CN100341211C - Phase miss match compensation heater of high power internal cavity freguency multiplier laser and its method - Google Patents
Phase miss match compensation heater of high power internal cavity freguency multiplier laser and its method Download PDFInfo
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- CN100341211C CN100341211C CNB2005101225889A CN200510122588A CN100341211C CN 100341211 C CN100341211 C CN 100341211C CN B2005101225889 A CNB2005101225889 A CN B2005101225889A CN 200510122588 A CN200510122588 A CN 200510122588A CN 100341211 C CN100341211 C CN 100341211C
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Abstract
The present invention discloses a phase mismatch compensation heater of a frequency doubling laser with a high power inner cavity and a method, which belongs to the technique of a green light laser. The heater is formed by that a KTP frequency doubling crystal is placed at the inner part of an airtight metal box, a temperature sensor and a heating pipe are embedded, a semiconductor refrigerator is arranged on the bottom part, and a metal box is provided with a solid state relay of a controller box. The method process is that the temperature value of the border of the KTP crystal is set; when the temperature is low, the power of the heating pipe is increased, the voltage of the refrigerator is reduced, and the temperature approaches to a set value; when the temperature is high, the power of the heating pipe is reduced, the voltage of the refrigerator is enlarged, and the temperature approaches to the set value. In this way, the present invention assures that the border temperature of the KTP frequency doubling crystal is kept within a certain range of stabilized operation temperature in the dynamic balance process of continuous heating and refrigeration. The present invention has the advantages that the system temperature of the entire heater is easily controlled and is stable, the high-power green light laser of which the average output power is 110 W is designed by the present invention, and in addition, the instability of the high-power green light laser is smaller than 2 percent.
Description
Technical field
The present invention relates to a kind of phase miss match compensation heater of high power internal cavity freguency multiplier laser and method, belong to green laser technology.
Background technology
Laser diode-pumped high repetition frequency (1～50kHz), high-average power (＞20W), inner cavity frequency-doubling green glow solid state laser, because have efficient height, good beam quality, characteristics such as volume is little, the life-span is long, operating cost is low, in fields such as industrial processes, laser medicine, habitata, separated isotopes and scientific researches important use is arranged.
Employing is one of important channel of realizing high power green light output based on the acousto-optic Q modulation Nd:YAG inner cavity frequency-doubling technology of KTP nonlinear optical crystal.But reach under the infrared laser radiation of several hectowatts in the output average power, both can linear absorption infrared light and green glow power at crystals, also third-order non-linear effects such as non-linear absorption such as two photon absorption may take place, ktp crystal has absorbed laser power, can produce temperature gradient distribution in inside, thereby can aspect following two, limit conversion efficiency, one side is owing to the inhomogeneous skewness that causes the ktp crystal refractive index of Temperature Distribution, thereby the optimum phase matched environment of having destroyed crystal causes the shg efficiency of crystal to descend; On the other hand, the crystals non-uniform temperature causes refractive index meeting uneven distribution, thereby cause the generation of thermal stress, corresponding generation thermal lens is corresponding, can change the laserresonator parameter in inner cavity frequency-doubling, thereby cause the instability of laser power and the decline of shg efficiency.
Current, the phase compensation technology of frequency-doubling crystal has low temperature (4-10 ℃) cooling and changes the method for frequency-doubling crystal angle (promptly change infrared light and incide angle in the crystal) in the high power green light laser, the appearance of ' grey mark ' (the so-called grey mark refers in the ktp crystal because lattice defect and the breakoff phenomenon that produces at low temperatures) that but because the sub-cooled environment has reduced the damage threshold of ktp crystal, cause ktp crystal easily.In addition, though the angle that changes frequency-doubling crystal to a certain extent can the compensation of phase mismatch, but owing to changed the incident direction of infrared light, increased the loss of infrared light like this, reduced the power of green glow output, simultaneously because the refraction of crystal angle can cause green glow output the phenomenon of many hot spots to occur.And in all solid state green (light) laser of high power inner chamber, adopt the technology of phase mismatch compensating heater and method can overcome above shortcoming, adopt the relevant patent of this technical scheme and document also not to report at present.
Summary of the invention:
The object of the present invention is to provide a kind of phase miss match compensation heater of high power internal cavity freguency multiplier laser and method, adopting this device and method can make laser output average power is 110W, and unsteadiness is less than 2%, and repetition rate 1kHz～30kHz is adjustable.
