CN107104355A - A kind of laser and its method of work based on monolithic KDP Cascaded crystals optical frequency variables - Google Patents
A kind of laser and its method of work based on monolithic KDP Cascaded crystals optical frequency variables Download PDFInfo
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- CN107104355A CN107104355A CN201710472844.XA CN201710472844A CN107104355A CN 107104355 A CN107104355 A CN 107104355A CN 201710472844 A CN201710472844 A CN 201710472844A CN 107104355 A CN107104355 A CN 107104355A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
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Abstract
The present invention relates to a kind of laser based on monolithic KDP Cascaded crystals optical frequency variables and its method of work, including the tangential KDP crystal of the pumping source laid successively along light path, diaphragm, attenuation factor, frequency multiplication, the first colour filter, the second colour filter；The tangential KDP crystal of monolithic frequency multiplication of the present invention realizes the cascade optical frequency variable of frequency multiplication and stimulated Raman scattering, it is convenient to Nd:YAG (1064nm) or Nd:Glass (1053nm) pulse laser carries out optical frequency variable, and the output of green glow, yellow orange light and feux rouges can be realized by the different spectrum colour filters that pass through of application.Both it can be used as green, yellow, red trichromatism laser signal light, and also can be applied to the fields such as laser medicine field, spectroscopy, military affairs, meteorological field as yellow light sources.The invention has that simple for structure, stability is strong, cost is relatively low, is widely used, it is simple to operate, practical the features such as.
Description
Technical field
The present invention relates to a kind of laser based on monolithic KDP Cascaded crystals optical frequency variables and its method of work, belong to sharp
Light technical field.
Background technology
Now, laser is widely used in all trades and professions, and the life with people is closely bound up.But the wavelength of laser is limited, obtains
The most frequently used technology path for obtaining new wavelength is to neodymium-doped yttrium-aluminum garnet (Nd:) or nd glass laser (Nd YAG:Glass) etc.
Ripe laser carries out the optical frequency variable such as frequency multiplication and frequency, difference frequency, stimulated Raman scattering.Wherein, frequency multiplication is combined with excited Raman,
Gold-tinted, orange light, feux rouges in visible ray etc. can be obtained.The laser of yellow orange wave band is in laser medicine field, spectroscopy, military affairs, gas
As the multiple fields such as field, information storage have important application.In recent years, people are directed to the production of yellow orange wave band of laser always
It is raw.At present, the implementation of all-solid-state yellow laser mainly has three kinds：
(1) gold-tinted is obtained by infrared laser frequency multiplication.This method passes through the laser crystal of pumping broadband emission, such as Cr:
Mg2SiO4、LiF:F2, near-infrared basic frequency laser is obtained, then frequency multiplication conversion is carried out using frequency-doubling crystals such as ktp crystal and LBO,
Obtain gold-tinted output.Such as S.M.Gimn et al., Applied optics 41 (21), 4331 (2002), the method it is prominent
It is to need complicated tuning process to realize to go wrong, and laser cavity structure is complicated.
(2) non-linear and frequency realizes that gold-tinted is exported.Two wavelength operated simultaneously using existing outside intracavitary or chamber simultaneously
Light, two wavelength carry out the acquisition of non-linear and frequency effect and frequency light in non-linear and frequency crystal.Correlation technique is referring to Chinese patent
Document CN103259183A authorize patent of invention, make 1064nm and 1319nm laser with frequency crystal in pass through and frequency, realize
589nm gold-tinteds laser is exported.Nothing is outside chamber or intracavitary and the mode of frequency, is related to the laser cavity structure of complexity, it is necessary to which two pieces are swashed
Luminescent crystal and frequency-doubling crystal are realized and frequency process.Have that volume is big, conversion efficiency is poor, stability is poor, be difficult to the method for frequency
The shortcomings of realizing.
