CN103091283B - A kind of ultraspectral resolution gas medium-wave infrared spectral measurement system - Google Patents
A kind of ultraspectral resolution gas medium-wave infrared spectral measurement system Download PDFInfo
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- CN103091283B CN103091283B CN201310059699.4A CN201310059699A CN103091283B CN 103091283 B CN103091283 B CN 103091283B CN 201310059699 A CN201310059699 A CN 201310059699A CN 103091283 B CN103091283 B CN 103091283B
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Abstract
The invention discloses a kind of ultraspectral resolution gas medium-wave infrared spectral measurement system.It is made up of the spectrometer without longitudinal mode broadband medium-wave infrared lasing light emitter, gas absorption cell and ultrahigh resolution; Spatially be directly incident on gas absorption cell without longitudinal mode broadband medium-wave infrared lasing light emitter via optical system, and obtain gas absorption spectra to be measured incide the spectrometer of ultrahigh resolution after gas absorption cell outgoing after.Adopt and make incident light source have spectral component feature that is continuous, spectrum-stable between different laser pulse without longitudinal mode broadband medium-wave infrared lasing light emitter, make the spectral measurement of ultrahigh resolution spectrometer can not be subject to the impact of moding.Therefore, while the present invention has catch light spectral resolution, the faint change of energy measurement gas absorption spectrum, is applicable to the measurement of trace gas.
Description
Technical field
The present invention relates to medium-wave infrared spectral measurement system, particularly relate to a kind of ultraspectral resolution gas medium-wave infrared spectral measurement system.
Background technology
Medium-wave infrared wave band is the characteristic absorption wave band of a lot of gas molecule, and at this wave band, corresponding gas absorption peak acutance is high, absorption coefficient large, therefore has the feature that high, the mutual interference of measurement sensistivity is little, is the desirable wave band that trace gaseous components is measured.
At medium-wave infrared wave band, the characteristic absorption peak of various gas, by Wavelength distribution arrangement, therefore if realize the high resolution spectral measuring to one section of wide spectral range rapidly, will be expected to the real-time Measurement accuracy realizing various trace gaseous components.
At present for the technical way realizing medium-wave infrared spectral measurement is infrared Fourier spectrometer, the commercialized technology as a kind of maturation has obtained in various production and scientific research field to be applied widely.But the resolution of Fourier spectrometer is comparatively limited, at present than its resolution of instrument of higher-end at 0.05cm-1, and expensive.The highest resolution that Fourier spectrometer is expected to realize also is limited to 0.005cm-1, and now interfere the length of arm by very large, this makes can not play a role in a lot of application.
Unlike this, in recent years along with the development of medium-wave infrared laser technology, there is the new technology in some laboratories, the spectral resolution of superelevation can have been obtained.Technical method relatively simple and practical in a kind of structure utilizes the wavelength (or frequency) of tunable single frequency laser to scan, and in conjunction with the technology of gas absorption cell and unit light electric explorer, is expected to obtain high spectral resolution.At medium-wave infrared wave band, the single absorption peak for certain gas is measured and can be adopted this type of technology.But because the wavelength tuning range of tunable laser limits, its spectral coverage measured is very narrow; Because relate to laser wavelength scan when measuring, the time also cannot accomplish real-time measurement.Therefore application is subject to larger restriction.
A kind of ultrahigh resolution spectral measurement mainstream technology studied in the world is at present light comb scanning techniques.By developing the laser light comb of (or one group) Frequency Locking, and the interference of two-dimensional spectrometer or two corresponding light combs (comb frequency slightly difference) is utilized to be expected to obtain the spectral measurement ability of ultrahigh resolution.But because the control of light comb is very complicated, system architecture relates to the Locking System of reference laser light benchmark and multiple optical frequency conversion formation, and whole system is too huge, is only limitted in vitro application at present.
Summary of the invention
The object of the invention is the deficiency overcoming other spectral measurement methodses, a kind of ultraspectral resolution gas medium-wave infrared spectral measurement system is provided.
Ultraspectral resolution gas medium-wave infrared spectral measurement system is made up of the spectrometer without longitudinal mode broadband medium-wave infrared lasing light emitter, gas absorption cell and ultrahigh resolution; Spatially be directly incident on gas absorption cell without longitudinal mode broadband medium-wave infrared lasing light emitter via optical system, and obtain gas absorption spectra to be measured incide the spectrometer of ultrahigh resolution after gas absorption cell outgoing after.
Described broadband medium-wave infrared LASER Light Source is the broadband medium-wave infrared LASER Light Source without longitudinal mode characteristic; Its wave band is positioned at 2.7 ~ 4.5 microns, and spectrum halfwidth is greater than 100nm.
The ultrahigh resolution spectrometer adopted has the spectral resolution more than 100MHz.
