CN105067114A - Multi-wavelength external cavity laser emitter used for inhibiting Raman spectrometer fluorescence - Google Patents
Multi-wavelength external cavity laser emitter used for inhibiting Raman spectrometer fluorescence Download PDFInfo
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- CN105067114A CN105067114A CN201510424163.7A CN201510424163A CN105067114A CN 105067114 A CN105067114 A CN 105067114A CN 201510424163 A CN201510424163 A CN 201510424163A CN 105067114 A CN105067114 A CN 105067114A
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Abstract
The invention discloses a multi-wavelength external cavity laser emitter used for inhibiting Raman spectrometer fluorescence. The emitter employs a power supply switching circuit to connect with more than two laser diodes, and drive the laser diodes to independently connect and disconnect; each laser diode outputs a collimated light beam through a corresponding collimating lens; an angle delta is preset between adjacent collimated light beams. All the collimated light beams are all finally diffracted through a same raster, and then form output beams which are directly outputted from different diffraction angles, and diffraction beams which return to the interior of corresponding laser diodes along original paths to take part in resonant cavity inner mode competition; the output beams are finally gathered by a fiber coupling lens to a fiber combiner to perform wavelength output. The emitter employs a circuit to switch wavelength output, eliminates the unreliability and possible introduced errors of normal mechanical regulation, makes a tuning structure simpler and more stable, guarantees the high stability of an output wavelength, and the strong repeatability of wavelength output in real operation, and substantially improves tuning precision.
Description
Technical field
The present invention relates to a kind of external cavity laser emitter, in particular, relate to a kind of multi-wavelength external cavity laser emitter for Raman spectrometer Control of Fluorescence.
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 collimation 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.
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, and it is low that output wavelength repeatability is weak, multi-wavelength switches precision, regulates the shortcomings such as loaded down with trivial details.
Summary of the invention
The present invention seeks to: a kind of multi-wavelength external cavity laser emitter for Raman spectrometer Control of Fluorescence 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.
Technical scheme of the present invention is: a kind of multi-wavelength external cavity laser emitter for Raman spectrometer Control of Fluorescence, is characterized in that comprising:
Collimation laser transmitting group, it comprises the collimation laser emitter of more than two, and each collimation laser emitter all comprises a laser diode and collimating lens, and is preset with angle δ between the collimated light beam that sends of adjacent two collimation laser emitters;
Grating, its collimated light beam exit path being arranged in aforementioned each collimation laser emitter forms exocoel, each collimated light beam becomes the output beam of direct outgoing after this optical grating diffraction with different diffraction dihedral, and returns the diffracted beam that respective laser diodes inside participates in intra resonant cavity mode competition along former road;
Optical fiber closes road output unit, comprises fiber coupling lens and optical fiber combiner, and described fiber coupling lens is used for that the output beam via aforementioned grating outgoing is converged to optical fiber combiner and carries out wavelength output;
Controller, comprises and connects and drive the power supply switch circuit of each laser diode independence break-make.
Further, described in the present invention, grating is preferably blazed grating, each collimated light beam all can form the zero order light reflected of direct outgoing after this optical grating diffraction, and returns the first-order diffraction light that respective laser diodes inside participates in intra resonant cavity mode competition along former road.
Further, the δ of angle described in the present invention meets: 0 ° of < δ < 10 °.
Further, the δ of angle described in the present invention is 1 ° or 2 °.
Further, the quantity of fiber coupling lens described in the present invention is consistent with the quantity of laser diode, and the output beam of grating described in all corresponding road of each fiber coupling lens.
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.
Principle of work of the present invention is as follows:
The generation of collimated light beam guaranteed by the collimation lens of laser diode and front end.For grating, each laser diode is all by the angle preset and incident orientation arrangement, all there is angle δ between the collimated light beam that often adjacent two laser diodes penetrate through collimation lens, and the existence of angle δ ensure that each collimated light beam has different diffraction angle after optical grating diffraction.According to optical grating diffraction formula " 2dsin θ=m λ ", when the known diffraction angle when each collimated light beam is different, its output wavelength 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 output beam that the wavelength that each laser diode produces through optical grating diffraction does not wait is collected by optical fiber combiner, 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 passes through Layout-Angle and the incident orientation of reasonable adjusting two collimation laser emitters (laser diode and collimation lens), namely changes δ angle and just can realize the tuning of final output wavelength.
