Utility model content
The utility model provides a kind of multiple-channel output laser crystal, to solve the above-mentioned problems in the prior art.
The utility model provides a kind of multiple-channel output laser, comprise pump light source, laser crystal, frequency-doubling crystal and outgoing mirror, described pump light source is single bar bar semiconductor laser array, and described single bar bar semiconductor laser array, laser crystal, frequency-doubling crystal and outgoing mirror are successively set in same light path; At least two luminous units are comprised in described single bar bar semiconductor laser array; Distance between described single bar bar semiconductor laser array and laser crystal is predeterminable range; Resonant cavity is formed between the plane of incidence of described laser crystal and the plane of incidence of described outgoing mirror.
Optionally, described predeterminable range scope is more than or equal to 0.1mm, and be less than or equal to 1.5mm.
Optionally, described predeterminable range is 0.7mm.
Optionally, the thickness range of described laser crystal is more than or equal to 0.5mm, and be less than or equal to 1.5mm.
Optionally, the length range of described laser crystal is more than or equal to 2mm, and be less than or equal to 10mm; Width range is more than or equal to 7mm, and be less than or equal to 12mm.
Optionally, the quantitative range comprising luminous unit in described single bar bar semiconductor laser array is more than or equal to 15, and be less than or equal to 25.
Optionally, the quantity comprising luminous unit in described laser array is 19.
Optionally, described luminous unit forms described laser array according to longitudinal row and horizontal row arrangement respectively, distance between adjacent luminous unit on described laterally row is called lateral separation, distance between adjacent luminous unit on described longitudinal row is called longitudinal separation, and described lateral separation is identical with described longitudinal separation.
Optionally, described laterally spaced scope for being more than or equal to 0.2mm, and is less than or equal to 0.5mm.
Optionally, described lateral separation is 0.3mm.
Optionally, the output power range of described each luminous unit for being more than or equal to 2W, and is less than or equal to 3W.
Optionally, the length range of described frequency-doubling crystal is more than or equal to 2mm, and be less than or equal to 4mm; Width range is more than or equal to 8mm, and be less than or equal to 12mm; Thickness range is more than or equal to 0.5mm, and be less than or equal to 1.5mm.
Optionally, the exit facet of described laser crystal plates the anti-reflection film of 1064nm; The plane of incidence of described laser crystal and the plane of incidence of described outgoing mirror form resonant cavity specifically, and the plane of incidence of described laser crystal and the plane of incidence of described outgoing mirror all plate 1064nm high-reflecting film.
Optionally, the exit facet of described laser crystal plates the anti-reflection film of 912nm; The plane of incidence of described laser crystal and the plane of incidence of described outgoing mirror form resonant cavity specifically, all plate 912nm high-reflecting film on the plane of incidence of described laser crystal and on the plane of incidence of described outgoing mirror.
Optionally, described outgoing mirror is level crossing.
Compared with prior art, the utility model has the following advantages:
The utility model provides a kind of multiple-channel output laser, comprise pump light source, laser crystal, frequency-doubling crystal and outgoing mirror, on the plane of incidence of described laser crystal and on the plane of incidence of described outgoing mirror, high anti-coating is all set, between two planes of incidence being provided with high anti-coating, forms resonant cavity; Described pump light source is single bar bar semiconductor laser array, and described single bar bar semiconductor laser array, laser crystal, frequency-doubling crystal and outgoing mirror are successively set in same light path; At least two luminous units are comprised in described single bar bar semiconductor laser array; Distance between described single bar bar semiconductor laser array and laser crystal is predeterminable range.This laser is taken to the lists bar bar semiconductor laser arrays of rare two luminous units as pump light source, can multiple-channel output laser beam, not only can reduce speckle, can also increase power output.Above-mentioned predeterminable range determines according to the angle of divergence size of light, and under this predeterminable range, the hot spot exposed on laser crystal can ensure pump power density, overcomes the angle of scattering problem of pump light source transmitted beam.The compact conformation of this laser in addition, small volume.
In addition, the utility model also provides a kind of preferred version of multiple-channel output laser, because the luminescence unit of described laser array pumping is multiple, multichannel hot spot is radiated on laser crystal and laser crystal temperature will be caused too high, and the program is the heat-sinking capability in order to increase described laser crystal, specifically scheme is, reduces the doping content of described laser crystal, and reduces the thickness of described laser crystal.The heat-sinking capability of described laser crystal will be improved by the method reducing doping content and thickness.
Embodiment
The utility model provides a kind of multiple-channel output laser, and this laser can multiple-channel output red laser, blue laser or green laser etc., introduces the situation of multiple-channel output blue laser and multiple-channel output green laser in embodiment of the present utility model.
Please refer to Fig. 1, is the structural representation of the multiple-channel output laser that the utility model embodiment provides.
In the present embodiment, this multiple-channel output laser comprises pump light source, laser crystal 2, frequency-doubling crystal 3 and outgoing mirror 4, on the plane of incidence 6 of described laser crystal and on the plane of incidence 10 of described outgoing mirror, high anti-coating is all set, between two planes of incidence being provided with high anti-coating, forms resonant cavity.
