CN105067114B - Multi-wavelength external cavity laser emitter for Raman spectrometer Control of Fluorescence - Google Patents
Multi-wavelength external cavity laser emitter for Raman spectrometer Control of Fluorescence Download PDFInfo
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- CN105067114B CN105067114B CN201510424163.7A CN201510424163A CN105067114B CN 105067114 B CN105067114 B CN 105067114B CN 201510424163 A CN201510424163 A CN 201510424163A CN 105067114 B CN105067114 B CN 105067114B
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Abstract
The invention discloses a kind of multi-wavelength external cavity laser emitter for Raman spectrometer Control of Fluorescence, it is characterized in that connected by power supply switch circuit and drive the laser diode independence break-make of more than two, each laser diode exports collimated light beam by corresponding collimation lens, and angle δ is preset between adjacent collimated light beam.The output beam and the diffracted beam along participation intra resonant cavity mode competition inside backtracking respective laser diodes that these collimated light beams are finally directly emitted by being formed after same optical grating diffraction with different diffraction angle；The output beam most converges to optical fiber combiner through fiber coupling lens afterwards and carries out wavelength output.The present invention is exported using circuit wavelength switching, the error that eliminates the unreliability of conventional mechanical regulation and may introduce so that tuning structure is simpler firm, ensure that the high stability of output wavelength, the repeatability that wavelength exports during practical operation is strong, can greatly improve tuning precision.
Description
Technical field
The present invention relates to a kind of external cavity laser emitter, in particular, is related to one kind and is used for Raman spectrometer fluorescence
The multi-wavelength external cavity laser emitter of suppression.
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.
However, during being detected to agricultural chemicals, drugs, explosive etc., Raman spectrum is disturbed by hyperfluorescence.Raman luminous intensity
Much smaller than fluorescence intensity so that being flooded by fluorescence so as to which Raman spectrum can not be detected.Therefore, in order to efficiently detecting drawing
Graceful spectrum must suppress fluorescence.
At this stage, suppressing the method for fluorescence has many kinds, mainly using baseline correction.Baseline correction is i.e. by specific
Algorithm fit the fluorescence background in spectrogram and deducted.Due to error of fitting be present, baseline correction is not suitable for glimmering
The more complicated situation of light background, there can be some artificial distortions.
In contrast, the multi-wavelength shift frequency excitation method (SEDRS) that existing Portable Raman spectrometer uses can adapt to
Effectively suppress fluorescence under the background of complexity.The principle of its foundation is：Because wavelength of fluorescence will not change with excitation wavelength
And change, obvious displacement can but occur for Raman spectral peaks.Therefore, the light for small (one is long and the other is short) being differed with two wavelength is distinguished
Sample is excited to obtain two groups of Raman spectrums (in same figure) for carrying fluorescence background, as shown in Figure 1；Two groups are carried on the back with fluorescence again
The Raman spectrum of scape, which carries out difference, can eliminate fluorescence, the difference Raman spectrum with " one positive one is negative ", as shown in Figure 2.
Finally, Raman spectrum is restored using related algorithm.
The key of multi-wavelength shift frequency excitation method is to produce wavelength Raman excitation source.With dual wavelength Raman excitation light source
Exemplified by, current such light source mainly uses Tunable External Cavity Semiconductor Laser, and it is by the use of grating as feedback element, by turning
Dynamic grating realizes wavelength tuning.It is illustrated in figure 3 Tunable External Cavity Semiconductor Laser schematic diagram common at present, wherein laser
The light that diode 1 exports is incident on grating 3 by collimation lens 2, and first-order diffraction light is reflected back in laser diode 1 and participates in mould
Formula competition realizes that single longitudinal mode exports；Around the predetermined certain angle δ of fulcrum rotating grating 3 so that the angle of diffraction of incident light θ from figure1
It is changed into θ2, according to optical grating diffraction formula " 2dsin θ=m λ ", it is known that corresponding output wavelength λ is also changed.
