CN204012174U - Full fiberize laser frequency mixer and mixing fiber laser thereof - Google Patents
Full fiberize laser frequency mixer and mixing fiber laser thereof Download PDFInfo
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- CN204012174U CN204012174U CN201420248027.8U CN201420248027U CN204012174U CN 204012174 U CN204012174 U CN 204012174U CN 201420248027 U CN201420248027 U CN 201420248027U CN 204012174 U CN204012174 U CN 204012174U
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Abstract
The utility model relates to laser frequency mixing technique field, relates in particular to a kind of full fiberize laser frequency mixer and mixing fiber laser thereof.Described full fiberize laser frequency mixer and mixing fiber laser thereof, utilize gradient index fibre (Grin optical fiber) coupling technique, realize the laser frequency mixer of full fiberize, and then combine with fiber laser, can realize the mixing fiber laser of full fiberize.This device can realize to 976nm Yb-doped fiber laser, 1 μ m Yb-doped fiber laser, 1.5 μ m erbiums mix co-doped fiber laser, 1.9 μ m thulium-doped fiber lasers, 2 μ m thulium holmium co-doped fiber lasers, 2.8 μ m mix Er ZBLAN fiber laser, Raman fiber lasers and frequency multiplication/and the linear polarization narrow cable and wide optical fiber laser such as frequency/difference frequency laser in any one or two kinds carry out full fiberize frequency multiplication and frequently or difference frequency, realize the full fiberize fiber laser that covers ultraviolet light, visible ray, near-infrared, middle-infrared band.
Description
Technical field
The utility model relates to laser frequency mixing technique field, relates in particular to a kind of full fiberize laser frequency mixer and mixing fiber laser thereof.
Background technology
The laser frequency mixing techniques such as laser freuqency doubling and frequency and difference frequency are the important channels of realizing many laser with new wavelength devices, by frequency multiplication or with frequency, mid-infrared laser can be changed into near-infrared laser, near-infrared laser is changed into visible ray or changes visible laser into Ultra-Violet Laser; By laser difference frequency, near-infrared laser can be converted into mid-infrared laser, thus the scope that expanded laser light spectral line covers.Visible UV laser is widely used in the fields such as laser processing, laser medicine, laser display, body laser inner carving; Mid-infrared laser is widely used in the fields such as Atmospheric Survey, laser medicine, infrared counteraction.Thereby laser frequency mixing technique has important application in the generation of each wave band of laser.
The mainstream technology of current laser mixing be utilize non-linear frequency multiplication/and the crystal mixing that frequency/difference frequency crystal carries out Space Coupling to the solid state laser of diode pumping realize, cause whole system complex structure, needs a large amount of Space Collimation coupling debugging, mechanical stability not high, guarantee that system stability running needs irregular debugging maintenance.In order to improve frequency multiplication based on solid state laser pumping/and heat problem and the stability of frequency/difference frequency laser, at present the existing fiber laser that adopts carries out laser mixing as fundamental frequency light, can obtain that transformation efficiency is high, good beam quality, the comparatively simple mixing laser output of structure.However, fiber laser and frequency multiplication/and frequency/difference frequency crystal between the still further application of limit fibre laser frequency mixing technique of stability of a system problem that causes of space Lens Coupling, be difficult to obtain the full fiberize mixing laser device of similar fiber laser.
Utility model content
Technical problem to be solved in the utility model is: a kind of full fiberize laser frequency mixer and mixing fiber laser thereof are provided, utilize gradient index fibre (Grin optical fiber) coupling technique, realize the laser frequency mixer of full fiberize, and then combine with fiber laser, realize the mixing fiber laser of full fiberize.The utility model is achieved in that
A full fiberize laser frequency mixer, comprises being of coupled connections successively:
Laser frequency mixer input optical fibre, for inputting mixing fundamental frequency light used;
The first coreless fiber, expands transmission for the fundamental frequency light to through described laser frequency mixer 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;
Mixer crystal, for the fundamental frequency light of input after described the second coreless fiber focuses on transmission is carried out to nonlinear frequency conversion, produces mixing laser;
The 3rd coreless fiber, expands transmission for the mixing laser that described mixer crystal is produced;
The 2nd Grin optical fiber, for collimating and focus on the mixing laser of inputting after described the 3rd coreless fiber expands transmission;
The 4th coreless fiber, focuses on transmission for the mixing laser to through described the 2nd Grin fiber optic collimator and after focusing on;
Laser frequency mixer output optical fibre, for transmitting the mixing laser of input after described the 4th coreless fiber focuses on transmission;
Optical fiber end cap, for avoiding end face reflection to cause damage to system.