(3) excited Raman carries out frequency conversion to fundamental frequency light with frequency multiplication and realizes that gold-tinted is exported.This method is divided into the outer light of chamber
Learn frequency conversion and two kinds of forms of tracavity optical frequency conversion.No matter the mode of the outer frequency conversion of chamber first carries out Raman frequency shift frequency multiplication again to fundamental frequency light,
Or first frequency multiplication carries out Raman frequency shift again, is required for two pieces of crystal of Raman crystal and frequency-doubling crystal, such as R.P.Mildren et
Al., Optics express 12 (5), 785 (2004), using KGd (WO4)2Crystal carries out Raman conversion, for different pumps
The a plurality of spectral line that Pu polarization direction obtains gold-tinted to yellow orange light respectively is exported.Tracavity optical frequency conversion need gain medium,
Raman crystal, frequency-doubling crystal, Q-modulating device or from raman laser gain media, frequency-doubling crystal, Q-modulating device, and design suitable
Laser cavity structure and complicated plated film mode.Domestic correlation technique such as Chinese patent literature CN101308994A mandate invention
Patent, Patent design folding cavity self-raman frequency doubling completely solid yellow laser.The peak power for being limited to fundamental frequency light is low, turns
Change inefficient, hardly possible obtains high-power gold-tinted output.
Simple in construction, cost is low, few using kind of crystalline, has gold-tinted concurrently and is exported with other visible wavelengths, and applies
Extensive laser has important application value and scientific research value.
The content of the invention
In order to overcome the defect and deficiency that prior art is present, monolithic KDP Cascaded crystals are based on the invention provides one kind
The laser of optical frequency variable.
Present invention also offers the method for work of above-mentioned laser.
Term is explained：
KDP crystal, potassium dihydrogen phosphate crystal.
The technical scheme is that：
A kind of laser based on monolithic KDP Cascaded crystals optical frequency variables, including pumping source, the light laid successively along light path
The tangential KDP crystal of door screen, attenuation factor, frequency multiplication, the first colour filter, the second colour filter；
The pumping source produces laser, and incides in the KDP crystal, and fundamental frequency light is converted into again by the KDP crystal
Frequency light, while frequency doubled light produces stimulated Raman scattering in the KDP crystal, obtains the stimulated Raman scattering laser of frequency doubled light,
The optical frequency variable that frequency multiplication is cascaded with stimulated Raman scattering is realized in the KDP crystal.
KDP crystal is grown using aqua-solution method, and growing technology is ripe, and is easy to grow into large size single crystal, Raman frequency shift
For 910 ± 10cm-1.The techniques such as related orientation, cutting, polishing, plated film are also all more ripe, are easy to mass production.
According to currently preferred, the cutting angle of the I type-Ⅱphase matchings of the KDP crystal is (θ, φ), θ span
For 40 ° -42 °, φ span is 44 ° -46 °；
The cutting angle of the II type-Ⅱphase matchings of the KDP crystal is (θ 1, φ 1), θ 1 span for 58 ° -60 °, φ
1 span is 0 ° -1 °；
It is further preferred that θ=41 °, φ=45 °；θ 1=59 °, φ 1=0 °.
According to currently preferred, the preceding surface of the KDP crystal is plated with to the high frequency multiplication thoroughly, to needing to produce of fundamental frequency light
The high anti-deielectric-coating of the stimulated Raman scattering laser of light and frequency doubled light, the rear surface of the KDP crystal be plated with it is high to fundamental frequency light it is anti-,
The high saturating deielectric-coating of stimulated Raman scattering laser of the frequency doubled light passed through to the frequency doubled light part for needing to produce, needs produced.
The preceding surface of the KDP crystal is the incident KDP planes of crystal of fundamental frequency pump light；The rear surface of the KDP crystal is institute
State the surface that KDP crystal produces the stimulated Raman scattering laser of frequency doubled light and frequency doubled light.
According to currently preferred, the laser also includes lens, and the lens are arranged on the decay along light path and are
Between system and the KDP crystal, the lens are biconvex lens or planoconvex spotlight.To the work(for the fundamental frequency light for improving entrance crystal
Rate density.
