CN105159008A - Application of nonlinear optical device with lanthanum gallium niobate crystals as middle-infrared band - Google Patents
Application of nonlinear optical device with lanthanum gallium niobate crystals as middle-infrared band Download PDFInfo
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- CN105159008A CN105159008A CN201510697957.0A CN201510697957A CN105159008A CN 105159008 A CN105159008 A CN 105159008A CN 201510697957 A CN201510697957 A CN 201510697957A CN 105159008 A CN105159008 A CN 105159008A
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- 239000013078 crystal Substances 0.000 title claims abstract description 186
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 title claims abstract description 154
- 229910052733 gallium Inorganic materials 0.000 title claims abstract description 154
- 229910052746 lanthanum Inorganic materials 0.000 title claims abstract description 154
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 title claims abstract description 154
- 230000003287 optical effect Effects 0.000 title claims abstract description 134
- 230000005540 biological transmission Effects 0.000 claims abstract description 15
- 230000009022 nonlinear effect Effects 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 239000002253 acid Substances 0.000 claims description 148
- 239000011248 coating agent Substances 0.000 claims description 40
- 238000000576 coating method Methods 0.000 claims description 40
- 238000009738 saturating Methods 0.000 claims description 16
- 230000005284 excitation Effects 0.000 claims description 14
- 239000010453 quartz Substances 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- 230000010355 oscillation Effects 0.000 claims description 10
- 238000007747 plating Methods 0.000 claims description 10
- 239000012466 permeate Substances 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 230000008901 benefit Effects 0.000 abstract description 7
- 230000000638 stimulation Effects 0.000 abstract 1
- 239000000126 substance Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000003595 spectral effect Effects 0.000 description 4
- 239000002178 crystalline material Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
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- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910052724 xenon Inorganic materials 0.000 description 2
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 2
- 241000931526 Acer campestre Species 0.000 description 1
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 description 1
- 229910013641 LiNbO 3 Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 229910052805 deuterium Inorganic materials 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000003682 fluorination reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 239000000725 suspension Substances 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/355—Non-linear optics characterised by the materials used
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
- G02F1/3544—Particular phase matching techniques
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
- G02F1/392—Parametric amplification
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- Optics & Photonics (AREA)
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Abstract
The invention relates to an application of a nonlinear optical device with lanthanum gallium niobate crystals as a middle-infrared band. Adopted nonlinear optical crystals are the lanthanum gallium niobate crystals and are cut in the phase matching direction, the frequency of at least one incident laser beam is changed through the second-order nonlinear effect of the lanthanum gallium niobate crystals, at least one laser beam at another specific frequency is generated, and outputting of lasers in the middle-infrared band ranging from 1.6 micrometers to 7.04 micrometers is achieved through nonlinear optical frequency conversion. The invention further provides the middle-infrared-band nonlinear optical device based on the lanthanum gallium niobate crystals. The nonlinear optical device comprises an optical parameter amplifier, an optical parameter oscillator and a difference frequency laser apparatus. The lanthanum gallium niobate crystals have the advantages of wide transmission wave bands, stimulation of a near-infrared band, proper birefringence, the high second-order nonlinear optical coefficient, a high optical-damage-resisting threshold value and the like, and therefore the device can achieve high-energy and high-efficiency outputting of the lasers in the middle-infrared band and has the advantage that an output range can be continuously adjusted.
Description
Technical field
The present invention relates to a kind of niobic acid gallium lanthanum crystal as the application of middle-infrared band device for non-linear optical and the middle-infrared band device for non-linear optical based on niobic acid gallium lanthanum crystal, belong to nonlinear crystalline material and laser technology field.
Background technology
The research of mid-infrared laser wave band is one of study hotspot of laser field always; due to the window wave band that 3 ~ 5 μm of mid-infrared lasers are air; impact by gas molecules sorb and suspension scattering is little; therefore in spectral measurement, remote sensing, environmental protection and military affairs, there is very high using value; and 5 ~ 8 μm is field of Environment Protection for trace Fe and molecular spectrum application, communication field for the requisite wave band of signal launching and receiving, there is important need in fields such as modern communication, environmental protection, national security.The laser instrument that can produce middle-infrared band mainly contains the CO of frequency multiplication
2the solid state laser of gas laser, electrochemical fluorination deuterium laser instrument, semiconductor quantum cascade laser instrument, diode drive, the optical parametric oscillator, photoparametric amplifier, difference frequency device etc. of solid state laser excitation.Wherein mid-infrared parameter oscillator, photoparametric amplifier, difference frequency device can realize broad tuning, high-power, narrow linewidth exports and all solidstate, miniaturization, there is very important using value.Along with through wide ranges, absorption coefficient is little, damage threshold is high, nonlinear factor is moderate, the appearance of infrared non-linear crystal in good physical and chemical, is pushed to by the device for non-linear optical of middle-infrared band practical further.Existing middle infrared non-linear crystal mainly contains ZnGeP
2(ZGP), infrared output in the high power of 3-5 μm can be realized, but ZGP can not use ripe near infrared pumping, and ZGP crystal is expensive, adds the cost of device; Another main middle infrared non-linear crystal also has LiNbO
3(LN), its saturating spectral region are 0.33-5.5 μm, but due to LN damage threshold lower, by the restriction of pump power level, not easily realize the output of higher-energy.Given this, need a kind of novel middle infrared non-linear crystal badly, both had wide in spectral region, suitable optic damage threshold value, possess the advantages such as easy growing large-size, high optical quality monocrystalline, physical and chemical performance be stable, the high power mid-infrared laser can applying 3 ~ 8 μm of wide regions exports simultaneously.
