CN102566197B - Optical parametric frequency multiplication conversion device with phase matching condition insensitive to temperature - Google Patents
Optical parametric frequency multiplication conversion device with phase matching condition insensitive to temperature Download PDFInfo
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- CN102566197B CN102566197B CN201210039454.0A CN201210039454A CN102566197B CN 102566197 B CN102566197 B CN 102566197B CN 201210039454 A CN201210039454 A CN 201210039454A CN 102566197 B CN102566197 B CN 102566197B
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Abstract
The invention belongs to the technical field of laser, specifically, discloses an optical parametric frequency multiplication conversion device capable of realizing that a phase matching condition is insensitive to the temperature. The device is mainly composed of two different linear crystals in cross cascaded manner. For an optical parametric frequency multiplication process of specific wavelength, symbols of first-order partial derivatives of phase mismatch, caused by change of working temperature of the two crystals, to the temperature are opposite. When the working temperature of the crystals deviates from own phase matching temperature, the phase mismatch accumulated in the first crystal can be compensated in the second crystal cascaded behind the first crystal. The device can effectively reduce the sensitivity of the phase matching condition to the temperature in the optical parametric frequency multiplication conversion process. Moreover, the device has the characteristics of having a designable operating wavelength, and can be used for building high average power frequency multiplication conversion laser systems with different wavelengths.
Description
Technical field
The invention belongs to laser technology field, be specifically related to one and can realize the position temperature-resistant optical parameter doubling conversion device of condition that matches.
Background technology
Optical parameter frequency-doubled conversion technology can be expanded the operation wavelength of various lasing light emitters, and it can obtain from the lasing light emitter of a fixed frequency coherent radiation of a series of different wave lengths, to meet the needs of various practical applications.Now, optical parameter frequency multiplication transformation technology has been widely used on the lasing light emitter of monopulse output or low average power.But the on the low side and undesirable beam quality of conversion efficiency causing due to thermal effect has seriously restricted the application of frequency-doubled conversion technology on high-average power lasing light emitter.The reason that causes frequency doubled light can not realize high-average power output is many-sided, and one of them main cause is exactly that nonlinear crystal can absorb the energy of fundamental frequency light and frequency doubled light and produce thermal gradient, and then makes its inside occur temperature difference.Because crystal refractive index can change with the difference of temperature, so, on crystal xsect, the uneven distribution of refractive index can make monoblock crystal can not meet the position condition that matches simultaneously, thereby cause the decline of frequency-doubling conversion efficiency and the deterioration of beam quality, excessive thermal gradient even can cause damage to crystal.
In order to control thermal load and compensation for the thermal effect in the nonlinear crystal of high-average power frequency-doubled conversion, numerous research institutions take U.S. row Buddhist More laboratory (LLNL) as representative have proposed various methods, comprising methods such as beam shaping and the logical light face air cooling of the thin crystal design of multi-disc.But, because these Technology Needs are used a lot of extra devices, cause its complex structure, and whole structure is not fairly obvious, and the frequency-doubled conversion of high-average power is made little progress.In recent years, the appearance of YCOB crystal, has substantially promoted the development of high-average power frequency-doubled conversion technology.But general, a kind of nonlinear crystal can only be realized frequency-doubled conversion position insensitive to temperature of condition that match to a kind of wavelength, at its all band, the doubly frequent thermal effect that is limited to crystal of high-average power.Thus, this method that depends on nonlinear crystalline material self optical characteristics does not have general applicability.
Summary of the invention
The position phase mismatch problems causing because temperature distributing disproportionation is even facing for current high-average power frequency-doubled conversion, the object of the present invention is to provide a kind of optical parameter doubling conversion device that can be used for high-average power lasing light emitter.
What the present invention proposed can realize the position temperature-resistant doubling conversion device of condition that matches, and is specifically made up of by intersecting the mode of cascade two kinds of different nonlinear crystals.Wherein, for the optical parameter frequency multiplication process of specific some wavelength, the symbol of the single order local derviation of the position phase amount of mismatch that these two kinds of crystal cause because working temperature changes to temperature is contrary.
