CN101916961B - Double-wavelength external cavity resonance laser frequency converting device with tunable wavelength - Google Patents
Double-wavelength external cavity resonance laser frequency converting device with tunable wavelength Download PDFInfo
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- CN101916961B CN101916961B CN2010102412046A CN201010241204A CN101916961B CN 101916961 B CN101916961 B CN 101916961B CN 2010102412046 A CN2010102412046 A CN 2010102412046A CN 201010241204 A CN201010241204 A CN 201010241204A CN 101916961 B CN101916961 B CN 101916961B
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Abstract
The invention relates to a laser frequency converting, scanning and locking technology, in particular to a double-wavelength external cavity resonance laser frequency converting device with a tunable wavelength, solving the problem that a device capable of scanning the output frequency of frequency converting laser obtained on the basis of a double-wavelength external cavity resonance technology is not proposed at present. The double-wavelength external cavity resonance laser frequency converting device with a tunable wavelength comprises a function generator, a first laser arranged at a signal output end of the function generator, a first matched lens, a first 1/2 wave plate, a second laser, a second matched lens, a second 1/2 wave plate, a non-linear crystal and a 8-shaped annular cavity. The invention solves the problem that a device capable of scanning the output frequency of frequency converting laser obtained based on the double-wavelength external cavity resonance technology is not proposed at present, and a method and the device of the invention are suitable for various converting processes of various frequency including sum frequency, frequency multiplication, difference frequency, and the like.
Description
Technical field
The present invention relates to laser frequency conversion, scanner uni lock-in techniques, specifically is a kind of dual wavelength external cavity resonance laser frequency converting device of tunable wave length.
Background technology
For the specific wavelength laser that is applied to special purpose, can obtain by dye laser, gas laser, but because the two system is too huge, and efficient is lower, costs an arm and a leg, and the life-span seldom is used than characteristics such as weak points.Semiconductor laser and fiber laser in the development of nearly decades because its structure and simple to operate and stable characteristics are applied to every field widely, but its output wavelength mainly is positioned at near-infrared or mid and far infrared wave band, seldom can realize the direct output of ultraviolet or visible light separately.Based on these two kinds of lasers, almost can obtain the laser of any wavelength from the ultraviolet to the near-infrared by the non-linear frequency switch technology.
Dual wavelength external cavity resonance technology is widely used in the non-linear frequency transfer process, it specifically is by nonlinear crystal being placed in the optics cavity, utilizing the light intensity of optics cavity to amplify and light beam optimization acquisition beam quality and the higher frequency inverted laser output of frequency conversion efficiency.Nonlinear crystal is the main devices of carrying out frequency inverted, and nonlinear crystal commonly used at present comprises KTP, BBO, LBO and periodical poled crystal such as PPLN, PPKTP etc.
To the tuning of optical maser wavelength is a critical function of laser application, because its wavelength can change continuously, can be applied to spectroscopy, gaseous contamination detection, information processing widely and communicate by letter and field such as medical science detection.After the output of dual wavelength external cavity resonance technology acquisition frequency inverted laser, need the output frequency of frequency inverted laser be scanned, yet still do not have at present a kind of device that can scan the output frequency of the frequency inverted laser that obtains based on dual wavelength external cavity resonance technology.
Summary of the invention
The present invention provides a kind of dual wavelength external cavity resonance laser frequency converting device of tunable wave length in order to solve the problem of still not having at present a kind of device that can scan the output frequency of the frequency inverted laser that obtains based on dual wavelength external cavity resonance technology.
The present invention adopts following technical scheme to realize: the dual wavelength external cavity resonance laser frequency converting device of tunable wave length comprises function generator, is positioned at first laser, first matched lenses, the 1/1st wave plate, second laser, second matched lenses, the 1/2nd wave plate, nonlinear crystal and " 8 " word annular chamber of function generator signal output part; Described " 8 " word annular chamber comprises the first chamber mirror, the second chamber mirror, the 3rd chamber mirror, the 4th chamber mirror, piezoelectric ceramic; Wherein, the first chamber mirror, the second chamber mirror are located along the same line; The 3rd chamber mirror, the 4th chamber mirror, nonlinear crystal are located along the same line; Piezoelectric ceramic is fixed in the second chamber mirror outer surface; The reflection end of the first chamber mirror is provided with a HC frequency locking system; A described HC frequency locking system comprises first quarter-wave plate, first polarization beam splitter prism, first photodetector, second photodetector, first subtracter; Wherein, first quarter-wave plate is positioned at the reflection end of the first chamber mirror, first polarization beam splitter prism is positioned at the transmission end of first quarter-wave plate, first photodetector, second photodetector lay respectively at two outputs of first polarization beam splitter prism, and two inputs of first subtracter connect the output of first photodetector and the output of second photodetector respectively; The reflection end of the 3rd chamber mirror is provided with the 2nd HC frequency locking system; Described the 2nd HC frequency locking system comprises second quarter-wave plate, second polarization beam splitter prism, the 3rd photodetector, the 4th photodetector, second subtracter; Wherein, second quarter-wave plate is positioned at the reflection end of the 3rd chamber mirror, second polarization beam splitter prism is positioned at the transmission end of second quarter-wave plate, the 3rd photodetector, the 4th photodetector lay respectively at two outputs of second polarization beam splitter prism, and two inputs of second subtracter connect the output of the 3rd photodetector and the output of the 4th photodetector respectively; The output of first subtracter is connected with first electronic servo, and the output of first electronic servo links to each other with the input of piezoelectric ceramic; The output of second subtracter is connected with second electronic servo, and the output of second electronic servo links to each other with the modulation port of second laser; The transmission end of the 4th chamber mirror is provided with the first confocal FP chamber, and the exit end of first laser is provided with partially reflecting mirror, and the transmission end of partially reflecting mirror is provided with the second confocal FP chamber.
