CN204012175U - Visible ray super continuum source based on green-light fiber laser pumping - Google Patents
Visible ray super continuum source based on green-light fiber laser pumping Download PDFInfo
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- CN204012175U CN204012175U CN201420248138.9U CN201420248138U CN204012175U CN 204012175 U CN204012175 U CN 204012175U CN 201420248138 U CN201420248138 U CN 201420248138U CN 204012175 U CN204012175 U CN 204012175U
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- 238000005086 pumping Methods 0.000 title claims description 13
- 239000013307 optical fiber Substances 0.000 claims abstract description 126
- 239000004038 photonic crystal Substances 0.000 claims abstract description 43
- 230000010287 polarization Effects 0.000 claims description 42
- 230000005540 biological transmission Effects 0.000 claims description 30
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Abstract
本实用新型涉及光纤技术领域，尤其涉及一种基于绿光光纤激光器泵浦的可见光超连续谱光源。本实用新型通过基于Grin光纤耦合技术或空间耦合套件的全光纤化绿光光纤激光器泵浦光子晶体光纤，产生光谱能量主要集中在可见光波段的超连续谱光源。本装置可以实现纯可见光波段的高功率全光纤化超连续谱光源，可以更好地满足可见光超连续谱应用领域的需求。
The utility model relates to the field of optical fiber technology, in particular to a visible light supercontinuum light source pumped by a green optical fiber laser. The utility model pumps a photonic crystal fiber through an all-fiber green fiber laser based on Grin fiber coupling technology or a space coupling kit to generate a supercontinuum light source whose spectral energy is mainly concentrated in the visible light band. The device can realize a high-power all-fiber supercontinuum light source in the pure visible light band, and can better meet the needs of the visible light supercontinuum application field.
Description
Technical field
The utility model relates to optical fiber technology field, relates in particular to a kind of visible ray super continuum source based on green-light fiber laser pumping.
Background technology
Optical fiber super continuum source can produce high brightness, high relevant broadband light, be equivalent to wideband laser, in fields such as biomedicine, laser spectroscopy, environmental monitoring, remote sensings, have important application prospect, particularly the super continuous spectrums of visible light wave range has in fields such as cytology, biomedical imaging, biological spectrum analyses the using value can not be substituted.Yet, the mainstream technology of current generation super continuous spectrums is to utilize ripe 1 μ m, 1.5 μ m or 2 μ m optical-fiber laser pumpings and realize, cause exporting the infrared band of most of concentration of energy more than 800nm in super continuous spectrums, very low to the energy conversion efficiency of pure visible light wave range.As the 10W super continuum source of famous super continuum source supplier Britain Fianium company, at visible light wave range, only there is the power of 1.2W.The well-known super continuous spectrums supplier of another family Denmark NKT company has developed the super continuum source that visible ray strengthens, improved the transformation efficiency of visible light wave range, but nonetheless, power output is that 8W super continuum source also only has the power output of 2W at visible light wave range, but also need to use the spectral beam-splitter of joining in it just visible light wave range spectral separation can be exported.Conventional super continuum source, at visible light wave range low transformation efficiency and power utilization like this, has greatly limited the application of visible ray super continuous spectrums.