Optically erasing (OpticalParametricAmplification, OPA) process, refers to that a branch of frequency is ω
pthe light laser of (also claiming exciting light) and a branch of frequency are ω
swhen the weak laser of (signal) injects nonlinear medium simultaneously, as flashlight (also claiming oscillation light) is exaggerated, produce frequency is v simultaneously
iidle frequencies of light (ideler frequency light, ω
i=ω
p-ω
s), be the OPA laser that will obtain, this phenomenon is called optically erasing.If this nonlinear medium to be placed in input mirror M
1with outgoing mirror M
2in the resonator cavity of composition, M
1to pumping frequency Transmission light, M
1, M
2to flashlight, ideler frequency light or both high reverse--bias, be then ω in frequency
plaser action under, from M
2optical parametric oscillation output frequency is ω by mirror
sand ω
ilaser; This just constitutes optical parametric oscillator (OpticalParametricOscillator, OPO).
Optical parametric oscillator (being called for short OPO) is the important technology producing mid and far infrared laser at present, which utilizes the mixed frequency characteristic of nonlinear crystal, can realize tunable wave length simultaneously.Have that tuning range is wide, efficiency is high, structure is simple and the feature such as reliable operation, wide bandwidth, tunable, high relevant radiating light source can be obtained.Along with invention and the application of novel high-quality nonlinear optical crystal, OPO has developed into the mainstream applications of tunable laser, shows more and more important prospect.
Difference frequency (DifferentFrequencyGeneration, DFG) process refers to exciting light ω higher for frequency
pthe flashlight ω lower with frequency
sincide in nonlinear crystal, due to the second order nonlinear effect of light and nonlinear crystal, produce frequencies omega
i=ω
p-ω
sdifference frequency light.Usually change under being also referred to as frequency.
Niobic acid gallium lanthanum crystal (La
3ga
5.5nb
0.5o
14, LGN) and be that single shaft is brilliant, belong to trigonal system 32 point group, P321 space group, its lattice constant is a=0.8232nm, c=0.5128nm.Because LGN has higher piezoelectric modulus, its application in piezoelectric property is well known, but LGN crystalline material, without inverting symmetric channel, has second nonlinear optic characteristic and moderate nonlinear optical coefficients (d
11=1.8pm/V), simultaneously LGN crystal through wide ranges (0.3-7.04 μm), have larger birefringence, higher optic damage threshold value (> 1GW/cm
2), chemical stability is good, not deliquescence, and therefore it has important prospect in the second nonlinear optic application such as such as optically erasing, optical parametric oscillation, difference frequency generation.Although LGN has above plurality of advantages, its application in second nonlinear optic is not paid attention to always, and the device for non-linear optical based on this nonlinear crystalline material is not also reported to some extent.
Summary of the invention
For the deficiencies in the prior art, the invention provides the application of niobic acid gallium lanthanum crystal as middle-infrared band device for non-linear optical.The present invention also provides a kind of middle-infrared band device for non-linear optical based on niobic acid gallium lanthanum crystal.
The present invention uses niobic acid gallium lanthanum crystal (LGN) as nonlinear optical crystal, obtains middle-infrared band device for non-linear optical.
The present invention also provides the optically erasing laser instrument, optical parameter oscillating laser or the difference frequency laser that use niobic acid gallium lanthanum crystal (LGN) to make as nonlinear optical crystal.
Terminological interpretation: " high reverse--bias ", " high transmission " in the present invention, " part reflection " have the common art-recognized meanings of this area.
" high reverse--bias " refers to and is greater than 99% to specific wavelength or the incident light reflectance of wave band.
" high transmission " refers to and is greater than 80% to the transmitance of specific wavelength or band of light.
" component permeate " refers to the transmitance of specific wavelength or wave band incident light at 1%-80%.
Technical scheme of the present invention is as follows:
Niobic acid gallium lanthanum crystal is as an application for middle-infrared band device for non-linear optical, and nonlinear optical crystal used in described device for non-linear optical is niobic acid gallium lanthanum crystal, and molecular formula is La
3ga
5.5nb
0.5o
14and crystal cuts along phase matching direction, leads to light mirror polish and plated film or not plated film, niobic acid gallium lanthanum crystal second order nonlinear effect is utilized to change the frequency of at least a branch of incident light, produce the laser of another characteristic frequency at least a branch of, realize 1.6-7.04 μm of middle-infrared band Laser output by nonlinear optical frequency conversion.
According to the application of niobic acid gallium lanthanum crystal of the present invention as middle-infrared band device for non-linear optical, described niobic acid gallium lanthanum crystal keep within the scope of 0.3-7.04 μm through.
According to the application of niobic acid gallium lanthanum crystal of the present invention as middle-infrared band device for non-linear optical, it is a type-Ⅱphase matching or two type-Ⅱphase matching that described niobic acid gallium lanthanum crystal realizes the mode that nonlinear optical frequency changes.
According to the application of niobic acid gallium lanthanum crystal of the present invention as middle-infrared band device for non-linear optical, described nonlinear optical frequency conversion comprises the nonlinear optical processs such as optically erasing, optical parametric oscillation or difference frequency.
