CN102354072B - Implementation method for laser opening temperature impact resistant non-linear optical frequency conversion - Google Patents
Implementation method for laser opening temperature impact resistant non-linear optical frequency conversion Download PDFInfo
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- CN102354072B CN102354072B CN 201110280940 CN201110280940A CN102354072B CN 102354072 B CN102354072 B CN 102354072B CN 201110280940 CN201110280940 CN 201110280940 CN 201110280940 A CN201110280940 A CN 201110280940A CN 102354072 B CN102354072 B CN 102354072B
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Abstract
The invention provides an implementation method for laser opening temperature impact resistant non-linear optical frequency conversion. In the method, a fundamental frequency laser (1), optical crystals (2 and 3) and temperature control systems (7 and 8) are involved; two sets of non-linear optical frequency conversion devices are utilized; the temperatures of the two sets of non-linear optical frequency conversion devices are respectively set slightly higher and slightly lower than an optimal phase matching temperature; and when the laser is opened to make a proportion integration differentiation (PID) temperature control system generate temperature fluctuation within a certain range, the crystals in the two sets of systems respectively deviate from and approach the optimal phase matching temperature more, so that the constant overall conversion efficiency is maintained. By the method, the problem of output laser power fluctuation when the fundamental frequency laser is opened to cause the temperature fluctuation of the temperature control systems is solved; and by the implementation method for the laser opening temperature impact resistant non-linear optical frequency conversion, the defect of laser output power fluctuation of frequency conversion laser output power caused by the temperature fluctuation of the non-linear optical crystals when the fundamental frequency laser is just opened through the non-linear optical frequency conversion is overcome.
Description
[technical field]
The present invention relates to nonlinear optics, espespecially a kind of anti-temperature shock nonlinear optical frequency conversion implementation method of opening the light.Be mainly used in the production run of nonlinear optical frequency conversion equipment.
[background technology]
Nonlinear optical frequency conversion technology is a kind of effective way of expanded laser light frequency range, wherein affects the most key factor of frequency conversion efficiency, is the phase matching problem of nonlinear optical crystal.Adopting the method for temperature phase matching, is phase matching method the most commonly used in the nonlinear optics frequency conversion.The nonlinear optical frequency conversion device of prior art, comprise optical crystal and temperature control system, a crystal is adopted in a frequency transformation often, and it is positioned in temperature control system, by pid control mode, keep its temperature constant in the position of its optimum phase matching temperature spot.Carry out nonlinear optical frequency conversion by the method, when basic frequency laser is opened, because nonlinear optical crystal absorbs a small amount of basic frequency laser, its temperature has a small amount of rising, and the PID dispatch control system is according to the conversion of ambient temperature, can change heating or the refrigerating capacity of nonlinear crystal, thereby make the temperature of nonlinear optical crystal, after departing from its optimum phase matching temperature, a process that returns to the initial setting temperature is arranged, particularly when pid parameter does not arrange fully rationally, even produce damped oscillation.And for nonlinear optics temperature phase matched frequency conversion method, its conversion efficiency changes with the nonlinear optical crystal temperature variation.Nonlinear optical crystal LBO as maximum in present use is just very responsive to temperature.The fluctuating of temperature causes that the nonlinear optics conversion efficiency changes, and finally has influence on the output power of laser after frequency transformation.This specific character of nonlinear optics temperature phase matching, very huge for the impact of the equipment of the frequent switch laser of needs as this in laser marking machine, can cause when just opening laser, the unsettled problem of laser output power finally has influence on the effect of marking.
List of references: High-efficiency and narrow-linewidth operation of a two-crystal β-BaB2O4 optical parametric oscillator, W.R.Bosenberg et al., Appl.Phys.Lett., 1989,55:1952
[summary of the invention]
Shortcoming for prior art, the object of the present invention is to provide a kind of can overcome nonlinear optical frequency conversion and just opened the basic frequency laser device time, the anti-temperature shock nonlinear optical frequency conversion implementation method of opening the light that the laser output power that frequency conversion laser device output power causes due to the nonlinear optical crystal temperature fluctuation rises and falls.
The technical solution adopted for the present invention to solve the technical problems is: a kind of anti-temperature shock nonlinear optical frequency conversion implementation method of opening the light, relate to basic frequency laser device, nonlinear optical crystal and temperature control system, and it is characterized in that comprising the steps:
1. according to the specific requirement of the nonlinear optical frequency conversion that will carry out, design and process two blocks of nonlinear optical crystals;
Two blocks of nonlinear optical crystals that 2. will process are placed in respectively in two cover materials and measure-alike temperature control system, and have kept crystal to contact with the intact of temperature control system;
3. according to the size of basic frequency laser power, be determined by experiment the maximum relief volume of caused nonlinear optical crystal temperature in basic frequency laser device opening procedure;
4. the system that two covers is comprised nonlinear optical crystal is positioned in laser optical path, regulates its temperature by temperature control system, finds respectively its optimum phase matching temperature;
5. set respectively the temperature of two cover temperature control systems, make its respectively greater than with less than separately optimum phase matching temperature, greater than with amount less than the optimum phase matching temperature, determined maximum temperature relief volume in being 3., thereby complete compensation, make the conversion efficiency of whole converter plant keep constant in the process that laser is opened.