Utility model content
Technical problem to be solved in the utility model is: too low at visible light wave range proportion for super continuum source spectral energy in prior art, thereby limited the deficiency of the application of visible ray super continuous spectrums, the utility model is intended providing a kind of visible ray super continuum source based on green-light fiber laser pumping, makes spectral energy mainly concentrate on visible light wave range.The utility model is achieved in that
A visible ray super continuum source based on green-light fiber laser pumping, comprises the green-light fiber laser, photonic crystal fiber, the first optical fiber end cap that connect successively;
Described green-light fiber laser is for generation of green laser, thereby as photonic crystal fiber described in pumping, makes the pump light of described photonic crystal fiber output super continuous spectrums;
Described the first optical fiber end cap is for avoiding the end face reflection of described photonic crystal fiber;
Described green-light fiber laser comprises connection successively:
Linear polarization narrow cable and wide optical fiber laser, for generation of fundamental frequency light;
Polarization relationship type fibre optic isolater, for preventing that described fundamental frequency light from feeding back to described linear polarization narrow cable and wide optical fiber laser;
Full optical fiber laser frequency multiplier, for the fundamental frequency light of described polarization relationship type fibre optic isolater output is carried out to frequency multiplication, produces green double-frequency laser;
Described full optical fiber laser frequency multiplier is any one in following two kinds of structures:
Structure 1: described full optical fiber laser frequency multiplier comprises successively and to connect:
Laser frequency multiplier input optical fibre, for receiving the fundamental frequency light of described polarization relationship type fibre optic isolater output;
The first coreless fiber, expands transmission for the fundamental frequency light to through described laser frequency multiplier input optical fibre input;
The one Grin optical fiber, for collimating and focus on the fundamental frequency light of inputting after described the first coreless fiber expands transmission;
The second coreless fiber, focuses on transmission for the fundamental frequency light to through a described Grin fiber optic collimator and after focusing on;
Frequency-doubling crystal, for the fundamental frequency light of input after described the second coreless fiber focuses on transmission is carried out to frequency multiplication, produces green double-frequency laser;
The 3rd coreless fiber, expands transmission for the green double-frequency laser that described frequency-doubling crystal is produced;
The 2nd Grin optical fiber, for collimating and focus on the green double-frequency laser of inputting after described the 3rd coreless fiber expands transmission;
The 4th coreless fiber, focuses on transmission for the green double-frequency laser to through described the 2nd Grin fiber optic collimator and after focusing on;
Laser frequency multiplier output optical fibre, for exporting the green double-frequency laser of input after described the 4th coreless fiber focuses on transmission, as the pump light of photonic crystal fiber described in pumping;
Structure 2: described full optical fiber laser frequency multiplier comprises successively and to connect:
Laser frequency multiplier input optical fibre, for receiving the fundamental frequency light of described polarization relationship type fibre optic isolater output;
The second optical fiber end cap, expands transmission for the fundamental frequency light to through described laser frequency multiplier input optical fibre input, and avoids end face reflection;
The first laser alignment lens, for collimating to the fundamental frequency light of inputting after described the second optical fiber end cap expands transmission;
The first laser focusing lens, focuses on for the fundamental frequency light to after described the first laser alignment collimated;
Frequency-doubling crystal, carries out frequency multiplication for the fundamental frequency light to after described the first laser focusing lens focuses on, and produces green double-frequency laser;
The second laser alignment lens, collimate for the green double-frequency laser that described frequency-doubling crystal is produced;
The second laser focusing lens, focuses on for the green double-frequency laser to after described the second laser alignment collimated;
The 3rd optical fiber end cap, for avoiding end face reflection, and the green double-frequency laser of output after described the second laser focusing lens focuses on;
Laser frequency multiplier output optical fibre, for exporting the green double-frequency laser through described the 3rd optical fiber end cap input;
In above-mentioned two kinds of structures:
The output of described polarization relationship type fibre optic isolater is connected with described laser frequency multiplier input optical fibre;
Described laser frequency multiplier output optical fibre is connected with described photonic crystal fiber.
Further, described laser frequency multiplier output optical fibre is that cut-off wavelength is lower than the single-mode polarization maintaining fiber of 0.5 μ m.
Further, the pulsewidth of described linear polarization narrow cable and wide optical fiber laser is not more than 10 psecs;
Described photonic crystal fiber is the quartzy photonic crystal fiber of non-taper or the quartzy photonic crystal fiber of taper;
The zero-dispersion wavelength of the quartzy photonic crystal fiber of described non-taper is positioned near infrared band;
The zero-dispersion wavelength of the quartzy photonic crystal fiber of described taper is reduced to gradually green light band near infrared band in its conical transition zone, approaches but is less than the output wavelength of described green-light fiber laser.
Further, the pulsewidth of described linear polarization narrow cable and wide optical fiber laser is greater than 10 psecs;
Described photonic crystal fiber is the quartzy photonic crystal fiber of taper;
The zero-dispersion wavelength of the quartzy photonic crystal fiber of described taper is reduced to gradually green light band near infrared band in its conical transition zone, approaches but is less than the output wavelength of described green-light fiber laser.
Further, described linear polarization narrow cable and wide optical fiber laser is that operation wavelength is the Yb-doped fiber laser of 1 μ m.
Further, the optical fiber of the output of described linear polarization narrow cable and wide optical fiber laser, the input of described polarization relationship type fibre optic isolater and the optical fiber of output and described laser frequency multiplier input optical fibre are the polarization maintaining optical fibre that parameter is identical.
