CN104283103A - Optical parametric oscillator capable of outputting wide-waveband and tunable continuous waves with wave length of 530-780 nm - Google Patents
Optical parametric oscillator capable of outputting wide-waveband and tunable continuous waves with wave length of 530-780 nm Download PDFInfo
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- CN104283103A CN104283103A CN201410486246.4A CN201410486246A CN104283103A CN 104283103 A CN104283103 A CN 104283103A CN 201410486246 A CN201410486246 A CN 201410486246A CN 104283103 A CN104283103 A CN 104283103A
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Abstract
The invention provides an optical parametric oscillator capable of outputting wide-waveband and tunable continuous waves with a wave length of 530-780 nm. A semi-conductor laser array drives an infrared laser light source, frequency doubling is carried out on the infrared laser light source so that short-wave-length visible laser can be generated, the optical parametric oscillator is further driven to carry out frequency doubling, so that visible laser output in a wide tuning range can be generated in a full solid-state module situation, and the laser system is feasible in medical application and scientific research in terms of cost, size, reliability, stability and durability. According to the technical scheme, on the premise that a system threshold value can be reduced, conversion efficiency from near-infrared light to visible light is improved and cost is reduced, wide-waveband and tunable continuous wave visible light output is achieved, and the spectral range covers 530-780 nm.
Description
Technical field
The invention belongs to photoelectron and laser technology field, relate to a kind of all-solid-state continuous wave visible ray broadband tunable optical parametric oscillator laser, it is applicable to the application in the fields such as laser medicine, medical science micro-imaging, laser spectroscopy, precision optics measurement and scientific research.
Background technology
The laser of visible light wave range has important using value in fields such as spectrum analysis, quantum mechanics, information processing, atomic physics, Biologic Medical Image, ultrahigh resolution microscope and medical treatment.Especially because the deoxyhemoglobin in blood reaches molar extinction coefficient peak value at 580nm place, and oxyhemoglobin reaches peak value at 550nm and 600nm place; Melanin in skin mesocuticle layer also has stronger absorption to 530 ~ 780nm wave band; Water is almost transparent for 530 ~ 780nm wave band; 618 ~ 780nm wave band is in biological organism optical window (618 ~ 1316nm) scope just, therefore, for the repercussion study etc. of biomedical imaging, laser medicine and light and biological tissue is applied, selection is positioned at the suitable continuous wave laser light source of 530 ~ 780nm wave-length coverage, for raising image quality, therapeutic efficiency, penetration depth and the photic tissue damage of reduction, there is very important meaning.At present, the laser of visible light wave range directly exports primarily of lasers such as semiconductor laser, solid state laser, gas laser, dye laser and fiber lasers, or realize exporting by frequency multiplication and the nonlinear frequency transformation technology such as frequency and difference frequency, but these lasers and technological means can only obtain the output of some specific wavelength laser.The output spectrum scope of what wherein output wavelength tunable range was wider mix ti sapphire laser also can only reach 660 ~ 1180nm, can not covering visible light 530 ~ 660nm wave band.Second nonlinear optic mixing is utilized to realize the optical parametric oscillator tuning range of optical frequency conversion very wide, can from ultraviolet to far infrared, compensate for the defect that common lasers and frequency multiplication thereof can only export some specific wavelength laser, is the important channel obtaining tunable, the high coherent radiation light source of broadband and new wave band of laser system.Optical parametric oscillator to be succeeded application in middle-infrared band, but less at the open report of visible light wave range, and major part concentrates on pulse pump drive manner.The optical parametric oscillator of continuous wave pumping has higher oscillation threshold relative to other drive manners, need the pump power that pumping source can provide higher, and nonlinear crystal also will possess larger non linear coefficient, so Continuous-Wave Optical Parametric Oscillator is all more difficult than the realization of other drive manner optical parametric oscillators.