According to niobic acid gallium lanthanum crystal of the present invention as the application of middle-infrared band device for non-linear optical, comprise with one of under type:
Mode one, niobic acid gallium lanthanum crystal as optically erasing device, the cutting angle 51.06-68.3 ° of described niobic acid gallium lanthanum crystal, crystal optical direction length is 25-200mm, surface finish, plated film or not plated film, described plated film is to the high saturating deielectric-coating of exciting light, flashlight and emergent light.The flashlight of the exciting light of the first driving source and the second driving source is had to incide on niobic acid gallium lanthanum crystal, after percolumbic acid gallium lanthanum crystal optically erasing, the mid-infrared laser that outgoing one is 2.2-6.84 μm.Preferably, the mid-infrared laser producing 3.55 μm exports.
Another preferred version is, when the first driving source is 1.064 μm of Q-switched lasers or mode-locked laser, second driving source is the tunable signal light laser of 1.28-1.38 μm, by changing crystal-cut angle from 56.56 to 62.1 ° while conditioning signal optical wavelength, the tunable mid-infrared laser that can realize 4.64-5.86 μm exports.
Mode two, niobic acid gallium lanthanum crystal is as optical parametric oscillation device, the cutting angle of niobic acid gallium lanthanum crystal is 51.06-68.3 °, crystal optical direction length is 25-200mm, surface finish, plated film or not plated film, if plated film, then plate the high saturating deielectric-coating of exciting light, flashlight and emergent light, this Laser Devices driving source is 1.064 μm of Q-switched lasers or mode-locked laser, and the mid-infrared laser producing 2.2-6.84 μm exports.
Mode three, niobic acid gallium lanthanum crystal is as difference frequency device, described niobic acid gallium lanthanum crystal-cut angle is 52.98-67.82 °, crystal optical direction length is 25-200mm, surface finish, plated film or not plated film, if plated film, then plate the high saturating deielectric-coating of exciting light, flashlight and emergent light, driving source is 0.8 μm of continuous wave laser, Q-switched laser or mode-locked laser, and the mid-infrared laser producing 1.6-7.04 μm exports.
The above niobic acid gallium lanthanum crystal-cut shape is rectangular parallelepiped or right cylinder.Crystal optical direction is length direction.
According to the present invention, niobic acid gallium lanthanum crystal middle-infrared band device for non-linear optical, comprises and forming according to the cutting of phase matching direction with niobic acid gallium lanthanum crystal.Preferably, described niobic acid gallium lanthanum crystal middle-infrared band device for non-linear optical is: optically erasing Laser Devices, optical parameter oscillating laser part or difference frequency laser part.Preferred version is as follows:
A. niobic acid gallium lanthanum crystal optically erasing Laser Devices, described niobic acid gallium lanthanum crystal cuts according to phase matching direction, cutting angle 51.06-68.3 °, crystal optical direction length is 25-200mm, and logical light mirror polish also plates exciting light, flashlight, the high saturating deielectric-coating of emergent light.
These niobic acid gallium lanthanum crystal optically erasing Laser Devices the first driving source used is 1.064 μm of Q-switched lasers or mode-locked laser, and the second driving source is flashlight laser instrument, and wavelength coverage is 1.26-2 μm.Described exciting light and flashlight incide on niobic acid gallium lanthanum crystal, and after described niobic acid gallium lanthanum crystal optically erasing Laser Devices amplify, the mid-infrared laser producing 2.2-6.84 μm exports.
Preferably, described niobic acid gallium lanthanum crystal-cut angle is 53.02 °; Crystal optical direction length is 50-100mm, and most preferably length is 72mm.Optimizing and hitting infrared laser is 3.55 μm.
B. a niobic acid gallium lanthanum crystal optical parameter oscillating laser part, the cutting angle of described niobic acid gallium lanthanum crystal is 51.06-68.3 °, and crystal optical direction length is 25-200mm, and logical light mirror polish also plates with the deielectric-coating saturating to exciting light, ideler frequency light and flashlight height.
This niobic acid gallium lanthanum crystal optical parameter oscillating laser part driving source used is 1.064 μm of Q-switched lasers or 1.064 μm of mode-locked lasers.The second order nonlinear effect that described flashlight and ideler frequency are only produced in crystal by exciting light produced.This optical parameter oscillating laser produces the mid-infrared laser output of 2.2-6.84 μm.
C. a during niobic acid gallium lanthanum crystal difference frequency laser part, described niobic acid gallium lanthanum crystal-cut angle is 52.98-67.82 °, and crystal optical direction length is 25-200mm, and logical light mirror polish also plates exciting light, flashlight and difference frequency to be exported to the high saturating deielectric-coating of light.
This niobic acid gallium lanthanum crystal difference frequency laser part driving source used is 0.8 μm of continuous wave laser, Q-switched laser or mode-locked laser.This difference frequency laser produces the mid-infrared laser output of 1.6-7.04 μm.
Preferred according to the present invention, the optical direction length of the above niobic acid gallium lanthanum crystal is 50-100mm; More preferably length is 70-80mm.