The nonlinear optical frequency conversion method that the present invention uses is the temperature phase matching method.
Described two optical crystals can be two bulk matter, cut direction, measure-alike nonlinear optical crystal, can be also two bulk matter, cut direction, nonlinear optical crystal that size is different.
Described two blocks of nonlinear optical crystals that will process are placed in respectively the two identical temperature control systems of cover, can make two cover temperature control systems that identical temperature characterisitic is arranged.
The described two identical temperature control systems of cover can be pid control mode or the temperature control system of other control modes, and when external condition changed, the two identical temperature control systems of cover had identical temperature fluctuation.
The described device that two covers are comprised nonlinear optical crystal and temperature control system is positioned in laser optical path, find respectively again the optimum phase matching temperature of two cover systems by regulating its temperature, even be two identical due to two bulk matter, that cutting angle is identical optical crystals, because there is deviation in the position of its placement, its optimum phase matching temperature also is not quite similar.
The described maximum relief volume of determining caused optical crystal temperature in basic frequency laser device opening procedure by test, can be respectively two cover temperature control systems to be put into light path to measure, can be also two cover temperature control systems to be put into light path simultaneously measure, because crystal is small to the uptake of basic frequency laser, measure even two cover systems are put into light path simultaneously, also can think identical by the basic frequency laser watt level of two crystal.
Described basic frequency laser device can be all solid state laser, can be also the laser instrument of other type.
The described optimum phase matching temperature of respectively the control temperature of two cover temperature control systems being set for respectively above and below separately, to cause in order to open at the basic frequency laser device in the fluctuating process of two cover temperature control system temperature, the temperature of two optical crystals is more approaching and away from its optimum phase matching temperature respectively, thereby makes total conversion efficiencies of two cover temperature control systems keep constant.
Described frequency conversion system can apply to frequency transformation outside the chamber, also can apply to frequency transformation in the chamber.
The present invention can apply to the nonlinear optics frequency multiplication, also can apply to nonlinear optics and frequency, also can apply to the nonlinear optics difference frequency.
The present invention utilizes two cover temperature control systems, and two nonlinear optical frequency conversion crystal that are positioned at temperature control system have identical material, cut direction, physical dimension, and its temperature is arranged to respectively optimum phase matching temperature above and below separately, open when the fundamental laser light device and cause that two cover temperature control systems are when having identical temperature fluctuation, the conversion efficiency of two cover systems compensates mutually, when having solved the basic frequency laser device and having caused the nonlinear optical crystal temperature fluctuation, the problem that the laser output power after frequency conversion rises and falls.
The invention has the beneficial effects as follows: the nonlinear optical frequency conversion device that adopts the present invention to produce can overcome in the nonlinear optical frequency conversion process, when just opening the basic frequency laser device, the frequency conversion laser output power is because the laser output power that the nonlinear optical crystal temperature fluctuation causes rises and falls, the laser instrument that uses the method to make is specially adapted to the laser equipment such as frequent switch lasers such as laser marking machines.
[description of drawings]
The invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is the green laser schematic diagram of cavity external frequency multiplication 532nm;
Fig. 2 is the theoretical calculating chart of optical crystal normalization conversion efficiency.
In Fig. 1: 1-basic frequency laser device (1064nm), 2-the first nonlinear optical crystal, 3-the second nonlinear optical crystal, 4-wedge spectroscope, 5-residue laser (1064nm), the green laser of 6-frequency multiplication (532nm), 7-the first temperature control system, 8-the second temperature control system.
[embodiment]
Referring to accompanying drawing, a kind of anti-temperature shock nonlinear optical frequency conversion implementation method of opening the light of the present invention relates to basic frequency laser device 1, nonlinear optical crystal 2,3 and temperature control system 7,8, it is characterized in that comprising the steps:
1. according to the specific requirement of the nonlinear optical frequency conversion that will carry out, design and process two blocks of nonlinear optical crystals 2,3;
Two blocks of nonlinear optical crystals 2,3 that 2. will process are placed in respectively in two cover materials and measure-alike temperature control system 7,8, and have kept crystal to contact with the intact of temperature control system;
3. according to the size of basic frequency laser power, be determined by experiment the maximum relief volume of caused nonlinear optical crystal temperature in basic frequency laser device 1 opening procedure;
4. the system that two covers is comprised nonlinear optical crystal is positioned in laser optical path, regulates its temperature by temperature control system 7,8, finds respectively its optimum phase matching temperature;
5. set respectively two cover temperature control systems 7,8 temperature, make its respectively greater than with less than separately optimum phase matching temperature, greater than with amount less than the optimum phase matching temperature, determined maximum temperature relief volume in being 3., thereby complete compensation, make the conversion efficiency of whole converter plant keep constant in the process that laser is opened.
