CN103441420A - Noncritical phase matching frequency-doubled purple light laser and fabrication method thereof - Google Patents
Noncritical phase matching frequency-doubled purple light laser and fabrication method thereof Download PDFInfo
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Abstract
The invention provides a noncritical phase matching frequency-doubled purple light laser, comprising a LaCOB frequency-doubled crystal, wherein the LaCOB is abbreviation of LaCa4O(BO3)3. Noncritical phase matching is utilized for frequency doubling of a commercial semiconductor (LD) laser with central wavelength of 808 plus or minus 5nm directly to obtain a high-power solid purple light laser with central wavelength of 405-407nm; the laser has the advantages of high conversion efficiency, low cost, compact structure, miniaturization, high reliability and long life. The purple light laser disclosed by the invention has a simple structure, stable performances and high conversion rate, as the frequency-doubling LaCOB crystal adopted by the laser is processed along the refractive index principal axis, and the noncritical phase matching technology of the LaCOB crystal is adopted, the laser stability and the laser efficiency are improved; other purple light lasers are not fabricated by adopting the noncritical phase matching technology of the nonlinear optical crystal through direct frequency doubling of LD.
Description
Technical field
The present invention relates to purple light laser of a kind of noncritical phase matching frequency multiplication and preparation method thereof, belong to the technical field of laser and device.
Background technology
Full solid-state bluish violet light laser, because of its extensive use in fields such as Laser Biomedicine, laser color demonstration, the storage of laser high density data, laser spectroscopy, laser printing, Laser Underwater imaging and communication, laser coolings, enjoys people to pay attention in recent years.At present, the approach that realizes full solid-state bluish violet look LASER Light Source mainly contains three kinds: (1) directly launches the laser diode of blue light; (2) blue-violet laser that LD pumped all-solid-state laser obtains by the nonlinear optics means again; (3) blue-violet light source of direct frequency doubling LD.Directly launch the semiconductor laser of blue light, there is simple in structure, easy to use, electrical-optical conversion efficiency advantages of higher, but because the defect of semi-conducting material itself is difficult to overcome, make the development of blue laser diode relatively slow, and also have a segment distance between practical.LD pumped all-solid-state laser obtains bluish violet color laser output by the nonlinear optics frequency inverted as methods such as frequency multiplication and frequencies again, and intermediate link is many, complicated integral structure, and reliability is relatively poor.By direct frequency doubling LD obtain bluish violet color laser have simple in structure, reliability is high, cost is low, conversion ratio is high, can realize high light-light conversion efficiency.Commercial LD technology develop rapidly recent years, its beam quality and power output all are improved, and the emission live width is compressed, and various novel frequency-doubling crystal quality improve constantly, and the blue-violet light source technology of direct frequency doubling LD obtains develop rapidly.The at present this technology that the infrared laser of LD pumping output direct frequency doubling is obtained to bluish violet color laser by second harmonic (SHG) has obtained application, but wherein the frequency-doubling crystal of key is limited.Mainly contain in the market the crystal such as three lithium borates (LBO), periodic polarized lithium niobate (PPLN) and periodic polarized KTP (PPKTP) and can realize the output of royal purple laser, it is larger that but its phase matched direction departs from the crystal optics main shaft, therefore bbo crystal fundamental frequency light and frequency doubled light deviation angle are large, fundamental frequency light allows that angle is little, can not utilize than long crystal and obtain high conversion ratio; PPLN and the growth of PPKTP crystal are slow, crystal processing and technology of preparing complexity, and fundamental frequency light allows that angle is little.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of purple light laser of noncritical phase matching frequency multiplication.Laser of the present invention, for utilizing the commercial semiconductor laser (LD, centre wavelength 808 ± 5nm) of its noncritical phase matching technology direct frequency doubling, obtains all solid laser of purple light (centre wavelength 405 ~ 407nm) output.That this purple light laser has is simple in structure, easy to use, good stability, cost is low, the life-span is long, volume is little, the conversion ratio advantages of higher, is conducive to royal purple laser developments and application.
The present invention also provides a kind of preparation method of purple light laser of above-mentioned noncritical phase matching frequency multiplication.
Technical scheme of the present invention is as follows:
The professional technique term:
1. phase matched (PM)
Fundamental frequency light is injected nonlinear optical crystal, produces the secondary polarized wave in each place of light path or claims the frequency multiplication light wave.Where the optical frequency electric field passes in crystal, will produce there second harmonic, dispersion due to crystal refractive index, the propagation velocity of the second harmonic of second harmonic emission is different from incident fundamental frequency velocity of wave propagation, the process that the second harmonic that different parts in crystal is not launched is in the same time propagated in crystal will interfere phenomenon, and relevant result is determining the output light intensity.Expect stronger second harmonic output, the necessary position of the second harmonic that different parts is not launched in crystal in the same time is consistent, reach this purpose, just require the fundamental frequency light of incident identical in the propagation velocity of crystal with second harmonic in the propagation velocity of crystal, thereby obtain stronger frequency doubled light output, the implication of phase matched that Here it is.