The present invention is realized by following technical proposals, a kind of phase miss match compensation heater of high power internal cavity freguency multiplier laser.Its technical characterictic is, this heater comprises an airtight can 8, in metal case, place KTP frequency-doubling crystal 10, temperature sensor 9 and heating tube 12 are set the position respectively up and down with ktp crystal, in the can bottom semiconductor cooler 11 is set, temperature sensor 9 links to each other with system control unit 14 in the can, and heating tube 12 links to each other with solid-state relay 13, system control unit 14 links to each other with solid-state relay 13, and the 220V AC power links to each other with solid-state relay 13.
Above-mentioned airtight can is the red copper can.
Adopt above-mentioned heater to realize the method for high power inner cavity frequency multiplier phase mismatch compensation heating, it is characterized in that comprising following process: after the heating tube energising intensification of ktp crystal bottom reaches set point, by temperature sensor 9 the crystal boundaries temperature signal is passed to system control unit 14, system control unit is made judgement according to set point, when the ktp crystal boundary temperature is lower than set point, system control unit 14 sends commands for controlling solid-state relay 13, increase the power of heating tube 12, simultaneity factor reduces the voltage of semiconductor cooler 11, thereby the boundary temperature that makes ktp crystal is near set point; When the ktp crystal boundary temperature is higher than set point, by temperature sensor 9 the crystal boundaries temperature signal is passed to system control unit 14, system control unit 14 sends the commands for controlling solid-state relay, reduce the power of heating tube 12, increase the voltage of semiconductor cooler 11 simultaneously, thereby the boundary temperature that makes ktp crystal in the homeostasis process of continuous heating and cooling guarantees so that near set point the boundary temperature of KTP frequency-doubling crystal 10 remains in certain stabilized operating temperature scope.
The advantage of patent of the present invention is, whole heater system easy temperature control, stable, thereby the average output power that has improved green (light) laser is lower than 85W, output instability and the narrow shortcoming of range of application, and the average output power that adopts the present invention's design is 110W and unsteadiness less than 2% high power green light laser, can be widely used in fields such as industrial lasers Carving Machining, laser medicine, laser display, habitata and military electrooptical countermeasures.
Description of drawings
Fig. 1 is all solid state green (light) laser structural representation of high power inner cavity frequency-doubling.
Fig. 2 is the structural representation that adopts the KTP frequency-doubling crystal heater of the present invention's design among Fig. 1.
Among the figure: 1 is concave mirror; 2 is acoustooptic Q-switching; 3 is high-power semiconductor laser pumping assembly; 4 is harmonic reflection mirror; 5 for being provided with the KTP frequency-doubling crystal of heater; 6 is outgoing mirror; 7 is that (Φ 6.45 * 146mm) for the Nd:YAG rod; 8 is airtight can; 9 is temperature sensor; 10 is the KTP frequency-doubling crystal; 11 is semiconductor cooler; 12 is heating tube; 13 is solid-state relay; 14 is system control unit.
Embodiment:
Specific embodiments of the present invention is embodied in a kind of all solid state green (light) laser of high power inner cavity frequency-doubling as shown in Figure 1, for this laser provides a kind of phase mismatch compensating heater device and method, adopting this device can make laser output average power is 110W, unsteadiness is less than 2%, and repetition rate 1kHz～30kHz is adjustable.
Concrete technical scheme of the present invention is as follows: the frequency-doubling crystal of employing is the ktp crystal of II class phase matched, and phase matching angle is φ=24.7 ° and θ=90 °, and it is of a size of 6 * 6 * 9.2mm, the anti-reflection film of two sides plating 1064nm and 532nm; The KTP frequency-doubling crystal is positioned over the airtight can center that the red copper material is made, and can is of a size of 20 * 20 * 30mm; The 5mm place embeds temperature sensor above the KTP frequency-doubling crystal, and its model is pt100, and the slit is filled up to increase heat-transfer effect with heat-conducting silicone grease; The 5mm place embeds heating tube below the KTP frequency-doubling crystal, and heating tube is to be made around ceramic rod by the resistance wire of 100 Ω, and the slit is filled up to increase heat-transfer effect with heat-conducting silicone grease; Fixedly model is the semiconductor cooler of TEC1-7104 below the airtight can of red copper, combines closely with heat-conducting silicone grease between can and the semiconductor cooler, to increase heat conductivility; The two-way control thermostat of PXW model that system control unit adopts company of Fuji to produce; The pt100 temperature sensor is connected on the DC1 end of thermostat, semiconductor cooler is connected on the TEC end of thermostat, with heating tube and model is that the solid-state relay ac terminal serial connection of AC～DC10A is connected on the 220V alternating current, the dc terminal of solid-state relay is held with the DC2 of thermostat be connected.