Nonlinear crystal can absorb the energy of fundamental frequency light and frequency doubled light and produce thermal gradient, and then makes crystal on its xsect, occur the uneven distribution of temperature.And only have the part crystal of work phase matching temperature in place, could meet the position condition that matches.Concerning all the other most crystal, depart from a phase matching temperature, mean and can introduce input fundamental frequency light and the position phase amount of mismatch k exporting between frequency doubled light.It ought a position phase matching temperature be 20 that Fig. 1 has provided
owhen C, several typical nonlinear crystals: KH
2pO
4(KDP) (short dash line), LiB
3o
5(LBO) (dotted line), BaB
2o
4(BBO) (pecked line) and YCOB(xy plane: dotted line; Xz plane: solid line), due to the working temperature curve map that the position phase amount of mismatch that causes changes with the long difference of incident fundamental light wave the single order local derviation of temperature that changes.To the present invention particularly importantly, in very wide spectral range (from ~ 700 nm to being greater than 2 μ m), can both find (existing) two kinds of crystal that thermic position phase amount of mismatch is contrary to the single order local derviation symbol of temperature, the KDP crystal of for example 1064 nm is with lbo crystal, and the bbo crystal of 1550 nm is with YCOB crystal.
The present invention's structure used as shown in Figure 2, according to different needs, can adopt these two kinds different nonlinear crystals of two or polylith to intersect the design proposal of cascade, as the actuating medium of non-linear frequency-doubled conversion.Due to the existence of thermal effect, in the time that the working temperature of crystal departs from its phase matching temperature, these two kinds of crystal are no longer satisfied the condition (k ≠ 0) that matches all, and along with the aggravation of departure degree, the position phase mismatch causing can be more serious.But, if the symbol of the thermic position phase amount of mismatch of these two kinds of crystal is contrary, that is to say that one of them k is greater than 0, and another k is less than 0, the position phase amount of mismatch of accumulating in the first crystal so can be compensated in level is associated in the second crystal of face thereafter.The amount of crystals using is more, and its condition that matches is more insensitive to temperature.Carry out in order to guarantee that frequency-doubled conversion process can be stablized, generally can adopt the design proposal of two to four crystal intersections cascade.What in figure, provide is the structure that includes the cascade of four crystal intersections.
In use, corresponding different actual conditions, there is an optimal value in the Length Ratio regular meeting of adjacent two different crystals, makes the position of this optical parameter doubling conversion device match condition to least sensitivity of temperature.This optimal value is to be determined with effective nonlinear coefficient by the thermic position phase amount of mismatch of crystal, can roughly obtain by the method for Computer Numerical Simulation solution nonlinear coupled-wave equation group.According to different service conditions, this optimal value can be different, and between these optimal values, be do not have associated.The present invention, to the no requirement (NR) of adjacent two different crystal width ratio, only needs the bore of crystal can allow light beam pass through completely.This device can reduce the optical parameter frequency-doubled conversion process meta sensitivity of condition to temperature that match effectively.And it also has the programmable advantage of operation wavelength, can be for building the high-average power frequency-doubled conversion laser system of different wave length.
This doubling conversion device of the present invention is not only simple in structure, do not need to use extra device, and successful.The more important thing is, this device is programmable to wavelength, as long as select suitable crystal, just can on interested wavelength, realize the position temperature-resistant frequency-doubled conversion of condition that matches.
Accompanying drawing explanation
Figure 1 shows that position phase amount of mismatch that several typical non linear crystal cause because working temperature the changes single order local derviation to temperature, the curve map changing with the long difference of incident fundamental light wave.
Fig. 2 is the position temperature-resistant optical parameter doubling conversion device of the condition schematic diagram that matches of the design according to the present invention.
Figure 3 shows that the Experimental equipment in order to show the Proof-Of Principle experiment that the present invention carries out.
