CN102889929A - Method for calibrating wavelength of ultraviolet spectrograph - Google Patents
Method for calibrating wavelength of ultraviolet spectrograph Download PDFInfo
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- CN102889929A CN102889929A CN2012102520054A CN201210252005A CN102889929A CN 102889929 A CN102889929 A CN 102889929A CN 2012102520054 A CN2012102520054 A CN 2012102520054A CN 201210252005 A CN201210252005 A CN 201210252005A CN 102889929 A CN102889929 A CN 102889929A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000006641 stabilisation Effects 0.000 claims abstract description 22
- 238000011105 stabilization Methods 0.000 claims abstract description 22
- 230000008569 process Effects 0.000 claims abstract description 5
- 230000003595 spectral effect Effects 0.000 claims description 10
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000001228 spectrum Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910052740 iodine Inorganic materials 0.000 description 3
- 239000011630 iodine Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 3
- 229910052753 mercury Inorganic materials 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 230000004304 visual acuity Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910017502 Nd:YVO4 Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000002211 ultraviolet spectrum Methods 0.000 description 1
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Abstract
The invention provides a method for calibrating the wavelength of an ultraviolet spectrograph. A 532 nanometer base frequency laser device, a frequency stabilization system, a frequency doubling system and a servo control system are mainly used in the method. The whole working process of a device comprises that the laser of the 532 nanometer base frequency laser device is divided into two channels through a light splitting element; one channel of the laser of the 532 nanometer base frequency laser device passes through the frequency stabilization system; the frequency stabilization system provides a stable reference frequency; if the frequency of base frequency laser deviates from the reference frequency, the frequency stabilization system can produce a feedback signal; the feedback signal passes through the servo control system, the cavity length of the base frequency laser device is adjusted, a 532 nanometer base light frequency is ensured to be always equal to the reference frequency provided by the frequency stabilization device, and the stability of a 532 nanometer laser frequency is guaranteed; the other channel of the laser of the 532 nanometer base frequency laser device passes through the frequency doubling system, so that 266 nanometer ultraviolet laser is generated; because the 532 nanometer light base frequency is stable, the frequency of 266 nanometer frequency doubled laser is also kept stable; after passing through an optically coupled system, the 266 nanometer ultraviolet laser enters the ultraviolet spectrograph, and then the ultraviolet spectrograph is calibrated.
Description
Technical field
The present invention relates to a kind of method for wavelength calibration, especially a kind of ultraviolet spectrometer (UVS) method for wavelength calibration.
Background technology
In the magnitude tracing system of spectrum, the optical wavelength of visible light and near-infrared band can be traceable to atomic frequency standard, but also is in conceptual phase at ultraviolet band.Present stage is adopted the calibration steps of atomic spectral line lamp in the world mostly for the ultraviolet wavelength calibration, concrete technical scheme is: the spectrum standard lamp is lighted under rated current (or voltage), at the appointed time preheating, then the radiant light with standard lamp is coupled to ultraviolet spectrometer (UVS), recording light spectrometer wavelength indicating value, and compare with the standard value of spectrum standard lamp.Because the spectral line energy of low pressure mercury lamp is too little, also can't realize magnitude tracing, the standard value of low pressure mercury lamp is generally manufacturer's value of providing, or the default value of research and production.
Along with the development of photoelectron technology, ultraviolet technology application militarily is more and more extensive, and the application of ultraviolet spectrometer (UVS) also increases thereupon.Wavelength accuracy is one of major parameter of examination ultraviolet spectrometer (UVS) performance, and present stage mainly adopts the characteristic spectral line of atomic spectral line lamp (low pressure mercury lamp, hollow cathode lamp etc.) to calibrate the ultraviolet spectrometer (UVS) wavelength, and the shortcoming that the method exists mainly contains:
(1) live width of atomic spectral line lamp is wider, can not satisfy the alignment requirements of high resolving power ultraviolet spectrum analyzer.Such as a ultraviolet spectrometer (UVS) of marine optics, resolution is better than 0.01nm, and spectrometer relies on the calibration of wavelength lamp, and the spectrum accuracy only has 0.5nm, far below spectral resolution.
(2) characteristic spectral line of atomic spectral line lamp is vulnerable to the impact of the factors such as pressure, temperature in the lamp, causes calibration result to produce larger uncertainty.
(3) manufacturer of a lot of production spectrum standard lamps is arranged on the market, but they do not have unified production standard, cause the spectrum standard lamp produced to have in various degree difference, calibrate ultraviolet spectrometer (UVS) with this class standard lamp and can not guarantee accuracy, can not solve the problem of tracing to the source of wavelength calibration.