According to currently preferred, the laser also includes shrink beam system, and the shrink beam system is arranged on institute along light path
State between attenuation factor and the KDP crystal.To the power density for the fundamental frequency light for improving entrance crystal.
According to currently preferred, the laser also includes input mirror, outgoing mirror, and the input mirror is arranged on along light path
Between the shrink beam system and the KDP crystal；The outgoing mirror is arranged on the KDP crystal and first colour filter along light path
Between piece.
According to currently preferred, the input mirror is plated with frequency doubled light and frequency multiplication thoroughly, to needing to produce high to fundamental frequency light
The high anti-deielectric-coating of the stimulated Raman scattering laser of light；The outgoing mirror is plated with anti-, to needing to produce frequency multiplication high to fundamental frequency light
Light part is passed through, to the high saturating deielectric-coating of stimulated Raman scattering laser of frequency doubled light.Fundamental frequency pump light is after outgoing mirror reflects
The output of frequency doubled light is realized again, and frequency doubled light realizes the defeated of excited Raman optical frequency variable again after outgoing mirror part is reflected
Go out.
According to currently preferred, the pumping source is Nd:YAG laser or Nd:Glass lasers；
The diaphragm is the baffle plate with light hole；
The attenuation factor is any of polarizer, devating prism, neutral-density filter or appoints several combinations
Structure；
First colour filter is plated with anti-, to needing generation frequency doubled light high to fundamental frequency light and the excited Raman of frequency doubled light dissipates
Penetrate the high saturating deielectric-coating of laser；
Second colour filter is plated with high anti-, frequency doubled light that is being produced to needs the excited Raman of frequency doubled light to needing to produce
The high saturating deielectric-coating of scattering laser.
The method of work of above-mentioned laser, including step are as follows：
(1) pumping source produces fundamental frequency pump light, and suitable hot spot bore is chosen by diaphragm, by attenuation factor control into
It is mapped to the energy of the fundamental frequency pump light of KDP crystal；
(2) fundamental frequency pump light is incident in the tangential KDP crystal of frequency multiplication and produces frequency doubled light, by adjusting attenuation factor, by
The energy of cumulative plus fundamental frequency pump light, the energy of frequency doubled light also accordingly increases；
(3) when frequency multiplication light energy reaches stimulated Raman scattering threshold value, single order stokes light is produced；By adjusting decay system
System continues to increase the energy of fundamental frequency pump light, is sequentially generated second order stokes light and three rank stokes light；
(4) first colour filters filter out fundamental frequency pump light, through remaining frequency doubled light and stimulated Raman scattering laser；
(5) second colour filters select the eyeglass of different plated films as needed, frequency doubled light are filtered out, through required excited Raman
Scattering laser, for application.
Beneficial effects of the present invention are：
1. output wavelength is more, it is widely used.The multistage stokes light of the achievable frequency doubled light of the present invention and frequency doubled light is defeated
Go out, can realize that one or more wavelength are exported by changing colour filter.For example, the laser by the use of 1064nm wavelength is used as pumping source
It can obtain the laser of 532nm, 558.9nm, 588.9nm, 622.1nm equiwavelength.558.9nm and 588.9nm gold-tinted laser exists
The multiple fields such as laser medicine field, spectroscopy, military affairs, meteorology, information storage have important application.By 532nm green glow,
588.9nm yellow orange light, 622.1nm feux rouges is combined can be as green, yellow, red trichromatism laser signal light.
2. simple for structure, stability is strong.The present invention realizes the light of frequency multiplication excited Raman cascade simultaneously in one piece of crystal
Frequency conversion is learned, it is compared with other intracavitary yellow orange light output technologies, simple in construction, it is to avoid the shakiness that resonator is brought with Film Design
It is qualitative, improve the stability of laser output.The invention is easy to and existing ripe Nd:YAG or Nd:Glass pulse lasers
Device is implemented in combination with the optical frequency variable of frequency multiplication excited Raman cascade.