Compared with prior art, the utility model produces pump light by the green-light fiber laser of full fiberize, by Grin fiber coupling technique or Lens Coupling technology, make the spectral energy of super continuum source mainly concentrate on visible light wave range, can make laser greatly improve at the power of visible light wave range at the super continuum source of current power output with conditions, thereby can realize visible ray super continuous spectrums application widely.
Accompanying drawing explanation
The structural representation of the visible ray super continuum source based on green-light fiber laser pumping that Fig. 1: the utility model embodiment 1 provides;
Fig. 2: the structural representation of the visible ray super continuum source of the another kind that the utility model embodiment 2 provides based on green-light fiber laser pumping.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only for explaining the utility model, and be not used in restriction the utility model.
Fig. 1 and Fig. 2 show the structure of the visible ray super continuum source (hereinafter to be referred as light source) based on green-light fiber laser pumping of two kinds of structures.Shown in Fig. 1 and Fig. 2, the light source of two kinds of structures includes green-light fiber laser 1, photonic crystal fiber 2 and the first optical fiber end cap 3 connecting successively.Wherein, green-light fiber laser 1 is for generation of green glow, as the pump light of pump photon crystal fiber 2.The first optical fiber end cap 3, for avoiding the end face reflection of photonic crystal fiber 2, can not be reflected back in green-light fiber laser 1 because of the reflection of its end face the laser of exporting by photonic crystal fiber 2, thereby protection green-light fiber laser 1 is avoided damage.
In said structure, green-light fiber laser 1 comprises linear polarization narrow cable and wide optical fiber laser 11, polarization relationship type fibre optic isolater 12, the full optical fiber laser frequency multiplier 14 connecting successively.Wherein, linear polarization narrow cable and wide optical fiber laser 11 is for generation of fundamental frequency light.The fundamental frequency light one-way transmission of polarization relationship type fibre optic isolater 12 for guaranteeing to produce, prevents from that it from feeding back in linear polarization narrow cable and wide optical fiber laser 1 system is caused to damage.Full optical fiber laser frequency multiplier 14 carries out frequency multiplication for the fundamental frequency light that polarization relationship type fibre optic isolater 12 is exported, thereby produces above-mentioned green glow.
According to the wave-length coverage of green glow, in the present embodiment, linear polarization narrow cable and wide optical fiber laser preferably adopts operation wavelength at the Yb-doped fiber laser of 1 mu m waveband, Yb-doped fiber laser has gain bandwidth, tunable range is wide, can obtain high-gain and high-energy conversion efficiency, it exports 1 μ m linear polarization narrow-linewidth laser as fundamental frequency light.This fundamental frequency light enters frequency multiplication in full optical fiber laser frequency multiplier 14 through polarization relationship type fibre optic isolater 12, thereby obtain wavelength, is the green glow of 0.5 μ m.The input of the optical fiber of the output of linear polarization narrow cable and wide optical fiber laser 11, polarization relationship type fibre optic isolater 12 and the optical fiber of output are the polarization maintaining optical fibre that parameter is identical.
The difference of the light source of above-mentioned two kinds of structures is, the structure difference of full optical fiber laser frequency multiplier 14.
