CN205405031U - Have ultraviolet laser converter of non -critical phase matching doubling of frequency, frequency tripling performance concurrently - Google Patents
Have ultraviolet laser converter of non -critical phase matching doubling of frequency, frequency tripling performance concurrently Download PDFInfo
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- CN205405031U CN205405031U CN201620195012.9U CN201620195012U CN205405031U CN 205405031 U CN205405031 U CN 205405031U CN 201620195012 U CN201620195012 U CN 201620195012U CN 205405031 U CN205405031 U CN 205405031U
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Abstract
The utility model relates to a have ultraviolet laser converter of non -critical phase matching doubling of frequency, frequency tripling performance concurrently, including the base frequency light source, the contract system of restrainting, first speculum, nonlinear optical crystal, fourth wave plate, the second mirror and filter plate, the angular bisector of nonlinear optical crystal X axle and Z axle is 0 with the the polarization direction's of base frequency light contained angle 5, is the optical axis direction of fourth wave plate 0 with the the polarization direction's of base frequency light contained angle 5 is first speculum 35 with the contained angle of the center pin of light path 55 is nonlinear optical crystal gdxY1 the xCOB crystal, was x's value range 0.18 when the base frequency optical wavelength was 1064nm 0.22, was x's value range 0.11 when the base frequency optical wavelength was 1053nm 0.15. The utility model discloses do you make a gdxY1 XCOB regards as doubling of frequency and frequency tripling crystal simultaneously, and the cost of manufacture is low.
Description
Technical field
The utility model relates to a kind of Ultra-Violet Laser frequency conversion device having noncritical phase matching frequency multiplication, frequency tripling performance concurrently, belongs to sharp
Light and nonlinear optical technology field.
Background technology
In modern technologies, laser instrument plays the most important role.Wherein, all-solid-state ultraviolet laser (bores in Laser Micro-Machining
Hole, cut and corrode), laser chemistry, optics engraving, rapid shaping, the field such as laser printing and spectroscopy suffer from weighing very much
The application wanted.Owing to the wavelength of practical solid state laser is all located at greatly infrared spectral region, in order to obtain ultraviolet light, need to use non-thread
Property optical crystal carries out frequency transformation to infrared laser, and this method has that efficiency height, good beam quality, volume be little, stability
The advantages such as height and life-span length.At present, the most frequently used technology path is to neodymium-doped yttrium-aluminum garnet or nd glass laser
(1064nm/1053nm) carrying out frequency tripling, thus obtain the ultraviolet output of 355nm/351nm, this process comprises two steps: first
The frequency multiplication of infrared fundamental frequency light, produced frequency doubling green light (532nm/526nm) and residue is first carried out with one block of nonlinear optical crystal
Fundamental frequency light again in another block nonlinear optical crystal and frequency, finally realize 355nm/351nm ultraviolet light output.Such as Fig. 1 (a)
Shown in, two pieces of crystal are used separately as frequency multiplication and frequency tripling crystal.At present, conventional frequency-doubling crystal is KH2PO4(KDP)、
KTiOPO4And LiB (KTP)3O5(LBO), frequency tripling crystal is KDP, LBO and β-BaB2O4(BBO).Even if frequency multiplication and three times
Frequency uses same crystal, owing to phase matched direction is different, so space corner cut is different, therefore, inevitably
Use two pieces of crystal, so that raw material and processing cost greatly improve.
Frequency tripling light is directly exported, it is necessary to solve two key issues for realizing one block of nonlinear crystal.(1) find suitably
GdxY1-xCOB crystal, i.e. determines component parameter x.(2) requirement to polarization state of the phase matched mode is met.From principle
From the point of view of, even if finding suitable crystal composition to make frequency multiplication, frequency tripling phase matched direction all be adjusted to GdxY1-xThe Y of COB crystal
On axle, if the polarization state of frequency doubled light is not adjusted, frequency tripling light also cannot be exported.Reason is II class noncritical phase
Join the polarization direction X-axis (quick shaft direction) along crystal of produced frequency doubled light, and I class noncritical phase matching frequency tripling requires again
Frequently light polarization direction is along the Z axis (slow-axis direction) of crystal.