Here is in application of the present invention, utilizes niobic acid gallium lanthanum crystal as the preferred version of the photoparametric amplifier of middle-infrared band device for non-linear optical, optical parametric oscillator, difference frequency laser:
A, a kind of photoparametric amplifier, comprise aforementioned A. niobic acid gallium lanthanum crystal optically erasing Laser Devices; Wherein said niobic acid gallium lanthanum crystal leads to light face optical polish, and is coated with the deielectric-coating high to the first driving source exciting light 1.064 μm, the second excitation source signal light 1.52 μm and emergent light 3.55 μm; Described niobic acid gallium lanthanum crystal-cut angle is 53.02 °, and crystal length is 72mm; This optically erasing device comprise along light path arrange the first driving source exciting light laser instrument, the second excitation source signal light laser, spectroscope, described niobic acid gallium lanthanum crystal optically erasing Laser Devices, optical filter; After described niobic acid gallium lanthanum crystal optically erasing Laser Devices carry out optically erasing, filter exciting light by optical filter and obtain 3.55 μm of mid-infrared lasers outputs.
B, a kind of optical parametric oscillator, comprise aforementioned B. niobic acid gallium lanthanum crystal optical parameter oscillating laser part; Wherein said niobic acid gallium lanthanum crystal leads to light face optical polish, is coated with the deielectric-coating high to driving source 1.064 μm of laser, flashlight 1.28-1.38 μm and ideler frequency light 4.64-5.86 μm; Niobic acid gallium lanthanum crystal-cut angle is 58.72 °; Outgoing mid-infrared laser scope is 4.64-5.86 μm, and it is 78mm that niobic acid gallium lanthanum crystal leads to light length; This optical parametric oscillator includes driving source, and launching a branch of wavelength is 1.064 μm of laser beam, successively by optoisolator, half-wave plate, then through two ir reflectors and lens focus in laser cavity, produces mid-infrared laser and exports; Wherein laser cavity is by inputting mirror and outgoing mirror forms, described input mirror is level crossing, two logical light face platings are with to 1.064 μm of laser high transmissions, to the deielectric-coating of 1.28-1.38 μm and 4.64-5.86 μm high reverse--bias, outgoing mirror is level crossing, plating is with to 1.064 μm and 1.28-1.38 μm of high reverse--bias, and to 4.64-5.86 μm of component permeate, transmitance is the deielectric-coating of 15%; Described niobic acid gallium lanthanum crystal optical parameter oscillating laser part is placed between input mirror and outgoing mirror; By changing the angle of niobic acid gallium lanthanum crystal from 56.56 to 62.1 °, the mid-infrared laser that can realize 4.64-5.86 μm exports.
C, a kind of difference frequency laser, comprise aforementioned C. niobic acid gallium lanthanum crystal difference frequency laser part; Described niobic acid gallium lanthanum crystal leads to light face optical polish, plates with the deielectric-coating to 1.4 μm and 1.87 μm high transmissions; The cutting angle of this niobic acid gallium lanthanum crystal is 56.38 °, and niobic acid gallium lanthanum crystal optical direction length is 75mm; This difference frequency laser comprises the first driving source, optoisolator, half-wave plate, ir reflector, lens, niobic acid gallium lanthanum crystal difference frequency laser part, the second driving source, optoisolator, half-wave plate, ir reflector; Described first driving source is Femtosecond Ti∶sapphire laser, and producing wavelength is the pulse laser of 800nm, successively through optoisolator, half-wave plate, ir reflector, lens, niobic acid gallium lanthanum quartz crystal device; The incentive optical wavelength of the second driving source is 1.4 μm; The exciting light of this second driving source is successively through optoisolator, half-wave plate, ir reflector, lens, niobic acid gallium lanthanum quartz crystal device, and produce mid-infrared laser with the laser difference frequency of the first driving source and export, laser output wavelength is 1.87 μm.
Niobic acid gallium lanthanum crystal of the present invention produces nonlinear response under the excitation of incident light, is realized effective generation of middle-infrared band nonlinear optical by phase matching.Niobic acid gallium lanthanum crystal easily grows into large scale, high optical quality crystal, and easily polishing, physics, stable chemical performance, and have wider through advantages such as wave band (0.3-7.04 μm), the excitation that can realize near-infrared band, suitable birefringence, higher nonlinear second-order optical susceptibility (1.8pm/V), high optic damage threshold values, make niobic acid gallium lanthanum quartz crystal device can realize high-energy, high-level efficiency middle-infrared band Laser output and have the continuously adjustable advantage of output area, there is important practical value.
The device for non-linear optical that the present invention uses niobic acid gallium lanthanum crystal to make can realize mid-infrared light frequency translation, and compared with existing device for non-linear optical, niobic acid gallium lanthanum crystal has higher optic damage threshold value (> 1GW/cm
2), wider transparency range (0.3-7.04 μm), larger birefringence, the advantages such as high chemical stability, can better meet practical application request.
Accompanying drawing explanation
Fig. 1 is photoparametric amplifier structure of the present invention and light path schematic diagram.Wherein, 1 is the first driving source exciting light laser instrument; 2 is second excitation source signal light lasers; 3 is spectroscopes; 4 is niobic acid gallium lanthanum quartz crystal devices, along the cutting of crystalline phase matching direction, is coated with the high saturating deielectric-coating of the first driving source exciting light, the second excitation source signal light and emergent light; 5 is optical filters, and in figure, the direction of arrow represents the direction of light.
Fig. 2 is optical parameter oscillating laser structure of the present invention and light path schematic diagram.Wherein, 6 is the first driving source; 7 is optoisolator; 8 is half-wave plate; 9,10 is ir reflector; 11 is lens; 12 is incident mirror, and two logical light face platings are with the deielectric-coating to exciting light high transmission and to flashlight and ideler frequency light high reverse--bias; 13 is niobic acid gallium lanthanum quartz crystal device, along the cutting of phase matching direction, plates with the deielectric-coating to the first driving source exciting light and the ideler frequency light produced and flashlight high transmission; 14 is outgoing mirror, plates with the deielectric-coating to flashlight high reverse--bias and to ideler frequency light component permeate.In figure, the direction of arrow represents the direction of light.
