CN105552713A - Multi-wavelength external cavity laser for non-fluorescence raman spectrometer - Google Patents
Multi-wavelength external cavity laser for non-fluorescence raman spectrometer Download PDFInfo
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- CN105552713A CN105552713A CN201610101004.8A CN201610101004A CN105552713A CN 105552713 A CN105552713 A CN 105552713A CN 201610101004 A CN201610101004 A CN 201610101004A CN 105552713 A CN105552713 A CN 105552713A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
- H01S5/0427—Electrical excitation ; Circuits therefor for applying modulation to the laser
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/14—External cavity lasers
- H01S5/146—External cavity lasers using a fiber as external cavity
- H01S5/147—External cavity lasers using a fiber as external cavity having specially shaped fibre, e.g. lensed or tapered end portion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
- H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar
Abstract
The invention discloses a multi-wavelength external cavity laser for a non-fluorescence raman spectrometer. More than two laser diodes with equal central wavelengths in an array are driven to be independently opened and closed through a power supply switching circuit; output light beams are calibrated into parallel collimated laser beams through a collimating laser calibration optical element; a special design is adopted by a grating; different grating periods are set for incident point regions, corresponding to the collimated laser beams, of the grating; the collimated laser beams form zero-order reflected beams and first-order diffracted beams after being diffracted by the grating; the zero-order reflected beams are output in the same direction and have a wavelength difference; the first-order diffracted beams return to the inside of the corresponding laser diodes along the original path to participate in internal mode competition of a resonant cavity; and the zero-order reflected beams are converged into an optical fiber combiner through an optical fiber coupling lens for wavelength output. The wavelength output is switched by the circuit, so that the unreliability and the possible error of conventional mechanical adjustment are eliminated; a tuning structure is relatively simple and stable; high stability of output wavelengths is ensured; the wavelength output repeatability in actual operation is high; and the tuning accuracy is relatively high.
Description
Technical field
The present invention relates to a kind of external cavity laser emitter, in particular, relate to a kind of multi-wavelength outside cavity gas laser for unstressed configuration Raman spectrometer.
Background technology
At present, Raman spectrometer detects at the scene, drugs of abuse, the field such as Pesticides Testing have a very wide range of applications.But in the process detected agricultural chemicals, drugs, explosive etc., Raman spectrum is subject to hyperfluorescenceZeng Yongminggaoyingguang interference.Raman light intensity is much smaller than fluorescence intensity to such an extent as to flooded by fluorescence thus cannot Raman spectrum be detected.Therefore, must Fluorophotometry in order to Raman spectrum can be detected efficiently.
Present stage, the method for Fluorophotometry has a variety of, and what mainly adopt is baseline correction.Namely baseline correction simulates the fluorescence background in spectrogram by specific algorithm and is deducted.Owing to there is error of fitting, baseline correction is not suitable for the situation of fluorescence background more complicated, can there is some people for distortion.
In contrast, the multi-wavelength shift frequency excitation method (SEDRS) that existing Portable Raman spectrometer adopts can adapt to effective Fluorophotometry under the background of complexity.The principle of its foundation is: change because wavelength of fluorescence can not change along with excitation wavelength, Raman spectral peaks but obvious displacement can occur.Therefore, with the light of two wavelength difference small (one is long and the other is short) respectively excited sample obtain two groups of Raman spectrums with fluorescence background (in same figure), as shown in Figure 1; Again two groups of Raman spectrums with fluorescence background are carried out difference and can eliminate fluorescence, be there is the difference Raman spectrum of " positive negative ", as shown in Figure 2.Finally, related algorithm is utilized to restore Raman spectrum.
The key of multi-wavelength shift frequency excitation method is to produce wavelength Raman excitation source.For dual wavelength Raman excitation light source, this type of light source mainly adopts Tunable External Cavity Semiconductor Laser at present, and it utilizes grating as feedback element, realizes wavelength tuning by rotating shutter.Be illustrated in figure 3 Tunable External Cavity Semiconductor Laser schematic diagram common at present, wherein laser diode 1 export light be incident on grating 3 through collimating lens 2, first-order diffraction light be reflected back in laser diode 1 participate in mode competition realize single longitudinal mode export; Around predetermined fulcrum rotating grating 3 certain angle δ, make the angle of diffraction of incident light θ from figure
1become θ
2, according to optical grating diffraction formula " 2dsin θ=m λ ", known corresponding output wavelength λ also there occurs change, and d is screen periods.