3. pulse width is narrow, cost is relatively low.The present invention, using pulse laser as pumping source, can be nanosecond laser, psec
Laser, can directly obtain corresponding nanosecond pulse, picopulse.KDP crystal techniques are ripe, it is easy to growing large-size list
Crystalline substance, is of relatively low cost.
Brief description of the drawings
Fig. 1 is the structural representation of laser described in the embodiment of the present invention 1.
Fig. 2 is the stimulated Raman scattering laser of the frequency doubled light of laser generation and frequency doubled light described in the embodiment of the present invention 1
Spectrum schematic diagram.
The hot spot figure that Fig. 3 produces for laser described in the embodiment of the present invention 1.
Fig. 4 is the stimulated Raman scattering laser of the frequency doubled light of laser generation and frequency doubled light described in the embodiment of the present invention 2
Spectrum schematic diagram.
The hot spot figure that Fig. 5 produces for laser described in the embodiment of the present invention 2.
Fig. 6 is the structural representation of laser described in the embodiment of the present invention 3.
Fig. 7 is the structural representation of laser described in the embodiment of the present invention 4.
1st, pumping source, 2, diaphragm, 3, attenuation factor, 4, lens, 5, KDP crystal, the 6, first colour filter, the 7, second colour filter
Piece, 8, shrink beam system, 9, input mirror, 10, outgoing mirror.
Embodiment
The present invention is further qualified with reference to Figure of description and embodiment, but not limited to this.
Embodiment 1
A kind of laser based on monolithic KDP Cascaded crystals optical frequency variables, as shown in figure 1, including being laid successively along light path
Pumping source 1, the tangential KDP crystal 5 of diaphragm 2, attenuation factor 3, lens 4, frequency multiplication, the first colour filter 6, the second colour filter 7；
Pumping source 1 produces laser, and incides in KDP crystal 5, and fundamental frequency light is converted into frequency doubled light by KDP crystal 5, simultaneously
Frequency doubled light produces stimulated Raman scattering in KDP crystal 5, obtains the stimulated Raman scattering laser of frequency doubled light, real in KDP crystal 5
The optical frequency variable that frequency multiplication is cascaded with stimulated Raman scattering is showed.
KDP crystal 5 is grown using aqua-solution method, and growing technology is ripe, and is easy to grow into large size single crystal, Raman frequency shift
For 910 ± 10cm-1.The techniques such as related orientation, cutting, polishing, plated film are also all more ripe, are easy to mass production.
The cutting angle of the I type-Ⅱphase matchings of KDP crystal 5 is (θ, φ), and θ=41 °, φ=45 °, printing opacity mirror polish is not plated
Film, length is 32mm.
Pumping source 1 is the PY61 types Nd that Continuum companies produce:YAG mode-locked lasers, output wavelength 1064nm, arteries and veins
Rush width 40ps, repetition rate 10Hz laser.
Diaphragm 2 is the plate washer of the circular light hole with a diameter of 5mm.
Lens 4 are the lens that focal length is 300mm.
Attenuation factor 3 is the combining structure of two devating prisms, the power to adjust fundamental frequency pumping laser.
First colour filter 6 is plated with being excited for frequency doubled light and frequency doubled light instead, to needing generation high to fundamental frequency light (1064nm)
The high saturating deielectric-coating of Raman scattering laser (500-700nm)；
Second colour filter 7 is plated with being excited for frequency doubled light of frequency doubled light (532nm) height produced to needs instead, to needing generation
The high saturating deielectric-coating of Raman scattering laser (550-700nm).
Embodiment 2
A kind of laser based on monolithic KDP Cascaded crystals optical frequency variables according to embodiment 1, its difference is, KDP
The cutting angle of the II type-Ⅱphase matchings of crystal 5 is (θ 1, φ 1), θ 1=59 °, φ 1=0 °, the non-plated film of printing opacity mirror polish, and length is
32mm。
Embodiment 3
A kind of laser based on monolithic KDP Cascaded crystals optical frequency variables according to embodiment 1, as shown in fig. 6, its area
It is not, lens 4 is substituted for shrink beam system 8.
