In a kind of semiconductor laser, micro optical lens is realized accurate on-Line Monitor Device and the using method thereof of debuging
Technical field
The present invention relates to laser technology application, in especially a kind of semiconductor laser, micro optical lens is realized accurate on-Line Monitor Device and the using method thereof of debuging.
Background technology
In the prior art, there is the advantages such as electro-optical efficiency is high, good reliability, miniaturization due to semiconductor laser, all developed rapidly and widespread use at aspects such as laser pumping source and direct application, particularly, as the pumping source of solid state laser and fiber laser, promote the fast development of all solid state laser.Semiconductor laser is due to the non-rotational symmetry waveguiding structure of itself, cause two axial angles of divergence larger and asymmetric, have a strong impact on its brightness and beam quality, the precision control of the angle of divergence and directive property is the prerequisite basic condition that semiconductor laser moves towards backend application.
Micro optical lens (FAC lens, SAC lens, BTS lens etc.) has that structure is small and exquisite, lightweight, collimation coupling efficiency advantages of higher, that semiconductor laser beam is realized high pointing accuracy, the low first-selected device of dispersing precise alignment, but such device is because the features such as focal length is little, size is little cause its assembly precision requirement very high, and General Requirements offset axis is to being the sub-milliradian magnitude of sub-micrometer scale, axial rotary.The monitoring system of debuging for semiconductor laser micro optical lens precision both at home and abroad at present cannot realize the on-line monitoring to micro optical lens six axle variable quantities simultaneously, need to debug in process switchable optics monitoring system back and forth at micro optical lens, and accurately influencing each other of displacement monitoring axle and turning axle, cannot reach the precision control requirement of semiconductor laser divergence angle and directive property.
Therefore the in real time accurate on-line monitoring that in semiconductor laser, micro optical lens precision is debug is that semiconductor laser is realized the angle of divergence and the accurate gordian technique of controlling of directive property always.
Summary of the invention
Object of the present invention, be exactly for the existing deficiency of prior art, and provide micro optical lens in a kind of semiconductor laser to realize the accurate on-Line Monitor Device of debuging and the technical scheme of using method thereof, this scheme is fixed to micro optical lens on six axle minute adjustment framves, adopt CCD as hot spot data acquisition element, based on light beam beam splitting principle, debug in process in micro optical lens precision, on-line monitoring near field and far-field spot data simultaneously, utilize the best spatial location criterion of near field CCD hot spot data variation as micro optical lens turning axle, utilize the best spatial location criterion of far field CCD hot spot data variation as micro optical lens offset axis, can realize the precision control of semiconductor laser fast and slow axis beam divergence angle and directive property.
This programme is achieved by the following technical measures:
In semiconductor laser, micro optical lens is realized an accurate on-Line Monitor Device of debuging, and includes semiconductor laser, micro optical lens, six axle minute adjustment framves, near field spectroscope, near field cylindrical lens, near field CCD, near field PC end, far field spectroscope, far field cylindrical lens, far field CCD, far field PC end and absorption cell; The laser beam that semiconductor laser is launched is through being fixed on directive near field spectroscope after micro optical lens on six axle minute adjustment framves; Laser beam after being reflected by near field spectroscope is through directive near field CCD after the cylindrical lens of near field; Near field CCD can hold the data transmission of collecting near field PC; Through spectroscopical laser beam directive far field, near field spectroscope; Laser beam after being reflected by far field spectroscope is through directive far field CCD after the cylindrical lens of far field; Far field CCD can hold the data transmission of collecting to far field PC; Through far field spectroscopical laser beam directive absorption cell.
As this programme preferably: the curvature of near field cylindrical lens distributes along the slow-axis direction of semiconductor laser; The spectroscopical reflectance near field is 1:1, and the incident angle of the spectroscopical laser beam in directive near field is 45 ° ± 1 °.
As this programme preferably: the curvature of far field cylindrical lens distributes along the quick shaft direction of semiconductor laser; The spectroscopical reflectance in far field is 7:3; The incident angle of the spectroscopical laser beam in directive far field is 45 ° ± 1 °.
In a kind of semiconductor laser, micro optical lens is realized the using method of the accurate on-Line Monitor Device of debuging: comprise the following steps:
Step 1: first set coordinate system: directions X is semiconductor laser slow-axis direction, Y-direction is semiconductor laser quick shaft direction, Z direction is semiconductor laser beam exit direction; Then micro optical lens is fixed on six axle adjusting brackets, by near field cylindrical lens, spectroscopical near field folded light beam is collected and entered in the CCD of near field simultaneously;
Step 2: by far field cylindrical lens, spectroscopical far field folded light beam is collected and entered in the CCD of far field, spectroscopical far field transmitted light beam is imported to absorption cell simultaneously;
Step 3: by the hot spot data variation of near field CCD, instruct six axle adjusting brackets that micro optical lens is adjusted to optimum position at three axial rotaries;
Step 4: by the hot spot data variation in the CCD of far field, instruct six axle adjusting brackets micro optical lens at three offset axises to being adjusted to optimum position.
As this programme preferably: in step 1, the curvature of near field cylindrical lens distributes along the slow-axis direction of semiconductor laser, its focal length is 300 ~ 500mm, and the spectroscopical reflectance near field is 1:1, and the incident angle of the spectroscopical laser beam in directive near field is 45 ° ± 1 °; In directions X and Y-direction, the be all not more than ± 0.1mm of geometric center deviation of the spectroscopical folded light beam barycenter near field and near field cylindrical lens, the be not more than ± 1mm of optimal imaging range deviation of near field CCD and near field cylindrical lens.