2. critical phase matched (CPM) noncritical phase matching (NCPM)
Noncritical phase matching (NCPM) refers to the axial phase matched of vertical light along the phase matched of refractive index major axes orientation to brilliant the referring to of single shaft for biaxal crystal, the phase matched of other situation is called critical phase matched (CPM).NCPM compares with CPM to have deviation angle and is zero, allows the advantage that angle is large, thereby is convenient to utilize than long crystal and obtains high conversion efficiency.
3.LaCOB frequency-doubling crystal refers at this fritter crystal processed along the frequency multiplication direction, the LaCOB crystal is the bulky crystal of not yet processing along the frequency multiplication direction.
Summary of the invention
The present invention relates to a kind of purple light laser of noncritical phase matching frequency multiplication, comprise the LaCOB frequency-doubling crystal.Described LaCOB is line borate oxygen lanthanum (LaCa
4o (BO
3)
3abbreviation.Semiconductor (LD) laser that the centre wavelength of utilizing its noncritical phase matching direct frequency doubling commercialization is 808 ± 5nm, obtain the high power purple light laser that centre wavelength 405 ~ 407nm exports, the purple light solid state laser.This laser has the advantages such as transformation efficiency is high, cost is low, compact conformation, miniaturization, reliability is high, the life-span is long.
The semiconductor laser technology that the business architecture wavelength is 808nm ± 5nm at present is comparative maturity, volume is little, lightweight, power consumption is little, be convenient to and coupling fiber, power output is more and more higher, can directly carry out intensity modulated and change the output wavelength of LD by temperature control.Utilize the commercial LD of NCPM technology direct frequency doubling of crystal, can obtain higher transformation efficiency, more stable laser, lead to the non-critical phase matching wavelength of light 813nm near at vertical Z X primary flat along Y-axis by calculating line borate oxygen lanthanum (LaCOB) crystal, and tested with optics parameter oscillation laser (OPO), discovery all observes the frequency multiplication purple light under fundamental frequency light 811nm ~ 815nm incident, the outgoing wavelength of business architecture wavelength 808nm ± 5nm semiconductor laser is transferred to 811nm ~ 813nm by method of temperature-control by, by designing suitable chamber mirror or crystal being led to the light end face coating, can realize LaCOB crystal noncritical phase matching direct frequency doubling LD under 20 ℃ of room temperatures, obtained 405 ~ 407nm purple light laser.
Detailed Description Of The Invention
A kind of purple light laser of noncritical phase matching frequency multiplication, comprise LD and LaCOB frequency-doubling crystal that center wavelength of light is 808 ± 5nm, the concrete corner cut of described LaCOB frequency-doubling crystal is (90 °, 90 °), above-mentioned corner cut is followed crystallographic international practice, the angle that previous angle is Z axis in space cut direction and space coordinates, the angle that a rear angle is the space cut direction projection in the XY plane and X-axis in space coordinates, wherein X-axis, Y-axis and Z axis are three-dimensional reference axis.Under the room temperature of 20 ℃, this LaCOB frequency-doubling crystal along the theoretical noncritical phase matching wavelength of Y direction near 813nm.The designed purple light laser of the present invention obtains with LaCOB direct frequency doubling commercialization 808 ± 5nm LD, and centre wavelength, near 405-407nm, is conducive to development and the industrialization of direct frequency doubling LD bluish violet light laser.
Preferred according to the present invention, described LD is pulse running LD or continuous operation LD, by the tuning center wavelength of light of being transferred to out of temperature control technique, is 811nm-813nm.
Preferred according to the present invention, the preparation method of described LaCOB frequency-doubling crystal: the LaCOB crystal is processed to the XZ twin polishing along optical main axis XYZ primary flat.Consider crystal orientation and mismachining tolerance, the corner cut of crystal is (90 ± 2 °, 90 ± 2 °).Here follow crystallographic international practice, the angle that previous angle is space cut direction and Z axis, a rear angle is the projection of space cut direction in the XY plane and the angle of X-axis.