GdxY1-xCa4O(BO3)3(GdxY1-xCOB) series borate crystal is that a kind of refractive index can be with continually varying displaced type solid solution
Body, and then the continuously adjustabe of noncritical phase matching wavelength can be realized.This crystalloid have effective nonlinear optical coefficient moderate,
Transmission region width, threshold for resisting laser damage are high, phase matching ranges greatly, not deliquescence and the advantage such as physico-chemical property is stable, be a class
The nonlinear optical crystal of function admirable, has broad prospect of application.Research shows: along GdxY1-xCOB serial crystal Y-axis, i.e.
(90 °, 90 °) phase matched direction, can realize, by composition regulation, the noncritical phase that wavelength is 1064nm/1053nm
Coupling II class frequency multiplication and I class frequency tripling, 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 utility model provides and a kind of has noncritical phase matching frequency multiplication, frequency tripling performance concurrently
Ultra-Violet Laser frequency conversion device.
The utility model first realizes non-critical frequency multiplication with one piece of crystal and realizes non-critical frequency tripling again, it is thus achieved that 355nm/351nm ultraviolet
Light exports, and low cost, volume are little, processing is convenient, it is simple to large-scale promotion.
Term is explained
1, phase matched: during nonlinear optical frequency conversion, incident light wave produces harmonics polarized wave the local of its process,
These harmonics polarized waves are propagated in crystal and interfere, and its result is exactly to measure the harmonic wave overall strength arrived.This intensity with
Produced by each position, harmonic phase difference is relevant, if phase difference is zero, i.e. phase place is consistent, then harmonic wave is effectively strengthened；As
Really phase difference is inconsistent, then harmonic wave will be cancelled out each other；Do not observe harmonic wave the most completely.Obviously, incident light wave is only worked as
Spread speed equal with the spread speed of harmonic wave time, the harmonic wave that in crystal, each position produces just unanimously and mutually strengthens because of phase place,
This situation is referred to as phase matched.Say in principle that in nonlinear optical crystal, the phase matched of three wave interactions has two types: frequently
Rate is ω1Light wave and frequency be ω2Light wave there is identical linear polarization, then phase matched is I class；Otherwise, light wave ω1
With light wave ω2Have orthogonal linear polarization, then phase matched is II class.
2, noncritical phase matching (NCPM): refer to the phase matched along principal-axes coordinate direction for biaxal crystal, other feelings
Phase matched under condition is referred to as critical phase matched (CPM).Compared with CPM, NCPM has tolerance angle big, deviation angle be zero and
The advantage that crystal utilization rate is high, the most also referred to as optimum angle coupling.
3, frequency multiplication (SHG): optical frequency-doubling is also known as optical second harmonic, refers to due to light and nonlinear dielectric (usually crystal)
Interacting, the fundamental frequency light making frequency be ω is changed into the phenomenon of the frequency doubled light of 2 ω.
4, frequency tripling (THG): frequency tripling is also known as optics triple-frequency harmonics, refers to that the fundamental frequency light that frequency is ω is 2 ω's with frequency
Frequency doubled light interacts in crystal, becomes the phenomenon of the light that frequency is 3 ω.
5, wave plate: can make to produce between mutually perpendicular two light vibration the optics of additional light path (or phase difference).Generally by
Having the birefringence wafers such as the quartz of precise thickness, calcite or mica to make, 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, ordinary light (o light)
With the phasic difference between non-ordinary light (e light) is equal to pi/2 or its odd-multiple, such wafer is referred to as quarter-wave plate or 1/4
Wave plate.When the incident vibration plane of polarised light and the angle theta of wave plate optical axis are 45 °, by the linearly polarized light of quarter-wave plate
Become circularly polarized light, otherwise, when circularly polarized light is after quarter-wave plate, then become linearly polarized light.When light passes twice through four
During/mono-wave plate, function as 1/2nd wave plates.
7, half-wave plate: certain thickness birefringece crystal thin slice.When the light transmission of normal incidence, ordinary light (o light) and very
Phasic difference between light (e light) is equal to π or its odd-multiple, and such wafer is referred to as 1/2nd wave plates or 1/2 wave plate, is called for short half
Wave plate.After linearly polarized light passes through 1/2nd wave plates, it is still linearly polarized light, but, the vibration plane of its outgoing polarization light is with incident
The vibration plane of polarised 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, i.e. works as θ
When=45 °, 1/2nd wave plates can make polarization state half-twist.