As this programme preferably: in step 2, the curvature of far field cylindrical lens distributes along the quick shaft direction of semiconductor laser, its focal length is 300 ~ 500mm, and the spectroscopical reflectance in far field is 7:3, and the incident angle of the spectroscopical laser beam in directive far field is 45 ° ± 1 °; In directions X and Y-direction, the be all not more than ± 0.1mm of geometric center deviation of the spectroscopical folded light beam barycenter in far field and far field cylindrical lens, the be not more than ± 1mm of rear focus deviation of far field CCD and far field cylindrical lens.
As this programme preferably: in step 3, the turning axle optimum position of micro optical lens is hot spot shadow-free around in the CCD of near field, leftmost side luminous point and the rightmost side be not more than ± 5 μ m of luminous point barycenter Y-direction deviation, all luminous point strength variances are less than ± and 0.1%.
As this programme preferably: in step 4, in requirement far field, the offset axis optimum position CCD of micro optical lens, reach minimum along Y-direction spot size.
The beneficial effect of this programme can be learnt according to the narration to such scheme, because this scheme is fixed to micro optical lens on six axle minute adjustment framves, adopt CCD as hot spot data acquisition element, based on light beam beam splitting principle, debug in process in micro optical lens precision, on-line monitoring near field and far-field spot data simultaneously, utilize the best spatial location criterion of near field CCD hot spot data variation as micro optical lens turning axle, utilize the best spatial location criterion of far field CCD hot spot data variation as micro optical lens offset axis, can realize the precision control of semiconductor laser fast and slow axis beam divergence angle and directive property.
As can be seen here, the present invention compared with prior art, there is the features such as level of integrated system is high, monitoring criterion is accurate reliable, the low divergence of realizing based on this invention, the semiconductor laser of high directivity can be applicable to the various fields such as light-pumped solid state laser, medical treatment and industrial processes, have outstanding substantive distinguishing features and progressive significantly, the beneficial effect of its enforcement is also apparent.
Brief description of the drawings
Fig. 1 is the structural representation of the specific embodiment of the invention.
In figure, 1 is semiconductor laser, and 2 is micro optical lens, and 3 is six axle minute adjustment framves, and 4 is near field spectroscope, 5 is near field cylindrical lens, and 6 is near field CCD, and 7 is near field PC end, and 8 is far field spectroscope, 9 is far field cylindrical lens, and 10 is far field CCD, and 11 is far field PC end, and 12 is absorption cell.
Embodiment
For clearly demonstrating the technical characterstic of this programme, below by an embodiment, and in conjunction with its accompanying drawing, this programme is set forth.
First set coordinate system: directions X is semiconductor laser slow-axis direction, Y-direction is semiconductor laser quick shaft direction, Z direction is semiconductor laser beam exit direction, micro optical lens is fixed on six axle adjusting brackets, with the bright dipping of direct supply driving semiconductor laser, regulate six axle adjusting brackets, noise spectra of semiconductor lasers is carried out preliminary collimation.
On the semiconductor laser beam transmission path of preliminary collimation, place the near field spectroscope that reflectance is 1:1, the angle of near field spectroscope and incident laser light beam constrains within the scope of (45 ± 1) °.
On the spectroscope folded light beam transmission path of near field, place near field cylindrical lens, the angle of near field cylindrical lens and near field spectroscope folded light beam constrains within the scope of (0 ± 1) °, the distance of semiconductor laser exiting surface and near field cylindrical lens is greater than the twice of near field cylindrical lens focal length simultaneously, in X and Y-direction, the all be not more than ± 0.1mm of geometric center deviation of the spectroscopical folded light beam barycenter near field and near field cylindrical lens, the be not more than ± 1mm of optimal imaging range deviation of near field CCD and near field cylindrical lens.
On the spectroscope transmitted light beam transmission path of near field, place the far field spectroscope that reflectance is 7:3, the angle of far field spectroscope and near field spectroscope transmitted light beam constrains within the scope of (45 ± 1) °.
On the spectroscope folded light beam transmission path of far field, place far field cylindrical lens, the angle of far field cylindrical lens and far field spectroscope folded light beam constrains within the scope of (0 ± 1) °, in X and Y-direction, the all be not more than ± 0.1mm of geometric center deviation of the spectroscopical folded light beam barycenter in far field and far field cylindrical lens, be not more than ± the 1mm of rear focus deviation of far field CCD and far field cylindrical lens imports absorption cell by spectroscopical far field transmitted light beam simultaneously.
Adopt six axle adjusting brackets to carry out minute adjustment to micro optical lens offset axis and turning axle, best spatial location criterion by near field CCD hot spot data variation as micro optical lens turning axle, best spatial location criterion by far field CCD hot spot data variation as micro optical lens offset axis, hot spot shadow-free around in requirement near field, the turning axle optimum position CCD of micro optical lens, leftmost side luminous point and the rightmost side be not more than ± 5 μ m of luminous point barycenter Y-direction deviation, all luminous point strength variances are less than ± and 0.1%; In requirement far field, the offset axis optimum position CCD of micro optical lens, reach minimum along Y-direction spot size.
The present invention is not only confined to above-mentioned embodiment, and persons skilled in the art, according to content disclosed by the invention, can adopt other concrete embodiments to implement the present invention and reach the object that realizes of the present invention.Therefore, every employing project organization of the present invention and thinking, carry out a bit or design that some points simply convert, change, all falls into the scope of protection of the invention.