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 external cavity laser emitter of Raman spectrum Control of Fluorescence.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 working 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, therefore feedback arrangement is simple, can save manufacturing cost.
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, collimation lens; 3, grating; 4, fiber coupling lens; 5, optical fiber combiner; 6, controller.
Embodiment
Embodiment: combine and Figure 4 shows that a kind of specific embodiment of the present invention for the multi-wavelength external cavity laser emitter of Raman spectrometer Control of Fluorescence, it is a kind of dual wavelength external cavity laser emitter specifically, launches group, grating, optical fiber closes road output unit and controller forms jointly by collimation laser.
Collimation laser transmitting group in the present embodiment is made up of two collimation laser emitters, each collimation laser emitter is formed by a laser diode 1 and a collimation lens 2 being arranged on laser diode 1 front end, and be preset with angle δ between the collimated light beam that sends of adjacent two collimation laser emitters, 0 ° of < δ < 10 °, is set to 1 ° or 2 ° usually.
What grating 3 described in the present embodiment adopted is the blazed grating of reflective diffraction, its collimated light beam exit path being arranged in aforementioned two collimation laser emitters forms exocoel, each collimated light beam becomes the zero order light reflected of direct outgoing after this grating 3 diffraction with different diffraction dihedral, and returns the first-order diffraction light that respective laser diodes 1 inside participates in intra resonant cavity mode competition along former road.
Optical fiber described in the present embodiment closes road output unit and is made up of fiber coupling lens 4 and optical fiber combiner 5, and described fiber coupling lens 4 carries out wavelength output for the zero order reflection light beam via the outgoing of aforementioned grating 3 is converged to optical fiber combiner 5 (y-type optical fiber); The quantity of described fiber coupling lens 4 is also two, the zero order reflection light beam of grating 3 described in all corresponding road of each fiber coupling lens 4.
The inside of controller 6 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.
Principle of work of the present invention is as follows:
The generation of collimated light beam guaranteed by the collimation lens 2 of laser diode 1 and front end.For grating 3, each laser diode 1 is all by the angle preset and incident orientation arrangement, angle δ is there is between the collimated light beam that in the present embodiment, adjacent two laser diodes 1 penetrate through collimation lens 2, and the existence of angle δ ensure that each collimated light beam has different diffraction angle after grating 3 diffraction, i.e. θ in Fig. 4
1and θ
2, according to optical grating diffraction formula " 2dsin θ=m λ ", when the known diffraction angle when each collimated light beam is different, its output wavelength λ is also different.
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 6 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 combiner 5, 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.
The present invention passes through Layout-Angle and the incident orientation of reasonable adjusting two collimation laser emitters (laser diode 1 and collimation lens 2), namely changes δ angle and just can realize the tuning of final output wavelength.
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 (5)
1., for a multi-wavelength external cavity laser emitter for Raman spectrometer Control of Fluorescence, it is characterized in that comprising:
Collimation laser transmitting group, it comprises the collimation laser emitter of more than two, each collimation laser emitter all comprises a laser diode (1) and collimating lens (2), and is preset with angle δ between the collimated light beam that sends of adjacent two collimation laser emitters;
Grating (3), its collimated light beam exit path being arranged in aforementioned each collimation laser emitter forms exocoel, each collimated light beam becomes the output beam of direct outgoing after this grating (3) diffraction with different diffraction dihedral, and returns the diffracted beam that respective laser diodes (1) inside participates in intra resonant cavity mode competition along former road;
Optical fiber closes road output unit, comprise fiber coupling lens (4) and optical fiber combiner (5), described fiber coupling lens (4) carries out wavelength output for the output beam via aforementioned grating (3) outgoing is converged to optical fiber combiner (5);
Controller (6), comprises and connects and drive the power supply switch circuit of each laser diode (1) independent break-make.
2. the multi-wavelength external cavity laser emitter for Raman spectrometer Control of Fluorescence according to claim 1, it is characterized in that described grating (3) is blazed grating, each collimated light beam all can form the zero order light reflected of direct outgoing after this grating (3) diffraction, and returns the first-order diffraction light that respective laser diodes (1) inside participates in intra resonant cavity mode competition along former road.
3. the multi-wavelength external cavity laser emitter for Raman spectrometer Control of Fluorescence according to claim 1 and 2, is characterized in that described angle δ meets: 0 ° of < δ < 10 °.