Summary of the invention
The deficiency of the tunable continuous-wave laser of broadband is lacked in order to overcome existing visible light wave range, the invention provides a kind of Continuous-Wave Optical Parametric Oscillator system, this Continuous-Wave Optical Parametric Oscillator system can export broadband tunable laser within the scope of visible light wave range.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions:
Broadband tunable continuous wave 530-780nm optical parametric oscillator, comprises the pump laser be successively set in light path, light beam coupling system I, input mirror I, laser crystal, speculum I, frequency doubling nonlinear crystal I, outgoing mirror I, speculum II, light beam coupling system II, input mirror II, optical parametric oscillator nonlinear crystal, speculum III, speculum IV, optical parametric oscillator-frequency doubling nonlinear crystal II, outgoing mirror II, described input mirror I, speculum I and outgoing mirror I forms the resonant cavity of short wavelength laser, light beam coupling system I is between pump laser and input mirror I, the described central axis of light beam coupling system I overlaps with the light direction of pump laser, laser crystal is between input mirror I and speculum I, frequency doubling nonlinear crystal I between speculum I and outgoing mirror I, described input mirror II, speculum III, speculum IV, outgoing mirror II, form the resonant cavity of visible light optical parametric oscillator, light beam coupling system II is between speculum II and input mirror II, the central axis of described light beam coupling system II overlaps with speculum II reverberation direction, optical parametric oscillator nonlinear crystal is between input mirror II and speculum III, and optical parametric oscillator-frequency doubling nonlinear crystal II is between speculum IV and outgoing mirror II,
The pumping laser that pump laser is launched is incident to input mirror I after light beam coupling system I, through input mirror I through pumping laser be incident to laser crystal, described pumping laser is converted to near-infrared laser by laser crystal, speculum I is incident to from the near-infrared laser of laser crystal outgoing, the near-infrared laser reflected through speculum I is incident to frequency doubling nonlinear crystal I, described near-infrared laser is converted to short-wavelength visible light laser by frequency doubling nonlinear crystal I, outgoing mirror I is incident to from the short-wavelength visible light laser of frequency doubling nonlinear crystal I outgoing, the near-infrared laser transmitted from frequency doubling nonlinear crystal I is incident to frequency doubling nonlinear crystal I again through outgoing mirror I reflection, near-infrared laser through frequency doubling nonlinear crystal I transmission is incident to speculum I, the near-infrared laser reflected through speculum I is incident to input mirror I and continues vibration in resonant cavity, short-wavelength visible light laser through outgoing mirror I outgoing is incident to speculum II, the shortwave light laser reflected through speculum II is incident to light beam coupling system II, through light beam coupling system II through shortwave light laser be incident to input mirror II, shortwave light laser through input mirror II transmission is incident to optical parametric oscillator nonlinear crystal, shortwave light laser is converted to broadband near-infrared laser by optical parametric oscillator nonlinear crystal, the shortwave light laser transmitted from optical parametric oscillator nonlinear crystal is transmitted to resonant cavity through speculum III, speculum III is incident to from the broadband near-infrared laser of optical parametric oscillator nonlinear crystal outgoing, the broadband near-infrared laser reflected through speculum III is incident to optical parametric oscillator-frequency doubling nonlinear crystal II, broadband near-infrared laser is converted to broadband visible light laser by optical parametric oscillator-frequency doubling nonlinear crystal II, be incident to outgoing mirror II from the broadband visible light laser of optical parametric oscillator-frequency doubling nonlinear crystal II outgoing and be transmitted to optical parametric oscillator-frequency multiplication resonant cavity through outgoing mirror II, outgoing mirror II is incident to from the broadband near-infrared laser of optical parametric oscillator-frequency doubling nonlinear crystal II transmission, the broadband near-infrared laser reflected through outgoing mirror II is incident to input mirror II and continues vibration in optical parametric oscillator-frequency multiplication resonant cavity.
Further, described pump laser is semiconductor laser, and the centre wavelength of described laser is 800-900nm.
Further, described light beam coupling system I is at least one in geometry coupling system, spectrum coupled system; Described light beam coupling system I is at least one in lens, spatial filter, optical isolator, grating, multimode fiber.
