CN208847858U - Its laser aid of a kind of true zero level optical wave plate of large scale and application - Google Patents
Its laser aid of a kind of true zero level optical wave plate of large scale and application Download PDFInfo
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Abstract
The utility model relates to a kind of true zero level optical wave plate of large scale and using its laser aid, the type of the wave plate is half-wave plate or quarter-wave plate；When the type of the wave plate is half-wave plate, the relational expression of the corner cut α of wave plate center operating wavelength λ, o optical index no, e light principal refractive index ne, wave plate thickness d and the wave plate are as follows:When the type of the wave plate is quarter-wave plate, the relational expression of the corner cut α of wave plate center operating wavelength λ, o optical index no, e light principal refractive index ne, wave plate thickness d and the wave plate are as follows:Laser aid, including the laser, true zero level optical wave plate, II class frequency-doubling crystal, fundamental frequency optical filter successively placed along optical path.The utility model has the significant advantages such as size is big, service band is wide, temperature stability is good, processing is convenient, high yield rate, low in cost, high mechanical strength, long service life, is expected to obtain important application in multiple fields.
Description
Technical field
The utility model relates to a kind of true zero level optical wave plate of large scale and using its laser aid, belong to polarization optics
Technical field.
Background technique
Optical wave plate is also referred to as optics phase delayer, is the important optics member for the polarization state for changing light using birefringent characteristic
Part.It has in the optics related with light polarization such as photoelastic equipment, polarimeter, electric-optically Q-switched solid state laser and laser aid
Very extensive application.In general, wave plate can be divided by structure: true zero-th order waveplates, multistage wave plate and by more than two wave plates
The compound zero-th order waveplates of composition.Compared with multistage wave plate (2 π of bit phase delay >), zeroth order wave plate (2 π of phase delay <), especially
True zero-th order waveplates have many advantages, such as that wavelength sensitivity low (service band is wide), temperature stability are high, acceptance angle is big.
Now widely used wave plate focuses primarily upon a few material, and such as quartz, magnesium fluoride, mica, gathers sapphire
Close object film and liquid crystal.Wherein wave plate quality made of bulk crystals is best, but the thickness of its true zero-th order waveplates is usually 0.01
~0.1 millimeter, this makes bore extremely difficult more than the processing of the true zero level crystal wave-plate of centimetres, and frangible, yield rate is low,
It is at high cost and not high to the endurance of strong light in use process.Compared with bulk crystals, polymer and liquid crystal are easier to preparation greatly
The true zero-th order waveplates of size, but transmission region is limited (being concentrated mainly on visual field), and threshold for resisting laser damage is lower.Many big
In bore optical system (such as laser fusion facility, high resolution detection instrument and astronomical observation equipment), large scale, Gao Pin are needed
Matter, high anti-light wound wave plate be used as phase delayer or polarisation alignment element, but the more of quartz or sapphire can only be used at present
Grade wave plate or compound zero-th order waveplates, no true zero level crystal wave-plate are available.In addition, for wide spectrum high power, it is ultrafast swash
For light pulse, uniform bit phase delay also needs the true zero level crystal wave-plate of high-quality that service band is wide, anti-light injury threshold is high.
Chinese patent literature CN200956077Y discloses a kind of crystal wave-plate, is birefringece crystal, optical axis direction
It is in low-angle with light pass surface normal direction, institute's processing device is rudimentary wave plate, and feature is that have wider temperature bandwidth, application direction
For the micro-slice laser of intracavity frequency doubling.Optional corner cut range is smaller, and wavelength bandwidth is relatively narrow, and use scope is relatively narrow, application
It is few.
Summary of the invention
In view of the deficiencies of the prior art, the utility model provides a kind of true zero level KH2PO4(KDP) or NH4H2PO4(ADP) brilliant
Bulk wave piece.
