation of the present invention will be described in detail below in conjunction with specific embodiments.

As shown in Figures 1-2, it is a preferred embodiment provided by the present invention.

The mechanical laser power attenuation method provided in this embodiment is used to attenuate the laser beam 2 emitted by the laser 3 according to a certain ratio, so that the high-power laser beam 2 forms a low-power laser beam, so that it is convenient to use a power meter, etc. The measuring equipment measures the attenuated laser beam, avoids damage to the probe in the power meter, and can effectively protect the power meter.

The above mechanical laser power attenuation method is as follows:

A rotatable rotating disc 1 is arranged on the transmission optical path of the laser beam 2, and the rotating disc 1 and the transmission optical path of the laser beam 2 are arranged at an angle, and a blocking area 12 for blocking the passage of the laser beam 2 is formed on it. The laser beam 2 passes through the empty window area 11 , and the blocking area 12 and the empty window area 11 alternate with each other and are arranged around the rotation center of the rotating disk 1 .

A blocking area 12 and an empty window area 11 are formed in the rotating disk 1, the blocking area 12 is used to block the laser beam 2 from passing through the rotating disk 1, and the empty window area 11 can allow the laser beam 2 to pass through the rotating disk 1, And the blocking area 12 and the empty window area 11 are arranged alternately, and are arranged around the rotation center of the rotating disk, so that when the rotating disk 1 is rotating, the laser beam 2 is between the blocked state and the passing state. alternate with each other;

The rotating disk 1 rotates at a fixed speed, wherein the frequency F of the rotating disk 1 blocking the laser is equal to the frequency f of the rotating disk 1 multiplied by the number n of blocking regions 12 in the rotating disk 1, that is, F=f×n ;

The power ratio R of the laser beam attenuated by the rotating disk 1 is equal to the area S ₁ of the blocking area 12 divided by the area S of the rotating disk 1, that is, R=S ₁ /S;

In this way, the power P of the laser beam attenuated by the rotating disk 1 is then:

P=P ₁ ×(1-R), ie P=P ₁ ×(1-S ₁ /S), wherein P ₁ is the total power of the unattenuated laser beam 2 .

In this way, by changing the area of the blocking area 12 on the rotating disk 1, the attenuation ratio of the rotating disk 1 can be changed.

The rotating disk 1 mentioned above is a circular disk, and the blocking area 12 and the window area 11 are fan-shaped areas respectively formed on the rotating disk 1 . Certainly, as other embodiments, the rotating disk 1 may also be in other shapes such as a square.

In order to realize the multi-layer attenuation of the laser beam 2, a plurality of the above-mentioned rotating disks 1 are arranged in the transmission optical path of the laser beam 2, and the plurality of rotating disks 1 are arranged in parallel with each other. Attenuation, of course, the power of the attenuated laser beam is: P=P ₁ ×(1-S ₁ /S) ^m , where m is the number of rotating disks 1 .

The blocking area of the above-mentioned rotating disk can use reflection to block the laser beam irradiated on it. At this time, the rotating disk and the transmission optical path of the laser beam are arranged at an angle; At this time, the rotating disk 1 may not be arranged at an angle with the transmission optical path of the laser beam 2, and may also be arranged in a vertical shape. At this time, under the action of the light-absorbing layer, the laser beam irradiated on it may Beam 2 absorbs.

Or, as another embodiment, a one-way light blocker can be set in front of the blocking area 12 of the rotating disk 1, and the one-way light blocker is arranged in the transmission path of the laser beam 2, and the laser beam 2 emitted by the laser 3 It can pass through the one-way light blocker and be incident on the rotating disk 1; of course, at this time, the rotating disk 1 can be perpendicular to the transmission optical path of the laser beam 2, and the laser reflected back by the rotating disk 1 can be blocked in one direction. Under the barrier of the laser, it will not shoot back to the laser.

Alternatively, a plurality of strip grooves may be provided on the surface of the blocking region 12, the strip grooves have openings formed on the surface of the blocking region 12, and the bottom extends obliquely toward the inside of the blocking region 12, when the laser beam 2 After being irradiated on the surface of the blocking area 12, the laser beam 2 directly enters the interior of the strip groove through the opening of the strip groove, and forms multiple emission inside it, and is confined in the strip groove , In this way, the effect of blocking the laser beam 2 is achieved, and the laser beam 2 is prevented from being directly reflected back to the laser. Therefore, when strip-shaped grooves are provided in the blocking area 12 , the rotating disk 1 can also be arranged perpendicularly to the transmission optical path of the laser beam 2 , or arranged at an included angle.