Further, described input mirror I is coated with 800-900nm anti-reflection film towards the plane of light beam coupling system I, and described input mirror I another side is coated with 800-900nm anti-reflection film and 400-540nm and 1 μm high-reflecting film; Described speculum I is coated with 400-540nm and 1 μm high-reflecting film towards the minute surface of short-wavelength visible light laserresonator; Described outgoing mirror I is coated with the anti-reflection and 1 μm of high-reflecting film of 400-540nm towards the minute surface of short-wavelength visible light laserresonator, the another side plating 400-540nm anti-reflection film of described outgoing mirror I.
Further, described laser crystal is Nd ion doped monocrystalline or pottery, and the shape of laser crystal is any one in cylindrical, slab, hexahedron, waveguide shape, disc type, optical fiber shape; It is anti-reflection that two logical light faces of described laser crystal are coated with 400-540nm, and 800-900nm is anti-reflection and 1 μm of anti-reflection film.
Further, described frequency doubling nonlinear crystal I is any one in potassium niobate, barium metaborate, bismuth boracic acid, three lithium borates, potassium niobate, potassium titanium oxide phosphate, periodic polarized lithium niobate, periodic polarized potassium titanyl oxygenic phosphate(KTP) crystal; It is anti-reflection that two logical light faces of described frequency doubling nonlinear crystal I are coated with 400-540nm, and 800-900nm is anti-reflection and 1 μm of anti-reflection film.
Further, described speculum II is coated with 400-540nm high-reflecting film towards the minute surface of outgoing mirror I; Described light beam coupling system II is at least one in geometry coupling system, spectrum coupled system; Described light beam coupling system II is at least one in lens, spatial filter, optical isolator, half-wave plate, grating, multimode fiber.
Further, described input mirror II is coated with 400-540nm anti-reflection film towards the minute surface of light beam coupling system II, and described input mirror II another side is coated with 400-540nm anti-reflection film and near-infrared high-reflecting film; Described speculum III is coated with 400-540nm fractional transmission and near-infrared high-reflecting film towards the minute surface inside resonant cavity; Described speculum IV is coated with 400-540nm fractional transmission and near-infrared high-reflecting film towards the minute surface inside resonant cavity; Described outgoing mirror II is coated with near-infrared fractional transmission and 530-800nm anti-reflection film towards the minute surface inside resonant cavity, and the another side of described outgoing mirror II is coated with the anti-reflection and 530-800nm anti-reflection film of near-infrared.
Further, described optical parametric oscillator nonlinear crystal is any one in monolithic crystal, polylith cascade; Described optical parametric oscillator nonlinear crystal is any one in periodic polarized stoichiometric lithium tantalate, periodic polarized lithium niobate, periodic polarized doped with magnesia lithium niobate, periodic polarized potassium titanium oxide phosphate, periodic polarized arsenic acid titanyl rubidium; Two logical light faces of described optical parametric oscillator nonlinear crystal are coated with the anti-reflection and near-infrared anti-reflection film of 400-540nm; Described optical parametric oscillator nonlinear crystal adopts quasi-phase matched mode; Described optical parametric oscillator nonlinear crystal is any one in room temperature, temperature controlling stove temperature control state.
Further, described optical parametric oscillator-frequency doubling nonlinear crystal II is any one in potassium niobate, barium metaborate, bismuth boracic acid, three lithium borates, potassium niobate, potassium titanium oxide phosphate, periodic polarized lithium niobate, periodic polarized potassium titanyl oxygenic phosphate(KTP) crystal; Two logical light faces of described optical parametric oscillator-frequency doubling nonlinear crystal II are coated with the anti-reflection and near-infrared anti-reflection film of 400-800nm.