Term is explained:
1, KDP crystal, KH2PO4Crystal；
2, ADP crystal, NH4H2PO4Crystal；
3, center operating wavelength λ refers to that phase delay is exactly equal to the corresponding wavelength of π for half-wave plate, for four/
One wave plate refers to that phase delay is exactly equal to the corresponding wavelength of pi/2；
4, o optical index no refers to polarization along the refractive index of the light of crystal o light main shaft；
5, e light principal refractive index ne, refer to polarization along the refractive index of the light of Kristall light main shaft；
6, wave plate thickness d refers to wave plate in the length of optical direction；
7, the corner cut α of wave plate refers to the angle of wave plate light pass surface normal direction Yu Kristall light major axes orientation；
8, wave plate is birefringent, refers to the specific refractivity of two different linear polarizations in crystal when light passes through wave plate.
The technical solution of the utility model is as follows:
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are half-wave plate or a quarter
Wave plate；
When the type of the wave plate is half-wave plate, wave plate center operating wavelength λ, o optical index no, e light principal refractive index ne、
Shown in the relational expression such as formula (I) of the corner cut α of wave plate thickness d and the wave plate:
When the type of the wave plate is quarter-wave plate, the main folding of wave plate center operating wavelength λ, o optical index no, e light
Penetrate rate ne, wave plate thickness d and the wave plate corner cut α relational expression such as formula (II) shown in:
In formula (I), formula (II), △ n refers to the birefringent of the wave plate.
It makes raw material and selects KDP or ADP crystal, this is the size that can be obtained using Artificial Growth method in the world at present
It is various types of to be conducive to extensive, inexpensive batch production for two maximum and minimum cost crystalloids, excellent combination property
The wave plate element of type, various bores.For most common half-wave plate and quarter-wave plate in polarization optics field, when in satisfaction
It states public formula (I) or true zero order phase delay may be implemented in public formula (II).
Preferred according to the utility model, which is KDP crystal or ADP crystal.KDP crystal or ADP crystal are current
Two crystalloids that the size that can be obtained using Artificial Growth method in the world is maximum and cost is minimum, comprehensive performance are excellent
It is different, be conducive to the wave plate element of extensive, inexpensive batch production various types, various bores.
Preferred according to the utility model, the forward and backward light passing surface of wave plate is plated with to the antireflective deielectric-coating of service band.With
Reduce loss.
Preferred according to the utility model, the bore of the wave plate and the ratio of thickness are less than 50:1.
Wave plate thickness is determined according to the bore of required wave plate.According to working experience, the bore of KDP, ADP optical element
It should generally control in 50:1 with the ratio of thickness hereinafter, otherwise not can guarantee processing quality and using effect.As standard, add
The wave plate thickness that the wave plate thickness of work 1cm bore at 200 μm or more, should process 10cm bore should process 50cm mouthfuls in 2mm or more
The wave plate thickness of diameter should be in 1cm or more.
A kind of laser aid, laser, the true zero level optical wave plate, II class frequency multiplication including successively placing along optical path are brilliant
Body, fundamental frequency optical filter；The type of the true zero level optical wave plate is half-wave plate.
A kind of electric-optically Q-switched device of adding pressure type, including He-Ne laser, the total reflective mirror, described true zero successively placed along optical path
Grade optical wave plate, electrooptical switching, polarizing film, laser medium, outgoing mirror, energy meter；The type of the true zero level optical wave plate is
Quarter-wave plate.
The utility model has the following beneficial effects:
1, compared with the crystal wave-plate being commonly used, the utility model is with size is big, service band is wide, temperature is steady
The significant advantages such as qualitative good, processing convenience, high yield rate, low in cost, high mechanical strength, long service life, are expected to multiple
Field obtains important application.
2, according to wave plate size selection crystal corner cut, the utility model optical axis of crystal direction and wave plate light pass surface normal direction
Angle can be any angle (including 0 ° and 90 °), institute's processing device is true zero-th order waveplates, may be selected corner cut range it is bigger,
Wavelength bandwidth is wider, and use scope is wider, can apply in the various occasions for needing heavy caliber or broadband wave plate.
Detailed description of the invention
Fig. 1 is the true zero level KDP half-wave plate design diagram of 1064nm described in the utility model embodiment 1,2,3.
Fig. 2 is the true zero level KDP quarter-wave plate design signal of 1064nm described in the utility model embodiment 4,5,6
Figure.