Realize phase miss match compensation heater of high power internal cavity freguency multiplier laser according to technique scheme, place it between the harmonic reflection mirror and outgoing mirror of all solid state green (light) laser of high power inner cavity frequency-doubling, adjust the height of heater, make the centre-height of KTP frequency-doubling crystal consistent with laser optical axis; Connect the power supply of heater, the temperature initial value of thermostat is set, this moment, the ktp crystal boundary temperature was lower than set point, by temperature sensor pt100 KTP frequency-doubling crystal boundary temperature signal is passed to thermostat PXW, thermostat is made judgement according to set point, the control solid-state relay increases the power of heating tube, reduces the voltage of semiconductor cooler simultaneously, thereby the boundary temperature that makes ktp crystal is near set point; Laser is opened, increase pumping current, green glow output, this moment is because the KTP frequency-doubling crystal has absorbed infrared light and green glow, its boundary temperature can be higher than set point, by temperature sensor pt100 KTP frequency-doubling crystal boundary temperature signal is passed to thermostat PXW, thermostat is made judgement according to set point, the control solid-state relay reduces the power of heating tube, increase the voltage of semiconductor cooler simultaneously, thereby the boundary temperature that makes ktp crystal in the homeostasis process of continuous heating and cooling guarantees so that near set point the boundary temperature of KTP frequency-doubling crystal remains in certain stabilized operating temperature scope; Under the certain pump power of laser, adjust the desired temperature of thermostat, make green glow output maximum; At the LD pump power is 1000W, and the ktp crystal boundary temperature is set to 48.8 ℃, and temperature accuracy is ± 0.1 ℃, acousto-optic Q opens the light repetition rate when being 10.6KHz, has obtained the 532nm green glow output of 110W, and pulse duration is 110ns, worked 5 hours, unsteadiness is less than 2%.
The all solid state green (light) laser Zhong of Zai high power inner cavity frequency-doubling adopts phase miss match compensation heater of high power internal cavity freguency multiplier laser And method has the several You points Xia the Yi: 1, than Yu constant temperature control mode, adopt change crystal boundaries Wen degree can realize frequency multiplication The Yun Xu phase matched width that utensil You is wider; 2, the Wen degree of adjusting the KTP heater by precision can make and pass through ktp crystal First-harmonic Zai satisfy the phase matched condition in the large scale scope very much; 3, Xu Yao does not pass through to adopt the anglec of rotation of regulating ktp crystal Method compensate the phase mismatch that You Yu Wen degree rising Zao becomes, the ktp crystal that reduces that Zhe Yang can You Xiao tilts to 1064nm The loss that infrared light produces, thereby raising shg efficiency that can You Xiao; 4, adopt change crystal boundaries Wen degree compensation of phase mismatch Scheme, than Xiao, it is qualitative that You is beneficial to the Wen that improves laser instrument with the amplitude of variation of ktp crystal boundary temperature for the green glow power output.
Claims (3)
1, a kind of phase miss match compensation heater of high power internal cavity freguency multiplier laser, it is characterized in that, this heater comprises an airtight can (8), in metal case, place KTP frequency-doubling crystal (10), temperature sensor (9) and heating tube (12) are set the position respectively up and down in the KTP frequency-doubling crystal, in the can bottom semiconductor cooler (11) is set, temperature sensor (9) links to each other with system control unit (14) in the can, semiconductor cooler (11) links to each other with system control unit (14), heating tube (12) links to each other with solid-state relay (13) ac terminal in the can, and system control unit (14) links to each other with solid-state relay (13) dc terminal.
2, by the described phase miss match compensation heater of high power internal cavity freguency multiplier laser of claim 1, it is characterized in that airtight can is the red copper can.