Preferred according to the present invention, the preparation method of described LaCOB frequency-doubling crystal: by the LaCOB crystal along XYZ primary flat processing, the XZ mirror polish, LD sends the ZX primary flat that laser vertical that wavelength is 811-813nm is incident to the LaCOB frequency-doubling crystal, along the logical light of Y-axis.In the present invention, to the XZ mirror polish of LaCOB frequency-doubling crystal, the length that can increase LaCOB frequency-doubling crystal Y-axis reaches 20 ~ 30mm, improves transformation efficiency.
Preferred according to the present invention, the colour filter of filtering fundamental frequency light is set, the violet laser that to have to wavelength be 405-407nm at the exit end of described LaCOB frequency-doubling crystal.
Preferred according to the present invention, the preparation method of described LaCOB frequency-doubling crystal: the LaCOB crystal is processed along the XYZ primary flat, the XZ mirror polish, the laser that the laser that is 811-815nm at the anti-reflection wavelength of the plane of incidence of described LaCOB frequency-doubling crystal, high anti-wavelength are 405-408nm; The laser that the laser that is 405-408nm at the anti-reflection wavelength of the exit facet of described LaCOB frequency-doubling crystal, high anti-wavelength are 811-815nm.The advantage of design is herein, has improved the performance of purple light laser of the present invention.
Preferred according to the present invention, realize that at the plane of incidence of described LaCOB frequency-doubling crystal anti-reflection and high anti-method is: plated film on the described plane of incidence: 811-815nm anti-reflection film and 405-408nm high-reflecting film; Exit facet plated film at described LaCOB frequency-doubling crystal: 811-815nm high-reflecting film and 405-408nm anti-reflection film.
Preferred according to the present invention, realize that at the plane of incidence of described LaCOB frequency-doubling crystal anti-reflection and high anti-method is: arrange in described plane of incidence front portion that 811-815nm is anti-reflection, the high anti-lens of 405-408nm; High anti-, the anti-reflection mirror of 405-408nm of a 811-815nm is set at the exit facet rear portion.
The invention has the advantages that:
1, the purple laser of the present invention is simple in structure, stable performance, and conversion ratio is high.Because the double-frequency material LaCOB crystal that this laser adopts is along the refractive index spindle processing, the noncritical phase matching technology of application LaCOB crystal, can increase laser stability, improves efficiency of laser.Other purple laser does not utilize nonlinear optical crystal noncritical phase matching technology direct frequency doubling LD to obtain.
2, the purple laser of the present invention is to adopt the LD that direct frequency doubling business architecture wavelength is 808 ± 5nm to obtain, output wavelength 405-407nm is shorter than general royal purple laser, LD technology maturation, the power of commercial 808 ± 5nm is high, price is low, and the purple laser cost of the present invention is lower than other royal purple laser.
3, it is slow that the frequency-doubling crystal adopted on the royal purple laser market mainly contains the crystal growths such as three lithium borates (LBO), periodic polarized lithium niobate (PPLN) and periodic polarized KTP (PPKTP), processed complex, and cost is high.The LaCOB crystal that laser of the present invention adopts just can obtain large size single crystal with in the Czochralski grown short time, directly after spindle processing, do not need the extra electric field polarization just can use, the LaCOB hardness of crystals is large, stable in properties, be difficult for deliquescence, so the purple laser long service life of the present invention.
The accompanying drawing explanation
Fig. 1, LaCOB frequency-doubling crystal crystallographic axes a, b, c, refractive index major axis X, Y, Z and crystal face (201), (010), the structural representation of (202);
Fig. 2, LaCOB frequency-doubling crystal are along the machining sketch chart of refractive index main shaft;
The fiber-coupled LD of Fig. 3, LaCOB crystal direct frequency doubling output wavelength 811nm, LaCOB crystal both sides plated film;
The fiber-coupled LD of Fig. 4, LaCOB crystal direct frequency doubling output wavelength 811nm, place suitable lens before and after the LaCOB crystal.
Embodiment:
Below in conjunction with embodiment and Figure of description, the present invention is described in detail, but is not limited to this.
Embodiment 1,
A kind of purple light laser of noncritical phase matching frequency multiplication, comprise LD and LaCOB frequency-doubling crystal that center wavelength of light is 808 ± 5nm, the concrete corner cut of described LaCOB frequency-doubling crystal is (90 °, 90 °), above-mentioned corner cut is followed crystallographic international practice, the angle that previous angle is Z axis in space cut direction and space coordinates, the angle that a rear angle is the space cut direction projection in the XY plane and X-axis in space coordinates, wherein X-axis, Y-axis and Z axis are three-dimensional reference axis.Under the room temperature of 20 ℃, this LaCOB frequency-doubling crystal along the theoretical noncritical phase matching wavelength of Y direction near 813nm.The designed purple light laser of the present invention obtains with LaCOB direct frequency doubling commercialization 808 ± 5nm LD, and centre wavelength, near 405-407nm, is conducive to development and the industrialization of direct frequency doubling LD bluish violet light laser.Described LD is pulse running LD or continuous operation LD, by the tuning center wavelength of light of being transferred to out of temperature control technique, is 811nm-813nm.