Figure 4 shows that the temperature variant curve map of different frequency-doubled conversion system frequency-doubling conversion efficiency that experiment obtains.
Number in the figure: 1 is nonlinear crystal A, 2 is the nonlinear crystal B adjacent with nonlinear crystal A, 3 is picosecond laser source, arrowband, and 4 is psec fundamental frequency light, and 5 is the first nonlinear crystal, 6 for passing through double-frequency laser and the remaining basic frequency laser after the first nonlinear crystal, 7 is the second nonlinear crystal, and 8 for passing through double-frequency laser and the remaining basic frequency laser after the second nonlinear crystal, and 9 is optical filter, 10 is double-frequency laser, and 11 is laser powermeter.
Embodiment
Further describe the present invention below in conjunction with accompanying drawing.
The position that Figure 2 shows that according to the present invention design temperature-resistant optical parameter doubling conversion device of condition that matches.This device comprises two kinds of different nonlinear crystals (A and B), adopts these two kinds different nonlinear crystals of two or polylith to intersect the design proposal of cascade, as the actuating medium of non-linear frequency-doubled conversion.Wherein, for the optical parameter frequency multiplication process of specific some wavelength, the symbol of the single order local derviation of the position phase amount of mismatch that these two kinds of crystal cause because working temperature changes to temperature is contrary.Main situation about describing while only having two crystal below.
Suppose, in room temperature (20
oc) time, two blocks of nonlinear crystals for frequency multiplication all meet the position condition that matches, and along with the carrying out of high-average power frequency-doubled conversion process, due to the accumulation gradually of thermal effect, temperature in nonlinear crystal can depart from original temperature, destroys the position the having met condition that matches.
Due to incident fundamental frequency light and frequency doubled light position phase mismatch, when the phasic difference of accumulative total between them reaches π, that is to say in intracrystalline action length and equal its coherent length (L
cwhen=π/k), the new frequency doubled light producing will be offset with the frequency doubled light producing is before relevant, starts to occur the inverse process of frequency multiplication---reflux.Along with continuing to increase of crystal action length, frequency doubled light can convert back fundamental frequency light, and conversion efficiency can reduce gradually.
But the symbol of the thermic position phase amount of mismatch of two frequency-doubling crystals that adopt in the present invention is contrary, that is to say that one of them k is greater than 0 and another k is less than 0, phasic difference (the Δ φ between fundamental frequency light and the frequency doubled light of accumulating in first crystal A so
1=k
1l
1) can in being associated in second crystal B of face thereafter, level be compensated (Δ φ
2=k
2l
2).So in this case, as long as guarantee that, in whole frequency-doubled conversion process, the phasic difference in two blocks of different nonlinear crystals is all less than π, the frequency doubled light of generation just can remain relevant and increase, corresponding the positive process of frequency-doubled conversion.Therefore, frequency-doubling conversion efficiency can reduce greatly to the sensitivity of temperature variation, and then realizes the position temperature-resistant optical parameter frequency-doubled conversion of condition that matches.And the amount of crystals of use is more, conversion efficiency is acted upon by temperature changes can be less.
Fig. 3 is to be the Experimental equipment in order to show the Proof-Of Principle experiment that the present invention carries out.
This device comprises according to the present invention the position of the design temperature-resistant optical parameter frequency-doubled conversion of the condition system that matches, and laser powermeter for measuring.Wherein:
The picosecond laser 4 of picosecond laser source, arrowband 3 outgoing, by meeting the first nonlinear crystal 5 of certain phase-matching angle, carries out optical parameter frequency-doubled conversion (SHG).Then, the double-frequency laser obtaining and remaining basic frequency laser 6 are passed through to the second nonlinear crystal 7, again carry out SHG.After the remaining basic frequency laser filtering that there is no participation role, measure the frequency doubled light 10 finally obtaining by optical filter 9 with laser powermeter 11.In specific experiment, this device uses two KDP crystal reasonable in design to follow the second nonlinear crystal 7 as the first nonlinear crystal 5 respectively with lbo crystal, as the actuating medium of optical parameter frequency-doubled conversion system.As can be seen from Figure 1, for the frequency multiplication process of 1064 nm, the symbol of these two kinds of nonlinear crystal thermic position phase amount of mismatch is contrary.Meanwhile, these two crystal are placed on respectively in two digital temperature controlling stoves, by regulating the working temperature of nonlinear crystal in temperature control furnace, finally can obtain frequency-doubling conversion efficiency variation with temperature curve.