Further, described fundamental frequency light is linear polarization narrow-linewidth laser.
Further, described laser frequency mixer input optical fibre is polarization maintaining optical fibre.
Further, described laser frequency mixer output optical fibre is the polarization maintaining optical fibre that cut-off wavelength is less than described mixing laser wavelength.
Further, the phase matching wavelengths of described mixer crystal is consistent with described fundamental frequency light wavelength.
A mixing fiber laser, comprises any one full fiberize laser frequency mixer as above, also comprises the first fiber laser and the first polarization relationship type fibre optic isolater;
Described the first fiber laser is for providing mixing fundamental frequency light used;
Described first input of polarization relationship type fibre optic isolater and the output of described the first fiber laser are of coupled connections;
The output of described the first polarization relationship type fibre optic isolater and described laser frequency mixer input optical fibre are of coupled connections.
Further, described mixing fiber laser also comprises the second fiber laser, the second polarization relationship type fibre optic isolater and wavelength division multiplexer;
Described the second fiber laser is for providing mixing fundamental frequency light used;
Described second input of polarization relationship type fibre optic isolater and the output of described the second fiber laser are of coupled connections;
The output of the output of described the first polarization relationship type fibre optic isolater and the second polarization relationship type fibre optic isolater is of coupled connections by described wavelength division multiplexer and described laser frequency mixer input optical fibre.
Further, the phase matching wavelengths of described mixer crystal is consistent with the operation wavelength of described the first fiber laser and the second fiber laser.
Further, described first input of polarization relationship type fibre optic isolater and the optical fiber of output are the polarization maintaining optical fibre identical with the output optical fiber parameter of described the first fiber laser; Described second input of polarization relationship type fibre optic isolater and the optical fiber of output are the polarization maintaining optical fibre identical with the output optical fiber parameter of described the second fiber laser.
Further, described the first fiber laser and the second fiber laser are linear polarization narrow cable and wide optical fiber laser.
Further, the input end fiber of described mixer crystal is the polarization maintaining optical fibre that parameter is identical with the output optical fiber of described wavelength division multiplexer.
Compared with prior art, the utility model can provide a kind of laser frequency mixer of full fiberize, by combining with the linear polarization narrow cable and wide optical fiber laser with high-peak power or average power, can realize the mixing fiber laser of full fiberize.This device can to 976nm Yb-doped fiber laser, 1 μ m Yb-doped fiber laser, 1.5 μ m erbiums mix co-doped fiber laser, 1.9 μ m thulium-doped fiber lasers, 2 μ m thulium holmium co-doped fiber lasers, 2.8 μ m mix Er ZBLAN fiber laser, Raman fiber lasers and frequency multiplication/and the linear polarization narrow cable and wide optical fiber laser such as frequency/difference frequency laser in any one or two kinds carry out full fiberize frequency multiplication and frequently or difference frequency, realize the full fiberize fiber laser that covers ultraviolet light, visible ray, near-infrared, middle-infrared band.
Accompanying drawing explanation
Fig. 1: the full fiberize laser mixer architecture schematic diagram that the utility model embodiment provides;
Fig. 2: the mixing optical fiber laser structure schematic diagram based on above-mentioned full fiberize laser frequency mixer that the utility model embodiment provides;
Fig. 3: the mixing optical fiber laser structure schematic diagram of the another kind that the utility model embodiment provides based on above-mentioned full fiberize laser frequency mixer.
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 shows the full fiberize laser mixer architecture schematic diagram that the utility model embodiment provides.Shown in Fig. 1, full fiberize laser frequency mixer comprises laser frequency mixer input optical fibre 6, the first coreless fiber 7, a Grin optical fiber 8, the second coreless fiber 9, mixer crystal 10, the 3rd coreless fiber 11, the 2nd Grin optical fiber 12, the 4th coreless fiber 13, laser frequency mixer output optical fibre 14, the optical fiber end cap 15 being of coupled connections successively.