As shown in Figure 1, wherein, in a kind of light source of structure, full optical fiber laser frequency multiplier 14 comprises laser frequency multiplier input optical fibre 1401, the first coreless fiber 1402, a Grin optical fiber 1403, the second coreless fiber 1404, frequency-doubling crystal 1405, the 3rd coreless fiber 1406, the 2nd Grin optical fiber 1407, the 4th coreless fiber 1408, the laser frequency multiplier output optical fibre 1409 connecting successively.Wherein, laser frequency multiplier input optical fibre 1401 is for receiving the fundamental frequency light of polarization relationship type fibre optic isolater 12 outputs.Laser frequency multiplier input optical fibre 1401, the first coreless fiber 1402 and Grin optical fiber 1403 threes' combination is equivalent to the free space of space-focusing lens and front and back thereof, and it utilizes self focusing principle by fundamental frequency optical alignment and focuses on frequency-doubling crystal 1405 centers.Particularly, the first coreless fiber 1402 expands transmission for the fundamental frequency light to through 1401 inputs of laser frequency multiplier input optical fibre, reaches larger spot diameter while making it enter a Grin optical fiber 1403.So-called expand transmission refer to: the first coreless fiber 1402 is equivalent to the free space before space-focusing lens, the fundamental frequency light that laser frequency multiplier input optical fibre 1401 receives enters after the first coreless fiber 1402, transmission in the first coreless fiber 1402, in transmitting procedure, the light beam of fundamental frequency light is dispersed gradually, thereby plays the effect of expanding.The length of the first coreless fiber 1402 can calculate according to actual needs.Fundamental frequency light expands after transmission through the first coreless fiber 1402, enters a Grin optical fiber 1403.The one Grin optical fiber 1403 is for collimating and focus on the fundamental frequency light of inputting after the first coreless fiber 1402 expands transmission.The second coreless fiber 1404 focuses on transmission for the fundamental frequency light to through Grin optical fiber 1403 collimations and after focusing on, and its center at frequency-doubling crystal 1405 is focused on becomes minimum waist spot.So-called focusing transmission refers to: the second coreless fiber 1404 is equivalent to the free space after space-focusing lens.Fundamental frequency light after the one Grin optical fiber 1403 collimations and focusing enters after the second coreless fiber 1404, transmission in the second coreless fiber 1404, and in transmitting procedure, the light beam of fundamental frequency light draws in gradually, thereby plays the effect of focusing.The length of the second coreless fiber 1404 can calculate according to actual needs.Fundamental frequency light focuses on after transmission through the second coreless fiber 1404, enters frequency-doubling crystal 1405.Thereby frequency-doubling crystal 1405 produces green double-frequency laser for the fundamental frequency light of input after the second coreless fiber 1404 focuses on transmission is carried out to frequency multiplication.With in like manner aforementioned, the 3rd coreless fiber 1406, the 2nd Grin optical fiber 1407 and the 4th coreless fiber 1408 are equivalent to the free space of space-focusing lens and front and back thereof, and it utilizes self focusing principle by 0.5 μ m double-frequency laser collimation and focus on and enters in the fibre core of laser frequency multiplier output optical fibre 1409.Particularly, the 3rd coreless fiber 1406 expands transmission for the green double-frequency laser that frequency-doubling crystal 1405 is produced, and reaches larger spot diameter while making it enter the 2nd Grin optical fiber 1407.The 2nd Grin optical fiber 1407 is for collimating and focus on the green double-frequency laser of inputting after the 3rd coreless fiber 1406 expands transmission.The 4th coreless fiber 1408 focuses on transmission for the double-frequency laser to through the 2nd Grin optical fiber 1407 collimations and after focusing on, and enters laser frequency multiplier output optical fibre 1409.Laser frequency multiplier output optical fibre 1409 is for exporting the green double-frequency laser of input after the 4th coreless fiber 1408 focuses on transmission, as the pump light of pump photon crystal fiber 2.
As shown in Figure 2, in the light source of another kind of structure, full optical fiber laser frequency multiplier 14 comprises laser frequency multiplier input optical fibre 1401, the second optical fiber end cap 1410, the first laser alignment lens 1411, the first laser focusing lens 1412, frequency-doubling crystal 1405, the second laser alignment lens 1413, the second laser focusing lens 1414, the 3rd optical fiber end cap 1415, the laser frequency multiplier output optical fibre 1409 connecting successively.Wherein, laser frequency multiplier input optical fibre 1401 is for receiving the fundamental frequency light of polarization relationship type fibre optic isolater 12 outputs.The second optical fiber end cap 1410 expands transmission for the fundamental frequency light to through 1401 inputs of laser frequency multiplier input optical fibre, avoid the damage of high power laser light to output end face, meanwhile, avoid fundamental frequency light to return its backing system through end face reflection, backing system is caused to damage.The first laser alignment lens 1411 are for collimating to the fundamental frequency light of inputting after the second optical fiber end cap 1410 expands transmission.The first laser focusing lens 1412 focuses on for the fundamental frequency light to after the first laser alignment lens 1411 collimations, and its center at frequency-doubling crystal 1405 is focused on becomes minimum waist spot.Frequency-doubling crystal 1405 carries out frequency multiplication for the fundamental frequency light to after the first laser focusing lens 1412 focuses on, and produces green double-frequency laser.The second laser alignment lens 1413 collimate for the green double-frequency laser that frequency-doubling crystal 1405 is produced.The second laser focusing lens 1414 focuses on for the green double-frequency laser to after the second laser alignment lens 1413 collimations.Thereby the 3rd optical fiber end cap 1415 is for avoiding end face reflection to cause damage to its backing system, and the green double-frequency laser after focusing enters laser frequency multiplier output optical fibre 1409.Laser frequency multiplier output optical fibre 1409 is for exporting the green double-frequency laser through the 3rd optical fiber end cap 1415 inputs, as the pump light of pump photon crystal fiber 2.In this kind of structure, full optical fiber laser frequency multiplier 14 also comprises a fixture 1416, for fixing the second optical fiber end cap 1410, the first laser alignment lens 1411, the first laser focusing lens 1412, frequency-doubling crystal 1405, the second laser alignment lens 1413, the second laser focusing lens 1414 and the 3rd optical fiber end cap 1415.