Embodiment 2,
A kind of purple light laser of noncritical phase matching frequency multiplication as described in Example 1, its difference is, the colour filter of filtering fundamental frequency light is set at the exit end of described LaCOB frequency-doubling crystal, the violet laser that to have to wavelength be 405-407nm.
Embodiment 3,
A kind of purple light laser of noncritical phase matching frequency multiplication as described in Example 1, its difference is, the preparation method of described LaCOB frequency-doubling crystal: the LaCOB crystal is processed along the XYZ primary flat, the XZ mirror polish, the laser that the laser that is 811-815nm at the anti-reflection wavelength of the plane of incidence of described LaCOB frequency-doubling crystal, high anti-wavelength are 405-408nm; The laser that the laser that is 405-408nm at the anti-reflection wavelength of the exit facet of described LaCOB frequency-doubling crystal, high anti-wavelength are 811-815nm.The advantage of design is herein, has improved the performance of purple light laser of the present invention.
Realize that at the plane of incidence of described LaCOB frequency-doubling crystal anti-reflection and high anti-method is: plated film on the described plane of incidence: 811-815nm anti-reflection film and 405-408nm high-reflecting film; Exit facet plated film at described LaCOB frequency-doubling crystal: 811-815nm high-reflecting film and 405-408nm anti-reflection film.
Embodiment 4,
A kind of purple light laser of noncritical phase matching frequency multiplication as described in Example 1, its difference is, at the plane of incidence of described LaCOB frequency-doubling crystal, realizes that anti-reflection and high anti-method is: arrange in described plane of incidence front portion that 811-815nm is anti-reflection, the high anti-lens of 405-408nm; High anti-, the anti-reflection mirror of 405-408nm of a 811-815nm is set at the exit facet rear portion.
Embodiment 5,
A kind of preparation method of purple light laser of noncritical phase matching frequency multiplication as described in Example 1, the preparation method who comprises the LaCOB frequency-doubling crystal: the LaCOB crystal is processed along the XYZ primary flat, the XZ mirror polish, LD sends the ZX primary flat that laser vertical that wavelength is 811-813nm is incident to the LaCOB frequency-doubling crystal, along the logical light of Y-axis.In the present invention, to the XZ mirror polish of LaCOB frequency-doubling crystal, the length that can increase LaCOB frequency-doubling crystal Y-axis reaches 20 ~ 30mm, improves transformation efficiency.Specifically as follows to the processing of LaCOB frequency-doubling crystal:
(1) after getting LaCOB crystal pulverize, by the powder x-ray diffraction method, carry out structure elucidation, obtain the LaCOB cell parameter and be: a=0.8168nm, b=1.6081nm, c=0.3630nm, β=101.2 ± 0.1 °, the angle of crystallographic axes a and c is 101.2 ± 0.1 °.The LaCOB crystal is made to (201) and (010) crystal face on X-ray orientation device, and angle of diffraction is respectively 30.9 °, 5.5 °, and take this crystal face as datum level, determines that the angle of (201) crystal face and crystallography c-axis is 57.7 ± 1 °; Adopt petrographic microscope, application interferes light extinction method to determine that the crystallographic axes (a, b and c) of LaCOB crystal and the angle of optical main axis (X, Y and Z) are (a, Z)=24.8 ± 1 °, (c, X)=13.4 ± 1 °; Crystal axis b and optical main axis Y are reverse;
(2) the definite optical main axis XYZ of (1) LaCOB crystal in step is processed, considered that the corner cut of crystal orientation processing time error frequency-doubling crystal device is (90 ± 2 ° 90 ± 2 °).Crystal prototype is of a size of: i*x*imm
3(x represents Y-direction length, 5≤x≤30; 4≤i≤10), by the two-sided finishing polish of XZ face, wherein the polishing degree 30 ' within, along the length of Y optical direction, be 5 ~ 10mm.I=5 herein.
(3) LaCOB crystal prototype step (2) obtained is put on special crystal fixture, adopts the temperature of the cooling control crystal of constant temperature water tank 20 ℃ of left and right.