The technical solution of the utility model is:
A kind of Ultra-Violet Laser frequency conversion device having noncritical phase matching frequency multiplication, frequency tripling performance concurrently, including fundamental frequency light source, contracting bundle be
System, the first speculum, nonlinear optical crystal, quarter-wave plate, the second speculum and filter plate, described contracting beam system,
First speculum, nonlinear optical crystal, quarter-wave plate, the second speculum are laid along light path the most successively, described
Filter plate is arranged on the underface of described first speculum；Described nonlinear optical crystal X-axis and the angular bisector of Z axis, with base
Frequently the angle of the polarization direction of the fundamental frequency light that light source produces is 0-5 °, the optical axis direction of described quarter-wave plate and fundamental frequency light source
The angle of the polarization direction of the fundamental frequency light produced is 0-5 °；Described first speculum is 35-55 with the angle of the central shaft of light path
°；Described nonlinear optical crystal is GdxY1-xCOB crystal, as a length of 1064nm of the fundamental light wave that fundamental frequency light source sends, x
Span be 0.18-0.22, as a length of 1053nm of the fundamental light wave that fundamental frequency light source sends, the span of x is
0.11-0.15。
Described fundamental frequency light source produces fundamental frequency light, and fundamental frequency light is by contracting beam system, to improve the power density of incident fundamental frequency light, incident
Fundamental frequency light passes through the first speculum, enters nonlinear optical crystal, II class frequency multiplication effect occurs in nonlinear optical crystal, produces
Raw frequency doubled light and residue fundamental frequency light, through quarter-wave plate, incide the second speculum, return by original optical path after being totally reflected
Returning, second time, through quarter-wave plate, is again introduced into nonlinear crystal, by the polarization turning effort of quarter-wave plate,
Frequency doubled light interacts with the z-component of residue fundamental frequency light, and I class frequency tripling occurs, and the frequency tripling ultraviolet light of generation is anti-by first
Penetrate mirror reflection, more filtered filters residue fundamental frequency light and frequency doubled light, exports pure Ultra-Violet Laser.So, by four/
The introducing of one wave plate have adjusted the polarization direction of frequency doubled light, and the polarization direction of fundamental frequency light is constant, it is achieved Ultra-Violet Laser exports.
GdxY1-xCOB crystal has congruent melting characteristic, and available czochralski method carries out large scale growth, and has high optics matter
Amount.After stoichiometric proportion dispensing, carry out batch mixing imitation frosted glass, then the polycrystal material of sintering is put into Iridium Crucible, use high temperature
Single crystal pulling stove grows, and grows up to GdxY1-xCOB monocrystalline.Crystal is oriented according to optical main axis, and cuts along Y direction,
Polishing, plated film.Therefore crystalloid Y-direction seeded growth, so crystal utilization rate is high.
Preferred according to the utility model, the angular bisector of described nonlinear optical crystal X-axis and Z axis is parallel to fundamental frequency light source and produces
The polarization direction of raw fundamental frequency light, the optical axis direction of described quarter-wave plate is parallel to the polarization of the fundamental frequency light that fundamental frequency light source produces
Direction.
Preferred according to the utility model, described first speculum is 45 ° with the angle of the central shaft of light path.
Preferred according to the utility model, as a length of 1064nm of the fundamental light wave that fundamental frequency light source sends, x=0.2；Work as fundamental frequency light
During a length of 1053nm of fundamental light wave that source sends, x=0.13.
Preferred according to the utility model, described Ultra-Violet Laser frequency conversion device also includes temperature-controlling system and electric rotating platform, described control
Temperature system includes that temperature control box, described nonlinear optical crystal are arranged in described temperature control box, and described electric rotating platform is arranged on institute
State below temperature control box.
The advantage herein designed is, temperature-controlling system and the setting of electric rotating platform, to finding optimum temperature and optimum angle
Matching direction, it is thus achieved that bigger ultraviolet light exports.
Preferred according to the utility model, 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
It is provided with saturating quartz glass high to ultraviolet-infrared broad spectrum；The rotation precision of described electric rotating platform is 0.00125 °.Stone
English glass prevents thermal diffusion, plays insulation effect.