In above-mentioned each structure, laser frequency mixer input optical fibre 6 is a kind of polarization maintaining optical fibre, for inputting mixing fundamental frequency light used.This fundamental frequency light is linear polarization narrow-linewidth laser.The first coreless fiber 7, a Grin optical fiber 8 and the second coreless fiber 9 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 mixer crystal 10 center.Particularly, the first coreless fiber 7 expands transmission for the fundamental frequency light to through described laser frequency mixer input optical fibre input.Here so-called expand transmission refer to: the first coreless fiber 7 is equivalent to the free space before space-focusing lens, fundamental frequency light through 6 inputs of laser frequency mixer input optical fibre enters the first coreless fiber 7, and transmission in the first coreless fiber 7, in the process of transmission, fundamental frequency light light beam can be dispersed gradually, thereby plays the effect of expanding.The length of the first coreless fiber 7 can calculate according to actual needs.Fundamental frequency light expands after transmission through the first coreless fiber 7, enters a Grin optical fiber 8.Fundamental frequency light reaches larger spot diameter while entering a Grin optical fiber 8.The one Grin optical fiber 8 is for collimating and focus on the fundamental frequency light of inputting after the first coreless fiber 7 expands transmission.The second coreless fiber 9 focuses on transmission for the fundamental frequency light to through Grin optical fiber 8 collimations and after focusing on, and it is entered after mixer crystal 10, in the center of mixer crystal 10, focuses on and becomes minimum waist spot.Here so-called focusing transmission refers to: the second coreless fiber 9 is equivalent to the free space after space-focusing lens, fundamental frequency light after the one Grin optical fiber 8 collimations and focusing enters after the second coreless fiber 9, and transmission in the second coreless fiber 9, in the process of transmission, fundamental frequency light light beam can draw in gradually, thereby plays focussing force.The length of the second coreless fiber 9 can calculate according to actual needs.Mixer crystal 10 is phase matched or accurate phase matched mixing (frequency multiplication/and frequency/difference frequency) crystal, and its phase matching wavelengths is consistent with fundamental frequency light wavelength.Mixer crystal 10 is for carrying out nonlinear frequency conversion to the fundamental frequency light of input after the second coreless fiber 9 focuses on transmission, produce mixing laser, the mixing laser producing is that frequency is the mixing laser of 2 ω 1 (frequency multiplication) or ω 1+ ω 1 (and frequently) or ω 1-ω 1 (difference frequency), wherein, ω 1 is fundamental frequency light frequency.The mixing laser producing enters the 3rd coreless fiber 11 from mixer crystal 10.The 3rd coreless fiber 11, the 2nd Grin optical fiber 12 and the 4th coreless fiber 13 threes' combination, with aforementioned the same, also the free space that is equivalent to space-focusing lens and front and back thereof, it utilizes self focusing principle mixing optical alignment and focusing to be entered to the fibre core of laser frequency mixer output optical fibre 14.Particularly, the 3rd coreless fiber 11 expands transmission for the mixing laser that mixer crystal 10 is produced, while making it enter the 2nd Grin optical fiber 12, reach larger spot diameter, the 2nd Grin optical fiber 12 is for the mixing laser of inputting after the 3rd coreless fiber 11 expands transmission is collimated and focused on, and the 4th coreless fiber 13 focuses on transmission for the mixing laser to through the 2nd Grin optical fiber 12 collimations and after focusing on.Laser frequency mixer output optical fibre 14 is described mixing laser for cut-off wavelength is less than, and at the polarization maintaining optical fibre of mixing laser wavelength place low-loss transmission, for exporting the mixing laser of input after the 4th coreless fiber 13 focuses on transmission.Optical fiber end cap 15, for preventing that laser from being gone back by the end face reflection of laser frequency mixer output optical fibre 14, can avoid system to cause damage.
In said structure, can be according to fundamental frequency light wavelength, and laser frequency mixer input optical fibre 6, the parameter of laser frequency mixer output optical fibre 14 are, parameters such as the length of mixer crystal 10 and refractive indexes, optimally select to have the bar-shaped Grin optical fiber of long-pitch, and then analog computation draws the length of optimized the first coreless fiber 7 of coupling efficiency, a Grin optical fiber 8, the second coreless fiber 9, the 3rd coreless fiber 11, the 2nd Grin optical fiber 12 and the 4th coreless fiber 13.The first coreless fiber 7, the second coreless fiber 9, the 3rd coreless fiber 11 and the 4th coreless fiber 13 all optimally adopt bar-shaped coreless fiber.Then, by special optical fiber heat sealing machine according to the above-mentioned relation that is of coupled connections by above-mentioned each fused fiber splice, during welding, the length of each section of optical fiber is blocked by the optimal length of calculating gained, meanwhile, by angle adjustment, guarantees mating of polarization maintaining optical fibre polarization direction and mixer crystal correspondence direction.