(4) adopt the LD pumping of continuous wave output, the LD wavelength is transferred to by temperature control near 811nm ~ 813nm, adjusts chucking position, and the LD pump light is passed into along the crystal Y direction, filters fundamental frequency light with colour filter and just can obtain near the violet laser output of 405 ~ 407nm.
Embodiment 6,
A kind of preparation method of purple light laser of noncritical phase matching frequency multiplication as described in Example 1 comprises the preparation method of LaCOB frequency-doubling crystal:
(1) after getting LaCOB crystal pulverize, by the powder x-ray diffraction method, carry out structure elucidation, obtain the LaCOB cell parameter and be: a=0.8168nm, b=1.6081nm, c=0.3630nm, β=101.2 ± 0.1 °, the angle of crystallographic axes a and c is 101.2 ± 0.1 °.The LaCOB crystal is made to (202) and (010) crystal face on X-ray orientation device, and angle of diffraction is respectively 62.45 °, 5.5 °, and take this crystal face as datum level, determines that the angle of (202) crystal face and crystallography c-axis is 24 ± 1 °; Adopt petrographic microscope, application interferes light extinction method to determine that the crystallographic axes (a, b and c) of LaCOB crystal and the angle of optical main axis (X, Y and Z) are (a, Z)=24.8 ± 1 °, (c, X)=13.4 ± 1 °; Crystal axis b and optical main axis Y are reverse.
(2) LaCOB crystal in step (1) is processed with reference to definite optical main axis XYZ, considered that the corner cut of crystal orientation processing time error frequency-doubling crystal device is (90 ± 2 ° 90 ± 2 °).Crystal prototype is of a size of: i*x*imm
3(x represents Y-direction length, 5≤x≤30; 4≤i≤10),, by the two-sided finishing polish of XZ face, wherein the polishing degree 30 ' within, along the length of Y optical direction, be 10 ~ 20mm.I=5 herein.
(3) step (2) is obtained to the LaCOB crystal and be put on special crystal fixture, adopt the temperature of the cooling control crystal of constant temperature water tank 20 ℃ of left and right.
(4) the LD drive manner of laser of the present invention is pulse output, and the wavelength of LD is transferred to by temperature control near 811nm ~ 813nm, along the logical light of crystal Y direction, filters fundamental frequency light with colour filter and just can obtain near the violet laser of 405 ~ 407nm.
Embodiment 7,
A kind of preparation method of purple light laser of noncritical phase matching frequency multiplication as described in Example 1 comprises the preparation method of LaCOB frequency-doubling crystal:
(1) after getting LaCOB crystal pulverize, by the powder x-ray diffraction method, carry out structure elucidation, obtain the LaCOB cell parameter and be: a=0.8168nm, b=1.6081nm, c=0.3630nm, β=101.2 ± 0.1 °, the angle of crystallographic axes a and c is 101.2 ± 0.1 °.The LaCOB crystal is made to (201) and (010) crystal face on X-ray orientation device, and angle of diffraction is respectively 30.9 °, 5.5 °, and take this crystal face as datum level, determines that the angle of (201) crystal face and crystallography c-axis is 57.7 ± 1 °; Adopt petrographic microscope, application interferes light extinction method to determine that the crystallographic axes (a, b and c) of LaCOB crystal and the angle of optical main axis (X, Y and Z) are (a, Z)=24.8 ± 1 °, (c, X)=13.4 ± 1 °; Crystal axis b and optical main axis Y are reverse.
(2) LaCOB crystal in step (1) is processed with reference to definite optical main axis XYZ, considered that the corner cut of crystal orientation processing time error frequency-doubling crystal device is (90 ± 2 ° 90 ± 2 °).Crystal prototype is of a size of: i*x*imm
3(x represents Y-direction length, 5≤x≤30; 4≤i≤10), by the two-sided finishing polish of XZ face, wherein the polishing degree 30 ' within, along the length of Y optical direction, be 5 ~ 30mm.I=5 herein.
(3) LaCOB crystal ZX plane plated film step (2) obtained, high anti-at the anti-reflection 405-408nm of plane of incidence plated film 811-815nm, at the high anti-405-408nm of exit facet plated film 811-815nm, partly see through.
(4) step (3) is obtained to the LaCOB crystal and be put on suitable crystal fixture, adopt the temperature of the cooling control crystal of constant temperature water tank 20 ℃ of left and right.
(5) the LD drive manner of laser of the present invention is continuous wave output, and the wavelength of LD is transferred to by temperature control near 811nm ~ 813nm, along the logical light of crystal Y direction, filters fundamental frequency light with colour filter and just can obtain near the violet laser of 405 ~ 407nm.