Present invention employs the broadband medium-wave infrared lasing light emitter without longitudinal mode and high-resolution spectrometer two core components.Broadband medium-wave infrared lasing light emitter without longitudinal mode is produced by spontaneous parametric down conversion principle or difference frequency transfer principle, and the spectral component continuous distribution of different frequency in spectrum, does not exist the longitudinal mode because resonator cavity causes.Because do not have longitudinal mode, with wavelength (or frequency) consecutive variations, will there is not common laser mode hopping problem in the spectral intensity of this lasing light emitter.Just because of this point, the high resolution spectrometer of System Back-end is being undertaken in spectroscopic measurements process by spectrum, and measuring-signal, by highly stable, can not be subject to the impact of moding.Therefore, ultraspectral resolution gas medium-wave infrared spectral measurement system disclosed in this invention is while having catch light spectral resolution, and the atomic weak change of energy measurement gas absorption spectrum, is highly suitable for the measurement of trace gas.
Accompanying drawing explanation
Fig. 1 is the structural representation of ultraspectral resolution gas medium-wave infrared spectral measurement system;
Fig. 2 is the theory structure schematic diagram of a kind of broadband of the present invention without longitudinal mode medium-wave infrared LASER Light Source;
Fig. 3 is the theory structure schematic diagram of another kind of broadband of the present invention without longitudinal mode medium-wave infrared LASER Light Source;
Fig. 4 is the theory structure schematic diagram of high resolution spectrometer of the present invention.
Embodiment
The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
As shown in Figure 1, ultraspectral resolution gas medium-wave infrared spectral measurement system is made up of the spectrometer 3 without longitudinal mode broadband medium-wave infrared lasing light emitter 1, gas absorption cell 2 and ultrahigh resolution; Without longitudinal mode broadband medium-wave infrared lasing light emitter 1, be spatially directly incident on gas absorption cell 2 via optical system, and obtain gas absorption spectra to be measured incide the spectrometer 3 of ultrahigh resolution after gas absorption cell 2 outgoing after.
Described broadband medium-wave infrared LASER Light Source 1 is the broadband medium-wave infrared LASER Light Source without longitudinal mode characteristic, and spectrum halfwidth is greater than 100nm, average power is greater than 1 milliwatt, and its wave band is positioned at 2.7 ~ 4.5 microns.
The ultrahigh resolution spectrometer 3 adopted has the spectral resolution more than 100MHz, and spectral bandwidth is greater than 100nm.
As shown in Figure 2, what ultraspectral resolution gas medium-wave infrared spectral measurement system comprised a kind ofly 7 to be made up of the periodicity farmland of mode locked fiber laser 4, the wide light source 5 of superradiance, dichroism spectroscope 6 and the chirped periodic magnesium-doped lithium niobate crystal (PPMgLN) that polarizes without longitudinal mode wide spectral medium-wave infrared lasing light emitter.Mode locked fiber laser 4 launches the pulse laser of high repetition frequency, and its wavelength coverage is 1.03 microns to 1.10 microns, and its range of pulse repetition frequency is 10kHz to 1GHz, and its pulse width is 100fs to 5ns; Superradiance broad spectrum light source 5 is launched continuously or the low power broadband spectral laser of pulse, its spectral range is between 1.4 microns to 1.80 microns, spectral half width is more than 100nm, and this wide spectral transmitting illuminant has without longitudinal mode characteristic, and its spectral power density presses wavelength (or frequency) continuous distribution; Dichroism spectroscope 6 is a kind of optical mirrors plating deielectric-coating, can the laser of transmission (or reflection) 1.03 microns to 1.1 microns, but for the laser reflection (or transmission) of 1.4 microns to 1.8 microns; Periodicity farmland polarization magnesium-doped lithium niobate crystal (PPMgLN) 7 of chirped periodic is that a kind of farmland cycle continually varying, farmland between 28 microns to 32 microns, to the artificial lens be alternately arranged, can meet the phase matching relationship during conversion of wide spectral in-band laser optical frequency.From the high repeat frequency pulsed laser that mode locked fiber laser 4 is launched, with the low power broadband spectral laser of the continuous or pulse of launching from the wide light source 5 of superradiance, close after bundle through dichroism spectroscope 6, enter periodicity farmland polarization magnesium-doped lithium niobate crystal (PPMgLN) 7 of chirped periodic simultaneously, can obtain medium-wave infrared wave band without longitudinal mode wide spectral Laser output.The chirp parameter of adjustment PPMgLN crystal, can obtain the Laser output of different-waveband.