Described pump light source is single bar bar semiconductor laser array 1.
Described single bar bar semiconductor laser array 1, laser crystal 2, frequency-doubling crystal 3 and outgoing mirror 4 are arranged in order in order, and are arranged in same light path.The light source that described single bar bar semiconductor laser array is launched, successively by laser crystal 2 and frequency-doubling crystal 3, is launched finally by outgoing mirror 4.
Described pump light source is the list bar bar semiconductor laser array 1 adopting 808nm, this list bar bar semiconductor laser array 1 comprises at least two luminous units, namely described pump light source can be launched on multichannel light source to described laser crystal 2, and according to the dispersion angle of every road light source, determine the distance between described pump light source and described laser crystal 2.
Because the angle of divergence of described semiconductor laser array transmitting illuminant is larger, so be close to an optical fibre microlens 5 on the surface of emission of described semiconductor laser array, the effect of this optical fibre microlens 5 is that the vertical direction angle of divergence of semiconductor laser array is reduced to 7 degree or less by 40 degree, the angle of divergence of parallel direction also can be controlled in the scope of 7 degree, the size of single luminous unit is about 100 microns * 100 microns, after propagating 0.2mm, the size of hot spot is 150 microns * 150 microns, after propagation 0.5mm, the size of hot spot is 220 microns * 220 microns, so the pump power density in order to ensure luminous point little on described laser crystal 2, distance controlling between needing semiconductor laser array to laser crystal 2 is in certain scope, this distance can be described as predeterminable range, the scope of described predeterminable range is generally arranged between 0.1mm to 1.5mm.
According to the result of many experiments data, preferably, in order to improve laser-conversion efficiency, the predeterminable range of described semiconductor laser array and described laser crystal 2 is 0.7mm.Under this predeterminable range, the spot size that the light that described luminous unit launches is formed on described laser crystal 2 and density are optimum state, and the power loss caused by the problem that the angle of divergence is large also can be reduced to minimum, therefore, under this predeterminable range, laser-conversion efficiency can be improved.
Multiple luminous unit on described single bar bar semiconductor laser array 1 arranges according to the mode of array, specifically, described luminous unit is arranged as a laser array according to the mode of longitudinal row and horizontal row respectively, and the distance between the adjacent luminous unit on described laterally row is called lateral separation, and the distance between the adjacent luminous unit on described longitudinal row is called longitudinal separation.
In order to ensure that the light that described laser array is launched is radiated on the described laser crystal 2 of institute equably, described lateral separation and described longitudinal separation can be set to identical interval, and the scope at this interval can be set as between 0.2mm-0.5mm.Excessive or the too small hot spot that all can affect of distance between luminous unit is radiated at density on described laser crystal 2, and preferably, this interval can be set as 0.3mm, and the distance namely between adjacent two luminous units is 0.3mm.
According to the arrangement mode of above-mentioned array, the quantity of the luminescence unit that can comprise in described laser array is 15-25, and preferably, the quantity of this luminescence unit can be set as 19, and the first exportable power bracket of each luminescence is 2W-3W.Because this laser is multiple-channel output, relative to the laser that single channel exports, exportable gross power is the power of single luminous unit and the product of luminescence unit quantity, and therefore, this multiple-channel output laser can improve power output.
This multiple-channel output laser improves power output to a certain extent, but the light that multiple luminous unit launches is radiated on described laser crystal 2, and the temperature of laser crystal 2 will inevitably be caused to raise, and therefore needs the problem solving the heat radiation of described laser crystal 2.
Described laser crystal 2 is the yttrium vanadate crystal of neodymium-doped or the gadolinium vanadate crystal of neodymium-doped, in order to increase the heat-sinking capability of described laser crystal 2, doping content generally by reducing the neodymium of the gadolinium vanadate crystal of described yttrium vanadate crystal or neodymium-doped realizes, the doping content of described neodymium is lower, then the heat-sinking capability of described laser crystal 2 is stronger.
The doping content scope of described neodymium is more than or equal to 0.1%, and be less than or equal to 0.5%.Preferably, the doping content of described neodymium can be set as 0.2%.This doping content equals about 1/5th of the doping content of the laser that single channel exports.
Except adopting the doping content of the described neodymium of above-mentioned reduction to improve except heat-sinking capability, heat-sinking capability can also be strengthened by the size of the described laser crystal 2 of adjustment.Therefore described laser crystal 2 can be set to flat crystal to increase the heat-sinking capability of described laser crystal 2.
The thickness of described laser crystal 2 can be arranged between 0.5mm-1.5mm, and preferably, the thickness of this laser crystal 2 is 1mm.In addition, the length range of described laser crystal 2 is between 2mm-10mm, and width range is between 7mm-12mm.Preferably, the length of described laser crystal 2 is 3mm or 5mm, and the width of described laser crystal 2 is 10mm.
Described laser crystal 2 itself has fixing gain bandwidth, irradiates by pump light source the wavelength that this laser crystal 2 can produce certain several wave band.The exit facet 7 of described laser crystal arranges the anti-reflection film of corresponding wave band, then the light emission of corresponding band wavelength can be made to go out.The laser that general Application comparison is general and conventional is blue laser and green laser, existing exit facet 7 coating introducing described laser crystal for blue laser and green laser.