Change first-order diffraction optical wavelength and wavelength regulation can be achieved.Due to the mechanical displacement means (rotating machine of grating 3 be present
Structure), the program has tuning structure complicated, and stability is poor, and output wavelength repeatability is weak, multi-wavelength switching precision is low, and regulation is numerous
The shortcomings of trivial.
The content 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, and known laser emitter tuning structure can be overcome complicated, and stability is poor, and output wavelength repeats
Property the switching regulation of weak, multi-wavelength it is inconvenient the shortcomings that.
The technical scheme is that：A kind of multi-wavelength external cavity laser for Raman spectrometer Control of Fluorescence launches dress
Put, it is characterised in that including：
Collimation laser transmitting group, it includes the collimation laser emitter of more than two, each collimation laser emitter
Include a laser diode and collimating lens, and it is pre- between the collimated light beam that sends of two neighboring collimation laser emitter
Provided with angle δ；
Grating, it is arranged on the collimated light beam exit path of foregoing each collimation laser emitter and forms exocoel, each standard
Collimated optical beam forms the output beam being directly emitted after the optical grating diffraction with different diffraction angle, and along the corresponding laser of backtracking
The diffracted beam of intra resonant cavity mode competition is participated in inside diode；
Optical fiber combining output device, including fiber coupling lens and optical fiber combiner, the fiber coupling lens are used for will
The output beam being emitted via foregoing grating converges to optical fiber combiner and carries out wavelength output；
Controller, comprising connecting and drive the power supply switch circuit of each laser diode independence break-make.
Further, heretofore described grating is preferably balzed grating, and each collimated light beam is after the optical grating diffraction
The zero order light reflected being directly emitted is formed, and it is competing along participation intra resonant cavity pattern inside backtracking respective laser diodes
The first-order diffraction light striven.
Further, heretofore described angle δ meets：0 ° of 10 ° of ＜ δ ＜.
Further, heretofore described angle δ is 1 ° or 2 °.
Further, the quantity of heretofore described fiber coupling lens and the quantity of laser diode are consistent, and each
Fiber coupling lens correspond to the output beam of grating described all the way.
The connection that is related in the present invention and power supply switch circuit for driving each laser diode independence break-make is this area skill
The achievable known technology of art personnel.
The operation principle of the present invention is as follows：
Laser diode and the collimation lens of front end ensure the generation of collimated light beam.For grating, each laser two
Pole pipe is the collimated light that collimated lens project per two neighboring laser diode by default angle and incident orientation arrangement
Angle δ between beam be present, and angle δ presence ensure that each collimated light beam has different diffraction angles after optical grating diffraction.
According to optical grating diffraction formula " 2dsin θ=m λ ", it is known that when the diffraction angle difference of each collimated light beam, its output wavelength
It is different.
Each laser diode is fixed in advance in this case, for different wave length output switching by controller
Power supply switch circuit is realized, by the switching of circuit each laser diode independence break-make, completes respective wavelength output.
Certain this case is the front end laser beam emitting device of Raman spectrometer, and each laser diode is through wavelength caused by optical grating diffraction
Output beam by optical fiber combiner collect after, excite sample respectively with obtain (by inside Raman spectrometer inductor detect)
The Raman spectrum of multigroup fluorescence background, then the good recovery Raman light of Control of Fluorescence is finally synthesized by processor calculus of differences
Spectrum.
The layout angle that the present invention passes through two collimation laser emitters of reasonable adjusting (laser diode and collimation lens)
Degree and incident orientation, that is, change the tuning that δ angles can be realized as final output wavelength.
It is an advantage of the invention that：
The present invention is intended to provide a kind of structure without mechanical regulating member is more firm, output wavelength is more stable, and grasp
Make the simpler multi-wavelength external cavity laser emitter for being conveniently used for Raman spectrum Control of Fluorescence.The present invention is compared to existing
For realizing the ECLD of wavelength tuning using rotary type grating (mechanical adjustment part), it has following excellent
Gesture：
1) switching of different output wavelengths is realized by power supply switch circuit control, without mechanical regulating member i.e. without rotating
Grating, the error that eliminates the unreliability of mechanical adjustment and may introduce so that tuning structure is simpler firm, ensure that
The high stability of output wavelength, the repeatability of wavelength output is strong during practical operation, can greatly improve tuning precision；
2) switchings of different output wavelengths is realized by power supply switch circuit control, can easily and fast wavelength switching, operation
It is simpler, it can save the working time, improve operating efficiency；
3) realize that single longitudinal mode exports by grating external-cavity feedback, line width ＜ 0.2nm.