The invention has the beneficial effects as follows:
Broadband of the present invention tunable continuous wave 530-780nm visible light optical parametric oscillator adopts the mode such as structure of whole solid state, short-wavelength visible light pumping resonant cavity intracavity frequency doubling, can export to obtaining broadband tunable continuous wave visible ray when visible ray conversion efficiency, minimizing cost at reduction system thresholds, raising near-infrared, spectral region covers 530-780nm.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Number in the figure illustrates: 1. pump laser, 2. light beam coupling system I, 3. inputs mirror I, 4. laser crystal, 5. speculum I, 6. frequency doubling nonlinear crystal I, 7. outgoing mirror I, 8. speculum II, 9. light beam coupling system II, 10. input mirror II, 11. optical parametric oscillator nonlinear crystals, 12. speculum III, 13. speculum IV, 14. optical parametric oscillators-frequency doubling nonlinear crystal II, 15. outgoing mirror II.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
Can not the problem of covering visible light wave band in order to solve laser output wavelength tuning range, embodiments provide a kind of broadband tunable continuous wave 530-780 nm visible light optical parametric oscillator system, the present invention is by short-wavelength visible light laser pumping quasi-phase matched optical parametric oscillator, and then the output of frequency multiplication acquisition visible light lasers is carried out to its ideler frequency light, the benefit done like this is: structure of whole solid state makes laser compact, stable, quasi-phase matched can utilize the maximum non linear coefficient of nonlinear crystal, and the power density of ideler frequency light in chamber can be regulated, make it shg efficiency and reach maximum, thus improve total conversion efficiency, obtain the tunable continuous wave visible light lasers of broadband by multiple tuning manner to export simultaneously, the present invention will be described in more detail for following preferred embodiment:
With reference to shown in Fig. 1, the tunable visible light optical parametric oscillator-frequency multiplication of broadband comprises the pump laser 1 be successively set in light path, light beam coupling system I2, input mirror I3, laser crystal 4, speculum I5, frequency doubling nonlinear crystal I6, outgoing mirror I7, speculum II8, light beam coupling system II9, input mirror II10, optical parametric oscillator nonlinear crystal 11, speculum III12, speculum IV13, optical parametric oscillator-frequency doubling nonlinear crystal II14, outgoing mirror II15, described input mirror I3, speculum I5 and outgoing mirror I7 forms the resonant cavity of short wavelength laser, light beam coupling system I2 is between pump laser 1 and input mirror I3, the central axis of described light beam coupling system I2 overlaps with the light direction of pump laser 1, laser crystal 4 is between input mirror I3 and speculum I5, frequency doubling nonlinear crystal I6 between speculum I5 and outgoing mirror I7, described input mirror II10, speculum III12, speculum IV13, outgoing mirror II15, form the resonant cavity of visible light optical parametric oscillator, light beam coupling system II9 is between speculum II8 and input mirror II10, the central axis of described light beam coupling system II9 overlaps with speculum II8 reverberation direction, optical parametric oscillator nonlinear crystal 11 is between input mirror II10 and speculum III12, and optical parametric oscillator-frequency doubling nonlinear crystal II14 is between speculum IV13 and outgoing mirror II15.
In the present embodiment, during specific implementation, pump laser 1 is semiconductor laser, its centre wavelength be 808nm, 808nm laser through core diameter 200 μm, the energy-transmission optic fibre of numerical aperture 0.22 transfers to light beam coupling system I2.Light beam coupling system I2 is two panels focal length is 40mm, and plane and curved surface are all coated with the geometry coupling system of the planoconvex spotlight composition of 808nm anti-reflection film (transmitance is greater than 99%), 808nm laser coupled can be focused in short-wavelength visible light laserresonator.