For the problem that present ultraviolet spectrometer (UVS) method for wavelength calibration exists, the present invention utilizes 532nm laser to obtain 266nm laser by frequency multiplication, and the narrow linewidth characteristic of laser can satisfy the wavelength calibration requirement of high resolving power ultraviolet spectrometer (UVS); In order to guarantee the wavelength source output wavelength accurately and stable, the present invention has carried out the frequency stabilization processing to the fundamental frequency light of 532nm, with its frequency stabilization on the characteristic spectral line of iodine molecule, thereby guaranteed the stability of 266nm wavelength.
Experiment shows that stable performance of the present invention, accuracy are high, can effectively solve the existing variety of issue of prior art, has highly application value.
Summary of the invention
For above-mentioned shortcoming, the present invention sets up a cover ultraviolet standard wavelength source, and stable output wavelength and the accuracy of this wavelength source are high, and can be traceable to natural reference and national standard, thereby effectively solve the problem that existing ultraviolet spectrometer (UVS) method for wavelength calibration exists.
One of purpose of the present invention is achieved through the following technical solutions:
The present invention is mainly by 532nm basic frequency laser device, frequency stabilization system, frequency doubling system and servo-control system form, the course of work of whole device is: the basic frequency laser device of 532nm is divided into two-way by beam splitter, lead up to frequency regulator, frequency regulator provides the reference frequency of a frequency stabilization, if the frequency departure reference frequency of basic frequency laser, frequency regulator can produce feedback signal, this signal passes through servo-control system, the chamber of regulating the basic frequency laser device is long, the fundamental frequency light frequency that guarantees 532nm is stabilized on the reference frequency that frequency regulator provides, and guarantees laser frequency stable of 532nm; Another road produces the Ultra-Violet Laser of 266nm by frequency doubling device, because 532nm fundamental frequency light frequency is stable, then the frequency of the double-frequency laser of 266nm also can keep stable, after optically coupled system, enters ultraviolet spectrometer (UVS), carries out the ultraviolet spectrometer (UVS) calibration.Simultaneously, device can produce 1064nm, 532nm and the 266nm laser with strict multiple relation, can calibrate the wavelength linear of grating type spectrometer.
The present invention has the following advantages:
(1) wavelength accuracy is high, can satisfy the wavelength calibration requirement of high resolving power ultraviolet spectrometer (UVS).
(2) have frequency stabilization system, can guarantee the stability of output wavelength.
(3) have the wavelength traceability, wavelength can be traceable to natural reference and national standard.
(4) can produce the laser with strict multiple relation, the wavelength linear of ultraviolet spectrometer (UVS) is calibrated.
Description of drawings
Below in conjunction with accompanying drawing specific embodiments of the invention are described in further detail.
Figure 126 6nm standard wavelength produces schematic flow sheet
Figure 25 32nm, 1064nm laser produce schematic flow sheet
Fig. 3 iodine molecule absorbs frequency stabilization principle process schematic diagram
Fig. 4 annular frequency doubling cavity principle process schematic diagram
Embodiment
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail; Should be appreciated that preferred embodiment only for the present invention is described, rather than in order to limit protection scope of the present invention.
The present invention mainly is comprised of 532nm basic frequency laser device, frequency stabilization system, frequency doubling system and servo-control system, and the course of work of whole device is:
Fig. 1 is that 266nm standard wavelength produces schematic diagram, the basic frequency laser device of 532nm is by the beam splitter light splitting, a branch of frequency regulator that passes through, frequency regulator provides the reference frequency of a frequency stabilization, if the frequency departure reference frequency of basic frequency laser, frequency regulator can produce feedback signal, this signal passes through servo-control system, the chamber of regulating the basic frequency laser device is long, and the fundamental frequency light frequency of 532nm is stabilized on the reference frequency that frequency regulator provides, and guarantees the stablizing of laser frequency of 532nm; Another road produces the Ultra-Violet Laser of 266nm by frequency doubling device, because 532nm fundamental frequency light frequency is stable, then the frequency of the double-frequency laser of 266nm also can keep stable, after optically coupled system, enter ultraviolet spectrometer (UVS), carry out the research of ultraviolet spectrometer (UVS) collimation technique.
Fig. 2 is that the 532nm tunable laser produces schematic diagram, and the semiconductor laser of 808nm encourages bonding Nd:YVO4 crystal as pump light source, produces the near infrared light of 1064nm, and the near infrared light of 1064nm produces the visible light of 532nm by frequency-doubling crystal.After 532nm laser absorbed frequency stabilization by iodine molecule, 1064nm laser can be realized frequency stabilization output simultaneously.