Change first-order diffraction optical wavelength and can realize wavelength regulation.Owing to there is mechanical displacement means (rotating mechanism of grating 3), the program has tuning structure complexity, poor stability, output wavelength repeatability is weak, multi-wavelength switches inconvenience, precision is low, be not easy to be coupled (causing because outbound course is inconsistent), regulate the shortcomings such as loaded down with trivial details.
Summary of the invention
The present invention seeks to: a kind of multi-wavelength outside cavity gas laser for unstressed configuration Raman spectrometer is provided, it is based on shift frequency excitation principle, known laser emitter tuning structure can be overcome complicated, poor stability, output wavelength repeatability is weak, multi-wavelength switches the shortcoming regulating inconvenience, is intended to the robust structure realizing no-raster moving-member, more convenient to operate, output wavelength is more stable, and is convenient to coupling.
Technical scheme of the present invention is: a kind of multi-wavelength outside cavity gas laser for unstressed configuration Raman spectrometer, is characterized in that comprising:
Parallel laser emitter, it is the collimation laser collimation optical elements of parallel collimated laser beam for the laser beam alignment sent by each laser diode that this device comprises the diode laser matrix that is made up of the laser diode that at least two centre wavelength is identical with what be arranged in diode laser matrix front end;
Grating, its exit path being arranged in aforementioned parallel collimated laser beam forms exocoel, and this grating corresponds to the incidence point region of described each collimated laser beam and have different screen periods respectively, each collimated laser beam is formed and exports in the same way and have the zero order reflection light beam of wavelength difference and Yan Yuanlu returns the first-order diffraction light beam that respective laser diodes inside participates in intra resonant cavity mode competition after this optical grating diffraction;
Optical fiber closes road output device, comprises fiber coupling lens and optical fiber mixer, and described fiber coupling lens is used for that the described zero order reflection light beam via aforementioned grating outgoing is converged to optical fiber mixer and carries out wavelength output;
Controller, comprises and connects and drive the power supply switch circuit of each laser diode independence break-make.
Further, collimation laser collimation optical elements described in the present invention comprises fast axis collimation mirror and microlens array, described microlens array comprises at least two lenticules, and each laser diode one_to_one corresponding in each lenticule and described diode laser matrix, described fast axis collimation mirror is then arranged between diode laser matrix and microlens array.
Preferably, grating described in the present invention is chirp grating or the jointing grating got up by least two different cycles raster detect.
It may be noted that, according to formula " 2dsin θ=m λ ", in this case, collimated laser beam is relative to the incident angle θ of grating, and on grating each regional cycle d actual range be all come predetermined according to the centre wavelength of each laser diode, as far as possible object ensures that the wavelength values of each zero order reflection light beam exported through grating is near centre wavelength.
The connection related in the present invention also drives the power supply switch circuit of each laser diode independence break-make to be all attainable known technologies of those skilled in the art.
Operation principle of the present invention is as follows:
The collimation laser collimation optical elements of diode laser matrix and front end guarantees the generation of collimate in parallel laser beam.Evenly and be arranged side by side, namely the laser beam of their injections through fast axis collimation mirror collimation, then forms parallel collimated laser beam through after the lenticule outgoing of correspondence to laser diode in array respectively.
Parallel collimated laser beam is incident on the grating of front end, although incidence point position is different, the diffraction angle produced after optical grating diffraction is then identical.Because grating adopts special construction in this case, the incidence point region it corresponding to each collimated laser beam has different screen periods respectively, according to optical grating diffraction formula " 2dsin θ=m λ ", the difference of known cycle d ensure that the output wavelength λ of each collimated laser beam after optical grating diffraction is also different.
