CN105549295A - Ultraviolet laser frequency converter with noncritical phase matching frequency doubling and three-frequency doubling performance and work method of ultraviolet laser frequency converter - Google Patents
Ultraviolet laser frequency converter with noncritical phase matching frequency doubling and three-frequency doubling performance and work method of ultraviolet laser frequency converter Download PDFInfo
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- 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
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- 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
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Abstract
The invention relates to an ultraviolet laser frequency converter with noncritical phase matching frequency doubling and three-frequency doubling performance and a work method of the ultraviolet laser frequency converter. The ultraviolet laser frequency converter comprises a fundamental frequency light source, a beam shrinking system, a first reflection mirror, a nonlinear optical crystal, a quarter-wave plate, a second reflection mirror and a filter. The included angle between the angular bisector of the X axis and the Z axis of the nonlinear optical crystal and fundamental frequency light in the polarization direction is 0-5 degrees, the included angle between the direction of the optical axis of the quarter-wave plate and the direction of polarization of the fundamental frequency light is 0-5 degrees, the included angle between the first reflection mirror and the center shaft of a light path is 35-55 degrees, and the nonlinear optical crystal is a GdxY1-xCOB crystal; when the wave length of the fundamental frequency light is 1064 nm, the value range of x is 0.18-0.22, and when the wave length of the fundamental frequency light is 1053 nm, the value range of x is 0.11-0.15. By means of the ultraviolet laser frequency converter, one piece of GdxY1-xCOB can serve as a frequency doubling crystal and a three-frequency doubling crystal simultaneously, and manufacturing cost is low.
Description
Technical field
The present invention relates to and a kind ofly have noncritical phase matching frequency multiplication, the Ultra-Violet Laser frequency conversion device of frequency tripling performance and method of work thereof concurrently, belong to laser and nonlinear optical technology field.
Background technology
In modern technologies, laser instrument plays more and more important role.Wherein, all-solid-state ultraviolet laser has very important application in the field such as Laser Micro-Machining (boring, cutting and corrosion), laser chemistry, optics engraving, rapid shaping, laser printing and spectroscopy.Because the wavelength of practical solid state laser is mostly positioned at infrared spectral region, in order to obtain ultraviolet light, need to carry out frequency transformation with nonlinear optical crystal to infrared laser, this method has that efficiency is high, good beam quality, volume are little, stability is high and the advantage such as the life-span is long.At present, the most frequently used technology path carries out frequency tripling to neodymium-doped yttrium-aluminum garnet or nd glass laser (1064nm/1053nm), thus the ultraviolet obtaining 355nm/351nm exports, this process comprises two steps: the frequency multiplication of first carrying out infrared fundamental frequency light with one block of nonlinear optical crystal, the frequency doubling green light (532nm/526nm) produced and residue fundamental frequency light again in another block nonlinear optical crystal and frequently, finally realize 355nm/351nm ultraviolet light and export.As shown in Fig. 1 (a), two pieces of crystal are used separately as frequency multiplication and frequency tripling crystal.At present, conventional frequency-doubling crystal is KH
2pO4 (KDP), KTiOPO
4and LiB (KTP)
3o
5(LBO), frequency tripling crystal is KDP, LBO and β-BaB
2o
4(BBO).Even if frequency multiplication and frequency tripling use same crystal, because phase matching direction is different, so space corner cut is different, therefore, inevitably uses two pieces of crystal, thus raw material and processing cost are greatly improved.
Directly exporting frequency tripling light for realizing one block of nonlinear crystal, two key issues must be solved.(1) suitable Gd is found
xy
1-xcOB crystal, namely determines component parameter x.(2) requirement of phase matching mode to polarization state is met.Principle, even if find, suitable crystal composition makes frequency multiplication, Gd is all adjusted in frequency tripling phase matching direction
xy
1-xin the Y-axis of COB crystal, if do not adjusted the polarization state of frequency doubled light, also cannot export frequency tripling light.Reason be the noncritical phase matching of II class produce the X-axis (quick shaft direction) of polarization direction along crystal of frequency doubled light, and I class noncritical phase matching frequency tripling requires that frequency doubled light polarization direction is along the Z axis (slow-axis direction) of crystal.
Gd
xy
1-xca
4o (BO
3)
3(Gd
xy
1-xcOB) serial borate crystal is that a kind of refractive index can continually varying substitutional solid solution, and then can realize the continuously adjustabe of noncritical phase matching wavelength.This crystalloid has that effective nonlinear optical coefficient is moderate, transmission region is wide, threshold for resisting laser damage is high, phase matching ranges greatly, not deliquescence and the advantage such as physico-chemical property is stable, be the nonlinear optical crystal of a class function admirable, there is broad prospect of application.Research shows: along Gd
xy
1-xcOB serial crystal Y-axis, namely (90 °, 90 °) phase matching direction, noncritical phase matching II class frequency multiplication that wavelength is 1064nm/1053nm and I class frequency tripling can be realized by composition regulation, and with realize the crystal composition of noncritical phase matching frequency multiplication and frequency tripling closely.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of Ultra-Violet Laser frequency conversion device having noncritical phase matching frequency multiplication, frequency tripling performance concurrently.
Present invention also offers the method for work of above-mentioned Ultra-Violet Laser frequency conversion device.