Lens 4 are replaced with shrink beam system 8 in the present embodiment, it is brilliant in KDP to improve the energy density for inciding KDP crystal 5
The cascade frequency conversion of frequency multiplication stimulated Raman scattering is realized in body 5.
The present embodiment makes to keep beam diameter constant in transmission of the fundamental frequency pump light in crystal, for lens 4,
Energy density of the fundamental frequency pump light in crystal transmitting procedure is improved, frequency multiplication excited Raman can also be realized in KDP crystal 5
The cascade frequency conversion of scattering.
Embodiment 4
A kind of laser based on monolithic KDP Cascaded crystals optical frequency variables according to embodiment 3, as shown in fig. 7, its area
It is not, the laser also includes input mirror 9, outgoing mirror 10, input mirror 9 is arranged on shrink beam system 8 and KDP crystal along light path
Between 5；Outgoing mirror 10 is arranged between the colour filter 6 of KDP crystal 5 and first along light path.
Input mirror 9 is plated with deielectric-coating thoroughly, anti-to laser height in 500nm-700nm wave-length coverages high to 1064nm laser.
Outgoing mirror 10 be plated with it is high anti-to 1064nm laser, 532nm laser parts are passed through, to 550nm-700nm wavelength models
Enclose the high saturating deielectric-coating of interior laser.
In the present embodiment, fundamental frequency pump light 1064nm laser realizes frequency doubled light again after the reflection of outgoing mirror 10
The output of (532nm), 532nm laser realizes the output of excited Raman optical frequency variable again after the part of outgoing mirror 10 is reflected,
More than the 10% of the former transformation efficiency of laser can be improved.
Embodiment 5
A kind of method of work of the laser based on monolithic KDP Cascaded crystals optical frequency variables described in embodiment 1, including step
It is as follows：
(1) pumping source 1 produces the fundamental frequency pump light that wavelength is 1064nm, and a diameter of 5mm light beam is chosen by diaphragm 2,
Light beam is focused on after attenuation factor 3 by lens 4, and KDP crystal 5 is placed on after focus at 4cm, and fundamental frequency pump light is incident
Into the KDP crystal 5 of I type-Ⅱphase matchings；
(2) fundamental frequency pump light produces frequency doubled light in the KDP crystal 5 of I type-Ⅱphase matchings, by adjusting attenuation factor 3, by
The energy of cumulative plus fundamental frequency pump light, frequency multiplication light energy also accordingly increases；
(3) when fundamental frequency pump light optical power density reaches 57.1GWcm2When, produce single order stokes light, i.e. 558.9nm ripples
Long laser；Adjusted by attenuation factor 3 and continue to increase the energy of fundamental frequency pump light, occur second order stokes light successively
(588.9nm) and three rank stokes light (622.1nm)；
(4) first colour filters 6 filter out fundamental frequency pump light, through remaining frequency doubled light and stimulated Raman scattering laser；
(5) second colour filters 7 filter out frequency doubled light, swash through single order, second order, three rank stokes light stimulated Raman scatterings
Light, for application.
Frequency doubled light and spectrum schematic diagram such as Fig. 2 of the stimulated Raman scattering laser of frequency doubled light that the present embodiment laser is produced
It is shown.In Fig. 2, abscissa is wavelength, and unit is nanometer；Ordinate is the peak strength of the wavelength of spectrometer measurement, and unit is
Self-defined unit.The pump light for the 1064nm for being produced pumping source 1 using lens 4 is focused on, the tangential KDP crystal 5 of I class frequencys multiplication
It is placed on behind focus, the cascade optical frequency variable of frequency multiplication and stimulated Raman scattering, exportable frequency multiplication can be realized in KDP crystal 5
Light 532.18nm, and the increase fundamental frequency pump energy of attenuation factor 3 is adjusted, as energy rise can occur frequency doubled light successively
Three rank stokes light (622.10nm) of single order stokes light (558.91nm), (588.90nm) of frequency doubled light and frequency doubled light.