During work, the laser of first laser emitting is coupled in " 8 " word annular chamber after by first matched lenses, the 1/1st wave plate, it is successively turned back to the first chamber mirror week through advancing behind the second chamber mirror, the 3rd chamber mirror, the 4th chamber mirror and is overlapped with incident beam by the first chamber mirror incident.The first chamber mirror has certain transmissivity to laser, " 8 " word annular chamber by the light beam of the first chamber mirroring by one or the four/wave plate and first polarization beam splitter prism after, detected by first photodetector and second photodetector, two photodetectors are converted into the signal of telecommunication with light intensity and import first subtracter, the error signal that produces feeds back to piezoelectric ceramic by first electronic servo, piezoelectric ceramic stretches long to regulate the annular chamber chamber according to error signal, make the eigen mode frequency of " 8 " word annular chamber consistent with the output frequency of first laser.The laser of second laser emitting is equally through being coupled to behind second matched lenses, the 1/2nd wave plate in " 8 " word annular chamber, it is successively turned back to the 3rd chamber mirror a week through advancing behind the 4th chamber mirror, the first chamber mirror, the second chamber mirror and is overlapped with incident beam by the 3rd chamber mirror incident.The 3rd chamber mirror has certain transmissivity to the laser of second laser emitting, " 8 " word annular chamber by the light beam of the 3rd chamber mirroring by two or the four/wave plate and second polarization beam splitter prism after, detected by the 3rd photodetector and the 4th photodetector, two photodetectors are converted into the signal of telecommunication with light intensity and import second subtracter, the error signal that produces is fed back to the resonant cavity of second laser by second electronic servo, change the output frequency of second laser and make it and chamber resonance with this, formed the cascade locking between the output frequency of the output frequency of first laser and second laser thus.When two bundle laser in " 8 " word annular chamber when coincidence and crystal design and temperature control guarantee best phase matched fully, the laser of the laser of first laser emitting and second laser emitting can produce frequency inverted laser through nonlinear optics frequency inverted effect in nonlinear crystal.Corresponding relation according to laser frequency and " 8 " word annular chamber chamber between long and frequency inverted formula are as can be known, if change the output frequency of first laser, the annular chamber chamber is long can be changed thereupon, the output frequency of second laser also can change with the long variation in chamber, therefore the frequency inverted laser frequency that obtains also can change, thereby realizes the tunable output of frequency inverted laser.Form the cascade locking by " 8 " word annular chamber between the output frequency of the output frequency of first laser and second laser, after the output of nonlinear crystal acquisition frequency inverted laser, produce the modulation port that a triangular voltage sweep signal is input to first laser by function generator, realize scanning to the output frequency of first laser with this, the scope of its frequency scanning records by the second confocal FP chamber; Simultaneously, the frequency of frequency inverted laser will scan along with the output frequency of first laser, and the scope of its frequency scanning records by the first confocal FP chamber.
Nonlinear crystal is the main devices of carrying out frequency inverted, and nonlinear crystal commonly used at present comprises KTP, BBO, LBO and periodical poled crystal such as PPLN, PPKTP etc.In frequency conversion, can adopt I class temperature coupling or II class angle to mate and realize accurate phase matched.In addition, the present invention not only can be based on HC(Hansch-Couillaud) the frequency locking technology realizes, equally also can be based on PDH(Pound-Drever-Hall) etc. the frequency locking technology realize.
The invention solves the problem of still not having at present a kind of device that can scan the output frequency of the frequency inverted laser that obtains based on dual wavelength external cavity resonance technology, its method and device are applicable to and various frequency conversion such as frequency, frequency multiplication, difference frequency.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is of the present invention and the graph of a relation of the frequency scanning output of frequency light and semiconductor laser.