In this case, each laser diode is fixed in advance, and the switching exported for different wave length relies on the power supply switch circuit in controller to realize, and makes each laser diode independence break-make, complete respective wavelength and export by the switching of circuit.Certain this case is the front end laser beam emitting device of Raman spectrometer, after the zero order reflection light beam that the wavelength that each laser diode produces through optical grating diffraction does not wait is collected by optical fiber mixer, excited sample is to obtain the Raman spectrum that (being detected by the inductor of Raman spectrometer inside) organizes fluorescence background more respectively, more finally synthesizes the good recovery Raman spectrum of Control of Fluorescence by processor calculus of differences.
The present invention is by rationally arranging the screen periods in the different incidence point regions of corresponding each collimated laser beam on (groove) grating, or the prefabricated chirp grating that selection meets the demands, or select the jointing grating that gets up to make by selected different cycles raster detect as required, namely just can realize the tuning of final output wavelength by change cycle d.
Advantage of the present invention is:
The present invention aims to provide that a kind of structure of mechanical adjustment member is more firm, output wavelength is more stable, and operation is more simply and easily for the multi-wavelength outside cavity gas laser of unstressed configuration Raman spectrometer.The present invention compares the existing external-cavity semiconductor laser utilizing rotary type grating (mechanical adjustment parts) to realize wavelength tuning, and it has following advantage:
1) by the switching of the different output wavelength of power supply switch circuit control realization, mechanical adjustment member is namely without the need to rotating shutter, the unreliability eliminating mechanical adjustment and the error that may introduce, make tuning structure more simple firm, ensure that the high stability of output wavelength, the repeatability that during practical operation, wavelength exports is strong, greatly can improve tuning precision;
2) by the switching of the different output wavelength of power supply switch circuit control realization, can wavelength switching easily and fast, operation is more simple, can save the operating time, increase work efficiency;
3) realize single longitudinal mode by grating external-cavity feedback to export, live width <0.2nm;
4) the present invention uses same grating to do feed back to multiple laser diode, instead of a grating pair answers a laser diode, and be arranged into array between laser diode, but not arbitrarily angled arrangement, therefore feedback arrangement layout is simple, can save manufacturing cost.
5) in the present invention because stop position is motionless, the zero order light reflected of each collimate in parallel laser beam after optical grating diffraction is also directional light, outbound course is consistent, be convenient to carry out optical coupling to it, namely single optical fiber coupled lens is adopted can to realize coupling, and without the need to as routine techniques respectively the folded light beam of corresponding all angles arrange coupled lens, can be greatly cost-saving, and coupling accuracy and reliability higher.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is the original Raman spectrum schematic diagram before the non-difference of exciting light of two groups of wavelength;
(in figure, solid line excites Raman curve for short wavelength, and dotted line is long-wavelength excitation Raman curve)
Fig. 2 is the difference Raman spectrogram that the exciting light of two groups of wavelength in Fig. 1 obtains after difference;
Fig. 3 is existing Tunable External Cavity Semiconductor Laser schematic diagram;
Fig. 4 is structural representation of the present invention:
In figure: 1, laser diode; 2, collimating lens; 3, grating; 4, fast axis collimation mirror; 5, lenticule; 6, fiber coupling lens; 7, optical fiber mixer; 8, controller.
Embodiment
Embodiment: combine and Figure 4 shows that a kind of specific embodiment of the present invention for the multi-wavelength outside cavity gas laser of unstressed configuration Raman spectrometer, it is a kind of dual wavelength outside cavity gas laser specifically, and by parallel laser emitter, grating, optical fiber closes road output device and controller formed.
Parallel laser emitter in the present embodiment is made up of diode laser matrix, fast axis collimation mirror 4 and microlens array, and described fast axis collimation mirror 4 and microlens array form collimation laser collimation optical elements.Diode laser matrix is arranged side by side by upper and lower two and the identical laser diode 1 of centre wavelength forms and (is certainly only example herein, the present invention is not limited to the scheme of layout two laser diodes, it can be three, four, even more), described microlens array and diode laser matrix positioned opposite, this microlens array is made up of upper and lower two lenticules be arranged side by side 5, and each lenticule 5 and each laser diode 1 one_to_one corresponding in described diode laser matrix, described fast axis collimation mirror 4 is then arranged between diode laser matrix and microlens array.The laser beam that each laser diode 1 penetrates collimates through fast axis collimation mirror 4, more namely forms parallel collimated laser beam through after lenticule 5 outgoing of correspondence respectively.