Fig. 4 has provided the temperature variant curve map of frequency-doubling conversion efficiency obtaining in experiment, and meanwhile, the frequency-doubled conversion system for the single crystal of traditional use as nonlinear medium, has also provided the temperature variant curve of its output frequency-doubling conversion efficiency in figure.For fair, the two kinds of different frequency-doubled conversion system bits sensitivity of condition to temperature that match relatively intuitively, in figure, every kind of frequency-doubled conversion system is all designed to match in condition meeting position, can obtain suitable frequency-doubling conversion efficiency.As can be seen from the figure,, along with the working temperature of nonlinear crystal departs from its phase matching temperature gradually, the appearance of position phase mismatch can cause the decline of frequency-doubling conversion efficiency, more responsive to temperature, declines sooner.And if by two kinds in 1064 nm frequencys multiplication to temperature variation all very sensitive KDP crystal (triangle) with lbo crystal (rectangle symbol), intersect cascade (circle symbol), just can in larger range of temperature, improve frequency-doubling conversion efficiency.Same, this method can also be used on other frequency multiplication wavelength, for example 1550 nm.Can on this wave band, realize the position temperature-resistant frequency-doubling crystal of condition that matches and still do not find at present.
Can find out, proposed by the invention two kinds of different nonlinear crystals are intersected to cascade, as the doubling conversion device of non-linear frequency-doubled conversion actuating medium, can solve preferably because the inhomogeneous of Temperature Distribution caused a phase mismatch, thereby cause the problem that frequency-doubling conversion efficiency reduces and beam quality worsens.It is not only simple in structure, does not need to use extra device, and successful.The more important thing is, this device is programmable to wavelength, as long as select suitable crystal, just can on interested wave band, realize the position temperature-resistant frequency-doubled conversion of condition that matches.Can be for building the high-average power frequency-doubled conversion laser system of different wave length.
Claims (2)
1. the position temperature-resistant optical parameter doubling conversion device of condition that matches, is characterized in that intersecting cascade by two kinds of different nonlinear crystals forms, as the actuating medium of non-linear frequency-doubled conversion, wherein:
For the optical parameter frequency multiplication process of specific some wavelength, the symbol of the single order local derviation of the position phase amount of mismatch that these two kinds of crystal cause because working temperature changes to temperature is contrary.
2. according to claim 1 the temperature-resistant optical parameter doubling conversion device of condition that matches, is characterized in that the length ratio of adjacent two blocks of different nonlinear crystals exists an optimal value.
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| US7414778B1 (en) * | 2007-10-30 | 2008-08-19 | Corning Incorporated | Wavelength conversion devices and fabrication methods for same |
| CN101506730A (en) * | 2006-10-27 | 2009-08-12 | 松下电器产业株式会社 | Short wavelength light source and laser image forming device |
| CN102354072A (en) * | 2011-09-21 | 2012-02-15 | 苏州天弘激光股份有限公司 | Implementation method for laser opening temperature impact resistant non-linear optical frequency conversion |
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| CN101506730A (en) * | 2006-10-27 | 2009-08-12 | 松下电器产业株式会社 | Short wavelength light source and laser image forming device |
| US7414778B1 (en) * | 2007-10-30 | 2008-08-19 | Corning Incorporated | Wavelength conversion devices and fabrication methods for same |
| CN102354072A (en) * | 2011-09-21 | 2012-02-15 | 苏州天弘激光股份有限公司 | Implementation method for laser opening temperature impact resistant non-linear optical frequency conversion |
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