Preferred according to the utility model, described contracting beam system includes different the first planoconvex spotlight of focal length and the second planoconvex spotlight；
Described fundamental frequency light source is Nd:YAG mode-locked laser；
Described first speculum is coated with anti-deielectric-coating high thoroughly to 1064nm and 532nm laser, high to 355nm ultraviolet light；
Described second speculum is coated with the deielectric-coating being all-trans 1064nm and 532nm laser；
Described nonlinear optical crystal is that Y cuts Gd0.2Y0.8COB, described nonlinear optical crystal is according to principal-axes coordinate X, Y, Z
Axle orients, and a size of 10mm × 10mm × 5mm, two Y-directions are led to light mirror polish and are coated with 1064nm, 532nm, 355nm tri-times
Frequently anti-reflection film；Y cuts Gd0.2Y0.8COB refers to: optical direction is Y-axis, polishes along 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 anti-, to 355nm laser high saturating deielectric-coating high to 1064nm and 532nm laser.
Preferred according to the utility model, it is provided with Faraday polarization apparatus between described fundamental frequency light source and described contracting beam system；
Described contracting beam system includes different the first planoconvex spotlight of focal length and the second planoconvex spotlight；
Described fundamental frequency light source is neodymium glass mode-locked laser；
Described first speculum is coated with anti-deielectric-coating high thoroughly to 1053nm and 526nm laser, high to 351nm ultraviolet light；
Described second speculum is coated with the deielectric-coating being all-trans 1053nm and 526nm laser；
Described nonlinear optical crystal is that Y cuts Gd0.13Y0.87COB, described nonlinear optical crystal is according to principal-axes coordinate X, Y, Z
Axle orients, a size of 12nm × 16mm × 29mm, two Y-directions lead to light mirror polish and be coated with 1053nm fundamental frequency, 526nm frequency multiplication,
351nm frequency tripling anti-reflection film；Y cuts Gd0.13Y0.87COB refers to: optical direction is Y-axis, throws along vertical crystal Y-axis plane cutting
Light；
Described quarter-wave plate is 526nm mica quarter-wave plate；
Described filter plate is made up of quartz, is coated with anti-, to 351nm laser high saturating deielectric-coating high to 1053nm and 526nm laser.
The method of work of above-mentioned Ultra-Violet Laser frequency conversion device, concrete steps include:
(1) described fundamental frequency light source produces fundamental frequency light；Ensure its polarization direction and crystal X-axis and the angular bisector of Z axis and four points
One of the optical axis direction of wave plate parallel.
(2) fundamental frequency light is by described contracting beam system, through described first speculum, enters described nonlinear optical crystal, in institute
State generation II class frequency multiplication effect in nonlinear optical crystal, produce polarization direction and be positioned at frequency doubled light and the residue fundamental frequency light process of X-axis
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 multiplication
Light is 45 ° due to its polarization direction and wave plate optical axis included angle, linearly polarized light become circularly polarized light, incide the second speculum,
Return by original optical path after being totally reflected；
(3) second time is through quarter-wave plate, and fundamental frequency light polarization direction is the most constant, but frequency doubled light twice is through 1/4th
Wave plate, now quarter-wave plate plays half-wave plate effect, frequency doubled light polarization direction half-twist in crystal Z axis, frequency doubled light with
Fundamental frequency light is again introduced into nonlinear crystal, by the polarization turning effort of quarter-wave plate, frequency doubled light and the Z remaining fundamental frequency light
Axle component interacts, and I class frequency tripling occurs, and the frequency tripling ultraviolet light of generation is reflected by the first speculum, more filtered filter
Fall to remain fundamental frequency light and frequency doubled light, export pure Ultra-Violet Laser.
The beneficial effects of the utility model are:
The utility model solves the polarized matching problem of frequency tripling by quarter-wave plate so that one piece of GdxY1-xCOB can be same
Shi Zuowei frequency multiplication and frequency tripling crystal.The optical elements such as quarter-wave plate used all have developed into ripe, hold the most very much
Easily buying, and price is well below nonlinear crystal, therefore, cost of manufacture is well below currently used two blocks of nonlinear crystals
Frequency tripling device, and processing and assemble more convenient.Meanwhile, the characteristic of noncritical phase matching also makes this device wafer raw material profit
High by rate, bigger tolerance angle reduces the requirement to fundamental frequency light beam quality, improves output stability, is conducive to extensive
Produce 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, produced frequency doubled light 2 ω with one block of nonlinear optical crystal
With residue fundamental frequency light ω again in another block nonlinear optical crystal and frequency, finally realize ultraviolet light 3 ω output.
