CN204391492U - A kind of external cavity feedback formula diode laser spectrum combining optical of densification layout - Google Patents
A kind of external cavity feedback formula diode laser spectrum combining optical of densification layout Download PDFInfo
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- CN204391492U CN204391492U CN201520131538.6U CN201520131538U CN204391492U CN 204391492 U CN204391492 U CN 204391492U CN 201520131538 U CN201520131538 U CN 201520131538U CN 204391492 U CN204391492 U CN 204391492U
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Abstract
The utility model discloses a kind of external cavity feedback formula diode laser spectrum combining optical of densification layout, comprise diode laser, slow axis transition mast lens, diffraction grating, focal lens and external cavity mirror, described diffraction grating is positioned on the back focal plane of slow axis transition mast lens; A focal lens is set between described external cavity mirror and diffraction grating, described focal lens and slow axis transition mast lens form set of lenses, within the equivalent front focal plane of described set of lenses is positioned at slow axis transition mast lens front one times of focal length, and diode laser is positioned on the equivalent front focal plane of set of lenses, described external cavity mirror is positioned at the equivalent back focal plane of set of lenses; The laser that described diode laser sends is after slow axis transition mast lens, diffraction grating and focal lens, light beam by exiting parallel, and impinges perpendicularly in external cavity mirror, after external cavity mirror reflection, laser returns former luminescence unit through original optical path, forms complete oscillation circuit; The utility model makes diode laser spectrum synthesis system reduce the size of nearly half, thus reduces the overall volume scale of Optical Maser System, furthermore achieved that the densification layout of system.
Description
Technical field
The utility model belongs to field of laser device technology, is specifically related to a kind of external cavity feedback formula diode laser spectrum combining optical of densification layout.External cavity feedback formula synthesis system densification, the miniaturization more that this Spectral beam combining system is more general.
Background technology
Diode laser has the series of advantages such as electrical efficiency is high, wavelength cover is wide, volume is little, lightweight, reliability is high, but high power diode laser beam quality is poor at present, and the angle of divergence is large, limits its direct application.Adopt diode laser spectrum synthetic technology that the quality of synthesis light beam can be made suitable with the sub-luminescence unit participating in synthesizing, compensate for the shortcoming that diode laser light beam quality is poor, significantly improve the luminosity of diode laser, therefore directly utilize diode laser to form the laser system of efficient, compact lightweight and not by the transfer process at line pump Pu, be hopeful to realize one of technique direction that high brightness laser exports most." high brightness wavelength synthesized semiconductor laser linear array " (High-Brightness Wavelength Beam Combined Semiconductor Laser Diode Arrays by name, Robin K. Huang etal. IEEE PHOTONICS TECHNOLOGY LETTERS, 2007,19 (4), 209-211) article has been described in detail the principle that the diode laser spectrum based on " grating+external cavity feedback " synthesizes.In the light path layout of the external cavity feedback formula diode of these classics, diode laser array and diffraction grating lay respectively at front focal plane and the back focal plane of slow axis convertible lens, and the length of combining optical is at least 2 times of focal lengths of slow axis convertible lens.Due to the requirement to synthesis laser spectroscopy width, the focal length of slow axis convertible lens often designs larger, therefore causes the volume of synthesis system comparatively huge, is unfavorable for the design of the compact of Optical Maser System.
Utility model content
In order to make diode Spectral beam combining system densification more, the utility model devises a kind of external cavity feedback formula diode laser spectrum combining optical of densification layout, by increasing a focal lens before external cavity mirror, make diode laser array can be positioned over slow axis transition mast lens front face compactly, thus greatly reduce the volume scale of Spectral beam combining system.
For achieving the above object, the utility model adopts following technical scheme:
An external cavity feedback formula diode laser spectrum combining optical for densification layout, comprise diode laser, slow axis transition mast lens, diffraction grating, focal lens and external cavity mirror, described diffraction grating is positioned on the back focal plane of slow axis transition mast lens; A focal lens is set between described external cavity mirror and diffraction grating, described focal lens and slow axis transition mast lens form set of lenses, within the equivalent front focal plane of described set of lenses is positioned at slow axis transition mast lens front one times of focal length, and diode laser is positioned on the equivalent front focal plane of set of lenses, described external cavity mirror is positioned at the equivalent back focal plane of set of lenses; The laser that described diode laser sends is after slow axis transition mast lens, diffraction grating and focal lens, light beam by exiting parallel, and impinges perpendicularly in external cavity mirror, after external cavity mirror reflection, laser returns former luminescence unit through original optical path, forms complete oscillation circuit.It is suitable that the core of this technical scheme is that slow axis transition mast lens and focal lens form the focal length of the slow axis transition mast lens in the focal length of set of lenses and classical synthesis system, can design larger according to the spectrum width of synthesized laser beam, by optical design can make the slow axis transition mast focal length in this utility model system be set of lenses equivalent focal length tens of/mono-, and set of lenses equivalence is within front focal plane is positioned at slow axis transition mast one times of focal length.