Single order, second order, the threshold value of the fundamental frequency pump light optical power density of three rank stokes light are respectively 57.1GW/cm2、73.3GW/cm2、
80.7GW/cm2.Fundamental frequency pump energy can be controlled by adjusting attenuation factor 3, realize single order stokes light, second order stokes
Light, three rank stokes light outputs.The hot spot figure that Fig. 3 produces for laser described in the embodiment of the present invention 1.From inside to outside, it is successively
The single order stokes light (558.91nm) of yellow green, orange-yellow second order stokes light (588.90nm), and three red ranks
Stokes light (622.10nm).
558.9nm and 588.9nm gold-tinted laser is in laser medicine field, spectroscopy, military affairs, meteorology, information storage etc.
Multiple fields have important application.Using 532nm green glow, 588.9nm yellow orange light, 622.1nm feux rouges, be combined can be as
Green, yellow, red trichromatism laser signal light.
Embodiment 6
A kind of method of work of the laser based on monolithic KDP Cascaded crystals optical frequency variables described in embodiment 2, including step
It is as follows：
(1) wavelength that pumping source 1 is produced is 1064nm fundamental frequency pump light, and a diameter of 5mm light is chosen by diaphragm 2
Beam, light beam is focused on after attenuation factor 3 by lens 4, and the KDP crystal 5 of II type-Ⅱphase matchings is placed on into 4cm after focus
Place, fundamental frequency pump light is incided in the KDP crystal 5 of II type-Ⅱphase matchings.
(2) fundamental frequency pump light produces frequency doubled light in the KDP crystal 5 of II type-Ⅱphase matchings, by adjusting attenuation factor 3,
Gradually increase the energy of fundamental frequency pump light, frequency multiplication light energy also accordingly increases；
(3) when fundamental frequency pump light optical power density reaches 55.7GWcm2When, produce single order stokes light, i.e. 558.9nm ripples
Long laser；Adjusted by attenuation factor 3 and continue to increase the energy of fundamental frequency pump light, occur second order stokes light successively
(588.9nm) and three rank stokes light (622.1nm)；
(4) first colour filters 6 filter out fundamental frequency pump light, through remaining frequency doubled light and stimulated Raman scattering laser；
(5) second colour filters 7 filter out frequency doubled light, swash through single order, second order, three rank stokes light stimulated Raman scatterings
Light, for application.
Using a kind of laser based on monolithic KDP Cascaded crystals optical frequency variables described in embodiment 2, frequency doubled light has been obtained
532.18nm and its single order stokes light (558.91nm), second order stokes light (588.90nm), three rank stokes light
(622.10nm), spectrum schematic diagram is as shown in Figure 4.The hot spot figure that Fig. 5 produces for laser described in the embodiment of the present invention 2.By interior
It is the single order stokes light (558.91nm) of yellow green successively to outer, orange-yellow second order stokes light (588.90nm), and
Three red rank stokes light (622.10nm).
The tangential crystal of II class frequencys multiplication is as the excited Raman optical maser wavelength that the tangential crystal of I class frequencys multiplication is produced, and Raman
Frequency displacement is consistent.Wherein, single order, second order, the threshold value of the fundamental frequency pump light optical power density of three rank stokes light are respectively 55.7GW/
cm2、71.6GW/cm2、79.5GW/cm2.Fundamental frequency pump energy can be controlled by adjusting attenuation factor 3, single order is realized successively
Stokes light, second order stokes light, three rank stokes light outputs.
Embodiment 7
A kind of method of work of the laser based on monolithic KDP Cascaded crystals optical frequency variables described in embodiment 3, including step
It is as follows：
(1) wavelength that pumping source 1 is produced is 1064nm fundamental frequency pump light, and a diameter of 5mm light is chosen by diaphragm 2
Beam, light beam passes through attenuation factor 3, and after the shrink beam of shrink beam system 8, fundamental frequency pump light impinges perpendicularly on the KDP of I type-Ⅱphase matchings
In crystal 5.