Laserresonator forms by inputting mirror I3, speculum I5 and outgoing mirror I7, wherein, the plano-concave mirror of input mirror I3 to be radius of curvature be 200mm, plane towards light beam coupling system I2 is coated with 808nm anti-reflection film, and the one side towards resonant cavity is coated with 808nm anti-reflection film (transmitance is greater than 99%) and 532nm and 1064nm high-reflecting film (reflectivity is greater than 99.8%); Speculum I5 is level crossing, and the minute surface towards resonant cavity is coated with 532nm and 1064nm high-reflecting film; The plano-concave mirror of outgoing mirror I7 to be radius of curvature be 200mm, the minute surface towards short wavelength's resonant cavity is coated with the anti-reflection and 1064nm high-reflecting film of 532nm, another side plating 532nm anti-reflection film.Laser crystal 4 is placed between input mirror I3 and speculum I5, and for slab doping content is the bonding Nd:YVO4 crystal of 1%, crystalline size is 3 × 3 × (2+10) mm, and it is anti-reflection that the logical light face at crystal two ends is coated with 532nm, and 808nm is anti-reflection and 1064nm anti-reflection film; 808nm pump light, by producing 1064nm laser after laser crystal, adopts bonded crystals effectively can reduce the thermal lensing effect of crystal.Frequency doubling nonlinear crystal I6 is placed between speculum I5 and outgoing mirror I7, for slab lithium triborate crystal, crystalline size is 3 × 3 × 10mm, cutting angle is that 11.4o two ends lead to light face and are all coated with 532nm, 808nm and 1064nm anti-reflection film, 1064nm laser, through lithium triborate crystal, is converted to 532nm laser by I type-Ⅱphase matching.
Speculum II8 is level crossing, and the minute surface towards outgoing mirror I7 is coated with 532nm high-reflecting film, and by the 532nm laser reflection that exports through outgoing mirror I7 to light beam coupling system II9.Light beam coupling system II9 is the lens of focal length 70mm and the geometry coupling system of half-wave plate composition, can swash polarisation of light and coupling light spot diameter by control 532nm, realize the pattern matching with oscillation light.
Input mirror II10, speculum III12, speculum IV13 and outgoing mirror II15 form optical parametric oscillator and frequency multiplication resonant cavity thereof.Wherein, input mirror II10 is plano-concave mirror, radius of curvature is 200mm, and the minute surface towards light beam coupling system II9 is coated with 532nm anti-reflection film (transmitance is greater than 96%), and another side is coated with 532nm anti-reflection film (transmitance is greater than 96%) and 800-1560nm high-reflecting film (reflectivity is greater than 99.8%); Speculum III12 is plano-concave mirror, and radius of curvature is 200mm, and is coated with 532nm fractional transmission (transmitance is greater than 90%) and 800-1560nm high-reflecting film towards the minute surface inside resonant cavity; Speculum IV13 is level crossing, is coated with 800-1560nm high-reflecting film towards the minute surface inside resonant cavity; Outgoing mirror II15 is that level crossing is coated with 1060-1560nm fractional transmission (transmitance is greater than 90%) and 530-800nm anti-reflection film (transmitance is greater than 98%) towards the minute surface inside resonant cavity, and another side is coated with the anti-reflection and 530-800nm anti-reflection film (transmitance is greater than 98%) of 1060-1560nm.
Optical parametric oscillator nonlinear crystal 11 is monolithic multicycle periodic polarized stoichiometric proportion doped with magnesia lithium tantalate, crystal specification is 0.5 × 8.2 × 30mm, polarization cycle is 8.0-8.7 μm, number of cycles is 12, crystal two ends lead to light face and are coated with the anti-reflection and 800-1560nm anti-reflection film (transmitance is greater than 98%) of 532nm, and optical parametric oscillator adopts quasi-phase matched mode and the cycle tuning combination tunable technology combined with thermal tuning.
Optical parametric oscillator-frequency doubling nonlinear crystal II14 is periodic polarized lithium columbate crystal, crystal specification is 0.5 × 12 × 40mm, polarization cycle is 6.5-21.2 μm, number of cycles is 32, and the logical light face at crystal two ends is coated with the anti-reflection and 800-1560nm anti-reflection film (transmitance is greater than 98%) of 400-800nm.
