CN206893994U - A kind of laser based on monolithic KDP Cascaded crystals optical frequency variables - Google Patents
A kind of laser based on monolithic KDP Cascaded crystals optical frequency variables Download PDFInfo
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Abstract
A kind of laser based on monolithic KDP Cascaded crystals optical frequency variables is the utility model is related to, 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 the utility model monolithic frequency multiplication 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, passes through the different outputs that green glow, yellow orange light and feux rouges can be realized through spectrum colour filter of application.Both it can be used as green, yellow, red trichromatism laser signal light, and can also be used as yellow light sources to be applied to the fields such as laser medicine field, spectroscopy, military affairs, meteorological field.The utility model has the characteristics that simple for structure, stability is strong, cost is relatively low, is widely used, is simple to operate, be practical.
Description
Technical field
A kind of laser based on monolithic KDP Cascaded crystals optical frequency variables is the utility model is related to, belongs to laser technology neck
Domain.
Background technology
Now, laser is widely used in all trades and professions, closely bound up with the life of people.But the wavelength of laser is limited, obtains
The most frequently used technology path for obtaining new wavelength is neodymium-doped yttrium-aluminum garnet (Nd:) or nd glass laser (Nd YAG:) etc. glass into
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, can
Gold-tinted, orange light, feux rouges in acquisition visible ray etc..The laser of yellow orange wave band is in laser medicine field, spectroscopy, military affairs, meteorology
The multiple fields such as field, information storage have important application.In recent years, people are directed to the generation of yellow orange wave band of laser always.
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 carries out frequency multiplication conversion 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 are dashed forward
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 exports.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 exports.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, is 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 exports.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, two pieces of crystal of Raman crystal and frequency-doubling crystal, such as R.P.Mildren et are required for
Al., Optics express12 (5), 785 (2004), using KGd (WO4)2Crystal carries out Raman conversion, for different pumpings
The a plurality of spectral line that polarization direction obtains gold-tinted to yellow orange light respectively exports.Tracavity optical frequency conversion needs gain medium, drawn
Graceful crystal, frequency-doubling crystal, Q-modulating device or from raman laser gain media, frequency-doubling crystal, Q-modulating device, and design it is suitable
Laser cavity structure and complicated plated film mode.Domestic correlation technique such as Chinese patent literature CN101308994A mandate is practical new
Type patent, Patent design folding cavity self-raman frequency doubling completely solid yellow laser.It is low to be limited to the peak power of fundamental frequency light,
Transformation efficiency is poor, and hardly possible obtains high-power gold-tinted output.
It is simple in construction, cost is low, few using kind of crystalline, have gold-tinted and other visible wavelengths concurrently and export, and apply
Extensive laser has important application value and scientific research value.
The content of the invention
The defects of in order to overcome prior art to exist and deficiency, the utility model provide one kind and are based on monolithic KDP crystal
Cascade the laser of optical frequency variable.
Term is explained：
KDP crystal, potassium dihydrogen phosphate crystal.
The technical solution of the utility model is：
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,
Frequency multiplication and the optical frequency variable of stimulated Raman scattering cascade are 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 angles 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), and θ 1 span is 58 ° -60 °, φ
1 span is 0 ° -1 °；
It is further preferred that θ=41 °, φ=45 °；θ 1=59 °, φ 1=0 °.
It is preferable according to the utility model, the preceding surface of the KDP crystal be plated with it is high to fundamental frequency light thoroughly, to caused by needs
The high anti-deielectric-coating of the stimulated Raman scattering laser of frequency doubled light and frequency doubled light, the rear surface of the KDP crystal is plated with to fundamental frequency light
High anti-, saturating to frequency doubled light part transmission, the stimulated Raman scattering laser height to frequency doubled light caused by needs caused by needs Jie
Plasma membrane.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
I.e. described KDP crystal produces the surface of the stimulated Raman scattering laser of frequency doubled light and frequency doubled light.
Preferable according to the utility model, the laser also includes lens, and the lens are arranged on described decline along light path
Subtract between system and the KDP crystal, the lens are biconvex lens or planoconvex spotlight.To improve the fundamental frequency light of entrance crystal
Power density.
Preferable according to the utility model, the laser also includes shrink beam system, and the shrink beam system is set along light path
Between the attenuation factor and the KDP crystal.To improve the power density of the fundamental frequency light of entrance crystal.