(2) fundamental frequency pump light produces frequency doubled light in the KDP crystal 5 of I type-Ⅱphase matchings, by adjusting attenuation factor 3, by
The energy of cumulative plus fundamental frequency pump light, frequency multiplication light energy also accordingly increases；
(3) adjusted by attenuation factor 3 and continue to increase the energy of fundamental frequency pump light, occur single order, second order, three ranks successively
Stokes light；
(4) first colour filters 6 filter out fundamental frequency pump light, through remaining frequency doubled light and stimulated Raman scattering laser；
(5) second colour filters 7 filter out double-frequency laser, swash through single order, second order, three rank stokes light stimulated Raman scatterings
Light, for application.
Embodiment 8
A kind of method of work of the laser based on monolithic KDP Cascaded crystals optical frequency variables described in embodiment 4, including step
It is as follows：
(1) wavelength that pumping source 1 is produced is 1064nm fundamental frequency pump light, and a diameter of 5mm light is chosen by diaphragm 2
Beam, fundamental frequency pump light sequentially passes through attenuation factor 3, the shrink beam of shrink beam system 8, input mirror 9, impinges perpendicularly on I type-Ⅱphase matchings
In KDP crystal 5, outgoing mirror 10 can pass through part frequency doubled light and stimulated Raman scattering laser, fundamental frequency pump light 1064nm laser warp
The output for realizing frequency doubled light after outgoing mirror 10 reflects again is crossed, frequency multiplication light energy in crystal is improved.
(2) fundamental frequency pump light produces frequency doubled light in the KDP crystal 5 of I type-Ⅱphase matchings, by adjusting attenuation factor 3, by
The energy of cumulative plus fundamental frequency pump light, frequency multiplication light energy also accordingly increases；
(3) adjusted by attenuation factor 3 and continue to increase the energy of fundamental frequency pump light, occur single order, second order, three ranks successively
Stokes light；
(4) first colour filters 6 filter out fundamental frequency pump light, through remaining frequency doubled light and stimulated Raman scattering laser；
(5) second colour filters 7 filter out double-frequency laser, swash through single order, second order, three rank stokes light stimulated Raman scatterings
Light, for application.
Claims (10)
1. a kind of laser based on monolithic KDP Cascaded crystals optical frequency variables, it is characterised in that including what is laid successively along light path
The tangential KDP crystal of pumping source, diaphragm, attenuation factor, frequency multiplication, the first colour filter, the second colour filter；
The pumping source produces laser, and incides in the KDP crystal, and fundamental frequency light is converted into frequency doubled light by the KDP crystal,
Frequency doubled light produces stimulated Raman scattering in the KDP crystal simultaneously, the stimulated Raman scattering laser of frequency doubled light is obtained, described
KDP crystal realizes the optical frequency variable that frequency multiplication is cascaded with stimulated Raman scattering.
2. a kind of laser based on monolithic KDP Cascaded crystals optical frequency variables according to claim 1, it is characterised in that
The cutting angle of the I type-Ⅱphase matchings of the KDP crystal is (θ, φ), and θ span is 40 ° -42 °, and φ span is
44°—46°；
The cutting angle of the II type-Ⅱphase matchings of the KDP crystal is (θ 1, φ 1), and θ 1 span is 58 ° -60 °, φ's 1
Span is 0 ° -1 °.
3. a kind of laser based on monolithic KDP Cascaded crystals optical frequency variables according to claim 2, it is characterised in that θ
=41 °, φ=45 °；θ 1=59 °, φ 1=0 °.
4. a kind of laser based on monolithic KDP Cascaded crystals optical frequency variables according to claim 1, it is characterised in that
The preceding surface of the KDP crystal is plated with frequency doubled light and the stimulated Raman scattering of frequency doubled light thoroughly, to needing to produce high to fundamental frequency light
The high anti-deielectric-coating of laser, the rear surface of the KDP crystal is plated with high to fundamental frequency light anti-, saturating to the frequency doubled light part that needs to produce
The high saturating deielectric-coating of stimulated Raman scattering laser of the frequency doubled light cross, needs produced.