For blue laser, its wavelength is generally 456nm.Because this multiple-channel output laser needs through frequency-doubling crystal 3 from the light that described laser crystal 2 is launched, therefore the wavelength after frequency-doubling crystal 3 is blue light wavelength 456nm, so require that the wavelength launched from described laser crystal 2 is 912nm, then only need plate one deck 912nm anti-reflection film on the exit facet 7 of described laser crystal.
For green laser, its wavelength is generally 532nm, and the frequency-doubled wavelength launched from described laser crystal 2 accordingly should be 1064nm, therefore, when making green (light) laser, needs the anti-reflection film plating one deck 1064nm on the exit facet 7 of described laser crystal.
Described frequency-doubling crystal 3 is a kind of nonlinear optical crystals for frequency-doubled effect.Utilize the matching principle that matches can produce the frequency-doubled wavelength of fundamental wave.
Described frequency-doubling crystal 3 can adopt any one in following crystal: PPLN, MgO:PPLN, MgO:PPSLN, PPLT, MgO:PPLT or MgO:PPSLT.
In order to improve the heat-sinking capability of described frequency-doubling crystal 3, this crystal can be set to flat crystal, such as the length range of described frequency-doubling crystal 3 is more than or equal to 2mm, and be less than or equal to 4mm; Width range is more than or equal to 8mm, and be less than or equal to 12mm; Thickness range is more than or equal to 0.5mm, and be less than or equal to 1.5mm.
Described outgoing mirror 4 is level crossing, with multiple-channel output while realizing laser.
Because blue laser and green laser are more extensive in actual applications, and blue laser and green (light) laser realize by increasing plating anti-reflection film on described laser crystal 2, and blue laser is different with the wavelength of the transmitting of green (light) laser, therefore, the rete also corresponding difference of plating on laser crystal 2, frequency-doubling crystal 3 and outgoing mirror 4.Each crystal increases the laser now introducing blue laser and green laser respectively the rete of plating.
The wavelength that blue laser is launched is 456nm.The plane of incidence 6 of the laser crystal of blue laser needs the anti-reflection film plating 808nm (wavelength of pump light), and the high-reflecting film of infrared light 912nm, the exit facet 7 of laser crystal plates the high-reflecting film of 912nm anti-reflection film and blue light 456nm; The described frequency-doubling crystal PPLN cycle is 4.2 microns of (polarization cycle demand fulfillment phase matched principles, and it is relevant with temperature with the refractive index of crystal, frequency-doubled wavelength, the cycle of PPLT is 4.8 microns, can be different from PPLN), the plane of incidence 8 of this frequency-doubling crystal and the exit facet 9 of frequency-doubling crystal need plating 912nm and 456nm anti-reflection film; The plane of incidence 10 of outgoing mirror needs plating 912nm high-reflecting film and 456nm anti-reflection film, and the exit facet 11 of outgoing mirror needs plating 456 anti-reflection film.
On the high-reflecting film of 912nm of plating on the plane of incidence 6 of described laser crystal and the plane of incidence 10 of outgoing mirror, the 912nm high-reflecting film of plating forms the resonant cavity of this blue laser, and the exit facet 11 of outgoing mirror plates 456 anti-reflection films blue laser can be made to launch.
The optical maser wavelength that green (light) laser is launched is 532nm.The plane of incidence 6 of the laser crystal of green (light) laser needs plating 808nm anti-reflection film, and the high-reflecting film of infrared light 1064nm, and the exit facet 7 of this laser crystal plates the anti-reflection and green glow 532nm high-reflecting film of 1064nm; The cycle of described frequency-doubling crystal PPLN is 7 microns, and the plane of incidence 8 of this frequency-doubling crystal and the exit facet 9 of frequency-doubling crystal plate 1064nm and 532nm anti-reflection film; The plane of incidence 10 of described outgoing mirror plates 1064nm high-reflecting film and 532nm anti-reflection film, and the exit facet 11 of this outgoing mirror plates 532nm anti-reflection film,
On the high-reflecting film of 1064nm of plating on the plane of incidence 6 of described laser crystal and the plane of incidence 10 of outgoing mirror, the 1064nm high-reflecting film of plating forms the resonant cavity of this green (light) laser, and the exit facet 11 of outgoing mirror plates 532 anti-reflection films green laser can be made to launch.
A kind of multiple-channel output laser that the utility model provides, the volume of this laser is little, compact conformation, and pump light source adopts multiple luminous unit, can reduce speckle phenomena on the one hand, can improve power output on the other hand.
This multiple-channel output laser is by adjusting the geomery of described laser crystal 2 and frequency-doubling crystal 3 in addition, adds the heat-sinking capability of described laser crystal 2 and frequency-doubling crystal 3, thus realizes the multiple-channel output of laser.
Although the utility model with preferred embodiment openly as above; but it is not for limiting the utility model; any those skilled in the art are not departing from spirit and scope of the present utility model; can make possible variation and amendment, the scope that therefore protection range of the present utility model should define with the utility model claim is as the criterion.