The present invention first realizes non-critical frequency multiplication with one piece of crystal and realizes non-critical frequency tripling again, and obtain 355nm/351nm ultraviolet light and export, cost is low, volume is little, processing is convenient, is convenient to large-scale promotion.
Terminological interpretation
1, phase matching: in nonlinear optical frequency conversion process, incident light wave produces harmonics polarized wave in the place of its process, and these harmonics polarized waves are propagated and mutually interfered in crystal, and its result is exactly the harmonic wave total intensity measured.The harmonic phase difference that this intensity and each position produce is relevant, if phase differential is zero, namely phase place is consistent, then harmonic wave is effectively strengthened; If phase differential is inconsistent, then harmonic wave will be cancelled out each other; Do not observe harmonic wave even completely.Obviously, only have when incident light velocity of wave propagation is equal with humorous velocity of wave propagation, the harmonic wave that in crystal, each position produces is just because phase place is strengthened unanimously and mutually, and this situation is called phase matching.Principle is said in nonlinear optical crystal, the phase matching of three wave interactions has two types: frequency is ω
1light wave and frequency be ω
2light wave there is identical linear polarization, then phase matching is I class; Otherwise, light wave ω
1with light wave ω
2have orthogonal linear polarization, then phase matching is II class.
2, noncritical phase matching (NCPM): refer to the phase matching along principal-axes coordinate direction to biaxal crystal, the phase matching in other situations is called critical phase matching (CPM).Compared with CPM, NCPM has tolerance angle large, and deviation angle is zero and the high advantage of crystal utilization factor, therefore mates also referred to as optimum angle.
3, frequency multiplication (SHG): optical frequency-doubling, also known as optical second harmonic, refers to because light and nonlinear medium (being generally crystal) interact, makes frequency be the phenomenon that the fundamental frequency light of ω changes the frequency doubled light of 2 ω into.
4, frequency tripling (THG): frequency tripling, also known as optics third harmonic, refers to frequency to be the fundamental frequency light of ω and frequency be that the frequency doubled light of 2 ω interacts in crystal, become the phenomenon that frequency is the light of 3 ω.
5, wave plate: the optical device producing additional light path (or phase differential) between mutually perpendicular two light vibration can be made.Usually by having the quartz of precise thickness, the birefringence wafer such as kalzit or mica makes, its optical axis is parallel with wafer surface.
6, quarter-wave plate: certain thickness birefringence monocrystalline thin slice.When the light transmission of normal incidence, the phasic difference between ordinary light (o light) and non-ordinary light (e light) equals pi/2 or its odd-multiple, and such wafer is called quarter-wave plate or quarter wave plate.When the incident vibration plane of polarized light and the angle theta of wave plate optical axis are 45 °, become circularly polarized light by the linearly polarized light of quarter-wave plate, otherwise, when circularly polarized light is after quarter-wave plate, then become linearly polarized light.When light passes twice through quarter-wave plate, effect is equivalent to 1/2nd wave plates.
7, half-wave plate: certain thickness birefringece crystal thin slice.When the light transmission of normal incidence, the phasic difference between ordinary light (o light) and non-ordinary light (e light) equals π or its odd-multiple, and such wafer is called 1/2nd wave plates or 1/2 wave plate, is called for short half-wave plate.Linearly polarized light, by after 1/2nd wave plates, be still linearly polarized light, but the vibration plane of its outgoing polarization light and the vibration plane of incident polarized light turns over 2 θ.If θ=45 °, then the vibration plane of emergent light is vertical with the vibration plane of former incident light, and namely when θ=45 °, 1/2nd wave plates can make polarization state half-twist.
Technical scheme of the present invention is:
A kind of Ultra-Violet Laser frequency conversion device having noncritical phase matching frequency multiplication, frequency tripling performance concurrently, comprise fundamental frequency light source, contracting beam system, the first catoptron, nonlinear optical crystal, quarter-wave plate, the second catoptron and filter plate, described contracting beam system, the first catoptron, nonlinear optical crystal, quarter-wave plate, the second catoptron are from left to right laid along light path successively, and described filter plate is arranged on immediately below described first catoptron; The angular bisector of described nonlinear optical crystal X-axis and Z axis, the angle of the polarization direction of the fundamental frequency light produced with fundamental frequency light source is 0-5 °, and the angle of the polarization direction of the fundamental frequency light that the optical axis direction of described quarter-wave plate and fundamental frequency light source produce is 0-5 °; The angle of the central shaft of described first catoptron and light path is 35-55 °; Described nonlinear optical crystal is Gd
xy
1-xcOB crystal, when the fundamental frequency light wavelength that fundamental frequency light source sends is 1064nm, the span of x is 0.18-0.22, and when the fundamental frequency light wavelength that fundamental frequency light source sends is 1053nm, the span of x is 0.11-0.15.