Preferable according to the utility model, the laser also includes input mirror, outgoing mirror, and the input mirror is set along light path
Put between the shrink beam system and the KDP crystal；The outgoing mirror is arranged on the KDP crystal and described first along light path
Between colour filter.
It is preferable according to the utility model, the input mirror be plated with it is high to fundamental frequency light thoroughly, to frequency doubled light caused by needs with
The high anti-deielectric-coating of the stimulated Raman scattering laser of frequency doubled light；The outgoing mirror be plated with it is high anti-to fundamental frequency light, to caused by needs
Frequency doubled light part passes through, the high saturating deielectric-coating of stimulated Raman scattering laser to frequency doubled light.Fundamental frequency pump light is anti-by outgoing mirror
The output of frequency doubled light is realized after penetrating again, frequency doubled light realizes excited Raman optical frequency variable again after outgoing mirror part is reflected
Output.
Preferable according to the utility model, 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 frequency doubled light caused by needs and frequency doubled light excited Raman high to fundamental frequency light and dissipated
Penetrate the high saturating deielectric-coating of laser；
Second colour filter be plated with it is high anti-to frequency doubled light caused by needs, to the excited Raman of frequency doubled light caused by needs
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
Cumulative plus fundamental frequency pump light energy, the energy of frequency doubled light also accordingly increase；
(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.
The beneficial effects of the utility model are：
1. output wavelength is more, it is widely used.The utility model can realize the multistage stokes of frequency doubled light and frequency doubled light
Light output, it can realize that one or more wavelength export by changing colour filter.For example, it is used as pump by the use of the laser of 1064nm wavelength
Pu source can obtain the laser of 532nm, 558.9nm, 588.9nm, 622.1nm equiwavelength.558.9nm and 588.9nm gold-tinted swashs
Light has important application in multiple fields such as laser medicine field, spectroscopy, military affairs, meteorology, information storages.By the green of 532nm
Light, 588.9nm yellow orange light, 622.1nm feux rouges, which are combined, can be used as green, yellow, red trichromatism laser signal light.
2. simple for structure, stability is strong.The utility model realizes the cascade of frequency multiplication excited Raman simultaneously in one piece of crystal
Optical frequency variable, it is simple in construction compared with other intracavitary yellow orange light output technologies, avoid what resonator and Film Design were brought
Unstability, improve the stability of laser output.The utility model is easy to and existing ripe Nd:YAG or Nd:glass
Pulse laser 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 utility model using pulse laser as pumping source, can be nanosecond laser,
Picosecond laser, corresponding nanosecond pulse, picopulse can be directly obtained.KDP crystal techniques are ripe, are easy to growing large-size
Monocrystalline, it is of relatively low cost.
Brief description of the drawings
Fig. 1 is the structural representation of laser described in the utility model embodiment 1.
Fig. 2 is that the stimulated Raman scattering of frequency doubled light and frequency doubled light caused by laser described in the utility model embodiment 1 swashs
The spectral schematic of light.
Fig. 3 is hot spot figure caused by laser described in the embodiment of the present invention 1.
Fig. 4 is that the stimulated Raman scattering of frequency doubled light and frequency doubled light caused by laser described in the utility model embodiment 2 swashs
The spectral schematic of light.
Fig. 5 is hot spot figure caused by laser described in the embodiment of the present invention 2.
Fig. 6 is the structural representation of laser described in the utility model embodiment 3.
Fig. 7 is the structural representation of laser described in the utility model embodiment 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 utility model 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
Frequency multiplication and the optical frequency variable of stimulated Raman scattering cascade are 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), θ=41 °, φ=45 °, and printing opacity mirror polish does not plate
Film, length 32mm.
Pumping source 1 is the PY61 types Nd of Continuum companies production: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, to adjust the power of fundamental frequency pumping laser.
First colour filter 6 be plated with it is high anti-to fundamental frequency light (1064nm), frequency doubled light caused by needs and frequency doubled light are excited
The high saturating deielectric-coating of Raman scattering laser (500-700nm)；
Second colour filter 7 be plated with it is high anti-to frequency doubled light caused by needs (532nm), frequency doubled light caused by needs is excited
The high saturating deielectric-coating of Raman scattering laser (550-700nm).