5. a kind of laser based on monolithic KDP Cascaded crystals optical frequency variables according to claim 1, it is characterised in that
The laser also includes lens, and the lens are arranged between the attenuation factor and the KDP crystal along light path, described
Mirror is biconvex lens or planoconvex spotlight.
6. a kind of laser based on monolithic KDP Cascaded crystals optical frequency variables according to claim 1, it is characterised in that
The laser also includes shrink beam system, the shrink beam system along light path be arranged on the attenuation factor and the KDP crystal it
Between.
7. a kind of laser based on monolithic KDP Cascaded crystals optical frequency variables according to claim 6, it is characterised in that
The laser also includes input mirror, outgoing mirror, and the input mirror is arranged on the shrink beam system and the KDP crystal along light path
Between；The outgoing mirror is arranged between the KDP crystal and first colour filter along light path.
8. a kind of laser based on monolithic KDP Cascaded crystals optical frequency variables according to claim 7, it is characterised in that
The input mirror be plated with it is high to fundamental frequency light thoroughly, it is high to the frequency doubled light and the stimulated Raman scattering laser of frequency doubled light that need to produce anti-
Deielectric-coating；The outgoing mirror is plated with frequency doubled light part transmission anti-to fundamental frequency light height, to needing generation, is excited drawing to frequency doubled light
The high saturating deielectric-coating of graceful scattering laser.
9. a kind of laser based on monolithic KDP Cascaded crystals optical frequency variables according to claim 1, it is characterised in that
The pumping source is Nd:YAG laser or Nd:Glass lasers；
The diaphragm is the baffle plate with light hole；
The attenuation factor is any of polarizer, devating prism, neutral-density filter or appoints several combining structures；
First colour filter is plated with anti-, to needing generation frequency doubled light high to fundamental frequency light and the stimulated Raman scattering of frequency doubled light swashs
The high saturating deielectric-coating of light；
Second colour filter is plated with high anti-, frequency doubled light that is being produced to needs the stimulated Raman scattering of frequency doubled light to needing to produce
The high saturating deielectric-coating of laser.
10. the method for work of any described lasers of claim 1-9, it is characterised in that as follows including step：
(1) pumping source produces fundamental frequency pump light, and suitable hot spot bore is chosen by the diaphragm, is by the decay
The energy of the fundamental frequency pump light of the KDP crystal is incided in system control；
(2) fundamental frequency pump light is incident in the tangential KDP crystal of frequency multiplication and produces frequency doubled light, is by adjusting the decay
System, gradually increases the energy of fundamental frequency pump light, and the energy of frequency doubled light also accordingly increases；
(3) when frequency multiplication light energy reaches stimulated Raman scattering threshold value, single order stokes light is produced；By adjusting the decay system
System continues to increase the energy of fundamental frequency pump light, is sequentially generated second order stokes light and three rank stokes light；
(4) first colour filter filters out fundamental frequency pump light, through remaining frequency doubled light and stimulated Raman scattering laser；
(5) second colour filter selects the eyeglass of different plated films as needed, frequency doubled light is filtered out, through required excited Raman
Scattering laser, for application.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109378700A (en) * | 2018-10-22 | 2019-02-22 | 山东大学 | A kind of dual laser based on ethanol water stimulated Raman scattering |
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2017
- 2017-06-21 CN CN201710472844.XA patent/CN107104355A/en active Pending
Non-Patent Citations (2)
| Title |
|---|
| Z.L.GAO ET AL.: "Self-frequency-doubled BaTeMo2O9 Raman laser emitting at 589nm", 《OPTICS EXPRESS》 * |
| 吴志心等: "KDP晶体倍频光的受激拉曼散射与晶体损失的研究", 《第十六届全国光学测试学术交流会》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109378700A (en) * | 2018-10-22 | 2019-02-22 | 山东大学 | A kind of dual laser based on ethanol water stimulated Raman scattering |
| CN109378700B (en) * | 2018-10-22 | 2020-10-27 | 山东大学 | Dual-wavelength laser based on stimulated Raman scattering of ethanol water solution |
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