Described fundamental frequency light source produces fundamental frequency light, fundamental frequency light is by contracting beam system, to improve the power density of incident fundamental frequency light, incident fundamental frequency light is through the first catoptron, enter nonlinear optical crystal, the effect of II class frequency multiplication is there is in nonlinear optical crystal, the frequency doubled light produced and residue fundamental frequency light are through quarter-wave plate, incide the second catoptron, return by original optical path after being totally reflected, second time is through quarter-wave plate, again enter nonlinear crystal, by the polarization turning effort of quarter-wave plate, frequency doubled light interacts with the Z axis component of residue fundamental frequency light, there is I class frequency tripling, the frequency tripling ultraviolet light produced is reflected by the first catoptron, residue fundamental frequency light and frequency doubled light is filtered again through filter plate, export pure Ultra-Violet Laser.Like this, be have adjusted the polarization direction of frequency doubled light by the introducing of quarter-wave plate, and the polarization direction of fundamental frequency light is constant, realizes Ultra-Violet Laser and export.
Gd
xy
1-xcOB crystal has congruent melting characteristic, and available czochralski method carries out large scale growth, and has high optical quality.After stoichiometric proportion batching, carry out batch mixing imitation frosted glass, then the polycrystal material of sintering is put into Iridium Crucible, adopt high temperature single crystal pulling stove to grow, grow up to Gd
xy
1-xcOB monocrystalline.Crystal carries out orientation according to optical main axis, and along Y direction cutting, polishing, plated film.Therefore crystalloid Y-direction seeded growth, so crystal utilization factor is high.
Preferred according to the present invention, the angular bisector of described nonlinear optical crystal X-axis and Z axis is parallel to the polarization direction of the fundamental frequency light that fundamental frequency light source produces, and the optical axis direction of described quarter-wave plate is parallel to the polarization direction of the fundamental frequency light that fundamental frequency light source produces.
Preferred according to the present invention, the angle of the central shaft of described first catoptron and light path is 45 °.
Preferred according to the present invention, when the fundamental frequency light wavelength that fundamental frequency light source sends is 1064nm, x=0.2; When the fundamental frequency light wavelength that fundamental frequency light source sends is 1053nm, x=0.13.
Preferred according to the present invention, described Ultra-Violet Laser frequency conversion device also comprises temperature-controlling system and electric rotating platform, described temperature-controlling system comprises temperature control box, and described nonlinear optical crystal is arranged in described temperature control box, and described electric rotating platform is arranged on below described temperature control box.
The advantage herein designed is, the setting of temperature-controlling system and electric rotating platform, to finding optimum temperature and optimum angle matching direction, obtaining larger ultraviolet light and exporting.
Preferred according to the present invention, the temperature-controlled precision of described temperature-controlling system is ± 0.1 DEG C, and described temperature control box two leads to light end face and is provided with the high saturating quartz glass of ultraviolet-infrared broad spectrum; The rotation precision of described electric rotating platform is 0.00125 °.Quartz glass prevents thermal diffusion, plays insulation effect.
Preferred according to the present invention, described contracting beam system comprises the first different plano-convex lens of focal length and the second plano-convex lens;
Described fundamental frequency light source is Nd:YAG mode-locked laser;
Described first catoptron is coated with high thoroughly to 1064nm and 532nm laser, anti-to 355nm ultraviolet light height deielectric-coating;
Described second catoptron is coated with the deielectric-coating be all-trans to 1064nm and 532nm laser;
Described nonlinear optical crystal is that Y cuts Gd
0.2y
0.8cOB, described nonlinear optical crystal is directed according to principal-axes coordinate X, Y, Z axis, and be of a size of 10mm × 10mm × 5mm, two Y-directions are led to light mirror polish and are coated with 1064nm, 532nm, 355nm frequency tripling anti-reflection film; Y cuts Gd
0.2y
0.8cOB refers to: optical direction is Y-axis, along the polishing of vertical crystal Y-axis plane cutting;
Described quarter-wave plate is 532nm mica quarter-wave plate;
Described filter plate is made up of quartz, is coated with high anti-, saturating to the 355nm laser height deielectric-coating of 1064nm and 532nm laser.
Preferred according to the present invention, be provided with Faraday polarization apparatus between described fundamental frequency light source and described contracting beam system;
Described contracting beam system comprises the first different plano-convex lens of focal length and the second plano-convex lens;
Described fundamental frequency light source is neodymium glass mode-locked laser;
Described first catoptron is coated with high thoroughly to 1053nm and 526nm laser, anti-to 351nm ultraviolet light height deielectric-coating;
Described second catoptron is coated with the deielectric-coating be all-trans to 1053nm and 526nm laser;
Described nonlinear optical crystal is that Y cuts Gd
0.13y
0.87cOB, described nonlinear optical crystal is directed according to principal-axes coordinate X, Y, Z axis, and be of a size of 12nm × 16mm × 29mm, two Y-directions are led to light mirror polish and are coated with 1053nm fundamental frequency, 526nm frequency multiplication, 351nm frequency tripling anti-reflection film; Y cuts Gd
0.13y
0.87cOB refers to: optical direction is Y-axis, along the polishing of vertical crystal Y-axis plane cutting;
Described quarter-wave plate is 526nm mica quarter-wave plate;
Described filter plate is made up of quartz, is coated with high anti-, saturating to the 351nm laser height deielectric-coating of 1053nm and 526nm laser.
The method of work of above-mentioned Ultra-Violet Laser frequency conversion device, concrete steps comprise:
(1) described fundamental frequency light source produces fundamental frequency light; Ensure that its polarization direction is parallel with the angular bisector of Z axis and the optical axis direction of quarter-wave plate with crystal X-axis.