Fig. 3 is difference frequency laser structure of the present invention and light path schematic diagram.Wherein, 15 is the first driving source; 16,23 is optoisolator; 17,22 is half-wave plate; 18,21 is ir reflector; 19 is lens, and 20 is niobic acid gallium lanthanum quartz crystal device, along the cutting of crystalline phase matching direction, plates with to the high saturating deielectric-coating of two incident lights and emergent light; 24 is the second driving source.In figure, the direction of arrow represents the direction of light.
Fig. 4 is the transmitance collection of illustrative plates of the present invention's niobic acid gallium lanthanum crystal used.Horizontal ordinate is wavelength (μm), and ordinate is through (%).
Fig. 5 is the first kind phase matching tuning curve of niobic acid gallium lanthanum quartz crystal device optically erasing of the present invention and optical parametric oscillation.Horizontal ordinate is θ (°), and ordinate is wavelength (μm).
Fig. 6 is the first kind phase matching tuning curve that niobic acid gallium lanthanum quartz crystal device difference frequency of the present invention produces.Horizontal ordinate is θ (°), and ordinate is wavelength (μm).
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described, but be not limited thereto.
Nonlinear optical crystal provided by the invention is niobic acid gallium lanthanum crystal, and its chemical formula is La
3ga
5.5nb
0.5o
14.Its point group is 32, (incident two-beam polarization direction is inconsistent, and a branch of is o light to there are a class (incident two-beam polarization mode is consistent, is e light) and two type-Ⅱphase matching, a branch of is e light), corresponding effective second order nonlinear coefficient is d
eff=d
11cos
2θ (a saphe coupling) and d
eff=d
11cos θ (two saphe couplings), θ is phase matching angle.
The present invention calculates the phase matching angle of niobic acid gallium lanthanum crystal by Sellmier equation as follows:
List of references is Electro-optic, PiezoelectricandDielectricPropertiesofLangasite, LanganiteandLangetaite, J.Stade, L.Bohaty, M.Hengst, R.B.Heimann, Crysta.Res.Technol., vol.37,10,1113-1120,2002.
The below embodiment of the tunable middle infrared laser of introduction niobic acid gallium lanthanum crystal manufacture.
Embodiment 1:
A kind of niobic acid gallium lanthanum crystal optically erasing Laser Devices, described niobic acid gallium lanthanum crystal leads to light face optical polish, plated film or not plated film, if plated film, then plates the high saturating deielectric-coating of exciting light, flashlight and emergent light; Described niobic acid gallium lanthanum crystal-cut angle, namely the angle of crystal optical direction and optical axis is 51.06-68.3 °, and preferably, crystal-cut angle is 53.02 °; Mid-infrared laser scope is 2.2-6.84 μm, and preferably, outgoing mid-infrared laser is 3.55 μm.Crystal length can be 25-200mm, and preferably, crystal length is 72mm.
Described niobic acid gallium lanthanum crystal optically erasing Laser Devices, principle of work as shown in Figure 1.The first driving source 1 (exciting light), the second driving source 2 (flashlight), spectroscope 3, niobic acid gallium lanthanum crystal 4 is included, optical filter 5 in light path.Wherein, the first driving source 1 launches beam of laser bundle (exciting light), and wavelength is 1.064 μm, successively by spectroscope 3, and niobic acid gallium lanthanum quartz crystal device 4, optical filter 5; Second driving source 2 launches beam of laser bundle (flashlight), successively by spectroscope 3, and niobic acid gallium lanthanum crystal 4.First driving source laser instrument 1 is Mode-locked laser device or Q-switched pulse laser, adjusts Q can be initiatively acousto-optic Q modulation, initiatively electric-optically Q-switched and passive Q-adjusted.The energisation mode of this laser instrument can be xenon lamp excitation, semiconductor-laser-pumped or solid-state laser excitation.Second driving source 2 is flashlight laser instrument, and its wavelength coverage is 1.26-2 μm.Preferably, signal light wavelength can be 1.52 μm.1.064 μm of exciting lights that first driving source produces and 1.52 μm of flashlights that the second driving source produces incide on niobic acid gallium lanthanum crystal 4, after optically erasing, produce mid-infrared laser, its wavelength coverage is 2.2-6.84 μm, preferably, outgoing mid-infrared laser wavelength is 3.55 μm, and mating plate 5 filters out exciting light after filtration afterwards, obtains 3.55 μm of mid-infrared lasers and exports.
In the present embodiment, when incentive optical wavelength is 1.064 μm, carry out the relation of the wavelength of the mid-infrared laser that optically erasing produces and signal light wavelength and phase matching angle θ as shown in Figure 5 through niobic acid gallium lanthanum crystal optically erasing Laser Devices.
Embodiment 2:
As described in Example 1, difference to be the second driving source 2 the be tunable signal light laser of 1.28-1.38 μm, by changing crystal-cut angle from 56.56-62.1 ° while conditioning signal optical wavelength, the tunable mid-infrared laser that can realize 4.64-5.86 μm exports.