Fig. 3 is the true zero level ADP half-wave plate design diagram of 1064nm described in the utility model embodiment 7,8,9.
Fig. 4 is that the true zero level ADP quarter-wave plate design of 1064nm described in the utility model embodiment 10,11,12 is shown
It is intended to.
Fig. 5 is the true zero level KDP half-wave plate design diagram of 800nm described in the utility model embodiment 13,14,15.
Fig. 6 is the true zero level KDP quarter-wave plate design signal of 800nm described in the utility model embodiment 16,17,18
Figure.
Fig. 7 is the true zero level ADP half-wave plate design diagram of 800nm described in the utility model embodiment 19,20,21.
Fig. 8 is the true zero level ADP quarter-wave plate design signal of 800nm described in the utility model embodiment 22,23,24
Figure.
Fig. 9 is the detection device schematic diagram of the utility model wavelength sensitivity.
Figure 10 is the testing result schematic diagram of the utility model wavelength sensitivity.
Figure 11 is a kind of structural block diagram of laser aid of the utility model.
Figure 12 is a kind of structural block diagram of the electric-optically Q-switched device of adding pressure type of the utility model.
Specific embodiment
The utility model is further qualified with embodiment with reference to the accompanying drawings of the specification, but not limited to this.
Embodiment 1
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are half-wave plate；The wave plate
Material is KDP crystal；Bore is 1cm, and with a thickness of 200 μm, the true zero level KDP half-wave plate device of 1064nm, corner cut α is
16.00 °, as shown in Figure 1.
Embodiment 2
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are half-wave plate；The wave plate
Material is KDP crystal；Bore is 10cm, and with a thickness of 2mm, the true zero level KDP half-wave plate device of 1064nm, corner cut α is 5.00 °,
As shown in Figure 1.
Experimental provision using interference of polarization detection wave plate wavelength sensitivity is as shown in Figure 9.The polarizer and analyzer are saturating
Vibration direction is parallel to each other, KDP or ADP half-wave plate is placed on centre.The optical axis direction and the polarizer of wave plate or the saturating vibration side of analyzer
To the angle for being in 45 °.The light output intensity of entire test macro depends on the polarization state after wave plate.The variation of wavelength influences wave plate
Phase delay, then change the polarization state of output light after wave plate, further reflection is on the intensity in transmission of test macro.Light source
For tunable OPO laser (Opolette HE 355II, OPOTEK Inc.), Wavelength tunable range is 410-2400nm, is adjusted
Section step-length is 1nm, and pulsewidth 4.5ns, spectral line width is less than 7cm-1, repetition rate 20Hz, output energy is about~2mJ
(1064nm).Its beam divergence mrad, in vertical direction < 2mrad in the horizontal direction < 10.When incident light reaches beam splitter
When, it is divided into reference light and test light, energy ratio 1:4.2.The polarizer and analyzer are all Glan-Taylor prism (transmissivities
92% 900~1300nm of@).Rotating platform can be with the direction in space of fine adjustment wave plate.Data collection system is by two energy meters
It is formed with a computer.
As shown in Figure 10, by taking thickness 2mm, the true zero level KDP half-wave plate of 5.00 ° of corner cut of 1064nm in the present embodiment as an example,
Level-one wave plate and second level wave plate of its wavelength sensitivity well below identical the corner cut, (1040- in the wavelength band of 50nm wide
Stable, excellent phase-delay characteristic 1090nm) is shown, extinction ratio (inverse of transmitance) is greater than 100:1.To being tested in figure
Data carry out theoretical fitting, and the wavelength sensitivity of available true zero-th order waveplates is -4.92mrad/nm, and firsts and seconds wave
The wavelength sensitivity of piece is respectively -14.82mrad/nm, -24.77mrad/nm.Independent point is experimental data in Figure 10, continuously
Curve is theoretical fitting result.
Embodiment 3
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are half-wave plate；The wave plate
Material is KDP crystal；Bore is 50cm, and with a thickness of 1cm, the true zero level KDP half-wave plate device of 1064nm, corner cut α is 2.23 °,
As shown in Figure 1.