Among Fig. 1: 1-function generator, 2-first laser, 3-first matched lenses, 4-the 1/1st wave plate, 5-second laser, 6-second matched lenses, 7-the 1/2nd wave plate, the 8-first chamber mirror, the 9-second chamber mirror, 10-the 3rd chamber mirror, 11-the 4th chamber mirror, 12-piezoelectric ceramic, 13-first quarter-wave plate, 14-first polarization beam splitter prism, 15-first photodetector, 16-second photodetector, 17-first subtracter, 18-first electronic servo, 19-second quarter-wave plate, 20-second polarization beam splitter prism, 21-the 3rd photodetector, 22-the 4th photodetector, 23-second subtracter, 24-second electronic servo, the 25-nonlinear crystal, the 26-first confocal FP chamber, the 27-second confocal FP chamber, 28-partially reflecting mirror.
Among Fig. 2: (a) the scanning voltage signal of exporting for function generator; (b) be the frequency scanning output of the 938nnm semiconductor laser that records of the second confocal FP chamber; (c) 589nm that records of the first confocal FP chamber and the output of light frequency scanning frequently.
Embodiment
The dual wavelength external cavity resonance laser frequency converting device of tunable wave length comprises function generator 1, is positioned at first laser 2, first matched lenses 3, the 1/1st wave plate 4, second laser 5, second matched lenses 6, the 1/2nd wave plate 7, nonlinear crystal 25 and " 8 " word annular chamber of function generator 1 signal output part; Described " 8 " word annular chamber comprises the first chamber mirror 8, the second chamber mirror 9, the 3rd chamber mirror 10, the 4th chamber mirror 11, piezoelectric ceramic 12; Wherein, the first chamber mirror 8, the second chamber mirror 9 are located along the same line; The 3rd chamber mirror 10, the 4th chamber mirror 11, nonlinear crystal 25 are located along the same line; Piezoelectric ceramic 12 is fixed in the second chamber mirror, 9 outer surfaces;
The reflection end of the first chamber mirror 8 is provided with a HC frequency locking system; A described HC frequency locking system comprises first quarter-wave plate 13, first polarization beam splitter prism 14, first photodetector 15, second photodetector 16, first subtracter 17; Wherein, first quarter-wave plate 13 is positioned at the reflection end of the first chamber mirror 8, first polarization beam splitter prism 14 is positioned at the transmission end of first quarter-wave plate 13, first photodetector 15, second photodetector 16 lay respectively at two outputs of first polarization beam splitter prism 14, and two inputs of first subtracter 17 connect the output of first photodetector 15 and the output of second photodetector 16 respectively;
The reflection end of the 3rd chamber mirror 10 is provided with the 2nd HC frequency locking system; Described the 2nd HC frequency locking system comprises second quarter-wave plate 19, second polarization beam splitter prism 20, the 3rd photodetector 21, the 4th photodetector 22, second subtracter 23; Wherein, second quarter-wave plate 19 is positioned at the reflection end of the 3rd chamber mirror 10, second polarization beam splitter prism 20 is positioned at the transmission end of second quarter-wave plate 19, the 3rd photodetector 21, the 4th photodetector 22 lay respectively at two outputs of second polarization beam splitter prism 20, and two inputs of second subtracter 23 connect the output of the 3rd photodetector 21 and the output of the 4th photodetector 22 respectively;
The output that the output of first subtracter 17 is connected with first electronic servo, 18, the first electronic servos 18 links to each other with the input of piezoelectric ceramic 12; The output that the output of second subtracter 23 is connected with second electronic servo, 24, the second electronic servos 24 links to each other with the modulation port of second laser 5;
The exit end that the transmission end of the 4th chamber mirror 11 is provided with the first confocal FP chamber, 26, the first lasers 2 is provided with partially reflecting mirror 28, and the transmission end of partially reflecting mirror 28 is provided with the second confocal FP chamber 27.
During concrete enforcement, with the frequency process be example, first laser 2 is the 938nm semiconductor laser, second laser 5 is the 1583nm fiber laser, nonlinear crystal 25 is the LLPN crystal.Based on dual wavelength external cavity resonance technology, obtain exporting of 589nm with frequency light by the LLPN crystal.As shown in Figure 2, (a) be the scanning voltage signal of function generator output, scanning frequency is 1Hz, and sweep amplitude is 5V; (b) be the frequency scanning output of the 938nnm semiconductor laser that records of the second confocal FP chamber, its sweep limits is about 319MHZ; (c) be 589nm and the output of light frequency scanning frequently that the first confocal FP chamber records, its sweep limits is about 509MHZ.Here the scanning frequency of Cai Yonging all is 1Hz, because the restriction of frequency lock bandwidth, and after increasing scanning frequency, the losing lock very easily because the frequency locking loop does not have enough big gain.Frequency is more little, and its sweep limits is big more, under the scanning frequency of 1Hz, to the sweep limits of frequency light greater than 1.5GHz.