Principle of the present invention:
Pump laser 1 output wavelength is the laser of 800-900nm wave band, described pumping laser enters by input mirror I3 after light beam coupling system I2, speculum I5, the short-wavelength visible light laserresonator that outgoing mirror I7 is formed, described pumping laser passes through input mirror I3 successively in short-wavelength visible light laserresonator, laser crystal 4, speculum I5, frequency doubling nonlinear crystal I6 and outgoing mirror I7, laser crystal 4 produces near-infrared laser under the effect of pumping laser, and described near-infrared laser enters frequency doubling nonlinear crystal I6 through speculum I5 reflection, frequency doubling nonlinear crystal I6 produces short-wavelength visible light laser under the effect of near-infrared laser, described short-wavelength visible light laser is transmitted to outside short-wavelength visible light laserresonator through outgoing mirror I7, simultaneously the near-infrared laser that transmits through frequency doubling nonlinear crystal I6 of part is through outgoing mirror I7, speculum I5 and input mirror I3 reflection, in the cavity oscillations of short-wavelength visible light laser resonance, the described short-wavelength visible light laser be transmitted to outside short-wavelength visible light laserresonator reflexes to light beam coupling system II9 through speculum speculum II8, after light beam coupling system II9, short-wavelength visible light laser enters into by input mirror II10, speculum III12, optical parametric oscillator-frequency multiplication resonant cavity that speculum IV13 and outgoing mirror II15 forms, described short-wavelength visible light laser being transmitted to successively outside optical parametric oscillator-frequency multiplication resonant cavity in optical parametric oscillator-frequency multiplication resonant cavity after optical parametric oscillator nonlinear crystal 11 and speculum III12, optical parametric oscillator nonlinear crystal 11 produces the tunable near-infrared laser of broadband under the effect of short-wavelength visible light laser, the tunable near-infrared laser of described broadband successively speculum III12 and speculum IV13 reflects, optical parametric oscillator-frequency doubling nonlinear crystal II14 transmission, and outgoing mirror II15 and input mirror II10 reflects, vibrate in optical parametric oscillator-frequency multiplication resonant cavity, optical parametric oscillator-frequency doubling nonlinear crystal II14 produces the tunable visible light lasers of broadband under the effect of the tunable near-infrared laser of broadband, the tunable visible light lasers of described broadband is transmitted to outside optical parametric oscillator-frequency multiplication resonant cavity through outgoing mirror II15.
Shortwave light pump optical parametric oscillator, and interior while ideler frequency optical power density in raising optical parametric oscillator resonant cavity frequency multiplication is carried out to it, obtain the tunable visible light lasers of high efficiency continuous wave broadband and export.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the invention described above embodiment, just to describing, does not represent the quality of embodiment.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. broadband tunable continuous wave 530-780nm optical parametric oscillator, is characterized in that, comprises the pump laser (1) be successively set in light path, light beam coupling system I(2), input mirror I(3), laser crystal (4), speculum I(5), frequency doubling nonlinear crystal I(6), outgoing mirror I(7), speculum II(8), light beam coupling system II(9), input mirror II(10), optical parametric oscillator nonlinear crystal (11), speculum III(12), speculum IV(13), optical parametric oscillator-frequency doubling nonlinear crystal II(14), outgoing mirror II(15), described input mirror I(3), speculum I(5) and outgoing mirror I(7) form the resonant cavity of short wavelength laser, described light beam coupling system I(2) central axis overlap with the light direction of pump laser (1), described input mirror II(10), speculum III(12), speculum IV(13), outgoing mirror II(15) form the resonant cavity of visible light optical parametric oscillator, described light beam coupling system II(9) central axis and speculum II(8) reverberation direction overlaps,