Fig. 3 is that iodine molecule absorbs the frequency stabilization principle schematic, the light of laser instrument output is divided into the orthogonal two-beam in polarization direction through polarization beam splitter prism, wherein a branch of process electrooptic modulator is modulated light, another bundle light is modulated, two-beam oppositely enters the iodine chamber, keeps the iodine room temperature stable by temperature regulating device, in the iodine chamber, two-beam produces non-linear four-wave mixing, realizes that sideband is by the transfer of modulated beam of light to unmodulated light beam.Unmodulated light beam and the new sideband that produces import photoelectricity differential detector (DET) through polarization beam splitter prism, by the double balanced mixer demodulation, obtain outer differential spectra as the control frequency discrimination signal of laser frequency stabilization, differential signal advances the piezoelectric ceramics on the oversampling circuit system control laser cavity, change the chamber long, thereby the frequency stabilization that makes laser instrument is on reference frequency.
Fig. 4 is annular frequency doubling cavity principle schematic, and the fundamental frequency polarized light converts linearly polarized light to through λ/4 slides and λ/2 slides, realizes polarized matching, and lens couple light to fundamental frequency in the cavity, the implementation space pattern match.Ring cavity by level crossing M1, M2 and concave mirror M3, M4 form, wherein M1 is coupling mirror, is used for realizing outside the fundamental frequency chamber and the coupling of chamber inner light beam, its transmitance satisfies the frequency multiplication requirement through special selection.Mirror M 2, M3, M4 have high reflectance to fundamental frequency light, and wherein M4 has high permeability to frequency doubled light simultaneously, to realize the extraction of second harmonic.Detector 1 among the figure and 2 is used for monitoring the imbalance between double-frequency laser wavelength and the harmonic resonance ripple.During imbalance, can produce error signal, this signal is through feedback system, feed back to piezoelectric ceramic actuator, long by the telescopic adjustment chamber of piezoelectric ceramics, realize tracking and locking between frequency doubling cavity and the laser instrument, luminous power produces larger double frequency power owing to resonance effect obtains to strengthen in the chamber.
Claims (6)
1. ultraviolet spectrometer (UVS) method for wavelength calibration, it is characterized in that: the method comprises 532nm basic frequency laser device, frequency stabilization system, frequency doubling system and servo-control system.
2. ultraviolet spectrometer (UVS) method for wavelength calibration as claimed in claim 1, it is characterized in that: utilize 532nm laser by outside annular frequency doubling cavity, frequency multiplication obtains 266nm laser, and the fundamental frequency light of 532nm is carried out frequency stabilization process, with its frequency stabilization on the characteristic spectral line of iodine molecule, the laser of 266nm frequency multiplication enters ultraviolet spectrometer (UVS) by after the optically coupled system, carries out the ultraviolet spectrometer (UVS) calibration.
3. ultraviolet spectrometer (UVS) method for wavelength calibration as claimed in claim 1 or 2, it is characterized in that: the basic frequency laser device of 532nm is divided into two-way by beam splitter, lead up to frequency regulator, frequency regulator provides the reference frequency of a frequency stabilization, the fundamental frequency light frequency that guarantees 532nm is stabilized on the reference frequency that frequency regulator provides, and guarantees laser frequency stable of 532nm; Another road produces the Ultra-Violet Laser of 266nm by frequency doubling device, because 532nm fundamental frequency light frequency is stable, then the frequency of the double-frequency laser of 266nm also can keep stable, after optically coupled system, enters ultraviolet spectrometer (UVS), carries out the ultraviolet spectrometer (UVS) calibration.
4. ultraviolet spectrometer (UVS) method for wavelength calibration as claimed in claim 3 is characterized in that: the frequency departure reference frequency of basic frequency laser, and frequency regulator can produce feedback signal, and this signal is by servo-control system, and the chamber of regulating the basic frequency laser device is long.
5. ultraviolet spectrometer (UVS) method for wavelength calibration as claimed in claim 1 is characterized in that: device can produce 1064nm, 532nm and the 266nm Frequency Stabilized Lasers with strict multiple relation simultaneously, and the wavelength linear of grating type spectrometer is calibrated.