In an embodiment of the present invention, described basic frequency laser device 1 is all solid state laser.
In an embodiment of the present invention, described two optical crystals 2,3 are two bulk matter, cut direction, measure-alike nonlinear optical crystal.
Take the green laser of cavity external frequency multiplication 532nm as example, concrete utilization of the present invention is described.Fig. 1 is that the nonlinear optics frequency-changer crystal is selected the lbo crystal of I class phase matching with the green laser schematic diagram of cavity external frequency multiplication 532nm.Two lbo crystal sizes are 4 * 4 * 15mm, and cutting angle is Φ=90 °, Θ=0 °.When placing over against basic frequency laser, the optimum phase matching temperature of lbo crystal is 150 ℃.Two optical crystals are placed in temperature control system, and temperature control system is regulated its temperature by pid control mode, and can survey and show crystal temperature effect.Basic frequency laser is 1064nm laser, enters respectively two optical crystals.If the laser of fundamental frequency 1064nm process focus lamp should be noted two crystal are positioned over respectively isometric position, focus both sides that such two crystal inner laser spot sizes are identical, having guaranteed has identical laser power density in two crystal.Laser after frequency conversion is through the wedge spectroscope, and realization residue 1064nm basic frequency laser separates with the 532nm double-frequency laser.
Curve in Fig. 2 is the function curve that the theoretical normalization frequency conversion conversion efficiency of calculating changes with crystal temperature effect, for sake of convenience, supposes that two blocks of nonlinear crystals are all placed over against laser here, so its optimum phase matching temperature is 150 ℃.Open basic frequency laser, measure when basic frequency laser is opened, it is 1 ℃ that the maximum temperature of crystal rises and falls.It is 149 ℃ and 151 ℃ with the Temperature Setting of two crystal in front and back respectively, as shown in 2 of A1 in figure and B1.When opening basic frequency laser more later on, crystal 2 makes its temperature more depart from its optimum phase matching temperature because temperature raises, to the B2 point, and its conversion efficiency decline Lb.But at this moment, crystal 1 makes its temperature more near the optimum phase matching temperature because temperature raises, to the A2 point, and its conversion efficiency rising La.Above-mentioned mechanism makes the conversion efficiency of two crystal realize compensation, realizes that finally overall conversion efficiency keeps constant substantially.Although the Temperature Setting of two crystal can be reduced its overall conversion efficiency for departing from its optimum phase matching temperature, this can compensate by adding the logical light size of long crystal.In addition, described in list of references, utilize two optical crystals, take optical direction as axis of symmetry, be mutually 180 ° of placements, also be conducive to laser in compensating non-linear optical frequency variable process walk from.
Claims (7)
1. the anti-temperature shock nonlinear optical frequency conversion implementation method of opening the light, relate to the basic frequency laser device
(1), nonlinear optical crystal (2,3) and temperature control system (7,8), it is characterized in that comprising the steps:
1. according to the specific requirement of the nonlinear optical frequency conversion that will carry out, design and process two blocks of nonlinear optical crystals (2,3);
Two blocks of nonlinear optical crystals (2,3) that 2. will process are placed in respectively in two cover materials and measure-alike temperature control system (7,8), and have kept crystal to contact with the intact of temperature control system;
3. according to the size of basic frequency laser power, be determined by experiment the maximum relief volume of caused nonlinear optical crystal temperature in basic frequency laser device (1) opening procedure;
4. the system that two covers is comprised nonlinear optical crystal is positioned in laser optical path, regulates its temperature by temperature control system (7,8), finds respectively its optimum phase matching temperature;
5. set respectively the temperature of two cover temperature control systems (7,8), make its respectively greater than with less than separately optimum phase matching temperature, greater than with amount less than the optimum phase matching temperature, determined maximum temperature relief volume in being 3., thereby complete compensation, make the conversion efficiency of whole converter plant keep constant in the process that laser is opened.
2. the anti-temperature shock nonlinear optical frequency conversion implementation method of opening the light according to claim 1, is characterized in that, the basic frequency laser device that uses is all solid state laser.
3. the anti-temperature shock nonlinear optical frequency conversion implementation method of opening the light according to claim 1, is characterized in that the nonlinear optical frequency conversion method of using is the temperature phase matching.
4. the anti-temperature shock nonlinear optical frequency conversion implementation method of opening the light according to claim 1, is characterized in that, the temperature control system that uses, employing be pid control mode.
5. the anti-temperature shock nonlinear optical frequency conversion implementation method of opening the light according to claim 1, is characterized in that, can apply to the nonlinear optics frequency multiplication.
6. the anti-temperature shock nonlinear optical frequency conversion implementation method of opening the light according to claim 1, is characterized in that, can apply to nonlinear optics and frequency.
7. the anti-temperature shock nonlinear optical frequency conversion implementation method of opening the light according to claim 1, is characterized in that, can apply to the nonlinear optics difference frequency.
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| CN1395132A (en) * | 2002-06-21 | 2003-02-05 | 华东师范大学 | Non-linear frequency changeover crystal |
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