Using the mechanical laser power attenuation method provided above, the laser beam 2 emitted by the laser 3 is attenuated. It uses a mechanical device and does not need to use optical lenses, so it will not be affected by the wavelength and polarization state of the laser beam 2. Wide application range and low cost.

According to the above-mentioned mechanical laser power attenuation method, this embodiment provides a mechanical laser power attenuation structure, which includes a rotating disk 1, and the rotating disk 1 is arranged on the transmission optical path of the laser beam 2 of the laser 3, and is clamped with the laser beam 2. Angle oblique arrangement, like this, avoid its reflection to laser, affect laser 3, and this rotating disk 1 rotates with its disk center as the rotation point.

In the above-mentioned laser power attenuation structure, the power of the laser beam 2 is attenuated by setting the rotating disk 1 that is constantly rotating, without using optical lenses. Zone 11 is OK, and the power of the attenuated laser beam can be calculated through the above formula, and the whole process is completely completed by mechanical devices, so it can also be defined as a mechanical laser power attenuation structure.

The mechanical laser power attenuation structure is not limited by the wavelength and polarization state of the laser beam 2 emitted by the laser 3, and can be compatible with laser beams 2 of different wavelengths and different polarization states. It has a wide range of applications, and has a simple structure and low cost.

The rotating disk 1 is arranged at a certain angle on the transmission optical path of the laser beam 2. Of course, for the convenience of design, in general, the rotating disk 1 and the transmission optical path of the laser beam 2 are arranged at an angle of 45°.

The above-mentioned blocking area 12 blocks the laser beam 2 in a reflective manner. Of course, as other embodiments, a light-absorbing layer can also be coated on the surface of the blocking area 12, and the light-absorbing layer can absorb the radiation in the blocking area. The laser beam 2 on 12 also plays the effect of blocking the laser beam 2. Moreover, when the light-absorbing layer is set on the blocking area 12, at this time, the rotating disk 1 may not be arranged at an angle with the transmission optical path of the laser beam 2, and may also be arranged in a vertical shape. At this time, in the light-absorbing layer Under the action, the laser beam 2 irradiated on it can be absorbed.

Or, as another embodiment, a plurality of strip-shaped grooves may be arranged on the surface of the blocking region 12, the strip-shaped grooves have openings formed on the surface of the blocking region 12, and the bottoms face into the blocking region 12. Extending obliquely, when the laser beam 2 is irradiated on the surface of the blocking area 12, the laser beam 2 directly enters the inside of the bar-shaped groove through the opening of the bar-shaped groove, and forms multiple emissions inside it, and is limited In the strip groove, in this way, the effect of blocking the laser beam 2 is achieved, and the laser beam 2 is prevented from being directly reflected back to the laser. Therefore, when strip-shaped grooves are provided in the blocking area 12 , the rotating disk 1 can also be arranged perpendicularly to the transmission optical path of the laser beam 2 , or arranged at an included angle.

Or, a one-way light blocker can be set in front of the blocking area 12 of the rotating disk 1, and the one-way light blocker is arranged in the transmission path of the laser beam 2, and the laser beam 2 emitted by the laser 3 can pass through the one-way light blocker. The optical device is incident on the rotating disk 1; of course, the rotating disk 1 at this time can be perpendicular to the transmission optical path of the laser beam 2, and the laser reflected back through the rotating disk 1 is blocked by the one-way light blocker. will shoot back to the laser.

The rotating disk 1 is a disk, and it takes the center of the disk as the center of rotation, wherein the blocking area 12 and the empty window area 11 are fan-shaped areas formed in the disk, so that the regularly shaped blocking area 12 and the empty window The area 11 is provided to facilitate the manufacture of the rotating disk 1 , of course, the specific area can be designed according to the ratio of attenuation of the laser beam 2 .

In this embodiment, a plurality of blocking areas 12 and a plurality of window areas 11 are formed on the rotating disc 1, and the blocking areas 12 and the window areas 11 on the rotating disc 1 are arranged alternately. The blocking area 12 and the plurality of empty window areas 11 can make the laser switch more frequently between the blocked state and the passing state, and can avoid a large fluctuation effect on the power of the laser beam 2 . Of course, as the rotation speed of the rotating disk 1 increases, the influence of the rotating disk 1 on the power fluctuation of the laser beam 2 can also be reduced.