As shown in Figure 3, the another kind that ultraspectral resolution gas medium-wave infrared spectral measurement system comprises also can only be made up of periodicity farmland polarization magnesium-doped lithium niobate crystal (PPMgLN) 7 of mode locked fiber laser 4, chirped periodic without longitudinal mode wide spectral medium-wave infrared lasing light emitter.Mode locked fiber laser 4 launches the pulse laser of high repetition frequency, and its wavelength coverage is 1.03 microns to 1.10 microns, and its range of pulse repetition frequency is 10kHz to 1GHz, and its pulse width is 100fs to 5ns; Periodicity farmland polarization magnesium-doped lithium niobate crystal (PPMgLN) 7 of chirped periodic is that a kind of farmland cycle continually varying farmland between 28 microns to 32 microns, to the artificial lens be alternately arranged, can meet the phase matching relationship during conversion of wide spectral wave band of laser optical frequency.From the high repeat frequency pulsed laser that mode locked fiber laser 4 is launched, enter periodicity farmland polarization magnesium-doped lithium niobate crystal (PPMgLN) 7 of chirped periodic, can obtain medium-wave infrared wave band without longitudinal mode wide spectral Laser output.The chirp parameter of adjustment PPMgLN crystal, can obtain the Laser output of different-waveband.
A kind of high resolution spectrometer that ultraspectral resolution gas medium-wave infrared spectral measurement system comprises is a kind of novel spectrometer having ultraspectral resolution, can measure broadband medium-wave infrared spectrum in real time.The structure of this spectrometer as shown in Figure 4.This spectrometer comprises photodetector 9, plane blazed grating 10(or a concave reflection grating of a two-dimensional array), a virtual image array light-splitting device (VIPA) 11, its spectral resolution reaches more than 1GHz; When needs obtain more high spectral resolution, a tunable enamel Pori-perot filter 8 can be introduced before two-dimensional spectrometer.Tunable enamel Pori-perot filter 8 is controlled by impressed voltage, continuous print can be become pectination Laser output without longitudinal mode laser, and the exact wavelengths position of its pectination Laser output, by Control of Voltage, can be scanned with added change in voltage.Two-dimensional spectrometer can make spectrometer have spectral resolution higher than 100MHz in conjunction with the structure of tunable enamel Pori-perot filter.
The gas absorption cell that ultraspectral resolution gas medium-wave infrared spectral measurement system comprises is a kind of single-pass of routine or leads to gas absorption cell more.The gas absorption pool structure of single-pass is simple, but gas absorption light path is shorter, is suitable for the application scenario that gas concentration is higher.Many logical gas absorption cells can increase gas absorption optical path length effectively, and the absorption of minimum gas can spectrally reflected.
Claims (2)
1. a ultraspectral resolution gas medium-wave infrared spectral measurement system, is characterized in that it is made up of the spectrometer (3) without longitudinal mode broadband medium-wave infrared lasing light emitter (1), gas absorption cell (2) and ultraspectral resolution; Spatially be directly incident on gas absorption cell (2) without longitudinal mode broadband medium-wave infrared lasing light emitter (1) via optical system, and the spectrometer (3) inciding ultrahigh resolution after gas absorption cell (2) outgoing obtains gas absorption spectra to be measured afterwards; Described broadband medium-wave infrared LASER Light Source (1) is the broadband medium-wave infrared LASER Light Source without longitudinal mode characteristic; Its wave band is positioned at 2.7 ~ 4.5 microns, and spectrum halfwidth is greater than 100nm; Become pectination Laser output without longitudinal mode broadband medium-wave infrared lasing light emitter (1) via tunable enamel Pori-perot filter (8), the exact wavelengths position of pectination Laser output, by Control of Voltage, is scanned with added change in voltage.
2. a kind of ultraspectral resolution gas medium-wave infrared spectral measurement system according to claim 1, is characterized in that adopted ultrahigh resolution spectrometer (3) has the spectral resolution more than 100MHz.
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| CN104807545B (en) * | 2015-04-17 | 2017-06-16 | 天津大学 | The high-precision spectral measurement device of spatio-temporal synergy and method |
| CN107765261A (en) * | 2017-11-10 | 2018-03-06 | 常熟市浙大紫金光电技术研究中心 | All band three-dimensional EO-1 hyperion laser radar |
| CN109167244A (en) * | 2018-08-14 | 2019-01-08 | 杭州镭克普光电技术有限公司 | A kind of system using chirp domain inversion structures nonlinear crystal improving laser difference frequency medium-wave infrared laser output power |
| CN113820293A (en) * | 2020-06-19 | 2021-12-21 | 核工业理化工程研究院 | Low-temperature gas spectrum measuring device and using method thereof |
| CN113376725B (en) * | 2021-05-13 | 2022-06-10 | 山东大学 | Optical filtering device |
| CN113777068B (en) * | 2021-09-13 | 2023-07-18 | 国网四川省电力公司电力科学研究院 | Multiband-cavity enhanced infrared comb spectrum gas detection system |
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| US7733924B2 (en) * | 2005-08-15 | 2010-06-08 | William Marsh Rice University | Piezo activated mode tracking system for widely tunable mode-hop-free external cavity mid-IR semiconductor lasers |
| US7538881B2 (en) * | 2006-02-17 | 2009-05-26 | The Regents Of The University Of Colorado, A Body Corporate | Frequency comb cavity enhanced spectroscopy |
| CN101520342B (en) * | 2009-03-25 | 2010-11-17 | 中国科学院上海技术物理研究所 | Infrared Fourier spectrum detector with ultrahigh spectral resolution |
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