(2) fundamental frequency light is by described contracting beam system, through described first catoptron, enter described nonlinear optical crystal, the effect of II class frequency multiplication is there is in described nonlinear optical crystal, produce polarization direction be positioned at the frequency doubled light of X-axis and remain fundamental frequency light through described quarter-wave plate, because fundamental frequency light polarization direction is parallel with wave plate optical axis, so fundamental frequency light polarization direction is constant, and frequency doubled light due to its polarization direction and wave plate optical axis included angle be 45 °, circularly polarized light is become from linearly polarized light, incide the second catoptron, return by original optical path after being totally reflected;
(3) second time is through quarter-wave plate, fundamental frequency light polarization direction is still constant, but frequency doubled light twice is through quarter-wave plate, now quarter-wave plate plays half-wave plate effect, frequency doubled light polarization direction half-twist is in crystal Z axis, frequency doubled light and fundamental frequency light enter nonlinear crystal again, by the polarization turning effort of quarter-wave plate, frequency doubled light interacts with the Z axis component of residue fundamental frequency light, there is I class frequency tripling, the frequency tripling ultraviolet light produced is reflected by the first catoptron, residue fundamental frequency light and frequency doubled light is filtered again through filter plate, export pure Ultra-Violet Laser.
Beneficial effect of the present invention is:
The present invention solves the polarized matching problem of frequency tripling by quarter-wave plate, makes one piece of Gd
xy
1-xcOB can simultaneously as frequency multiplication and frequency tripling crystal.The optical elements such as quarter-wave plate used are all full-fledged, be easy in the market buy, and price is well below nonlinear crystal, therefore, cost of manufacture well below the frequency tripling device using at present two blocks of nonlinear crystals, and processing and assembling more convenient.Meanwhile, the characteristic of noncritical phase matching also makes this device wafer raw material availability high, and larger tolerance angle reduces the requirement to fundamental frequency light beam quality, improves output stability, is conducive to large-scale production and application.
Accompanying drawing explanation
Fig. 1 (a) is the schematic diagram of existing frequency tripling implementation;
In Fig. 1 (a), first carry out the frequency multiplication of infrared fundamental frequency light ω with one block of nonlinear optical crystal, frequency doubled light 2 ω produced and residue fundamental frequency light ω again in another block nonlinear optical crystal and frequently, finally realize ultraviolet light 3 ω and export.
Fig. 1 (b) is the schematic diagram of frequency tripling implementation of the present invention;
In Fig. 1 (b), after frequency multiplication occurs, pass through quarter-wave plate, change the polarization state of frequency doubled light, by after the total reflection of the second catoptron again by quarter-wave plate and crystal, make the frequency doubled light (2 ω) of required polarization state and residue fundamental frequency light (ω) component in crystal and frequency, and by the first catoptron reflex, finally realize ultraviolet light (3 ω) and export.
Fig. 2 (a) is fundamental frequency light and frequency doubled light polarization schematic diagram when II class frequency multiplication occurs;
In Fig. 2 (a), after fundamental frequency light enters crystal, Orthogonal Decomposition occurs, and realize II class frequency multiplication, the frequency doubled light polarization direction of generation is positioned at crystal X-axis.
Fig. 2 (b) is fundamental frequency light, frequency doubled light and frequency tripling ultraviolet light polarization schematic diagram when I class frequency tripling occurs.
In Fig. 2 (b), through quarter-wave plate effect and the reflection of the second catoptron, frequency doubled light to Z axis after fundamental frequency light and polarization direction half-twist enters in crystal again, frequency doubled light and the effect of fundamental frequency light Z axis component, realize I class frequency tripling, the frequency tripling ultraviolet light polarization direction of generation is positioned at X-axis.
Fig. 3 is the structural representation of the Ultra-Violet Laser frequency conversion device described in the embodiment of the present invention 1;
Fig. 4 is the structural representation of the Ultra-Violet Laser frequency conversion device described in the embodiment of the present invention 2;
Fig. 5 is the structural representation of the Ultra-Violet Laser frequency conversion device described in the embodiment of the present invention 3;
Fig. 6 is the actual measurement output spectrum figure of the Ultra-Violet Laser frequency conversion device described in the embodiment of the present invention 3.
Wherein, 1, fundamental frequency light source; 2, the first plano-convex lens; 3, the second plano-convex lens; 4, the first catoptron; 5, nonlinear optical crystal; 6, quarter-wave plate; 7, the second catoptron; 8, filter plate; 9, temperature control box; 10, electric rotating platform; 11, Faraday polarization apparatus.
Embodiment
Below in conjunction with Figure of description and embodiment, the present invention is further qualified, but is not limited thereto.
Embodiment 1
A kind of Ultra-Violet Laser frequency conversion device having noncritical phase matching frequency multiplication, frequency tripling performance concurrently, comprise fundamental frequency light source 1, contracting beam system, the first catoptron 4, nonlinear optical crystal 5, quarter-wave plate 6, second catoptron 7 and filter plate 8, described contracting beam system, the first catoptron 4, nonlinear optical crystal 5, quarter-wave plate 6, second catoptron 7 are from left to right laid along light path successively, and described filter plate 8 is arranged on immediately below described first catoptron 4; The angular bisector of described nonlinear optical crystal 5X axle and Z axis is parallel to the polarization direction of the fundamental frequency light that fundamental frequency light source 1 produces, and the optical axis direction of described quarter-wave plate 6 is parallel to the polarization direction of the fundamental frequency light that fundamental frequency light source 1 produces.Described first catoptron 4 is 45 ° with the angle of the central shaft of light path.