Embodiment 4
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are quarter-wave plate；It should
The material of wave plate is KDP crystal；Bore is 1cm, is the true zero level KDP quarter-wave plate device of 1064nm with a thickness of 200 μm,
Its corner cut α is 11.23 °, as shown in Figure 2.
Embodiment 5
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are quarter-wave plate；It should
The material of wave plate is KDP crystal；Bore is 10cm, is the true zero level KDP quarter-wave plate device of 1064nm with a thickness of 2mm,
Its corner cut α is 3.53 °, as shown in Figure 2.
Embodiment 6
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are quarter-wave plate；It should
The material of wave plate is KDP crystal；Bore is 50cm, is the true zero level KDP quarter-wave plate device of 1064nm with a thickness of 1cm,
Its corner cut α is 1.57 °, as shown in Figure 2.
Embodiment 7
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are half-wave plate；The wave plate
Material is ADP crystal；Bore is 1cm, is the true zero level ADP half-wave plate device of 1064nm with a thickness of 200 μm, corner cut α is
15.00 °, as shown in Fig. 3.
Embodiment 8
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are half-wave plate；The wave plate
Material is ADP crystal；Bore is 10cm, is the true zero level ADP half-wave plate device of 1064nm with a thickness of 2mm, corner cut α is
4.70 °, as shown in Figure 3.
Embodiment 9
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are half-wave plate；The wave plate
Material is ADP crystal；Bore is 50cm, is the true zero level ADP half-wave plate device of 1064nm with a thickness of 1cm, corner cut α is
2.10 °, as shown in Figure 3.
Embodiment 10
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are quarter-wave plate；It should
The material of wave plate is ADP crystal；Bore is 1cm, is the true zero level ADP quarter-wave plate device of 1064nm with a thickness of 200 μm,
Its corner cut α is 10.54 °, as shown in Figure 4.
Embodiment 11
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are quarter-wave plate；It should
The material of wave plate is ADP crystal；Bore is 10cm, is the true zero level ADP quarter-wave plate device of 1064nm with a thickness of 2mm,
Its corner cut α is 3.31 °, as shown in Figure 4.
Embodiment 12
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are quarter-wave plate；It should
The material of wave plate is ADP crystal；Bore is 50cm, is the true zero level ADP quarter-wave plate device of 1064nm with a thickness of 1cm,
Corner cut α is 1.48 °, as shown in Figure 4.
Embodiment 13
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are half-wave plate；The wave plate
Material is KDP crystal；Bore is 1cm, is the true zero level KDP half-wave plate device of 800nm with a thickness of 200 μm, corner cut α is
13.00 °, as shown in Fig. 5.
Embodiment 14
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are half-wave plate；The wave plate
Material is KDP crystal；Bore is 10cm, is the true zero level KDP half-wave plate device of 800nm with a thickness of 2mm, corner cut α is
4.07 °, as shown in Figure 5.
Embodiment 15
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are half-wave plate；The wave plate
Material is KDP crystal；Bore is 50cm, is the true zero level KDP half-wave plate device of 800nm with a thickness of 1cm, corner cut α is
1.82 °, as shown in Figure 5.
Embodiment 16
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are quarter-wave plate；It should
The material of wave plate is KDP crystal；Bore is 1cm, is the true zero level KDP quarter-wave plate device of 800nm with a thickness of 200 μm,
Its corner cut α is 9.14 °, as shown in Figure 6.
Embodiment 17
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are quarter-wave plate；It should
The material of wave plate is KDP crystal；Bore is 10cm, is the true zero level KDP quarter-wave plate device of 800nm with a thickness of 2mm,
Corner cut α is 2.88 °, as shown in Figure 6.
Embodiment 18
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are quarter-wave plate；It should
The material of wave plate is KDP crystal；Bore is 50cm, is the true zero level KDP quarter-wave plate device of 800nm with a thickness of 1cm,
Corner cut α is 1.29 °, as shown in Figure 6.
Embodiment 19
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are half-wave plate；The wave plate
Material is ADP crystal；Bore is 1cm, is the true zero level ADP half-wave plate device of 800nm with a thickness of 200 μm, corner cut α is
12.30 °, as shown in Fig. 7.