What grating 3 described in the present embodiment adopted is chirp grating, and the exit path that its tilt (45 °) are arranged in aforementioned parallel collimated laser beam forms exocoel.The centre wavelength of described laser diode 1 is 785nm, and on grating 3 correspond to described each collimated laser beam incidence point region respectively groove form different screen periods, groove is respectively 1795/mm and 1805/mm, the corresponding cycle is then respectively 1/1795 (mm) and 1/1805 (mm), and each collimated laser beam is formed and exports in the same way and have the first-order diffraction light beam that the zero order reflection light beam of wavelength difference and Yan Yuanlu return the mode competition of respective laser diodes 1 inner participation intra resonant cavity after this grating 3 diffraction.
Optical fiber described in the present embodiment closes road output device and is made up of fiber coupling lens 6 and optical fiber mixer 7, the quantity of described fiber coupling lens 6 is one, carries out wavelength output for the zero order reflection light beam via the outgoing of aforementioned grating 3 is converged to optical fiber mixer 7.
The inside of controller 8 described in the present embodiment is provided with and connects and drive the power supply switch circuit of the independent break-make of each laser diode 1.
Operation principle of the present invention is as follows:
The collimation laser collimation optical elements of diode laser matrix and front end guarantees the generation of collimate in parallel laser beam.Evenly and be arranged side by side, the laser beam of their injections collimates through fast axis collimation mirror 4 laser diode 1 in array, more namely forms parallel collimated laser beam through after lenticule 5 outgoing of correspondence respectively.
Parallel collimated laser beam is incident on the grating 3 of front end, although incidence point position is different, the diffraction angle produced after grating 3 diffraction is then identical, as Fig. 4.Because grating 3 adopts special construction in this case, the incidence point region it corresponding to each collimated laser beam has different screen periods respectively, according to optical grating diffraction formula " 2dsin θ=m λ ", the difference of known cycle d ensure that the output wavelength λ of each collimated laser beam after grating 3 diffraction is also different.Because of incidence angle θ in this example be 45 ° time, according to formula " 2dsin θ=m λ ", the dual-wavelength laser that wavelength is respectively 787.8nm and 783.5nm can be obtained in theory.
In this case, each laser diode 1 is fixed in advance, and the switching exported for different wave length relies on the power supply switch circuit in controller 8 to realize, and makes the independent break-make of each laser diode 1, complete respective wavelength and export by the switching of circuit.Certain this case is the front end laser beam emitting device of Raman spectrometer, after the output beam that the wavelength that each laser diode 1 produces through grating 3 diffraction does not wait is collected by optical fiber mixer 7, excited sample is to obtain the Raman spectrum (can be shown in Figure 1) of (being detected by the inductor of Raman spectrometer inside) two groups of fluorescence backgrounds respectively, obtains the good Raman spectrum (can be shown in Figure 2) of Control of Fluorescence finally by the synthesis of processor calculus of differences.
Certain above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All modifications done according to the Spirit Essence of main technical schemes of the present invention, all should be encompassed within protection scope of the present invention.
Claims (3)
1., for a multi-wavelength outside cavity gas laser for unstressed configuration Raman spectrometer, it is characterized in that comprising:
Parallel laser emitter, it is the collimation laser collimation optical elements of parallel collimated laser beam for the laser beam alignment sent by each laser diode (1) that this device comprises the diode laser matrix that is made up of the laser diode (1) that at least two centre wavelength is identical with what be arranged in diode laser matrix front end;
Grating (3), its exit path being arranged in aforementioned parallel collimated laser beam forms exocoel, and the upper incidence point region corresponding to described each collimated laser beam of this grating (3) has different screen periods respectively, each collimated laser beam is formed and exports in the same way and have the zero order reflection light beam of wavelength difference and Yan Yuanlu returns the first-order diffraction light beam that respective laser diodes (1) inside participates in intra resonant cavity mode competition after this grating (3) diffraction;
Optical fiber closes road output device, comprise fiber coupling lens (6) and optical fiber mixer (7), described fiber coupling lens (6) carries out wavelength output for the described zero order reflection light beam via aforementioned grating (3) outgoing is converged to optical fiber mixer (7);
Controller, comprises and connects and drive the power supply switch circuit of each laser diode (1) independent break-make.