The pumping laser that described pump laser (1) is launched is through light beam coupling system I(2) after be incident to input mirror I(3), through input mirror I(3) through pumping laser be incident to laser crystal (4), described pumping laser is converted to near-infrared laser by laser crystal (4), speculum I(5 is incident to) from the near-infrared laser of laser crystal (4) outgoing, through speculum I(5) near-infrared laser that reflects is incident to frequency doubling nonlinear crystal I(6), frequency doubling nonlinear crystal I(6) described near-infrared laser is converted to short-wavelength visible light laser, from frequency doubling nonlinear crystal I(6) the short-wavelength visible light laser of outgoing is incident to outgoing mirror I(7), from frequency doubling nonlinear crystal I(6) near-infrared laser that transmits is through outgoing mirror I(7) reflection is incident to frequency doubling nonlinear crystal I(6 again), through frequency doubling nonlinear crystal I(6) near-infrared laser of transmission is incident to speculum I(5), through speculum I(5) near-infrared laser that reflects is incident to input mirror I(3) and vibration is continued in resonant cavity, through outgoing mirror I(7) the short-wavelength visible light laser of outgoing is incident to speculum II(8), through speculum II(8) the shortwave light laser that reflects is incident to light beam coupling system II(9), through light beam coupling system II(9) through shortwave light laser be incident to input mirror II(10), through input mirror II(10) the shortwave light laser of transmission is incident to optical parametric oscillator nonlinear crystal (11), shortwave light laser is converted to broadband near-infrared laser by optical parametric oscillator nonlinear crystal (11), the shortwave light laser transmitted from optical parametric oscillator nonlinear crystal (11) is through speculum III(12) be transmitted to resonant cavity, speculum III(12 is incident to) from the broadband near-infrared laser of optical parametric oscillator nonlinear crystal (11) outgoing, through speculum III(12) the broadband near-infrared laser that reflects is incident to optical parametric oscillator-frequency doubling nonlinear crystal II(14), optical parametric oscillator-frequency doubling nonlinear crystal II(14) broadband near-infrared laser is converted to broadband visible light laser, from optical parametric oscillator-frequency doubling nonlinear crystal II(14) the broadband visible light laser of outgoing is incident to outgoing mirror II(15) and through outgoing mirror II(15) be transmitted to optical parametric oscillator-frequency multiplication resonant cavity, from optical parametric oscillator-frequency doubling nonlinear crystal II(14) the broadband near-infrared laser of transmission is incident to outgoing mirror II(15), through outgoing mirror II(15) the broadband near-infrared laser that reflects is incident to input mirror II(10) and vibration is continued in optical parametric oscillator-frequency multiplication resonant cavity.
2. broadband according to claim 1 tunable continuous wave 530-780nm optical parametric oscillator, is characterized in that, described pump laser (1) is semiconductor laser, and the centre wavelength of described laser is 800-900nm.
3. broadband according to claim 1 tunable continuous wave 530-780nm optical parametric oscillator, is characterized in that, described light beam coupling system I(2) be at least one in geometry coupling system, spectrum coupled system; Described light beam coupling system I(2) be at least one in lens, spatial filter, optical isolator, grating, multimode fiber.
4. broadband according to claim 1 tunable continuous wave 530-780nm optical parametric oscillator, it is characterized in that, described input mirror I(3) towards light beam coupling system I(2) plane be coated with 800-900nm anti-reflection film, described input mirror I(3) another side is coated with 800-900nm anti-reflection film and 400-540nm and 1 μm high-reflecting film; Described speculum I(5) be coated with 400-540nm and 1 μm high-reflecting film towards the minute surface of short-wavelength visible light laserresonator; Described outgoing mirror I(7) be coated with the anti-reflection and 1 μm of high-reflecting film of 400-540nm towards the minute surface of short-wavelength visible light laserresonator, described outgoing mirror I(7) another side plating 400-540nm anti-reflection film.
5. broadband according to claim 1 tunable continuous wave 530-780nm optical parametric oscillator, it is characterized in that, described laser crystal (4) is Nd ion doped monocrystalline or pottery, and the shape of laser crystal (4) is any one in cylindrical, slab, hexahedron, waveguide shape, disc type, optical fiber shape; It is anti-reflection that two logical light faces of described laser crystal (4) are coated with 400-540nm, and 800-900nm is anti-reflection and 1 μm of anti-reflection film.