Fig. 1 (b) is the schematic diagram of the utility model frequency tripling implementation；
In Fig. 1 (b), after frequency multiplication occurs, by quarter-wave plate, change the polarization state of frequency doubled light, by the second speculum
Total reflection after again by quarter-wave plate and crystal so that the frequency doubled light (2 ω) of required polarization state with residue fundamental frequency light (ω)
Component is in crystal and frequency, and by the first speculum reflex, finally realizes ultraviolet light (3 ω) output.
Fundamental frequency light and frequency doubled light polarization schematic diagram when Fig. 2 (a) is the generation of II class frequency multiplication；
In Fig. 2 (a), after fundamental frequency light enters crystal, there is Orthogonal Decomposition, it is achieved II class frequency multiplication, the frequency doubled light polarization of generation
Direction is positioned at crystal X-axis.
Fundamental frequency light, frequency doubled light and frequency tripling ultraviolet light polarization schematic diagram when Fig. 2 (b) is the generation of I class frequency tripling.
In Fig. 2 (b), reflect, after fundamental frequency light and polarization direction half-twist through quarter-wave plate effect and the second speculum
Frequency doubled light to Z axis is again introduced in crystal, frequency doubled light and fundamental frequency light z-component effect, it is achieved I class frequency tripling, generation
Frequency tripling ultraviolet light polarization direction is positioned at X-axis.
Fig. 3 is the structural representation of the Ultra-Violet Laser frequency conversion device described in the utility model embodiment 1；
Fig. 4 is the structural representation of the Ultra-Violet Laser frequency conversion device described in the utility model embodiment 2；
Fig. 5 is the structural representation of the Ultra-Violet Laser frequency conversion device described in the utility model embodiment 3；
Fig. 6 is the actual measurement output spectrum figure of the Ultra-Violet Laser frequency conversion device described in the utility model embodiment 3.
Wherein, 1, fundamental frequency light source；2, the first planoconvex spotlight；3, the second planoconvex spotlight；4, the first speculum；5, non-linear
Optical crystal；6, quarter-wave plate；7, the second speculum；8, filter plate；9, temperature control box；10, electric rotating platform；
11, Faraday polarization apparatus.
Detailed description of the invention
Below in conjunction with Figure of description and embodiment, the utility model is further qualified, but is not limited to this.
Embodiment 1
A kind of Ultra-Violet Laser frequency conversion device having noncritical phase matching frequency multiplication, frequency tripling performance concurrently, including fundamental frequency light source 1, contracting bundle
System, the first speculum 4, nonlinear optical crystal 5, quarter-wave plate the 6, second speculum 7 and filter plate 8, described
Contracting beam system, the first speculum 4, nonlinear optical crystal 5, quarter-wave plate the 6, second speculum 7 are the most successively
Laying along light path, described filter plate 8 is arranged on the underface of described first speculum 4；Described nonlinear optical crystal 5X axle and
The angular bisector of Z axis is parallel to the polarization direction of the fundamental frequency light that fundamental frequency light source 1 produces, the optical axis side of described quarter-wave plate 6
To the polarization direction being parallel to the fundamental frequency light that fundamental frequency light source 1 produces.Described first speculum 4 with the angle of the central shaft of light path is
45°。
Described fundamental frequency light source 1 produces fundamental frequency light, and fundamental frequency light, by contracting beam system, to improve the power density of incident fundamental frequency light, enters
Penetrate fundamental frequency light through the first speculum 4, entrance nonlinear optical crystal 5, generation II class frequency multiplication in nonlinear optical crystal 5
Effect, the frequency doubled light of generation and residue fundamental frequency light, through quarter-wave plate 6, incide the second speculum 7, after being totally reflected
Returning by original optical path, second time, through quarter-wave plate 6, is again introduced into nonlinear crystal 5, by quarter-wave plate 6
Polarization turning effort, frequency doubled light interacts with the z-component of residue fundamental frequency light, I class frequency tripling, the frequency tripling of generation occurs
Ultraviolet light is reflected by the first speculum 4, more filtered 8 filters residue fundamental frequency light and frequency doubled light, exports pure Ultra-Violet Laser.
So, 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, real
Existing Ultra-Violet Laser output.Shown in schematic diagram such as Fig. 1 (b) of frequency tripling implementation of the present invention.Fundamental frequency light when II class frequency multiplication occurs
Shown in frequency doubled light polarization schematic diagram such as Fig. 2 (a)；When I class frequency tripling occurs, fundamental frequency light, frequency doubled light and frequency tripling ultraviolet light are inclined
Shake shown in schematic diagram such as Fig. 2 (b)；
GdxY1-xCOB crystal has congruent melting characteristic, and available czochralski method carries out large scale growth, and has high optical quality.