Claims (1)
1. the dual wavelength external cavity resonance laser frequency converting device of a tunable wave length is characterized in that: comprise function generator (1), be positioned at first laser (2), first matched lenses (3), the 1/1st wave plate (4), second laser (5), second matched lenses (6), the 1/2nd wave plate (7), nonlinear crystal (25) and " 8 " word annular chamber of function generator (1) signal output part; Described " 8 " word annular chamber comprises the first chamber mirror (8), the second chamber mirror (9), the 3rd chamber mirror (10), the 4th chamber mirror (11), piezoelectric ceramic (12); Wherein, the first chamber mirror (8), the second chamber mirror (9) are located along the same line; The 3rd chamber mirror (10), the 4th chamber mirror (11), nonlinear crystal (25) are located along the same line; Piezoelectric ceramic (12) is fixed in second chamber mirror (9) outer surface;
The reflection end of the first chamber mirror (8) is provided with a Hansch-Couillaud frequency locking system; A described Hansch-Couillaud frequency locking system comprises first quarter-wave plate (13), first polarization beam splitter prism (14), first photodetector (15), second photodetector (16), first subtracter (17); Wherein, first quarter-wave plate (13) is positioned at the reflection end of the first chamber mirror (8), first polarization beam splitter prism (14) is positioned at the transmission end of first quarter-wave plate (13), first photodetector (15), second photodetector (16) lay respectively at two outputs of first polarization beam splitter prism (14), and two inputs of first subtracter (17) connect the output of first photodetector (15) and the output of second photodetector (16) respectively;
The reflection end of the 3rd chamber mirror (10) is provided with the 2nd Hansch-Couillaud frequency locking system; Described the 2nd Hansch-Couillaud frequency locking system comprises second quarter-wave plate (19), second polarization beam splitter prism (20), the 3rd photodetector (21), the 4th photodetector (22), second subtracter (23); Wherein, second quarter-wave plate (19) is positioned at the reflection end of the 3rd chamber mirror (10), second polarization beam splitter prism (20) is positioned at the transmission end of second quarter-wave plate (19), the 3rd photodetector (21), the 4th photodetector (22) lay respectively at two outputs of second polarization beam splitter prism (20), and two inputs of second subtracter (23) connect the output of the 3rd photodetector (21) and the output of the 4th photodetector (22) respectively;
The output of first subtracter (17) is connected with first electronic servo (18), and the output of first electronic servo (18) links to each other with the input of piezoelectric ceramic (12); The output of second subtracter (23) is connected with second electronic servo (24), and the output of second electronic servo (24) links to each other with the modulation port of second laser (5);
The transmission end of the 4th chamber mirror (11) is provided with the first confocal FP chamber (26), and the exit end of first laser (2) is provided with partially reflecting mirror (28), and the transmission end of partially reflecting mirror (28) is provided with the second confocal FP chamber (27).
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| CN108023264A (en) * | 2017-12-05 | 2018-05-11 | 中国科学技术大学 | A kind of large angle incidence degeneracy optical resonator |
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| CN108336632B (en) * | 2017-01-18 | 2020-03-06 | 中国科学院理化技术研究所 | Cavity mirror crystal integrated ultrastable cavity device and method |
| CN106842761B (en) * | 2017-03-15 | 2019-05-17 | 中国科学院上海光学精密机械研究所 | Optics cavity automatic locking apparatus and its lock cavity method based on analog circuit |
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| US6876689B2 (en) * | 2001-06-07 | 2005-04-05 | Light Age, Inc. | Narrow spectral bandwidth tunable pulsed solid-state laser system |
| WO2004070893A2 (en) * | 2003-02-05 | 2004-08-19 | Gws-Photonics Ltd. | External cavity tunable laser and control |
| JP4596181B2 (en) * | 2007-03-28 | 2010-12-08 | 日本電気株式会社 | External cavity tunable semiconductor laser |
| CN101598794A (en) * | 2009-07-06 | 2009-12-09 | 北京航空航天大学 | Twin-laser frequency scanning interference method high precision absolute distance measurement instrument |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108023264A (en) * | 2017-12-05 | 2018-05-11 | 中国科学技术大学 | A kind of large angle incidence degeneracy optical resonator |
| CN108023264B (en) * | 2017-12-05 | 2019-07-23 | 中国科学技术大学 | A kind of large angle incidence degeneracy optical resonator |
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