Described fundamental frequency light source 1 produces fundamental frequency light, fundamental frequency light is by contracting beam system, to improve the power density of incident fundamental frequency light, incident fundamental frequency light is through the first catoptron 4, enter nonlinear optical crystal 5, the effect of II class frequency multiplication is there is in nonlinear optical crystal 5, the frequency doubled light produced and residue fundamental frequency light are through quarter-wave plate 6, incide the second catoptron 7, return by original optical path after being totally reflected, second time is through quarter-wave plate 6, again enter nonlinear crystal 5, by the polarization turning effort of quarter-wave plate 6, frequency doubled light interacts with the Z axis component of residue fundamental frequency light, there is I class frequency tripling, the frequency tripling ultraviolet light produced is reflected by the first catoptron 4, residue fundamental frequency light and frequency doubled light is filtered again through filter plate 8, export pure Ultra-Violet Laser.Like this, be have adjusted the polarization direction of frequency doubled light by the introducing of quarter-wave plate 6, and the polarization direction of fundamental frequency light is constant, realizes Ultra-Violet Laser and export.The schematic diagram of frequency tripling implementation of the present invention is as shown in Fig. 1 (b).When II class frequency multiplication occurs, fundamental frequency light and frequency doubled light polarization schematic diagram are as shown in Fig. 2 (a); When I class frequency tripling occurs, fundamental frequency light, frequency doubled light and frequency tripling ultraviolet light polarization schematic diagram are as shown in Fig. 2 (b);
Gd
xy
1-xcOB crystal has congruent melting characteristic, and available czochralski method carries out large scale growth, and has high optical quality.After stoichiometric proportion batching, carry out batch mixing imitation frosted glass, then the polycrystal material of sintering is put into Iridium Crucible, adopt high temperature single crystal pulling stove to grow, grow up to Gd
xy
1-xcOB monocrystalline.Crystal carries out orientation according to optical main axis, and along Y direction cutting, polishing, plated film.Therefore crystalloid Y-direction seeded growth, so crystal utilization factor is high.
Described contracting beam system comprises the first different plano-convex lens 2 and the second plano-convex lens 3 of focal length;
Described fundamental frequency light source 1 is Nd:YAG mode-locked laser, and the fundamental frequency light wavelength that Nd:YAG mode-locked laser sends is 1064nm, x=0.2.
Described first catoptron 4 is coated with high thoroughly to 1064nm and 532nm laser, anti-to 355nm ultraviolet light height deielectric-coating;
Described second catoptron 7 is coated with the deielectric-coating be all-trans to 1064nm and 532nm laser;
Described nonlinear optical crystal 5 cuts Gd for Y
0.2y
0.8cOB, described nonlinear optical crystal 5 is directed according to principal-axes coordinate X, Y, Z axis, and be of a size of 10mm × 10mm × 5mm, two Y-directions are led to light mirror polish and are coated with 1064nm, 532nm, 355nm frequency tripling anti-reflection film; Y cuts Gd
0.2y
0.8cOB refers to: optical direction is Y-axis, along the polishing of vertical crystal Y-axis plane cutting;
Described quarter-wave plate 6 is 532nm mica quarter-wave plate;
Described filter plate 8 is made up of quartz, is coated with high anti-, saturating to the 355nm laser height deielectric-coating of 1064nm and 532nm laser.
The structural representation of Ultra-Violet Laser frequency conversion device described in the present embodiment as shown in Figure 3.
Embodiment 2
A kind of Ultra-Violet Laser frequency conversion device having noncritical phase matching frequency multiplication, frequency tripling performance concurrently according to embodiment 1, its difference is, described Ultra-Violet Laser frequency conversion device also comprises temperature-controlling system and electric rotating platform 10, described temperature-controlling system comprises temperature control box 9, described nonlinear optical crystal 5 is arranged in described temperature control box 9, and described electric rotating platform 10 is arranged on below described temperature control box 9.
The advantage herein designed is, the setting of temperature-controlling system and electric rotating platform 10, to finding optimum temperature and optimum angle matching direction, obtaining larger ultraviolet light and exporting.
The temperature-controlled precision of described temperature-controlling system is ± 0.1 DEG C, and the logical light end face of described temperature control box 9 liang is provided with the high saturating quartz glass of ultraviolet-infrared broad spectrum; The rotation precision of described electric rotating platform 10 is 0.00125 °.Quartz glass prevents thermal diffusion, plays insulation effect.
The structural representation of Ultra-Violet Laser frequency conversion device described in the present embodiment as shown in Figure 4.