Embodiment 3:
A kind of niobic acid gallium lanthanum crystal optical parameter oscillating laser, described niobic acid gallium lanthanum crystal leads to light face optical polish, plated film or not plated film, if plated film, then be coated with the deielectric-coating high to driving source 1.064 μm of laser, flashlight 1.26-2 μm and ideler frequency light 2.2-6.84 μm, preferably, plate with the deielectric-coating to 1.34 μm and 5.16 μm high; The angle of niobic acid gallium lanthanum crystal-cut angle and crystal optical direction and optical axis is generally 51.06-68.3 °, and preferably, crystal-cut angle is 58.72 °; Outgoing mid-infrared laser scope is 2.2-6.84 μm, and preferably, outgoing mid-infrared laser is 5.16 μm.Crystal length is 50-100mm, and preferred crystal length is 78mm.
Optical parametric oscillator described in the present embodiment adopts Liang Jing standing-wave cavity mechanism, and this structure is relatively simple, is suitable for stable high-power output.Fig. 2 is the fundamental diagram of embodiment 3.Wherein, 6 is the first driving source, and launching a branch of wavelength is 1.064 μm of laser beam, successively by optoisolator 7, avoids light echo to produce damage to laser instrument; Half-wave plate 8, the polarization direction of adjustment exciting light; Focus in laser cavity through two ir reflectors 9,10 and lens 11 again, produce mid-infrared laser and export.Wherein laser cavity is by inputting mirror 12 and outgoing mirror 14 forms, the plating of 12 two, described input mirror logical light face is with the deielectric-coating to exciting light high transmission and to flashlight and ideler frequency light high reverse--bias, and outgoing mirror 14 plates with the deielectric-coating to flashlight high reverse--bias and to ideler frequency light component permeate.Niobic acid gallium lanthanum quartz crystal device 13 is placed between input mirror 12 and outgoing mirror 14.
Only there is a branch of driving source laser to squeeze into crystal in optical parametric oscillator, utilize the second order nonlinear effect of crystal to produce ideler frequency light and flashlight.
Described driving source 6 is Mode-locked laser device or Q-switched pulse laser, adjusts Q can be initiatively acousto-optic Q modulation, initiatively electric-optically Q-switched and passive Q-adjusted.The energisation mode of this laser instrument can be xenon lamp excitation, semiconductor-laser-pumped or solid-state laser excitation.
Described input mirror 12 is level crossing or concave mirror, outgoing mirror 14 level crossing or concave mirror.Wherein, the curvature of concave mirror is 20mm-1000mm, and its concave surface is in the face of niobic acid gallium lanthanum quartz crystal device.Distance between input mirror 12 and outgoing mirror 14 can calculate by prior art, makes it be conducive to flashlight vibration.The present invention is preferred, and the spacing of input mirror and outgoing mirror is between 15-200mm.The plating of input mirror 12 two sides with to driving source laser instrument 1.064 μm of laser high transmissions, to the deielectric-coating of flashlight 1.26-2 μm and ideler frequency light 2.2-6.84 μm of high reverse--bias, preferably, is plated with the deielectric-coating to 1.34 μm and 5.16 μm high reverse--bias.The plating of outgoing mirror 14 two sides is with to driving source laser instrument 1.064 μm of laser and flashlight 1.26-2 μm high reverse--bias, to the deielectric-coating of 2.2-6.84 μm of component permeate (1%-80%), preferably, plating with to 1.34 μm of high reverse--bias, is the deielectric-coating of 10%-30% to 5.16 μm of transmitances.
Fig. 5 is incentive optical wavelength when being 1.064 μm, the ideler frequency optical wavelength that optical parametric oscillation produces and the relation of signal light wavelength and phase matching angle θ.(encourage because optically erasing and optical parametric oscillation are three wave mixing and all fix 1.064 mum wavelength laser, and the parameters such as the dispersion equation of both uses in phase matching calculates are the same, the collection of illustrative plates therefore calculating gained is also the same.)
Embodiment 4:
As described in Example 3, difference is that input mirror 12 plates with to 1.064 μm of laser high transmissions, to the deielectric-coating of 1.28-1.38 μm and 4.64-5.86 μm high reverse--bias; Outgoing mirror 14 plates with to 1.064 μm and 1.28-1.38 μm of high reverse--bias, and to 4.64-5.86 μm of component permeate, preferred transmitance is the deielectric-coating of 15%.By changing the angle of niobic acid gallium lanthanum crystal from 56.56 to 62.1 °, the tunable mid-infrared laser that can realize 4.64-5.86 μm exports.
Embodiment 5:
A kind of niobic acid gallium lanthanum crystal difference frequency laser part, described niobic acid gallium lanthanum crystal leads to light face optical polish, plated film or not plated film, if plated film, then be coated with the deielectric-coating to the first driving source laser 0.8 μm, flashlight 0.91-1.6 μm, output wavelength 1.6-7.04 μm high transmission, preferably, described niobic acid gallium lanthanum crystal leads to the plating of light face with the deielectric-coating to 1.4 μm and 1.87 μm high transmissions.The cutting angle of this crystal can be 52.98-67.82 °, and preferably, the brilliant cutting angle of described niobic acid gallium lanthanum is 56.38 °, and crystal length is 50-100mm; Preferred length 75mm.
The principle of work of embodiment 5 as shown in Figure 3.The difference frequency laser that the present embodiment adopts comprises the first driving source 15, optoisolator 16, half-wave plate 17, ir reflector 18, lens 19, niobic acid gallium lanthanum quartz crystal device 20, second driving source 24, optoisolator 23, half-wave plate 22, ir reflector 18,21.