After stoichiometric proportion dispensing, carry out batch mixing imitation frosted glass, then the polycrystal material of sintering is put into Iridium Crucible, use high temperature monocrystalline
Lifting furnace grows, and grows up to GdxY1-xCOB monocrystalline.Crystal is oriented according to optical main axis, and cuts along Y direction, throws
Light, plated film.Therefore crystalloid Y-direction seeded growth, so crystal utilization rate is high.
Described contracting beam system includes the first planoconvex spotlight 2 and the second planoconvex spotlight 3 that focal length is different；
Described fundamental frequency light source 1 is Nd:YAG mode-locked laser, a length of 1064nm of fundamental light wave that Nd:YAG mode-locked laser sends,
X=0.2.
Described first speculum 4 is coated with anti-deielectric-coating high thoroughly to 1064nm and 532nm laser, high to 355nm ultraviolet light；
Described second speculum 7 is coated with the deielectric-coating being all-trans 1064nm and 532nm laser；
Described nonlinear optical crystal 5 cuts Gd for Y0.2Y0.8COB, described nonlinear optical crystal 5 according to principal-axes coordinate X, Y,
Z axis orients, and a size of 10mm × 10mm × 5mm, two Y-directions are led to light mirror polish and are coated with 1064nm, 532nm, 355nm tri-
Frequency Doubling Antireflection Coating；Y cuts Gd0.2Y0.8COB refers to: optical direction is Y-axis, polishes along 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 anti-, to 355nm laser high saturating medium high to 1064nm and 532nm laser
Film.
The structural representation of Ultra-Violet Laser frequency conversion device described in the present embodiment is as shown in Figure 3.
Embodiment 2
According to a kind of Ultra-Violet Laser frequency conversion device having noncritical phase matching frequency multiplication, frequency tripling performance concurrently described in embodiment 1, its
Difference is, described Ultra-Violet Laser frequency conversion device also includes temperature-controlling system and electric rotating platform 10, and described temperature-controlling system includes 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 described temperature control
Below box 9.
The advantage herein designed is, temperature-controlling system and the setting of electric rotating platform 10, to finding optimum temperature and optimum phase
Position matching direction, it is thus achieved that bigger ultraviolet light exports.
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 ultraviolet-infrared wide light
The high saturating quartz glass of spectrum；The rotation precision of described electric rotating platform 10 is 0.00125 °.Quartz glass prevents thermal diffusion,
Play insulation effect.
The structural representation of Ultra-Violet Laser frequency conversion device described in the present embodiment is 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, including fundamental frequency light source 1, contracting bundle
System, the first speculum 4, nonlinear optical crystal 5, quarter-wave plate the 6, second speculum 7 and filter plate 8, described
Contracting beam system, the first speculum 4, nonlinear optical crystal 5, quarter-wave plate the 6, second speculum 7 are the most successively
Laying along light path, described filter plate 8 is arranged on the underface of described first speculum 4；Described nonlinear optical crystal 5X axle and
The angular bisector of Z axis is parallel to the polarization direction of the fundamental frequency light that fundamental frequency light source 1 produces, the optical axis side of described quarter-wave plate 6
To the polarization direction being parallel to the fundamental frequency light that fundamental frequency light source 1 produces.Described first speculum 4 with the angle of the central shaft of light path is
45°。
Described fundamental frequency light source 1 produces fundamental frequency light, and fundamental frequency light, by contracting beam system, to improve the power density of incident fundamental frequency light, enters
Penetrate fundamental frequency light through the first speculum 4, entrance nonlinear optical crystal 5, generation II class frequency multiplication in nonlinear optical crystal 5
Effect, the frequency doubled light of generation and residue fundamental frequency light, through quarter-wave plate 6, incide the second speculum 7, after being totally reflected
Returning by original optical path, second time, through quarter-wave plate 6, is again introduced into nonlinear crystal 5, by quarter-wave plate 6
Polarization turning effort, frequency doubled light interacts with the z-component of residue fundamental frequency light, I class frequency tripling, the frequency tripling of generation occurs
Ultraviolet light is reflected by the first speculum 4, more filtered 8 filters residue fundamental frequency light and frequency doubled light, exports pure Ultra-Violet Laser.
So, 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, real
Existing Ultra-Violet Laser output.