Embodiment 8,
A kind of preparation method of purple light laser of noncritical phase matching frequency multiplication as described in Example 1 comprises the preparation method of LaCOB frequency-doubling crystal:
(1) after getting LaCOB crystal pulverize, by the powder x-ray diffraction method, carry out structure elucidation, obtain the LaCOB cell parameter and be: a=0.8168nm, b=1.6081nm, c=0.3630nm, β=101.2 ± 0.1 °, the angle of crystallographic axes a and c is 101.2 ± 0.1 °.The LaCOB crystal is made to (202) and (010) crystal face on X-ray orientation device, and angle of diffraction is respectively 62.45 °, 5.5 °, and take this crystal face as datum level, determines that the angle of (202) crystal face and crystallography c-axis is 24 ± 1 °; Adopt petrographic microscope, application interferes light extinction method to determine that the crystallographic axes (a, b and c) of LaCOB crystal and the angle of optical main axis (X, Y and Z) are (a, Z)=24.8 ± 1 °, (c, X)=13.4 ± 1 °; Crystal axis b and optical main axis Y are reverse.
(2) LaCOB crystal in step (1) is processed with reference to definite optical main axis XYZ, considered that the corner cut of crystal orientation processing time error frequency-doubling crystal device is (90 ± 2 ° 90 ± 2 °).Crystal prototype is of a size of: i*x*imm
3(x represents Y-direction length, 5≤x≤30; 4≤i≤10), by the two-sided finishing polish of XZ face, wherein the polishing degree 30 ' within, along the length of Y optical direction, be 10 ~ 20mm.I=5 herein.
(3) LaCOB crystal ZX plane plated film step (2) obtained, high anti-at the anti-reflection 405-408nm of plane of incidence plated film 811-815nm, at the high anti-405-408nm of exit facet plated film 811-815nm, partly see through.
(4) step (3) is obtained to the LaCOB crystal and be put on suitable crystal fixture, adopt the temperature of the cooling control crystal of constant temperature water tank 20 ℃ of left and right.
(5) the LD drive manner of laser of the present invention is pulse output, and the wavelength of LD is transferred to by temperature control near 811nm ~ 813nm, along the logical light of crystal Y direction, filters fundamental frequency light with colour filter and just can obtain near the violet laser of 405 ~ 407nm.
Embodiment 9,
A kind of preparation method of purple light laser of noncritical phase matching frequency multiplication as described in Example 1 comprises the preparation method of LaCOB frequency-doubling crystal:
(1) after getting LaCOB crystal pulverize, by the powder x-ray diffraction method, carry out structure elucidation, obtain the LaCOB cell parameter and be: a=0.8168nm, b=1.6081nm, c=0.3630nm, β=101.2 ± 0.1 °, the angle of crystallographic axes a and c is 101.2 ± 0.1 °.The LaCOB crystal is made to (201) and (010) crystal face on X-ray orientation device, and angle of diffraction is respectively 30.9 °, 5.5 °, and take this crystal face as datum level, determines that the angle of (201) crystal face and crystallography c-axis is 57.7 ± 1 °; The application petrographic microscope, adopting the crystallographic axes (a, b and c) of interfering light extinction method to determine the LaCOB crystal is (a, Z)=24.8 ± 1 ° with the angle of optical main axis (X, Y and Z), (c, X)=13.4 ± 1 °; Crystal axis b and optical main axis Y are reverse.
(2) LaCOB crystal in step (1) is processed with reference to definite optical main axis XYZ, considered that the corner cut of crystal orientation processing time error frequency-doubling crystal device is (90 ± 2 ° 90 ± 2 °).Crystal prototype is of a size of: i*x*imm
3(x represents Y-direction length, 5≤x≤30; 4≤i≤10), by the two-sided finishing polish of XZ face, wherein the polishing degree 30 ' within, along the length of Y optical direction, be 5 ~ 30mm.I=5 herein.
(3) LaCOB crystal ZX plane plated film step (2) obtained, high anti-at the anti-reflection 405-408nm of plane of incidence plated film 811-815nm, then the LaCOB crystal is put on suitable crystal fixture, adopt the temperature of the cooling control crystal of constant temperature water tank 20 ℃ of left and right, place the lens that the high anti-405-408nm of a 811-815nm partly sees through after LaCOB crystal exit facet.
(4) the LD drive manner of laser of the present invention is continuous wave output, and the wavelength of LD is transferred to by temperature control near 811nm ~ 813nm, along the logical light of crystal Y direction, filters fundamental frequency light with colour filter and just can obtain near the violet laser of 405 ~ 407nm.