Described first driving source 15 is Femtosecond Ti∶sapphire laser, and this laser optical spectral limit is 500 to 1000nm, and the present embodiment uses the pulse laser that wavelength is 800nm, successively through optoisolator 16, half-wave plate 17, ir reflector 18, lens 19, niobic acid gallium lanthanum crystal 20.The exciting light of the second driving source 24 is the laser of 0.91-1.6 μm, and preferably, this second driving source optical maser wavelength is 1.4 μm; This second driving source laser is successively through optoisolator 23, half-wave plate 22, ir reflector 21,18, lens 19, niobic acid gallium lanthanum crystal 20, produces mid-infrared laser with the laser difference frequency of the first driving source 15 and exports, and laser output wavelength can be 1.6-7.04 μm, preferably, producing mid-infrared laser output wavelength is 1.87 μm.
Fig. 6 is excitation wavelength when being 0.8 μm, the relation of the mid-infrared laser wavelength that difference frequency produces and signal light wavelength and phase matching angle θ.
Embodiment 6:
As described in Example 5, difference to be the first driving source 24 the be tunable signal light laser of 0.9-1.3 μm, by changing the angle of niobic acid gallium lanthanum crystal from 52.98 to 59.16 °, the tunable mid-infrared laser that can realize 2.08-7.04 μm exports.
Certainly; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and modification according to the present invention, but these corresponding changes and modification all should belong to the protection domain of the claim appended by the present invention.
Claims (10)
1. niobic acid gallium lanthanum crystal is as an application for middle-infrared band device for non-linear optical, and nonlinear optical crystal used in described device for non-linear optical is niobic acid gallium lanthanum crystal, and molecular formula is La
3ga
5.5nb
0.5o
14and crystal cuts along phase matching direction, leads to light mirror polish and plated film or not plated film, niobic acid gallium lanthanum crystal second order nonlinear effect is utilized to change the frequency of at least a branch of incident light, produce the laser of another characteristic frequency at least a branch of, realize 1.6-7.04 μm of middle-infrared band Laser output by nonlinear optical frequency conversion.
2. niobic acid gallium lanthanum crystal as claimed in claim 1 is as the application of middle-infrared band device for non-linear optical, wherein said niobic acid gallium lanthanum crystal keep within the scope of 0.3-7.04 μm through.
3. niobic acid gallium lanthanum crystal as claimed in claim 1 is as the application of middle-infrared band device for non-linear optical, and it is a type-Ⅱphase matching or two type-Ⅱphase matching that wherein said niobic acid gallium lanthanum crystal realizes the mode that nonlinear optical frequency changes.
4. niobic acid gallium lanthanum crystal as claimed in claim 1 is as the application of middle-infrared band device for non-linear optical, and wherein said nonlinear optical frequency conversion comprises the nonlinear optical processs such as optically erasing, optical parametric oscillation or difference frequency.
5. niobic acid gallium lanthanum crystal as claimed in claim 1 is as the application of middle-infrared band device for non-linear optical, comprises with one of under type:
Mode one, niobic acid gallium lanthanum crystal is applied as optically erasing device, the cutting angle 51.06-68.3 ° of described niobic acid gallium lanthanum crystal, crystal optical direction length is 25-200mm, surface finish, plated film or not plated film, if plated film, then plate the high saturating deielectric-coating of exciting light, flashlight and emergent light, have the flashlight of the exciting light of the first driving source and the second driving source to incide on niobic acid gallium lanthanum crystal, after percolumbic acid gallium lanthanum crystal optically erasing, outgoing 2.2-6.84 μm mid-infrared laser;
Mode two, niobic acid gallium lanthanum crystal is applied as optical parametric oscillation device, the cutting angle of niobic acid gallium lanthanum crystal is 51.06-68.3 °, crystal optical direction length is 25-200mm, surface finish, plated film or not plated film, if plated film, then plate the high saturating deielectric-coating of exciting light, flashlight and emergent light, the driving source of described generation exciting light is 1.064 μm of Q-switched lasers or mode-locked laser; The mid-infrared laser of outgoing 2.2-6.84 μm;
Mode three, niobic acid gallium lanthanum crystal is as difference frequency device application, described niobic acid gallium lanthanum crystal-cut angle is 52.98-67.82 °, crystal optical direction length is 25-200mm, surface finish, plated film or not plated film, if plated film, then plate the high saturating deielectric-coating of exciting light, flashlight and emergent light, driving source is 0.8 μm of continuous wave laser, Q-switched laser or mode-locked laser, the mid-infrared laser of outgoing 1.6-7.04 μm.
6. a niobic acid gallium lanthanum crystal middle-infrared band device for non-linear optical, niobic acid gallium lanthanum crystal used forms according to the cutting of phase matching direction, comprises optically erasing Laser Devices, optical parameter oscillating laser part or difference frequency laser part.