GdxY1-xCOB crystal has congruent melting characteristic, and available czochralski method carries out large scale growth, and has high optical quality.
After stoichiometric proportion dispensing, carry out batch mixing imitation frosted glass, then the polycrystal material of sintering is put into Iridium Crucible, use high temperature monocrystalline
Lifting furnace grows, and grows up to GdxY1-xCOB monocrystalline.Crystal is oriented according to optical main axis, and cuts along Y direction, throws
Light, plated film.Therefore crystalloid Y-direction seeded growth, so crystal utilization rate is high.
It is provided with Faraday polarization apparatus 11 between described fundamental frequency light source 1 and described contracting beam system；
Described contracting beam system includes the first planoconvex spotlight 2 and the second planoconvex spotlight 3 that focal length is different；
Described fundamental frequency light source 1 is neodymium glass mode-locked laser, a length of 1053nm of fundamental light wave that neodymium glass mode-locked laser sends；
Described first speculum 4 is coated with anti-deielectric-coating high thoroughly to 1053nm and 526nm laser, high to 351nm ultraviolet light；
Described second speculum 7 is coated with the deielectric-coating being all-trans 1053nm and 526nm laser；
Described nonlinear optical crystal 5 cuts Gd for Y0.13Y0.87COB, described nonlinear optical crystal 5 according to principal-axes coordinate X, Y,
Z axis orients, a size of 12nm × 16mm × 29mm, two Y-directions lead to light mirror polish and be coated with 1053nm fundamental frequency, 526nm frequency multiplication,
351nm frequency tripling anti-reflection film；Y cuts Gd0.13Y0.87COB refers to: optical direction is Y-axis, throws along vertical crystal Y-axis plane cutting
Light；
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 is as shown in Figure 5.
The actual measurement output spectrum figure of the Ultra-Violet Laser frequency conversion device described in the present embodiment is as shown in Figure 6；In Fig. 6, as 1053nm tri-times
When frequency realizes, spectrometer recording the spectrogram of exported ultraviolet light, centre wavelength is positioned at 351 nanometers, it was demonstrated that frequency tripling is able to
Realize.
Claims (8)
1. the Ultra-Violet Laser frequency conversion device having noncritical phase matching frequency multiplication, frequency tripling performance concurrently, it is characterised in that include
Fundamental frequency light source, contracting beam system, the first speculum, nonlinear optical crystal, quarter-wave plate, the second speculum and filter plate,
Described contracting beam system, the first speculum, nonlinear optical crystal, quarter-wave plate, the second speculum edge the most successively
Light path is laid, and described filter plate is arranged on the underface of described first speculum；Described nonlinear optical crystal X-axis and Z axis
Angular bisector, is 0-5 ° with the angle of the polarization direction of the fundamental frequency light of fundamental frequency light source generation, the optical axis of described quarter-wave plate
The angle of the polarization direction of the fundamental frequency light that direction produces with fundamental frequency light source is 0-5 °；Described first speculum and the central shaft of light path
Angle be 35-55 °；Described nonlinear optical crystal is GdxY1-xCOB crystal, when the fundamental frequency light wavelength that fundamental frequency light source sends
During for 1064nm, the span of x is 0.18-0.22, as a length of 1053nm of the fundamental light wave that fundamental frequency light source sends, x's
Span is 0.11-0.15.
A kind of Ultra-Violet Laser frequency conversion having noncritical phase matching frequency multiplication, frequency tripling performance concurrently the most according to claim 1
Device, it is characterised in that the angular bisector of described nonlinear optical crystal X-axis and Z axis is parallel to the fundamental frequency light that fundamental frequency light source produces
Polarization direction, the optical axis direction of described quarter-wave plate is parallel to the polarization direction of fundamental frequency light that fundamental frequency light source produces.
A kind of Ultra-Violet Laser frequency conversion having noncritical phase matching frequency multiplication, frequency tripling performance concurrently the most according to claim 1
Device, it is characterised in that described first speculum is 45 ° with the angle of the central shaft of light path.
A kind of Ultra-Violet Laser frequency conversion having noncritical phase matching frequency multiplication, frequency tripling performance concurrently the most according to claim 1
Device, it is characterised in that as a length of 1064nm of the fundamental light wave that fundamental frequency light source sends, x=0.2；When the base that fundamental frequency light source sends
Frequently during a length of 1053nm of light wave, x=0.13.