Embodiment 10,
A kind of preparation method of purple light laser of noncritical phase matching frequency multiplication as described in Example 1 comprises the preparation method of LaCOB frequency-doubling crystal:
(1) after getting LaCOB crystal pulverize, by the powder x-ray diffraction method, carry out structure elucidation, obtain the LaCOB cell parameter and be: a=0.8168nm, b=1.6081nm, c=0.3630nm, β=101.2 ± 0.1 °, the angle of crystallographic axes a and c is 101.2 ± 0.1 °.The LaCOB crystal is made to (201) and (010) crystal face on X-ray orientation device, and angle of diffraction is respectively 30.9 °, 5.5 °, and take this crystal face as datum level, determines that the angle of (201) crystal face and crystallography c-axis is 57.7 ± 1 °; The application petrographic microscope, application interferes light extinction method to determine that the crystallographic axes (a, b and c) of LaCOB crystal and the angle of optical main axis (X, Y and Z) they are (a, Z)=24.8 ± 1 °, (c, X)=13.4 ± 1 °; Crystal axis b and optical main axis Y are reverse.
(2) LaCOB crystal in step (1) is processed with reference to definite optical main axis XYZ, considered that the corner cut of crystal orientation processing time error frequency-doubling crystal device is (90 ± 2 ° 90 ± 2 °).Crystal prototype is of a size of: i*x*imm
3(x represents Y-direction length, 5≤x≤30; 4≤i≤10),, by the two-sided finishing polish of XZ face, wherein the polishing degree 30 ' within, along the length of Y optical direction, be 5 ~ 30mm.I=5 herein.
(3) step (2) is obtained to the LaCOB crystal and be put on suitable crystal fixture, adopt the temperature of the cooling control crystal of constant temperature water tank 20 ℃ of left and right.
(4) the LD drive manner of laser of the present invention is continuous wave output, the wavelength of LD is transferred near 811nm ~ 813nm by temperature control, along the logical light of crystal Y direction, place the high anti-lens of the anti-reflection 405-408nm of 811-815nm before the crystal plane of incidence, place at exit facet the lens that the high anti-405-408nm of a 811-815nm partly sees through, filter fundamental frequency light with colour filter and just can obtain near the violet laser of 405 ~ 407nm.
Embodiment 11,
A kind of preparation method of purple light laser of noncritical phase matching frequency multiplication as described in Example 1 comprises the preparation method of LaCOB frequency-doubling crystal:
(1) after getting LaCOB crystal pulverize, by the powder x-ray diffraction method, carry out structure elucidation, obtain the LaCOB cell parameter and be: a=0.8168nm, b=1.6081nm, c=0.3630nm, β=101.2 ± 0.1 °, the angle of crystallographic axes a and c is 101.2 ± 0.1 °.The LaCOB crystal is made to (202) and (010) crystal face on X-ray orientation device, and angle of diffraction is respectively 62.45 °, 5.5 °, and take this crystal face as datum level, determines that the angle of (202) crystal face and crystallography c-axis is 24 ± 1 °; Adopt petrographic microscope, application interferes light extinction method to determine that the crystallographic axes (a, b and c) of LaCOB crystal and the angle of optical main axis (X, Y and Z) are (a, Z)=24.8 ± 1 °, (c, X)=13.4 ± 1 °; Crystal axis b and optical main axis Y are reverse.
(2) LaCOB crystal in step (1) is processed with reference to definite optical main axis XYZ, considered that the corner cut of crystal orientation processing time error frequency-doubling crystal device is (90 ± 2 ° 90 ± 2 °).Crystal prototype is of a size of: i*x*imm
3(x represents Y-direction length, 5≤x≤30; 4≤i≤10), by the two-sided finishing polish of XZ face, wherein the polishing degree 30 ' within, along the length of Y optical direction, be 10 ~ 20mm, i=8 described herein.
(3) step (2) is obtained to the LaCOB crystal and be put on suitable crystal fixture, adopt the temperature of the cooling control crystal of constant temperature water tank 20 ℃ of left and right.
(4) the LD drive manner of laser of the present invention is pulse output, the wavelength of LD is transferred near 811nm ~ 813nm by temperature control, along the logical light of crystal Y direction, place the high anti-lens of the anti-reflection 405-408nm of 811-815nm before the crystal plane of incidence, place at exit facet the lens that the high anti-405-408nm of a 811-815nm partly sees through, filter fundamental frequency light with colour filter and just can obtain near the violet laser of 405 ~ 407nm.