Embodiment 20
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are half-wave plate；The wave plate
Material is ADP crystal；Bore is 10cm, is the true zero level ADP half-wave plate device of 800nm with a thickness of 2mm, corner cut α is
3.86 °, as shown in Figure 7.
Embodiment 21
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are half-wave plate；The wave plate
Material is ADP crystal；Bore is 50cm, is the true zero level ADP half-wave plate device of 800nm with a thickness of 1cm, corner cut α is
1.72 °, as shown in Figure 7.
Embodiment 22
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are quarter-wave plate；It should
The material of wave plate is ADP crystal；Bore is 1cm, is the true zero level ADP quarter-wave plate device of 800nm with a thickness of 200 μm,
Its corner cut α is 8.66 °, as shown in Figure 8.
Embodiment 23
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are quarter-wave plate；It should
The material of wave plate is ADP crystal；Bore is 10cm, is the true zero level ADP quarter-wave plate device of 800nm with a thickness of 2mm,
Corner cut α is 2.73 °, as shown in Figure 8.
Embodiment 24
A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, the type of the wave plate are quarter-wave plate；It should
The material of wave plate is ADP crystal；Bore is 50cm, is the true zero level ADP quarter-wave plate device of 800nm with a thickness of 1cm,
Corner cut α is 1.22 °, as shown in Figure 8.
The preparation method of the true zero level optical wave plate of large scale of any low wavelength sensitivity of embodiment 1-24, including step
It is rapid as follows:
(1) KDP crystal or ADP crystal are selected；
(2) determine that wave plate thickness, the bore of wave plate and the ratio of thickness are less than 50:1 according to the bore of required wave plate；
(3) corner cut of true zero-th order waveplates is determined according to the thickness of required wave plate and type；For single shaft crystalline substance KDP, ADP
Speech, when the direction of propagation of light is along o axis (i.e. x or y-axis), birefringent maximum is no-ne, and corresponding true zero-th order waveplates are most thin；When
When the direction of propagation of light is along e axis (i.e. z-axis), birefringent minimum, theoretically 0, corresponding true zero-th order waveplates are most thick；When the biography of light
Direction is broadcast from no main shaft to when the variation of ne main shaft, birefringent to be gradually reduced, corresponding true zero-th order waveplates gradually thicken.Set light
The direction of propagation be any direction of propagation, when the direction of propagation and the KDP crystal or ADP Kristall axis direction are (i.e. usually said
KDP or ADP crystal Z axis direction) angle is corresponding birefringent as shown in formula (III) when being α:
△ n=no-n'e(α) (III)
In formula (III),Ne ' (α) refers to the e optical index on the direction α；
For most common half-wave plate in polarization optics field, condition such as formula (IV) institute of true zero order phase delay is realized
Show:
For most common quarter-wave plate in polarization optics field, the condition such as formula of true zero order phase delay is realized
(V) shown in:
When the type of the wave plate is half-wave plate, the corner cut α of true zero-th order waveplates is sought according to the formula (I)；The class of the wave plate
When type is quarter-wave plate, the corner cut α of true zero-th order waveplates is sought according to the formula (II)；
(4) KDP crystal or ADP crystal are cut along the direction corner cut α with thickness d, i.e. wave plate light passing normal to a surface
Direction is along the direction α.It comprises the following steps that
A, orientation is cut to the face z of KDP crystal or ADP crystal, calibrated repeatedly, it is ensured that the face z cutting accuracy, i.e. pitch orientation
Angle with left rotation and right rotation direction is less than 2 '；
B, Cutting platform is rotated into angle [alpha], the brilliant base that cuts down is oriented, it is ensured that the accuracy of cutting angle, then to cutting
Platform parallel movement d+d ', d ' is cut as the sum of the thickness and subsequent polishing surplus of cutting line or cutter；
C, two-sided orientation, thickness measure are carried out to the brilliant base of cutting, marks cutting error, provided for subsequent refine, polishing
With reference to.Wave plate optical axis direction is parallel to rib at this time.
(5) shaping, polishing to get.