In technique scheme, described diffraction grating or be reflective planar grating or for transmission-type plane grating.
In technique scheme, the focal length of slow axis transition mast lens be set of lenses equivalent focal length tens of/mono-, wherein number is the arbitrary natural number between to nine.
In technique scheme, within set of lenses equivalence front focal plane is positioned at one times of focal length of slow axis transition mast lens.
In technique scheme, described diode laser comprises diode laser linear array, fast axis collimation lens and slow axis collimating lens successively from exit direction.
In technique scheme, described external cavity mirror partially reflecting mirror, front surface plates the spectro-film of resistance to high light.
In technique scheme, the reflectivity of described spectro-film is 5% ~ 30%.
In the utility model, because diode laser array is positioned on the equivalent front focal plane of set of lenses, laser is after slow axis transition mast lens, diffraction grating and focal lens, and light beam by exiting parallel, and impinges perpendicularly in external cavity mirror.After external cavity mirror reflection, laser returns former luminescence unit through original optical path, thus forms complete oscillation circuit.Compared with the external cavity feedback formula diode laser spectrum synthesis system of classics, diode laser array is not the front focal plane being placed in slow axis transition mast lens, but be positioned over the front focal plane that slow axis transition mast lens and focal lens form set of lenses, within it is positioned at slow axis transition mast lens one times of focal length, and the slow axis transition mast focal length of lens be set of lenses equivalent focal length tens of/mono-, the size of Spectral beam combining system therefore can be made to be reduced to close to original half.
In sum, owing to have employed technique scheme, the beneficial effects of the utility model are: because add focal lens thus the reason of formation set of lenses, the distance between slow axis transition mast lens and lasing light emitter can be made significantly to reduce, and the effect and quality of Laser synthesizing can also be ensured.Particularly in and the project that has specific demand to space large-scale at some and system, make diode laser spectrum synthesis system reduce the size of nearly half, thus reduce the overall volume scale of Optical Maser System, optimize the compact designed of system further.The compression of system space will bring excellent Practical effect, and this is not only embodied in the saving of Financial cost, be embodied on system compact more.
Accompanying drawing explanation
The utility model illustrates by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is layout and the light path schematic diagram of general-purpose diode laser spectroscopy synthesis system;
Fig. 2 is a kind of layout of the present utility model and light path schematic diagram;
Fig. 3 is another kind of layout of the present utility model and light path schematic diagram;
Fig. 4 is the structural representation of the diode laser in the utility model;
In figure, 1 is diode laser, 2 are slow axis transition mast lens, 3 are reflective planar gratings, 4 are external cavity mirror, 5 are focal lenses, 6 are transmission-type plane gratings, 7 is diode laser linear arrays, and 8 are fast axis collimation lens, 9 is slow axis collimating lenses.
Embodiment
As shown in Figure 1, be general-purpose diode laser spectroscopy synthesis system, specifically comprise diode laser, slow axis transition mast lens, reflective planar grating, external cavity mirror.Because diode laser is positioned at the front focal plane of slow axis transition mast lens, reflective planar grating is positioned at the back focal plane of slow axis transition mast lens, so the light that in diode laser, a certain sub-luminescence unit sends is parallel after slow axis transition mast lens be incident to reflective planar grating.The incidence angle that the laser that different sub-luminescence unit sends is incident to reflective planar grating is inconsistent, but because its wavelength is not identical yet, because the matching relationship of incident angle and wavelength, by reflective planar grating diffration, all parallel light outgoing, and direction is vertical with external cavity mirror.External cavity mirror is partially reflecting mirror, and most of laser-transmitting, becomes Output of laser; Fraction laser, through the reflection of external cavity mirror, gets back to each sub-luminescence unit along original optical path, forms complete oscillation loop.Due to the feedback mechanism that external cavity mirror causes, the laser meeting above-mentioned oscillation mode is constantly strengthened, thus arrive the object of Laser synthesizing.