6. broadband according to claim 1 tunable continuous wave 530-780nm optical parametric oscillator, it is characterized in that, described frequency doubling nonlinear crystal I(6) be any one in potassium niobate, barium metaborate, bismuth boracic acid, three lithium borates, potassium niobate, potassium titanium oxide phosphate, periodic polarized lithium niobate, periodic polarized potassium titanyl oxygenic phosphate(KTP) crystal; Described frequency doubling nonlinear crystal I(6) to be coated with 400-540nm anti-reflection in two logical light faces, 800-900nm is anti-reflection and 1 μm of anti-reflection film.
7. broadband according to claim 1 tunable continuous wave 530-780nm optical parametric oscillator, is characterized in that, described speculum II(8) towards outgoing mirror I(7) minute surface be coated with 400-540nm high-reflecting film; Described light beam coupling system II(9) be at least one in geometry coupling system, spectrum coupled system; Described light beam coupling system II(9) be at least one in lens, spatial filter, optical isolator, half-wave plate, grating, multimode fiber.
8. broadband according to claim 1 tunable continuous wave 530-780nm optical parametric oscillator, it is characterized in that, described input mirror II(10) towards light beam coupling system II(9) minute surface be coated with 400-540nm anti-reflection film, described input mirror II(10) another side is coated with 400-540nm anti-reflection film and near-infrared high-reflecting film; Described speculum III(12) be coated with 400-540nm fractional transmission and near-infrared high-reflecting film towards the minute surface inside resonant cavity; Described speculum IV(13) be coated with 400-540nm fractional transmission and near-infrared high-reflecting film towards the minute surface inside resonant cavity; Described outgoing mirror II(15) be coated with near-infrared fractional transmission and 530-800nm anti-reflection film towards the minute surface inside resonant cavity, described outgoing mirror II(15) another side be coated with the anti-reflection and 530-800nm anti-reflection film of near-infrared.
9. broadband according to claim 1 tunable continuous wave 530-780nm optical parametric oscillator, is characterized in that, described optical parametric oscillator nonlinear crystal (11) is monolithic crystal, any one in polylith cascade; Described optical parametric oscillator nonlinear crystal (11) is periodic polarized stoichiometric lithium tantalate, periodic polarized lithium niobate, periodic polarized doped with magnesia lithium niobate, periodic polarized potassium titanium oxide phosphate, any one in periodic polarized arsenic acid titanyl rubidium; Two logical light faces of described optical parametric oscillator nonlinear crystal (11) are coated with the anti-reflection and near-infrared anti-reflection film of 400-540nm; Described optical parametric oscillator nonlinear crystal (11) adopts quasi-phase matched mode; Described optical parametric oscillator nonlinear crystal (11) is room temperature, any one in temperature controlling stove temperature control state.
10. broadband according to claim 1 tunable continuous wave 530-780nm optical parametric oscillator, it is characterized in that, described optical parametric oscillator-frequency doubling nonlinear crystal II(14) be any one in potassium niobate, barium metaborate, bismuth boracic acid, three lithium borates, potassium niobate, potassium titanium oxide phosphate, periodic polarized lithium niobate, periodic polarized potassium titanyl oxygenic phosphate(KTP) crystal; Described optical parametric oscillator-frequency doubling nonlinear crystal II(14) two logical light faces be coated with the anti-reflection and near-infrared anti-reflection film of 400-800nm.
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| CN105449520A (en) * | 2015-12-18 | 2016-03-30 | 南京雨花肿瘤防治研究所 | Wavelength-tunable red laser and wavelength tuning method |
| CN105514779A (en) * | 2016-01-18 | 2016-04-20 | 中国科学院苏州生物医学工程技术研究所 | High-power narrow-linewidth continuous wave visible light optical parametric oscillator |
| CN110556699A (en) * | 2019-09-16 | 2019-12-10 | 西安电子科技大学 | High-energy high-light beam quality tunable optical parametric oscillator pumped by nanosecond laser |
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