Embodiment 3
A kind of Ultra-Violet Laser frequency conversion device having noncritical phase matching frequency multiplication, frequency tripling performance concurrently, comprise fundamental frequency light source 1, contracting beam system, the first catoptron 4, nonlinear optical crystal 5, quarter-wave plate 6, second catoptron 7 and filter plate 8, described contracting beam system, the first catoptron 4, nonlinear optical crystal 5, quarter-wave plate 6, second catoptron 7 are from left to right laid along light path successively, and described filter plate 8 is arranged on immediately below described first catoptron 4; The angular bisector of described nonlinear optical crystal 5X axle and Z axis is parallel to the polarization direction of the fundamental frequency light that fundamental frequency light source 1 produces, and the optical axis direction of described quarter-wave plate 6 is parallel to the polarization direction of the fundamental frequency light that fundamental frequency light source 1 produces.Described first catoptron 4 is 45 ° with the angle of the central shaft of light path.
Described fundamental frequency light source 1 produces fundamental frequency light, fundamental frequency light is by contracting beam system, to improve the power density of incident fundamental frequency light, incident fundamental frequency light is through the first catoptron 4, enter nonlinear optical crystal 5, the effect of II class frequency multiplication is there is in nonlinear optical crystal 5, the frequency doubled light produced and residue fundamental frequency light are through quarter-wave plate 6, incide the second catoptron 7, return by original optical path after being totally reflected, second time is through quarter-wave plate 6, again enter nonlinear crystal 5, by the polarization turning effort of quarter-wave plate 6, frequency doubled light interacts with the Z axis component of residue fundamental frequency light, there is I class frequency tripling, the frequency tripling ultraviolet light produced is reflected by the first catoptron 4, residue fundamental frequency light and frequency doubled light is filtered again through filter plate 8, export pure Ultra-Violet Laser.Like this, be have adjusted the polarization direction of frequency doubled light by the introducing of quarter-wave plate 6, and the polarization direction of fundamental frequency light is constant, realizes Ultra-Violet Laser and export.
Gd
xy
1-xcOB crystal has congruent melting characteristic, and available czochralski method carries out large scale growth, and has high optical quality.After stoichiometric proportion batching, carry out batch mixing imitation frosted glass, then the polycrystal material of sintering is put into Iridium Crucible, adopt high temperature single crystal pulling stove to grow, grow up to Gd
xy
1-xcOB monocrystalline.Crystal carries out orientation according to optical main axis, and along Y direction cutting, polishing, plated film.Therefore crystalloid Y-direction seeded growth, so crystal utilization factor is high.
Faraday polarization apparatus 11 is provided with between described fundamental frequency light source 1 and described contracting beam system;
Described contracting beam system comprises the first different plano-convex lens 2 and the second plano-convex lens 3 of focal length;
Described fundamental frequency light source 1 is neodymium glass mode-locked laser, and the fundamental frequency light wavelength that neodymium glass mode-locked laser sends is 1053nm;
Described first catoptron 4 is coated with high thoroughly to 1053nm and 526nm laser, anti-to 351nm ultraviolet light height deielectric-coating;
Described second catoptron 7 is coated with the deielectric-coating be all-trans to 1053nm and 526nm laser;
Described nonlinear optical crystal 5 cuts Gd for Y
0.13y
0.87cOB, described nonlinear optical crystal 5 is directed according to principal-axes coordinate X, Y, Z axis, and be of a size of 12nm × 16mm × 29mm, two Y-directions are led to light mirror polish and are coated with 1053nm fundamental frequency, 526nm frequency multiplication, 351nm frequency tripling anti-reflection film; Y cuts Gd
0.13y
0.87cOB refers to: optical direction is Y-axis, along the polishing of vertical crystal Y-axis plane cutting;
Described quarter-wave plate 6 is 526nm mica quarter-wave plate;
The structural representation of Ultra-Violet Laser frequency conversion device described in the present embodiment as shown in Figure 5.
The actual measurement output spectrum figure of the Ultra-Violet Laser frequency conversion device described in the present embodiment as shown in Figure 6; In Fig. 6, when 1053nm frequency tripling realizes, recorded the spectrogram of exported ultraviolet light by spectrometer, centre wavelength is positioned at 351 nanometers, proves that frequency tripling is achieved.
Embodiment 4
The method of work of the arbitrary described Ultra-Violet Laser frequency conversion device of embodiment 1-3, concrete steps comprise:
(1) described fundamental frequency light source 1 produces fundamental frequency light; Ensure that its polarization direction is parallel with the angular bisector of Z axis and the optical axis direction of quarter-wave plate with crystal X-axis.
(2) fundamental frequency light is by described contracting beam system, through described first catoptron 4, enter described nonlinear optical crystal 5, the effect of II class frequency multiplication is there is in described nonlinear optical crystal 5, produce polarization direction be positioned at the frequency doubled light of X-axis and remain fundamental frequency light through described quarter-wave plate 6, because fundamental frequency light polarization direction is parallel with wave plate optical axis, so fundamental frequency light polarization direction is constant, and frequency doubled light due to its polarization direction and wave plate optical axis included angle be 45 °, circularly polarized light is become from linearly polarized light, incide the second catoptron 7, return by original optical path after being totally reflected;
(3) second time is through quarter-wave plate 6, fundamental frequency light polarization direction is still constant, but frequency doubled light twice is through quarter-wave plate 6, now quarter-wave plate 6 plays half-wave plate effect, frequency doubled light polarization direction half-twist is in crystal Z axis, frequency doubled light and fundamental frequency light enter nonlinear crystal 5 again, by the polarization turning effort of quarter-wave plate 6, frequency doubled light interacts with the Z axis component of residue fundamental frequency light, there is I class frequency tripling, the frequency tripling ultraviolet light produced is reflected by the first catoptron 4, residue fundamental frequency light and frequency doubled light is filtered again through filter plate 8, export pure Ultra-Violet Laser.