In the light source of above two kinds of structures, the light path of laser is shown in dotted line.The output of polarization relationship type fibre optic isolater 12 is connected with laser frequency multiplier input optical fibre 1401, and laser frequency multiplier output optical fibre 1409 is connected with photonic crystal fiber 2.Laser frequency multiplier input optical fibre 1401 is the polarization maintaining optical fibre identical with the optical fiber of the output of linear polarization narrow cable and wide optical fiber laser 11 and the input of polarization relationship type fibre optic isolater 12 and the optical fiber parameter of output.Laser frequency multiplier output optical fibre 1409 is that cut-off wavelength is lower than the single-mode polarization maintaining fiber of 0.5 μ m.
Photonic crystal fiber 2 can adopt the quartzy photonic crystal fiber of non-taper or the quartzy photonic crystal fiber of taper.The zero-dispersion wavelength of the quartzy photonic crystal fiber of non-taper is positioned near infrared band.The zero-dispersion wavelength of the quartzy photonic crystal fiber of taper is reduced to gradually green light band near infrared band in its conical transition zone, approaches but is less than the output wavelength of green-light fiber laser 1.If linear polarization narrow cable and wide optical fiber laser 11 selects pulsewidth to be not more than the ultrashort pulse fiber laser of 10 psecs, photonic crystal fiber 2 both can adopt the quartzy photonic crystal fiber of non-taper, produce the mainly visible ray super continuous spectrums based on from phase modulator non-linearities optical effect, can, also to adopt the quartzy photonic crystal fiber of taper, produce the mainly visible ray super continuous spectrums based on nonlinear optical effects such as modulational instability, Cross-phase Modulation, four wave mixing, orphan's self-frequency shift, orphan catch.If linear polarization narrow cable and wide optical fiber laser 11 selects pulsewidth to be greater than long pulse fiber laser or the continuous wave fiber laser of 10 psecs, photonic crystal fiber needs to adopt the quartzy photonic crystal fiber of taper, produces the mainly visible ray super continuous spectrums based on nonlinear optical effects such as modulational instability, orphan's self-frequency shift, orphan catch.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104009378A (en) * | 2014-05-15 | 2014-08-27 | 深圳大学 | Visible light super-continuum spectrum light source based on green-light fiber laser pumping |
| WO2015172699A1 (en) * | 2014-05-14 | 2015-11-19 | 深圳大学 | All-fibre laser mixer and mixing optical fibre laser thereof |
| CN105449501A (en) * | 2015-12-29 | 2016-03-30 | 中国电子科技集团公司第十一研究所 | Fiber laser |
-
2014
- 2014-05-15 CN CN201420248138.9U patent/CN204012175U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015172699A1 (en) * | 2014-05-14 | 2015-11-19 | 深圳大学 | All-fibre laser mixer and mixing optical fibre laser thereof |
| CN104009378A (en) * | 2014-05-15 | 2014-08-27 | 深圳大学 | Visible light super-continuum spectrum light source based on green-light fiber laser pumping |
| WO2015172700A1 (en) * | 2014-05-15 | 2015-11-19 | 深圳大学 | Visible light super-continuum spectrum light source based on green-light fiber laser pumping |
| CN104009378B (en) * | 2014-05-15 | 2017-03-29 | 深圳大学 | A kind of visible ray super continuum source based on green-light fiber laser pumping |
| CN105449501A (en) * | 2015-12-29 | 2016-03-30 | 中国电子科技集团公司第十一研究所 | Fiber laser |
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