6. ultraviolet spectrometer (UVS) wavelength linear calibration steps as claimed in claim 5, it is characterized in that: at first utilize 266nm laser that ultraviolet spectrometer (UVS) is carried out compensation for calibrating errors, then utilize the wavelength of ultraviolet spectrometer (UVS) test 532nm, 1064nm laser, carry out the ultraviolet spectrometer (UVS) linear gauging.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326227A (en) * | 2013-05-20 | 2013-09-25 | 中国电子科技集团公司第四十一研究所 | 266nm ultraviolet laser generator |
| CN103606814A (en) * | 2013-11-13 | 2014-02-26 | 中国电子科技集团公司第四十一研究所 | Laser frequency stabilization realization method |
| CN104135319A (en) * | 2014-07-28 | 2014-11-05 | 中国电子科技集团公司第四十一研究所 | Method of testing rejection ratio of visible light of ultraviolet communication transmitter |
| CN104410445A (en) * | 2014-10-16 | 2015-03-11 | 北京理工大学 | Calibration device and method of optical transmitter modulation measurement equipment |
| CN104864897A (en) * | 2015-05-07 | 2015-08-26 | 深圳市清时捷科技有限公司 | Zero adjusting system and method |
| CN106018363A (en) * | 2016-05-17 | 2016-10-12 | 中国科学院合肥物质科学研究院 | Wavelength correction control system for dye laser |
| CN106092337A (en) * | 2016-05-18 | 2016-11-09 | 中国电子科技集团公司第四十研究所 | The calibrating installation of a kind of ultraviolet wavelength measuring instrument and method |
| CN107658690A (en) * | 2017-09-08 | 2018-02-02 | 中国科学院上海光学精密机械研究所 | Based on frequency and the 1572nm frequency stabilization systems and method of Modulation Transfer Spectroscopy |
| CN107907067A (en) * | 2017-11-24 | 2018-04-13 | 天津大学 | A kind of fiber grating Bragg resonance wavelength based on periodic modulation determines method |
| CN112577942A (en) * | 2020-11-20 | 2021-03-30 | 重庆大学 | Same-core diatomic gas detection method and system based on photoacoustic stimulated Raman effect |
| CN113543451A (en) * | 2020-04-13 | 2021-10-22 | 中国科学院上海光学精密机械研究所 | Double-beam laser driving ion accelerating device |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326227A (en) * | 2013-05-20 | 2013-09-25 | 中国电子科技集团公司第四十一研究所 | 266nm ultraviolet laser generator |
| CN103326227B (en) * | 2013-05-20 | 2016-03-02 | 中国电子科技集团公司第四十一研究所 | A kind of 266nm uv laser generator |
| CN103606814A (en) * | 2013-11-13 | 2014-02-26 | 中国电子科技集团公司第四十一研究所 | Laser frequency stabilization realization method |
| CN104135319A (en) * | 2014-07-28 | 2014-11-05 | 中国电子科技集团公司第四十一研究所 | Method of testing rejection ratio of visible light of ultraviolet communication transmitter |
| CN104410445B (en) * | 2014-10-16 | 2017-05-17 | 北京理工大学 | Calibration device and method of optical transmitter modulation measurement equipment |
| CN104410445A (en) * | 2014-10-16 | 2015-03-11 | 北京理工大学 | Calibration device and method of optical transmitter modulation measurement equipment |
| CN104864897A (en) * | 2015-05-07 | 2015-08-26 | 深圳市清时捷科技有限公司 | Zero adjusting system and method |
| CN106018363A (en) * | 2016-05-17 | 2016-10-12 | 中国科学院合肥物质科学研究院 | Wavelength correction control system for dye laser |
| CN106018363B (en) * | 2016-05-17 | 2018-10-16 | 中国科学院合肥物质科学研究院 | A kind of wavelength Correction and Control system for dye laser |
| CN106092337A (en) * | 2016-05-18 | 2016-11-09 | 中国电子科技集团公司第四十研究所 | The calibrating installation of a kind of ultraviolet wavelength measuring instrument and method |
| CN107658690A (en) * | 2017-09-08 | 2018-02-02 | 中国科学院上海光学精密机械研究所 | Based on frequency and the 1572nm frequency stabilization systems and method of Modulation Transfer Spectroscopy |
| CN107907067A (en) * | 2017-11-24 | 2018-04-13 | 天津大学 | A kind of fiber grating Bragg resonance wavelength based on periodic modulation determines method |
| CN107907067B (en) * | 2017-11-24 | 2020-04-10 | 天津大学 | Fiber bragg grating resonant wavelength determination method based on periodic modulation |
| CN113543451A (en) * | 2020-04-13 | 2021-10-22 | 中国科学院上海光学精密机械研究所 | Double-beam laser driving ion accelerating device |
| CN113543451B (en) * | 2020-04-13 | 2023-03-24 | 中国科学院上海光学精密机械研究所 | Double-beam laser driving ion accelerating device |
| CN112577942A (en) * | 2020-11-20 | 2021-03-30 | 重庆大学 | Same-core diatomic gas detection method and system based on photoacoustic stimulated Raman effect |
| CN112577942B (en) * | 2020-11-20 | 2022-06-21 | 重庆大学 | Same-core diatomic gas detection method and system based on photoacoustic stimulated Raman effect |
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