7. niobic acid gallium lanthanum crystal middle-infrared band device for non-linear optical as claimed in claim 6, is characterized in that, is selected from one of following:
A. niobic acid gallium lanthanum crystal optically erasing Laser Devices, described niobic acid gallium lanthanum crystal cuts according to phase matching direction, cutting angle 51.06-68.3 °, niobic acid gallium lanthanum crystal optical direction length is 25-200mm, surface finish, plated film or not plated film, if plated film, then plate the high saturating deielectric-coating of exciting light, flashlight and emergent light;
These niobic acid gallium lanthanum crystal optically erasing Laser Devices the first driving source used is 1.064 μm of Q-switched lasers or mode-locked laser, and the second driving source is flashlight laser instrument, and wavelength coverage is 1.26-2 μm; Described exciting light and flashlight incide on niobic acid gallium lanthanum crystal, and after described niobic acid gallium lanthanum crystal optically erasing Laser Devices amplify, the mid-infrared laser producing 2.2-6.84 μm exports;
B. a niobic acid gallium lanthanum crystal optical parameter oscillating laser part, the cutting angle of described niobic acid gallium lanthanum crystal is 51.06-68.3 °, and crystal optical direction length is 25-200mm, surface finish, plated film or not plated film, if plated film, then plate the high saturating deielectric-coating of exciting light, flashlight and emergent light;
This niobic acid gallium lanthanum crystal optical parameter oscillating laser part driving source used is 1.064 μm of Q-switched lasers or 1.064 μm of mode-locked lasers; This optical parameter oscillating laser produces the mid-infrared laser output of 2.2-6.84 μm;
C. a niobic acid gallium lanthanum crystal difference frequency laser part, described niobic acid gallium lanthanum crystal-cut angle is 52.98-67.82 °, and crystal optical direction length is 25-200mm, surface finish, plated film or not plated film, if plated film, then plate the high saturating deielectric-coating of exciting light, flashlight and emergent light;
This niobic acid gallium lanthanum crystal difference frequency laser part driving source used is 0.8 μm of continuous wave laser, Q-switched laser or mode-locked laser; This difference frequency laser produces the mid-infrared laser output of 1.6-7.04 μm.
8. a photoparametric amplifier, comprises A. niobic acid gallium lanthanum crystal optically erasing Laser Devices according to claim 6; Wherein said niobic acid gallium lanthanum crystal leads to light face optical polish, and is coated with the deielectric-coating high to the first driving source exciting light 1.064 μm, the second excitation source signal light 1.52 μm and emergent light 3.55 μm; Described niobic acid gallium lanthanum crystal-cut angle is 53.02 °, and crystal length is 72mm;
This optically erasing device comprise along light path arrange the first driving source, the second excitation source signal light laser, spectroscope, described niobic acid gallium lanthanum crystal optically erasing Laser Devices, optical filter;
After described niobic acid gallium lanthanum crystal optically erasing Laser Devices carry out optically erasing, filter exciting light by optical filter and obtain 3.55 μm of mid-infrared lasers outputs.
9. an optical parametric oscillator, comprises B niobic acid gallium lanthanum crystal optical parameter oscillating laser part according to claim 6; Wherein said niobic acid gallium lanthanum crystal leads to light face optical polish, is coated with the deielectric-coating high to driving source 1.064 μm of laser, flashlight 1.28-1.38 μm and ideler frequency light 4.64-5.86 μm; Niobic acid gallium lanthanum crystal-cut angle is 58.72 °; Outgoing mid-infrared laser scope is 4.64-5.86 μm, and it is 78mm that niobic acid gallium lanthanum crystal leads to light length;
This optical parametric oscillator includes driving source, and launching a branch of wavelength is 1.064 μm of laser beam, successively by optoisolator, half-wave plate, again through two ir reflectors and lens focus in laser cavity, produce mid-infrared laser and export; Wherein laser cavity is by inputting mirror and outgoing mirror forms, described input mirror is level crossing, two logical light face platings are with to 1.064 μm of laser high transmissions, to the deielectric-coating of 1.28-1.38 μm and 4.64-5.86 μm high reverse--bias, outgoing mirror is level crossing, plating is with to 1.064 μm and 1.28-1.38 μm of high reverse--bias, and to 4.64-5.86 μm of component permeate, transmitance is the deielectric-coating of 15%; Described niobic acid gallium lanthanum crystal optical parameter oscillating laser part is placed between input mirror and outgoing mirror; By changing the angle of niobic acid gallium lanthanum crystal from 56.56 to 62.1 °, the mid-infrared laser that can realize 4.64-5.86 μm exports.
10. a difference frequency laser, comprises C niobic acid gallium lanthanum crystal difference frequency laser part according to claim 6;
Described niobic acid gallium lanthanum crystal leads to light face optical polish, plates with the deielectric-coating to 1.4 μm and 1.87 μm high transmissions; The cutting angle of this niobic acid gallium lanthanum crystal is 56.38 °, and niobic acid gallium lanthanum crystal optical direction length is 75mm;
This difference frequency laser comprises the first driving source, optoisolator, half-wave plate, ir reflector, lens, niobic acid gallium lanthanum crystal difference frequency laser part, the second driving source, optoisolator, half-wave plate, ir reflector; Described first driving source is Femtosecond Ti∶sapphire laser, and producing wavelength is the pulse laser of 800nm, successively through optoisolator, and half-wave plate, ir reflector, lens, niobic acid gallium lanthanum quartz crystal device; The incentive optical wavelength of the second driving source is 1.4 μm; The exciting light of this second driving source is successively through optoisolator, and half-wave plate, ir reflector, lens, niobic acid gallium lanthanum quartz crystal device, produces mid-infrared laser with the laser difference frequency of the first driving source and export, and laser output wavelength is 1.87 μm.
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| CN113346348A (en) * | 2021-05-22 | 2021-09-03 | 中国科学院理化技术研究所先进激光研究院(济南) | Laser scalpel with ultralow collateral damage |
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