Embodiment 25
The application of the true zero level optical wave plate of the large scale of above-mentioned low wavelength sensitivity, the linear polarization of commercial lasers always edge
Vertically or horizontally.In numerous applications, it needs the wavelength of laser carrying out frequency multiplication.For II class frequency multiplication, there are two types of methods
It can satisfy phase-matching condition, one is frequency-doubling crystal is rotated 45 ° around wave vector direction, this method, which seems, not to be introduced newly
Optical element, cost is relatively low, but the adjustment of frequency-doubling crystal is very inconvenient, and the linear polarization for exporting frequency doubled light be inclination
45 °, this brings new problem to subsequent use.
Another kind is half-wave plate to be added fundamental frequency polarization of light is rotated 45 ° around wave vector direction, as shown in figure 11, a kind of laser
Device, including the laser, true zero-order half-wave piece, II class frequency-doubling crystal, fundamental frequency optical filter successively placed along optical path；
Laser output light, that is, fundamental frequency light linear polarization is along vertically or horizontally, the optical axis projection side of II class frequency-doubling crystal
It is overlapped to fundamental frequency light polarization direction, the optical axis projecting direction of true zero-order half-wave piece and the angle of fundamental frequency light polarization direction are
22.5 °, its 45 ° of polarization rotation, meets the phase of II class frequency-doubling crystal when fundamental frequency light passes through the true zero-order half-wave piece
Matching condition, so that the linear polarization of output frequency doubled light is along vertically or horizontally.Convenient for subsequent use.Fundamental frequency optical filter is for filtering
Except the remaining fundamental frequency light after II class frequency multiplication.In this way, may be implemented by introducing true zero level quarter-wave plate described herein
The efficient II class frequency multiplication of broadband laser, adjustment are more more convenient than rotation frequency-doubling crystal, and do not influence beam size, subsequent to make
With conveniently.
This method adjustment flexibly, does not influence beam size, the linear polarization for exporting frequency doubled light is vertically or horizontally, convenient for answering
With particularly suitable heavy caliber, high power laser system.Figure 11 can be seen that the linear polarization of output frequency doubled light still along the vertical direction.
Compared with other wave plates, the sharpest edges using true zero level KDP half-wave plate are that service band is wide, and identity unit can
It can be used for Nd:YAG (1064nm), Yb:YAG (1030-1060nm), Nd:YLF for a variety of laser mediums, such as 1064nm device
Lasers, the 800nm device such as (1047,1053nm), Yb:YLF (1030-1050nm), Nd:glass (1053nm) can be used for width
In addition the ultrafast ti sapphire laser of spectrum also has many advantages, such as that temperature stability is good, firm reliable, anti-light wound is high.
Embodiment 26
The application of the true zero level optical wave plate of the large scale of above-mentioned low wavelength sensitivity, electric-optically Q-switched is to obtain intensity laser
The important technology of pulse.Wherein adding pressure type is electric-optically Q-switched is conducive to short pulse, the output of high-peak power laser.This working method
Quarter-wave plate is needed, for adjusting low Q state (" shutdown " state) when voltage is not added in Q-switch.Carry out adding pressure type electric light
Adjust Q, as shown in figure 12, a kind of electric-optically Q-switched device of adding pressure type, including the He-Ne laser, total reflective mirror, institute successively placed along optical path
State true zero level quarter-wave plate, electrooptical switching, polarizing film, laser medium, outgoing mirror, energy meter；
The length of recessed flat laser resonator is about 1 meter.Left end concave mirror is laser total reflective mirror, and radius of curvature is 3 meters.Right end
Plane mirror is laser coupled outgoing mirror, transmissivity 20%.Using He-Ne laser as collimated light source.Laser medium by
Xenon flash lamp pumping, working frequency 1Hz.Polarizing film is placed with Brewster's angle, to select the linear polarization of output laser.Electricity
Light Q-switch is by La3Ga5SiO14(Langasite, LGS) crystal is made.True zero level KDP quarter-wave plate with a thickness of 2mm,
Corner cut α is 3.53 °.When xenon lamp voltage is 900V, the Static output energy of 220mJ can be obtained.It is depressed in identical lamp, dynamic
Output energy is 140mJ, the output ratio of Q-switching to free running 64%.Corresponding single pulse width is 25ns.