Claims (9)
1. one kind has the Ultra-Violet Laser frequency conversion device of noncritical phase matching frequency multiplication, frequency tripling performance concurrently, it is characterized in that, comprise fundamental frequency light source, contracting beam system, the first catoptron, nonlinear optical crystal, quarter-wave plate, the second catoptron and filter plate, described contracting beam system, the first catoptron, nonlinear optical crystal, quarter-wave plate, the second catoptron are from left to right laid along light path successively, and described filter plate is arranged on immediately below described first catoptron; The angular bisector of described nonlinear optical crystal X-axis and Z axis, the angle of the polarization direction of the fundamental frequency light produced with fundamental frequency light source is 0-5 °, and the angle of the polarization direction of the fundamental frequency light that the optical axis direction of described quarter-wave plate and fundamental frequency light source produce is 0-5 °; The angle of the central shaft of described first catoptron and light path is 35-55 °; Described nonlinear optical crystal is Gd
xy
1-xcOB crystal, when the fundamental frequency light wavelength that fundamental frequency light source sends is 1064nm, the span of x is 0.18-0.22, and when the fundamental frequency light wavelength that fundamental frequency light source sends is 1053nm, the span of x is 0.11-0.15.
2. a kind of Ultra-Violet Laser frequency conversion device having noncritical phase matching frequency multiplication, frequency tripling performance concurrently according to claim 1, it is characterized in that, the angular bisector of described nonlinear optical crystal X-axis and Z axis is parallel to the polarization direction of the fundamental frequency light that fundamental frequency light source produces, and the optical axis direction of described quarter-wave plate is parallel to the polarization direction of the fundamental frequency light that fundamental frequency light source produces.
3. a kind of Ultra-Violet Laser frequency conversion device having noncritical phase matching frequency multiplication, frequency tripling performance concurrently according to claim 1, it is characterized in that, the angle of the central shaft of described first catoptron and light path is 45 °.
4. a kind of Ultra-Violet Laser frequency conversion device having noncritical phase matching frequency multiplication, frequency tripling performance concurrently according to claim 1, is characterized in that, when the fundamental frequency light wavelength that fundamental frequency light source sends is 1064nm, and x=0.2; When the fundamental frequency light wavelength that fundamental frequency light source sends is 1053nm, x=0.13.
5. a kind of Ultra-Violet Laser frequency conversion device having noncritical phase matching frequency multiplication, frequency tripling performance concurrently according to claim 1, it is characterized in that, described Ultra-Violet Laser frequency conversion device also comprises temperature-controlling system and electric rotating platform, described temperature-controlling system comprises temperature control box, described nonlinear optical crystal is arranged in described temperature control box, and described electric rotating platform is arranged on below described temperature control box.
6. a kind of Ultra-Violet Laser frequency conversion device having noncritical phase matching frequency multiplication, frequency tripling performance concurrently according to claim 5, it is characterized in that, the temperature-controlled precision of described temperature-controlling system is ± 0.1 DEG C, and described temperature control box two leads to light end face and is provided with the high saturating quartz glass of ultraviolet-infrared broad spectrum; The rotation precision of described electric rotating platform is 0.00125 °.
7. a kind of Ultra-Violet Laser frequency conversion device having noncritical phase matching frequency multiplication, frequency tripling performance concurrently according to claim 1, it is characterized in that, described contracting beam system comprises the first different plano-convex lens of focal length and the second plano-convex lens;
Described fundamental frequency light source is Nd:YAG mode-locked laser;
Described first catoptron is coated with high thoroughly to 1064nm and 532nm laser, anti-to 355nm ultraviolet light height deielectric-coating;
Described second catoptron is coated with the deielectric-coating be all-trans to 1064nm and 532nm laser;
Described nonlinear optical crystal is that Y cuts Gd
0.2y
0.8cOB, described nonlinear optical crystal is directed according to principal-axes coordinate X, Y, Z axis, and be of a size of 10mm × 10mm × 5mm, two Y-directions are led to light mirror polish and are coated with 1064nm, 532nm, 355nm frequency tripling anti-reflection film;
Described quarter-wave plate is 532nm mica quarter-wave plate;
Described filter plate is made up of quartz, is coated with high anti-, saturating to the 355nm laser height deielectric-coating of 1064nm and 532nm laser.
8. a kind of Ultra-Violet Laser frequency conversion device having noncritical phase matching frequency multiplication, frequency tripling performance concurrently according to claim 1, is characterized in that, be provided with Faraday polarization apparatus between described fundamental frequency light source and described contracting beam system;
Described contracting beam system comprises the first different plano-convex lens of focal length and the second plano-convex lens;
Described fundamental frequency light source is neodymium glass mode-locked laser;
Described first catoptron is coated with high thoroughly to 1053nm and 526nm laser, anti-to 351nm ultraviolet light height deielectric-coating;
Described second catoptron is coated with the deielectric-coating be all-trans to 1053nm and 526nm laser;
Described nonlinear optical crystal is that Y cuts Gd
0.13y
0.87cOB, described nonlinear optical crystal is directed according to principal-axes coordinate X, Y, Z axis, and be of a size of 12nm × 16mm × 29mm, two Y-directions are led to light mirror polish and are coated with 1053nm fundamental frequency, 526nm frequency multiplication, 351nm frequency tripling anti-reflection film;
Described quarter-wave plate is 526nm mica quarter-wave plate;
Described filter plate is made up of quartz, is coated with high anti-, saturating to the 351nm laser height deielectric-coating of 1053nm and 526nm laser.