4. the multi-wavelength external cavity laser emitter for Raman spectrometer Control of Fluorescence according to claim 1, it is characterized in that the quantity of described fiber coupling lens (4) is consistent with the quantity of laser diode (1), and the output beam of grating (3) described in all corresponding road of each fiber coupling lens (4).
5. the multi-wavelength external cavity laser emitter for Raman spectrometer Control of Fluorescence according to claim 3, is characterized in that described angle δ is 1 ° or 2 °.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510296A (en) * | 2015-12-29 | 2016-04-20 | 北京华泰诺安探测技术有限公司 | Portable fluorescence-disappearance Raman spectrum detection system |
| CN105784643A (en) * | 2016-03-07 | 2016-07-20 | 华中科技大学 | Device and method for reducing fluorescent background of gas Raman spectrum |
| CN105866099A (en) * | 2016-05-16 | 2016-08-17 | 天津大学 | Raman spectrum acquisition system with low-fluorescence background |
| CN107561059A (en) * | 2017-09-28 | 2018-01-09 | 中国科学院苏州生物医学工程技术研究所 | Multi-wavelength line scans Raman spectrometer |
| CN112290374A (en) * | 2020-09-23 | 2021-01-29 | 北京遥测技术研究所 | Wide tuning semiconductor laser cavity based on multi-channel composite external cavity beam combination |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6192062B1 (en) * | 1998-09-08 | 2001-02-20 | Massachusetts Institute Of Technology | Beam combining of diode laser array elements for high brightness and power |
| US20030193974A1 (en) * | 2002-04-16 | 2003-10-16 | Robert Frankel | Tunable multi-wavelength laser device |
| 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 |
| US20130182247A1 (en) * | 2006-10-24 | 2013-07-18 | Pd-Ld, Inc. | Compact, Low Cost Raman Monitor For Single Substances |
| CN104597034A (en) * | 2015-02-04 | 2015-05-06 | 厦门大学 | Raman spectra measuring device for multi-wavelength laser frequency shift excitation |
| CN204854960U (en) * | 2015-07-17 | 2015-12-09 | 苏州大学 | A multi -wavelength exocoel laser emission device for raman spectrometer fluorescence restraines |
-
2015
- 2015-07-17 CN CN201510424163.7A patent/CN105067114B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6192062B1 (en) * | 1998-09-08 | 2001-02-20 | Massachusetts Institute Of Technology | Beam combining of diode laser array elements for high brightness and power |
| US20030193974A1 (en) * | 2002-04-16 | 2003-10-16 | Robert Frankel | Tunable multi-wavelength laser device |
| US20130182247A1 (en) * | 2006-10-24 | 2013-07-18 | Pd-Ld, Inc. | Compact, Low Cost Raman Monitor For Single Substances |
| 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 |
| CN104597034A (en) * | 2015-02-04 | 2015-05-06 | 厦门大学 | Raman spectra measuring device for multi-wavelength laser frequency shift excitation |
| CN204854960U (en) * | 2015-07-17 | 2015-12-09 | 苏州大学 | A multi -wavelength exocoel laser emission device for raman spectrometer fluorescence restraines |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510296A (en) * | 2015-12-29 | 2016-04-20 | 北京华泰诺安探测技术有限公司 | Portable fluorescence-disappearance Raman spectrum detection system |
| CN105510296B (en) * | 2015-12-29 | 2018-08-31 | 北京华泰诺安探测技术有限公司 | The portable fluorescence Raman spectrum detection system that disappears |
| CN105784643A (en) * | 2016-03-07 | 2016-07-20 | 华中科技大学 | Device and method for reducing fluorescent background of gas Raman spectrum |
| CN105784643B (en) * | 2016-03-07 | 2019-03-05 | 华中科技大学 | A kind of devices and methods therefor reducing gas Raman spectrum fluorescence background |
| CN105866099A (en) * | 2016-05-16 | 2016-08-17 | 天津大学 | Raman spectrum acquisition system with low-fluorescence background |
| CN107561059A (en) * | 2017-09-28 | 2018-01-09 | 中国科学院苏州生物医学工程技术研究所 | Multi-wavelength line scans Raman spectrometer |
| CN112290374A (en) * | 2020-09-23 | 2021-01-29 | 北京遥测技术研究所 | Wide tuning semiconductor laser cavity based on multi-channel composite external cavity beam combination |
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