When the endovenous laser that polarizing film is selected is propagated twice to the left and to the right, apply the electrooptical switching of no-voltage not
Increase phase delay, the true zero level quarter-wave plate increases π phase delay, and linear polarization deflects 90 °, and laser is hindered by polarizing film
Gear, can not form output, high loss (low Q) state corresponding to the resonant cavity；When the electrooptical switching applies quarter-wave
When voltage, the laser to pass twice through back and forth introduces π phase delay, in addition the π phase of the true zero level quarter-wave plate
Delay, total phase delay are 2 π, and polarization state is constant, by polarizing film, are constantly amplified, and pulse laser output is formed, and corresponding to should
Low-loss (high Q) state of resonant cavity.In this way, by introducing true zero level quarter-wave plate described herein, it can be in width
The electric-optically Q-switched operating of adding pressure type of laser is realized in wave band.
Compared with other wave plates, the sharpest edges using true zero level KDP quarter-wave plate are that service band is wide, identical
Device can be used for a variety of laser mediums, as 1064nm device can be used for Nd:YAG (1064nm), Yb:YAG (1030-1060nm),
The laser materials such as Nd:YLF (1047,1053nm), Yb:YLF (1030-1050nm), Nd:glass (1053nm), in addition also have
Have the advantages that temperature stability is good, firm reliable, anti-light wound is high.
Claims (9)
1. a kind of true zero level optical wave plate of the large scale of low wavelength sensitivity, which is characterized in that the type of the wave plate is half-wave plate
Or quarter-wave plate；
When the type of the wave plate is half-wave plate, wave plate center operating wavelength λ, o optical index no, e light principal refractive index ne, wave plate
Shown in the relational expression such as formula (I) of the corner cut α of thickness d and the wave plate:
When the type of the wave plate is quarter-wave plate, wave plate center operating wavelength λ, o optical index no, e light principal refractive index
ne, wave plate thickness d and the wave plate corner cut α relational expression such as formula (II) shown in:
In formula (I), formula (II), △ n refers to the birefringent of the wave plate.
2. a kind of true zero level optical wave plate of large scale of low wavelength sensitivity according to claim 1, which is characterized in that should
Wave plate is KDP crystal or ADP crystal.
3. a kind of true zero level optical wave plate of large scale of low wavelength sensitivity according to claim 1, which is characterized in that wave
The forward and backward light passing surface of piece is plated with to the antireflective deielectric-coating of service band.
4. a kind of true zero level optical wave plate of large scale of low wavelength sensitivity according to claim 1, which is characterized in that should
The bore of wave plate and the ratio of thickness are less than 50:1.
5. a kind of laser aid, which is characterized in that laser, claim 1-4 including successively placing along optical path are any described
True zero level optical wave plate, II class frequency-doubling crystal, fundamental frequency optical filter；The type of the true zero level optical wave plate is half-wave plate.
6. a kind of electric-optically Q-switched device of adding pressure type, which is characterized in that including successively placed along optical path He-Ne laser, total reflective mirror,
Any true zero level optical wave plate of claim 1-4, electrooptical switching, polarizing film, laser medium, outgoing mirror, energy meter；It is described
The type of true zero level optical wave plate is quarter-wave plate.
7. the electric-optically Q-switched device of a kind of adding pressure type according to claim 6, which is characterized in that the curvature of the total reflective mirror half
Diameter is 3m.
8. the electric-optically Q-switched device of a kind of adding pressure type according to claim 6, which is characterized in that the transmissivity of the outgoing mirror
It is 20%.
9. according to a kind of electric-optically Q-switched device of adding pressure type as claimed in claim 6 to 8, which is characterized in that the laser medium
For xenon flash lamp pumping, the working frequency of xenon flash lamp pumping is 1Hz.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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2018
- 2018-08-17 CN CN201821327360.2U patent/CN208847858U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108761622B (en) * | 2018-08-17 | 2024-01-23 | 山东大学 | Large-size true zero-order optical wave plate with low wavelength sensitivity and preparation method and application thereof |
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