Be illustrated in figure 2 layout of the present utility model and light path schematic diagram.For reducing the volume of Spectral beam combining system, focal lens is increased before external cavity mirror, itself and slow axis transition mast lens form a set of lenses, and by optical optimization design can make the focal length of slow axis transition mast lens be set of lenses focal length tens of/mono-, and within the equivalent front focal plane of this set of lenses is positioned at slow axis transition mast lens one times of focal length.Diode laser is positioned over the equivalent front focal plane of this set of lenses, reflective planar grating is positioned on the back focal plane of slow axis transition mast lens.The incidence angle that the light that in diode laser, a certain sub-luminescence unit sends is incident on reflective planar grating after slow axis transition mast lens is inconsistent, the angle of diffraction is also inconsistent, but because diode laser is positioned at the equivalent front focal plane of set of lenses, laser exiting parallel after focal lens; Its wavelength of light that the different sub-luminescence unit of diode laser sends is variant, by grating diffration effect, laser diffraction angle and incident angle and wavelength are matched, and the laser exiting parallel after focal lens causing all luminescence units to send, its exit direction is perpendicular to external cavity mirror.Part through external cavity mirror reflects, and reflects laser gets back to each sub-luminescence unit along original optical path, forms complete oscillation loop.Due to the feedback mechanism that external cavity mirror causes, the laser meeting above-mentioned oscillation mode is constantly strengthened, thus arrive the object of laser far field coincidence.Because reflective planar grating is positioned on the back focal plane of slow axis transition mast lens, the light that the different sub-luminescence unit of diode laser sends realizes the coincidence near field on grating.Near field and far field all realize overlapping, and achieve the object of diode laser light Shu Hecheng.
Be illustrated in figure 3 layout of the present utility model and light path schematic diagram.The present embodiment is identical with the above embodiments basic structure, and difference is: the diffraction grating that above-described embodiment adopts is reflective planar grating, and the diffraction grating that the present embodiment adopts is transmission-type plane grating.To the present embodiment, require diode laser to be positioned at equally equivalent front focal plane that slow axis transition mast lens and post lens form set of lenses, and transmission-type plane grating is positioned on the back focal plane of slow axis transition mast lens.The composition principle of the present embodiment is same as the previously described embodiments.
In Fig. 4, the structural representation of the diode laser that the external cavity feedback formula diode laser spectrum combining optical for the utility model densification layout adopts, specifically comprises diode laser linear array, fast axis collimation lens, slow axis collimating lens.Diode laser linear array is made up of dozens of even up to a hundred equally spaced chips, and after energising, each chip gives off laser beam, and forms each sub-luminescence unit to be synthesized.Fast axis collimation lens and slow axis collimating lens collimate on fast axle and slow-axis direction each sub-luminescence unit respectively.In synthesis system, diode laser can use single laser linear array, also can splice multiple linear array on quick shaft direction, forms diode laser and folds battle array, carries out the synthesis of more massive diode laser light spectrum.
The utility model is not limited to aforesaid embodiment.The utility model expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.
Claims (7)
1. an external cavity feedback formula diode laser spectrum combining optical for densification layout, comprise diode laser, slow axis transition mast lens, diffraction grating, focal lens and external cavity mirror, described diffraction grating is positioned at the back focal plane of slow axis transition mast lens; It is characterized in that described focal lens is arranged between external cavity mirror and diffraction grating, itself and slow axis transition mast lens form set of lenses; And diode laser is positioned on the equivalent front focal plane of set of lenses, described external cavity mirror is positioned at the equivalent back focal plane of set of lenses; The laser that described diode laser sends is after slow axis transition mast lens, diffraction grating and focal lens, and light beam is by exiting parallel in external cavity mirror, and after external cavity mirror reflection, laser returns former luminescence unit through original optical path, forms complete oscillation circuit.
2. the external cavity feedback formula diode laser spectrum combining optical of a kind of densification layout according to claim 1, it is characterized in that the slow axis transition mast focal length of lens be set of lenses equivalent focal length tens of/mono-, wherein number is the arbitrary natural number between to nine.
3. the external cavity feedback formula diode laser spectrum combining optical of a kind of densification layout according to claim 1, within is characterized in that set of lenses equivalence front focal plane is positioned at slow axis transition mast lens front one times of focal length.
4. the external cavity feedback formula diode laser spectrum combining optical of a kind of densification layout according to claim 1, is characterized in that described diffraction grating or for reflective planar grating or for transmission-type plane grating.
5. the external cavity feedback formula diode laser spectrum combining optical of a kind of densification layout according to claim 1, is characterized in that described diode laser comprises diode laser linear array, fast axis collimation lens and slow axis collimating lens successively from exit direction.
6. the external cavity feedback formula diode laser spectrum combining optical of a kind of densification layout according to claim 1, it is characterized in that described external cavity mirror is partially reflecting mirror, front surface plates the spectro-film of resistance to high light.
7. the external cavity feedback formula diode laser spectrum combining optical of a kind of densification layout according to claim 6, is characterized in that the reflectivity of described spectro-film is 5% ~ 30%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104638513A (en) * | 2015-03-09 | 2015-05-20 | 中国工程物理研究院应用电子学研究所 | External cavity feedback type diode laser spectrum synthesis optical system in compact layout |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104638513A (en) * | 2015-03-09 | 2015-05-20 | 中国工程物理研究院应用电子学研究所 | External cavity feedback type diode laser spectrum synthesis optical system in compact layout |
| CN104638513B (en) * | 2015-03-09 | 2017-06-30 | 中国工程物理研究院应用电子学研究所 | A kind of external cavity feedback formula diode laser spectrum combining optical of densification layout |
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