Above-mentioned each structure has formed the full fiberize laser frequency mixer 16 that the utility model embodiment provides.As shown in Figures 2 and 3, on the basis of full fiberize laser frequency mixer 16, the utility model embodiment also provides a kind of mixing fiber laser.As shown in Figure 2, this mixing fiber laser, except comprising above-mentioned full fiberize laser frequency mixer 15, also comprises for the first fiber laser 1 and second fiber laser 2 of mixing fundamental frequency light used are provided.First input of polarization relationship type fibre optic isolater 3 and the output of the first fiber laser 1 are of coupled connections.Second input of polarization relationship type fibre optic isolater 4 and the output of the second fiber laser 2 are of coupled connections.Two inputs of wavelength division multiplexer 5 are of coupled connections with the output of the first polarization relationship type fibre optic isolater 3 and the second polarization relationship type fibre optic isolater 4 respectively.The output of wavelength division multiplexer 5 and laser frequency mixer input optical fibre 6 are of coupled connections.
In said structure, first input of polarization relationship type fibre optic isolater 3 and the optical fiber of output are the polarization maintaining optical fibre identical with the output optical fiber parameter of the first fiber laser 1, and second input of polarization relationship type fibre optic isolater 4 and the optical fiber of output are the polarization maintaining optical fibre identical with the output optical fiber parameter of the second fiber laser 2.The damage of the feedback light that the first polarization relationship type fibre optic isolater 3 and the second polarization relationship type fibre optic isolater 4 are respectively used to prevent rear class separately to the first fiber laser 1 and the second fiber laser 2.The first fiber laser 1 and the second fiber laser 2 are linear polarization narrow cable and wide optical fiber laser, and its output high-power linear polarization narrow-linewidth laser is as mixing fundamental frequency light used.The input of wavelength division multiplexer 5 and the optical fiber of output are also polarization maintaining optical fibre.Mixer crystal 10 is the phase matched consistent with the frequency of the first fiber laser 1 and the second fiber laser 2 or accurate phase matched mixing (frequency multiplication/and frequency/difference frequency) crystal.The optical fiber of the output of mixer crystal 10 is also selected the polarization maintaining optical fibre identical with the optical fiber parameter of the output of wavelength division multiplexer 5.
It is to be noted, for laser freuqency doubling, before full fiberize laser frequency mixer 16, only need to select the corresponding fiber laser of a type, and do not need to adopt wavelength division multiplexer 5, only by the first polarization relationship type fibre optic isolater 3 and the second polarization relationship type fibre optic isolater 4, be directly connected (as shown in Figure 3) with 6 couplings of laser frequency mixer input optical fibre.For laser and frequency or difference frequency, before full fiberize laser frequency mixer 16, just need to select the corresponding fiber laser of two types, and by the first polarization relationship type fibre optic isolater 3 and 5 two inputs of the second polarization relationship type fibre optic isolater 4 and wavelength division multiplexer, be connected respectively, the optical fiber by 5 two outputs of wavelength division multiplexer is input to laser frequency mixer input optical fibre 6 (as shown in Figure 2) by two kinds of fundamental frequency light mixing.
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.
Claims (11)
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420248027.8U CN204012174U (en) | 2014-05-14 | 2014-05-14 | Full fiberize laser frequency mixer and mixing fiber laser thereof |
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| CN201420248027.8U CN204012174U (en) | 2014-05-14 | 2014-05-14 | Full fiberize laser frequency mixer and mixing fiber laser thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104009379A (en) * | 2014-05-14 | 2014-08-27 | 深圳大学 | All-fiber laser frequency mixer and frequency mixer fiber laser thereof |
| CN105022120A (en) * | 2015-08-21 | 2015-11-04 | 珠海光库科技股份有限公司 | Optical fiber collimator and manufacturing method thereof |
-
2014
- 2014-05-14 CN CN201420248027.8U patent/CN204012174U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104009379A (en) * | 2014-05-14 | 2014-08-27 | 深圳大学 | All-fiber laser frequency mixer and frequency mixer fiber laser thereof |
| WO2015172699A1 (en) * | 2014-05-14 | 2015-11-19 | 深圳大学 | All-fibre laser mixer and mixing optical fibre laser thereof |
| CN105022120A (en) * | 2015-08-21 | 2015-11-04 | 珠海光库科技股份有限公司 | Optical fiber collimator and manufacturing method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 |