9., according to the arbitrary described a kind of method of work of Ultra-Violet Laser frequency conversion device having noncritical phase matching frequency multiplication, frequency tripling performance concurrently of claim 1-8, it is characterized in that concrete steps comprise:
(1) described fundamental frequency light source produces fundamental frequency light;
(2) fundamental frequency light is by described contracting beam system, through described first catoptron, enter described nonlinear optical crystal, the effect of II class frequency multiplication is there is in described nonlinear optical crystal, produce polarization direction be positioned at the frequency doubled light of X-axis and remain fundamental frequency light through described quarter-wave plate, become circularly polarized light from linearly polarized light, incide the second catoptron, return by original optical path after being totally reflected;
(3) second time is through quarter-wave plate, fundamental frequency light polarization direction is still constant, frequency doubled light polarization direction half-twist is in crystal Z axis, frequency doubled light and fundamental frequency light enter nonlinear crystal again, and by the polarization turning effort of quarter-wave plate, frequency doubled light interacts with the Z axis component of residue fundamental frequency light, there is I class frequency tripling, the frequency tripling ultraviolet light produced is reflected by the first catoptron, then filters residue fundamental frequency light and frequency doubled light through filter plate, exports pure Ultra-Violet Laser.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105911793A (en) * | 2016-06-28 | 2016-08-31 | 山东大学 | Cascaded optical frequency converter based on monolithic phosphate crystal and application of cascaded optical frequency converter |
| CN106058630A (en) * | 2016-07-04 | 2016-10-26 | 深圳市杰普特光电股份有限公司 | End-pumped green laser |
| CN108363258A (en) * | 2018-01-08 | 2018-08-03 | 东南大学 | A kind of device and method generating ultraviolet band vector beam |
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| CN108775966A (en) * | 2018-09-05 | 2018-11-09 | 中国工程物理研究院激光聚变研究中心 | A kind of double delay third-order relevant instruments |
| CN111897135A (en) * | 2020-07-16 | 2020-11-06 | 江苏维福特科技发展股份有限公司 | Method for generating 180nm-290nm deep ultraviolet light |
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| CN112269260A (en) * | 2020-09-27 | 2021-01-26 | 北京卓镭激光技术有限公司 | Laser switching device and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295679A (en) * | 1998-03-27 | 2001-05-16 | 科学技术振兴事业团 | Wavelength conversion crystal and method for generating laser beam, and apparatus for generating laser beam |
| JP2010135380A (en) * | 2008-12-02 | 2010-06-17 | Omron Corp | Solid state laser oscillator |
| JP2015035469A (en) * | 2013-08-08 | 2015-02-19 | 株式会社島津製作所 | Solid-state laser device |
| CN205405031U (en) * | 2016-03-14 | 2016-07-27 | 山东大学 | Have ultraviolet laser converter of non -critical phase matching doubling of frequency, frequency tripling performance concurrently |
-
2016
- 2016-03-14 CN CN201610144858.4A patent/CN105549295B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295679A (en) * | 1998-03-27 | 2001-05-16 | 科学技术振兴事业团 | Wavelength conversion crystal and method for generating laser beam, and apparatus for generating laser beam |
| JP2010135380A (en) * | 2008-12-02 | 2010-06-17 | Omron Corp | Solid state laser oscillator |
| JP2015035469A (en) * | 2013-08-08 | 2015-02-19 | 株式会社島津製作所 | Solid-state laser device |
| CN205405031U (en) * | 2016-03-14 | 2016-07-27 | 山东大学 | Have ultraviolet laser converter of non -critical phase matching doubling of frequency, frequency tripling performance concurrently |
Non-Patent Citations (1)
| Title |
|---|
| SHUJUN ZHANG 等: "Growth and noncritical phase-matching third-harmonic-generation of GdxY1-xCa4O(BO3)3 crystal", 《JOURNAL OF CRYSTAL GROWTH》 * |
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| CN105911793A (en) * | 2016-06-28 | 2016-08-31 | 山东大学 | Cascaded optical frequency converter based on monolithic phosphate crystal and application of cascaded optical frequency converter |
| CN106058630A (en) * | 2016-07-04 | 2016-10-26 | 深圳市杰普特光电股份有限公司 | End-pumped green laser |
| CN108363258A (en) * | 2018-01-08 | 2018-08-03 | 东南大学 | A kind of device and method generating ultraviolet band vector beam |
| CN108363258B (en) * | 2018-01-08 | 2021-05-04 | 东南大学 | Device and method for generating ultraviolet band vector light beam |
| CN108761622A (en) * | 2018-08-17 | 2018-11-06 | 山东大学 | A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity and the preparation method and application thereof |
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