3, the described heater of a kind of employing claim 1 is realized high power inner cavity frequency multiplier phase mismatch compensation heating means, it is characterized in that, comprise following process: when the heating tube energising of KTP frequency-doubling crystal (10) bottom heats up after the boundary temperature that makes the KTP frequency-doubling crystal reaches set point, by temperature sensor (9) KTP frequency-doubling crystal boundary temperature signal is passed to system control unit (14), system control unit (14) is made judgement according to set point, when KTP frequency-doubling crystal (10) when boundary temperature is lower than set point, system control unit (14) sends commands for controlling solid-state relay (13), increase the power of heating tube (12), reduce the voltage of semiconductor cooler (11) simultaneously, thereby the boundary temperature that makes KTP frequency-doubling crystal (10) is near set point; When the boundary temperature of KTP frequency-doubling crystal (10) is higher than set point, by temperature sensor (9) temperature signal is passed to system control unit (14), solid-state relay (13) reduces the power of heating tube (12), increase the voltage of semiconductor cooler (11) simultaneously, thereby the boundary temperature that makes KTP frequency-doubling crystal (10) is near set point, and the boundary temperature that so guarantees KTP frequency-doubling crystal (10) in the homeostasis process of continuous heating and cooling remains in the operating temperature range near set point.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101225889A CN100341211C (en) | 2005-12-22 | 2005-12-22 | Phase miss match compensation heater of high power internal cavity freguency multiplier laser and its method |
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| CNB2005101225889A CN100341211C (en) | 2005-12-22 | 2005-12-22 | Phase miss match compensation heater of high power internal cavity freguency multiplier laser and its method |
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| CN100341211C true CN100341211C (en) | 2007-10-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101918759A (en) * | 2008-01-18 | 2010-12-15 | 布利斯控股有限责任公司 | Laser landscape lighting apparatus |
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| EP2525497A1 (en) | 2011-05-18 | 2012-11-21 | Panasonic Corporation | Bit-interleaved coding and modulation (BICM) with quasi-cyclic LDPC codes |
| CN103124043A (en) * | 2011-11-18 | 2013-05-29 | 中国科学院理化技术研究所 | Device for improving stability of deep ultraviolet laser |
| CN104049035B (en) * | 2014-07-03 | 2017-01-11 | 中国工程物理研究院化工材料研究所 | Force and heat synchronous loading device for in-situ detection of scanning acoustic microscope |
| CN104701719B (en) * | 2015-03-13 | 2018-03-20 | 李斌 | A kind of passive Q-regulaitng laser and its laser generation method |
| CN111122471A (en) * | 2019-12-27 | 2020-05-08 | 湖南森尚仪器有限公司 | Laser receiver erection equipment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4019159A (en) * | 1975-10-14 | 1977-04-19 | Hughes Aircraft Company | Optical frequency doubler using electro-optic crystal with improved feedback control of crystal phase match |
| US5935467A (en) * | 1997-05-14 | 1999-08-10 | General Electric Company | Oven for heating a crystal for a laser frequency conversion |
| US6002697A (en) * | 1998-04-03 | 1999-12-14 | Lambda Physik Gmbh | Diode pumped laser with frequency conversion into UV and DUV range |
| CN2602516Y (en) * | 2002-12-16 | 2004-02-04 | 中国科学院光电技术研究所 | Power supply, refrigeration, heat emission, and temperature control system special for semiconductor laser |
| CN2729969Y (en) * | 2004-06-09 | 2005-09-28 | 天津大学 | High-power full solid green laser based on high-temp frequency multiplier |
-
2005
- 2005-12-22 CN CNB2005101225889A patent/CN100341211C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4019159A (en) * | 1975-10-14 | 1977-04-19 | Hughes Aircraft Company | Optical frequency doubler using electro-optic crystal with improved feedback control of crystal phase match |
| US5935467A (en) * | 1997-05-14 | 1999-08-10 | General Electric Company | Oven for heating a crystal for a laser frequency conversion |
| US6002697A (en) * | 1998-04-03 | 1999-12-14 | Lambda Physik Gmbh | Diode pumped laser with frequency conversion into UV and DUV range |
| CN2602516Y (en) * | 2002-12-16 | 2004-02-04 | 中国科学院光电技术研究所 | Power supply, refrigeration, heat emission, and temperature control system special for semiconductor laser |
| CN2729969Y (en) * | 2004-06-09 | 2005-09-28 | 天津大学 | High-power full solid green laser based on high-temp frequency multiplier |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101918759A (en) * | 2008-01-18 | 2010-12-15 | 布利斯控股有限责任公司 | Laser landscape lighting apparatus |
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| CN1794521A (en) | 2006-06-28 |
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