A kind of method of work of the laser based on monolithic KDP Cascaded crystals optical frequency variables described in the present embodiment, including step
It is rapid 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, KDP crystal 5 is placed on after focus at 4cm, 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
Cumulative plus fundamental frequency pump light energy, frequency multiplication light energy also accordingly increase；
(3) when fundamental frequency pump light optical power density reaches 57.1GWcm2When, produce single order stokes light, i.e. 558.9nm ripples
Long laser；The energy for continuing to increase fundamental frequency pump light is adjusted by attenuation factor 3, occurs 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, 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.
Spectral schematic such as Fig. 2 of the stimulated Raman scattering laser of frequency doubled light caused by the present embodiment laser and frequency doubled light
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 of 1064nm caused by pumping source 1 is focused on using lens 4, 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 of single order stokes light (558.91nm), the second order stokes light (588.90nm) of frequency doubled light and frequency doubled light
(622.10nm).Single order, second order, the threshold value of 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.Fig. 3 is hot spot figure caused by laser described in the embodiment of the present invention 1.By
Interior is the single order stokes light (558.91nm) of yellow green successively to outer, orange-yellow second order stokes light (588.90nm), with
And three red rank 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 2
A kind of laser based on monolithic KDP Cascaded crystals optical frequency variables according to embodiment 1, its difference be, 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。
A kind of method of work of the laser based on monolithic KDP Cascaded crystals optical frequency variables described in the present embodiment, including step
It is rapid as follows：
(1) wavelength caused by pumping source 1 is 1064nm fundamental frequency pump light, and a diameter of 5mm light is chosen by diaphragm 2
Beam, light beam are 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 are 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 the energy of increase fundamental frequency pump light, frequency multiplication light energy also accordingly increase；
(3) when fundamental frequency pump light optical power density reaches 55.7GWcm2When, produce single order stokes light, i.e. 558.9nm ripples
Long laser；The energy for continuing to increase fundamental frequency pump light is adjusted by attenuation factor 3, occurs 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, 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), spectral schematic is as shown in Figure 4.It is excited to draw caused by the tangential crystal of II class frequencys multiplication and the tangential crystal of I class frequencys multiplication
Graceful optical maser wavelength is the same, and Raman frequency shift is consistent.Wherein, single order, second order, the fundamental frequency pump light luminous power of three rank stokes light
The threshold value of density is respectively 55.7GW/cm2、71.6GW/cm2、79.5GW/cm2.Fundamental frequency pump can be controlled by adjusting attenuation factor 3
Pu light energy, realize single order stokes light, second order stokes light, three rank stokes light outputs.Fig. 5 is the institute of the embodiment of the present invention 2
State hot spot figure caused by laser.From inside to outside, it is the single order stokes light (558.91nm) of yellow green successively, orange-yellow two
Rank stokes light (588.90nm), and three red rank stokes light (622.10nm).
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, and 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 realize the output of excited Raman optical frequency variable again after the part of outgoing mirror 10 is reflected.
More than the 10% of laser original transformation efficiency can be improved.
Claims (7)
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.
A kind of 2. 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 be plated with it is high to fundamental frequency light thoroughly, to the stimulated Raman scattering of frequency doubled light caused by needs and frequency doubled light
The high anti-deielectric-coating of laser, the rear surface of the KDP crystal are plated with high to fundamental frequency light anti-, saturating to frequency doubled light part caused by needs
Cross, the high saturating deielectric-coating of stimulated Raman scattering laser to frequency doubled light caused by needs.
A kind of 3. 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.
A kind of 4. 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.
A kind of 5. laser based on monolithic KDP Cascaded crystals optical frequency variables according to claim 4, 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.
A kind of 6. laser based on monolithic KDP Cascaded crystals optical frequency variables according to claim 5, it is characterised in that
The input mirror is plated with saturating to fundamental frequency light height, anti-to the stimulated Raman scattering laser of frequency doubled light caused by needs and frequency doubled light height
Deielectric-coating；The outgoing mirror be plated with it is high anti-to fundamental frequency light, frequency doubled light part caused by needs is passed through, frequency doubled light is excited to draw
The high saturating deielectric-coating of graceful scattering laser.
7. according to a kind of any described lasers based on monolithic KDP Cascaded crystals optical frequency variables of claim 1-6, its feature
It is, 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 frequency doubled light caused by needs and frequency doubled light stimulated Raman scattering high to fundamental frequency light and swashed
The high saturating deielectric-coating of light；
Second colour filter be plated with it is high anti-to frequency doubled light caused by needs, to the stimulated Raman scattering of frequency doubled light caused by needs
The high saturating deielectric-coating of laser.
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