In this embodiment, the areas of the blocking regions 12 are equal, the comparative shapes are also consistent, and they are evenly distributed alternately, which greatly facilitates the manufacture of the rotating disk 1 .

Of course, in order to attenuate the laser beam 2 in multiple layers, the mechanical laser power attenuation structure includes a plurality of the above-mentioned rotating discs 1, and the plurality of rotating discs 1 are arranged in parallel and alternately in the transmission optical path of the laser beam 2. The plurality of attenuators The power of the laser beam 2 is sequentially attenuated and arranged in parallel with each other. Of course, the plurality of rotating disks 1 can not be arranged non-parallel, as long as they are inclined and not perpendicular to the transmission optical path of the laser beam 2 .

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (6)

1. mechanical laser power damped system, it is characterised in that for the laser beam that is emitted to laser according to one Certainty ratio is decayed, and rotatable rotating disc is set in the transmission light path of laser beam, thereon formed with for blocking laser The Kong Chuan areas that the blocking area and confession laser beam that light beam passes through pass through, and the blocking area alternates and surround with Kong Chuan areas The center of rotation arrangement of the rotating disc；The rotating disc is disk, and it is using disc centre as center of rotation, and according to fixed Rotational speed, the blocking area and the Kong Chuan areas are respectively the sector region being formed on the disk；The blocking area face Product is equal, shape is consistent, and uniformly distributes alternately；The blocking area is provided with multiple strip grooves, and the strip groove has The opening being formed on the blocking area surface, its bottom are radiated at the strip groove towards inclination extension in the blocking area On laser beam, in multiple reflections in the strip groove, and be restricted in the strip groove；Before the rotating disc Side sets unidirectional light trap, and the unidirectional light trap is arranged in the transmission light path of laser beam, and what the laser was sent swashs Light light beam may pass through unidirectional light trap；The perpendicular shape of transmission light path of the rotating disc and laser beam, the unidirectional light trap The laser that reflects of the barrier rotating disc,

Power P=P of laser beam after decay₁×(1-S₁/ S), wherein, P₁For the power for laser beam before decay, S₁For The area in area is blocked, S is the area of rotating disc.

2. mechanical laser power damped system as claimed in claim 1, it is characterised in that the rotating disc and the laser The transmission light path of light beam is arranged in angle.

3. the mechanical laser power damped system as described in any one of claim 1 to 2, it is characterised in that in the laser Be provided with the rotating disc of multiple alternate parallel arrangements in the transmission light path of light beam, and by multiple rotating discs decay after The power of laser beam be P=P₁×(1-S₁/S)^m, wherein, m is the number of rotating disc.

4. mechanical laser power attenuating structure, the laser beam for being emitted to laser declines according to a certain percentage Subtract, it is characterised in that including being placed in the transmission light path of laser beam and rotatable rotating disc, which is provided with sharp for blocking The Kong Chuan areas that the blocking area and confession laser beam that light light beam passes through pass through, the blocking area alternate and surround with Kong Chuan areas The center of rotation arrangement of the rotating disc；The rotating disc is disk, and it is using disc centre as center of rotation, and according to fixation Rotational speed, it is described that to block area and the Kong Chuan areas be respectively the sector region being formed on the disk；The blocking area Area equation, shape are consistent, and uniformly distribute alternately；The blocking area is provided with multiple strip grooves, the strip groove tool There is the opening being formed on the blocking area surface, its bottom extends towards inclination in the blocking area；The front of the rotating disc Unidirectional light trap is set, and the unidirectional light trap is arranged in the transmission light path of laser beam, the laser that the laser is sent Light beam may pass through unidirectional light trap；The perpendicular shape of transmission light path of the rotating disc and laser beam, the unidirectional light trap Obstruct the laser that the rotating disc reflects.

5. mechanical laser power attenuating structure as claimed in claim 4, it is characterised in that the rotating disc and the laser The transmission light path of light beam is arranged in angle.

6. the mechanical laser power attenuating structure as described in any one of claim 4 to 5, it is characterised in that the rotating disc To be multiple, and multiple rotating disc difference interphase distributions.