2. the multi-wavelength outside cavity gas laser for unstressed configuration Raman spectrometer according to claim 1, it is characterized in that described collimation laser collimation optical elements comprises fast axis collimation mirror (4) and microlens array, described microlens array comprises at least two lenticules (5), and each lenticule (5) and each laser diode (1) one_to_one corresponding in described diode laser matrix, described fast axis collimation mirror (4) is then arranged between diode laser matrix and microlens array.
3. the multi-wavelength outside cavity gas laser for unstressed configuration Raman spectrometer according to claim 1, is characterized in that described grating (3) is for chirp grating or the jointing grating got up by least two different cycles raster detect.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111562252A (en) * | 2020-06-30 | 2020-08-21 | 普识和康(杭州)科技有限公司 | Raman detection system based on coaxial dual-wavelength fluorescence elimination |
| CN113258447A (en) * | 2021-05-18 | 2021-08-13 | 中国科学院长春光学精密机械与物理研究所 | Semiconductor laser array and preparation method thereof |
| CN115128820A (en) * | 2022-08-30 | 2022-09-30 | 中国科学院长春光学精密机械与物理研究所 | Chirp reflection type volume Bragg grating feedback spectrum beam combining device and method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201017150Y (en) * | 2006-11-21 | 2008-02-06 | 北京工业大学 | Coupling device for realizing high power laser diode pile light beam combination |
| US7339727B1 (en) * | 2003-01-30 | 2008-03-04 | Northrop Grumman Corporation | Method and system for diffractive beam combining using DOE combiner with passive phase control |
| CN102025105A (en) * | 2009-09-09 | 2011-04-20 | 中国科学院半导体研究所 | Blazed grating outer cavity semiconductor laser device and collimation method thereof |
| CN102208753A (en) * | 2011-04-27 | 2011-10-05 | 苏州华必大激光有限公司 | External cavity semiconductor laser with multi-wavelength combination |
| CN103887707A (en) * | 2014-04-09 | 2014-06-25 | 北京工业大学 | Semiconductor laser device with high-power and high-beam-quality lasers |
| CN104600566A (en) * | 2014-12-11 | 2015-05-06 | 北京工业大学 | High beam quality of semiconductor laser array beam combination device |
-
2016
- 2016-02-24 CN CN201610101004.8A patent/CN105552713B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7339727B1 (en) * | 2003-01-30 | 2008-03-04 | Northrop Grumman Corporation | Method and system for diffractive beam combining using DOE combiner with passive phase control |
| CN201017150Y (en) * | 2006-11-21 | 2008-02-06 | 北京工业大学 | Coupling device for realizing high power laser diode pile light beam combination |
| CN102025105A (en) * | 2009-09-09 | 2011-04-20 | 中国科学院半导体研究所 | Blazed grating outer cavity semiconductor laser device and collimation method thereof |
| CN102208753A (en) * | 2011-04-27 | 2011-10-05 | 苏州华必大激光有限公司 | External cavity semiconductor laser with multi-wavelength combination |
| CN103887707A (en) * | 2014-04-09 | 2014-06-25 | 北京工业大学 | Semiconductor laser device with high-power and high-beam-quality lasers |
| CN104600566A (en) * | 2014-12-11 | 2015-05-06 | 北京工业大学 | High beam quality of semiconductor laser array beam combination device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111562252A (en) * | 2020-06-30 | 2020-08-21 | 普识和康(杭州)科技有限公司 | Raman detection system based on coaxial dual-wavelength fluorescence elimination |
| CN113258447A (en) * | 2021-05-18 | 2021-08-13 | 中国科学院长春光学精密机械与物理研究所 | Semiconductor laser array and preparation method thereof |
| CN115128820A (en) * | 2022-08-30 | 2022-09-30 | 中国科学院长春光学精密机械与物理研究所 | Chirp reflection type volume Bragg grating feedback spectrum beam combining device and method |
| CN115128820B (en) * | 2022-08-30 | 2022-11-08 | 中国科学院长春光学精密机械与物理研究所 | Chirp reflection type volume Bragg grating feedback spectrum beam combining device and method |
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