Claims (8)
1. the purple light laser of a noncritical phase matching frequency multiplication, it is characterized in that, this purple light laser comprises LD and the LaCOB frequency-doubling crystal that center wavelength of light is 808 ± 5nm, the concrete corner cut of described LaCOB frequency-doubling crystal is (90 °, 90 °), above-mentioned corner cut is followed crystallographic international practice, the angle that previous angle is Z axis in space cut direction and space coordinates, the angle that a rear angle is the space cut direction projection in the XY plane and X-axis in space coordinates, wherein X-axis, Y-axis and Z axis are three-dimensional reference axis.
2. the purple light laser of a kind of noncritical phase matching frequency multiplication according to claim 1, is characterized in that, described LD is pulse running LD or continuous operation LD, by the tuning center wavelength of light of being transferred to out of temperature control technique, is 811nm-813nm.
3. the purple light laser of a kind of noncritical phase matching frequency multiplication according to claim 1, is characterized in that, the preparation method of described LaCOB frequency-doubling crystal: the LaCOB crystal is processed to the XZ twin polishing along optical main axis XYZ primary flat.
4. the purple light laser of a kind of noncritical phase matching frequency multiplication according to claim 1, it is characterized in that, the preparation method of described LaCOB frequency-doubling crystal: the LaCOB crystal is processed along the XYZ primary flat, the XZ mirror polish, LD sends the ZX primary flat that laser vertical that wavelength is 811-813nm is incident to the LaCOB frequency-doubling crystal, along the logical light of Y-axis.
5. according to the purple light laser of the described a kind of noncritical phase matching frequency multiplication of claim 3 or 4, it is characterized in that, the colour filter of filtering fundamental frequency light is set at the exit end of described LaCOB frequency-doubling crystal, the violet laser that to have to wavelength be 405-407nm.
6. the purple light laser of a kind of noncritical phase matching frequency multiplication according to claim 1, it is characterized in that, the preparation method of described LaCOB frequency-doubling crystal: the LaCOB crystal is processed along the XYZ primary flat, the XZ mirror polish, the laser that the laser that is 811-815nm at the anti-reflection wavelength of the plane of incidence of described LaCOB frequency-doubling crystal, high anti-wavelength are 405-408nm; The laser that the laser that is 405-408nm at the anti-reflection wavelength of the exit facet of described LaCOB frequency-doubling crystal, high anti-wavelength are 811-815nm.
7. the purple light laser of a kind of noncritical phase matching frequency multiplication according to claim 6, it is characterized in that, realize that at the plane of incidence of described LaCOB frequency-doubling crystal anti-reflection and high anti-method is: plated film on the described plane of incidence: 811-815nm anti-reflection film and 405-408nm high-reflecting film; Exit facet plated film at described LaCOB frequency-doubling crystal: 811-815nm high-reflecting film and 405-408nm anti-reflection film.
8. the purple light laser of a kind of noncritical phase matching frequency multiplication according to claim 6, it is characterized in that, at the plane of incidence of described LaCOB frequency-doubling crystal, realize that anti-reflection and high anti-method is: arrange in described plane of incidence front portion that 811-815nm is anti-reflection, the high anti-lens of 405-408nm; High anti-, the anti-reflection mirror of 405-408nm of a 811-815nm is set at the exit facet rear portion.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109286080A (en) * | 2018-10-23 | 2019-01-29 | 北京无线电测量研究所 | A kind of polarization device |
| CN109659806A (en) * | 2019-02-22 | 2019-04-19 | 山东大学 | A kind of temperature-insensitive type frequency-doubling crystal device and its application |
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| US20020181514A1 (en) * | 2001-05-03 | 2002-12-05 | The Regents Of The University Of California | Electro-optic modulator material |
| CN102074887A (en) * | 2010-01-13 | 2011-05-25 | 山东大学 | Self-frequency conversion solid laser based on neodymium-doped gadolinium calcium oxide borate crystal |
| CN203521889U (en) * | 2013-09-25 | 2014-04-02 | 山东大学 | Noncritical phase matching frequency-doubled purple light laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020181514A1 (en) * | 2001-05-03 | 2002-12-05 | The Regents Of The University Of California | Electro-optic modulator material |
| CN102074887A (en) * | 2010-01-13 | 2011-05-25 | 山东大学 | Self-frequency conversion solid laser based on neodymium-doped gadolinium calcium oxide borate crystal |
| CN203521889U (en) * | 2013-09-25 | 2014-04-02 | 山东大学 | Noncritical phase matching frequency-doubled purple light laser |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109286080A (en) * | 2018-10-23 | 2019-01-29 | 北京无线电测量研究所 | A kind of polarization device |
| CN109659806A (en) * | 2019-02-22 | 2019-04-19 | 山东大学 | A kind of temperature-insensitive type frequency-doubling crystal device and its application |
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