A kind of Ultra-Violet Laser frequency conversion having noncritical phase matching frequency multiplication, frequency tripling performance concurrently the most according to claim 1
Device, it is characterised in that described Ultra-Violet Laser frequency conversion device also includes that temperature-controlling system and electric rotating platform, described temperature-controlling system include
Temperature control box, described nonlinear optical crystal is arranged in described temperature control box, and described electric rotating platform is arranged under described temperature control box
Side.
A kind of Ultra-Violet Laser frequency conversion having noncritical phase matching frequency multiplication, frequency tripling performance concurrently the most according to claim 5
Device, it is characterised in that the temperature-controlled precision of described temperature-controlling system is ± 0.1 DEG C, described temperature control box two leads to light end face and is provided with ultraviolet
The high saturating quartz glass of-infrared broad spectrum；The rotation precision of described electric rotating platform is 0.00125 °.
A kind of Ultra-Violet Laser frequency conversion device having noncritical phase matching frequency multiplication, frequency tripling performance concurrently the most according to claim 1,
It is characterized in that, described contracting beam system includes different the first planoconvex spotlight of focal length and the second planoconvex spotlight；
Described fundamental frequency light source is Nd:YAG mode-locked laser；
Described first speculum is coated with anti-deielectric-coating high thoroughly to 1064nm and 532nm laser, high to 355nm ultraviolet light；
Described second speculum is coated with the deielectric-coating being all-trans 1064nm and 532nm laser；
Described nonlinear optical crystal is that Y cuts Gd0.2Y0.8COB, described nonlinear optical crystal is according to principal-axes coordinate X, Y, Z
Axle orients, and a size of 10mm × 10mm × 5mm, two Y-directions are led to light mirror polish and are coated with 1064nm, 532nm, 355nm tri-times
Frequently anti-reflection film；
Described quarter-wave plate is 532nm mica quarter-wave plate；
Described filter plate is coated with anti-, to 355nm laser high saturating deielectric-coating high to 1064nm and 532nm laser.
A kind of Ultra-Violet Laser frequency conversion device having noncritical phase matching frequency multiplication, frequency tripling performance concurrently the most according to claim 1,
It is characterized in that, between described fundamental frequency light source and described contracting beam system, be provided with Faraday polarization apparatus；
Described contracting beam system includes different the first planoconvex spotlight of focal length and the second planoconvex spotlight；
Described fundamental frequency light source is neodymium glass mode-locked laser；
Described first speculum is coated with anti-deielectric-coating high thoroughly to 1053nm and 526nm laser, high to 351nm ultraviolet light；
Described second speculum is coated with the deielectric-coating being all-trans 1053nm and 526nm laser；
Described nonlinear optical crystal is that Y cuts Gd0.13Y0.87COB, described nonlinear optical crystal is according to principal-axes coordinate X, Y, Z
Axle orients, a size of 12nm × 16mm × 29mm, two Y-directions lead to light mirror polish and be 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 coated with anti-, to 351nm laser high saturating deielectric-coating high to 1053nm and 526nm laser.
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| CN201620195012.9U CN205405031U (en) | 2016-03-14 | 2016-03-14 | Have ultraviolet laser converter of non -critical phase matching doubling of frequency, frequency tripling performance concurrently |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105549295A (en) * | 2016-03-14 | 2016-05-04 | 山东大学 | Ultraviolet laser frequency converter with noncritical phase matching frequency doubling and three-frequency doubling performance and work method of ultraviolet laser frequency converter |
| CN114164491A (en) * | 2021-11-24 | 2022-03-11 | 山东大学 | Ion-doped gadolinium-gallium garnet crystal and preparation method and application thereof |
-
2016
- 2016-03-14 CN CN201620195012.9U patent/CN205405031U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105549295A (en) * | 2016-03-14 | 2016-05-04 | 山东大学 | Ultraviolet laser frequency converter with noncritical phase matching frequency doubling and three-frequency doubling performance and work method of ultraviolet laser frequency converter |
| CN105549295B (en) * | 2016-03-14 | 2019-01-04 | 山东大学 | It is a kind of to have both noncritical phase matching frequency multiplication, the ultraviolet laser frequency conversion device of frequency tripling performance and its working method |
| CN114164491A (en) * | 2021-11-24 | 2022-03-11 | 山东大学 | Ion-doped gadolinium-gallium garnet crystal and preparation method and application thereof |
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