4) present invention is done using same grating to multiple laser diodes feeds back, rather than corresponding one an of grating swashs
Optical diode, therefore feedback arrangement is simple, can save manufacturing cost.
Brief description of the drawings
Below in conjunction with the accompanying drawings and embodiment 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；
(solid line is that short wavelength excites Raman curve in figure, 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 the structural representation of the present invention：
In figure：1st, laser diode；2nd, collimation lens；3rd, grating；4th, fiber coupling lens；5th, optical fiber combiner；6th, control
Device processed.
Embodiment
Embodiment：The present invention is shown with reference to Fig. 4 for the multi-wavelength external cavity laser of Raman spectrometer Control of Fluorescence to launch
A kind of specific embodiment of device, specifically it is a kind of dual wavelength external cavity laser emitter, by collimation laser transmitting group,
Grating, optical fiber combining output device and controller collectively constitute.
Collimation laser transmitting group in the present embodiment is made up of two collimation laser emitters, each collimation laser transmitting
Device is formed by a laser diode 1 and a collimation lens 2 for being arranged on the front end of laser diode 1, and two neighboring collimation
Angle δ is preset between the collimated light beam that laser beam emitting device is sent, 0 ° of 10 ° of ＜ δ ＜, is usually arranged as 1 ° or 2 °.
For grating 3 described in the present embodiment using the balzed grating, of reflective diffraction, it is arranged in both of the aforesaid collimation
Exocoel is formed on the collimated light beam exit path of laser beam emitting device, each collimated light beam is after the diffraction of grating 3 with different diffraction
Angle forms the zero order light reflected being directly emitted, and participates in intra resonant cavity mould along the inside of backtracking respective laser diodes 1
The first-order diffraction light of formula competition.
The output device of optical fiber combining described in the present embodiment is made up of fiber coupling lens 4 and optical fiber combiner 5, the light
Fine coupled lens 4 are used to via the zero order light reflected beam convergence that foregoing grating 3 is emitted to optical fiber combiner 5 (y-type optical fiber) to enter
Traveling wave length output；The quantity of the fiber coupling lens 4 is also two, and each fiber coupling lens 4 correspond to light described all the way
The zero order reflection light beam of grid 3.
It is provided with inside controller 6 described in the present embodiment and connects and drive the power supply of each 1 independent break-make of laser diode to cut
Change circuit.
The operation principle of the present invention is as follows：
Laser diode 1 and the collimation lens of front end 2 ensure the generation of collimated light beam.For grating 3, each laser
Diode 1 is arranged by default angle and incident orientation, two neighboring 1 collimated lens of laser diode in the present embodiment
Angle δ between 2 collimated light beams projected be present, and angle δ presence ensure that each collimated light beam has not after the diffraction of grating 3
With diffraction angle, i.e. θ in Fig. 41And θ2, according to optical grating diffraction formula " 2dsin θ=m λ ", it is known that when each collimated light beam
During diffraction angle difference, its output wavelength λ is also different.
Each laser diode 1 is fixed in advance in this case, and the switching for different wave length output is by controller 6
Power supply switch circuit realize, by each 1 independent break-make of laser diode of the switching of circuit, it is defeated to complete respective wavelength
Go out.Certain this case is the front end laser beam emitting device of Raman spectrometer, and each laser diode 1 is through ripple caused by the diffraction of grating 3
After the long output beam not waited is collected by optical fiber combiner 5, sample is excited respectively to obtain (by the sensing inside Raman spectrometer
Device detects) Raman spectrums (reference can be made to shown in Fig. 1) of two groups of fluorescence backgrounds, obtained finally by the synthesis of processor calculus of differences glimmering
The good Raman spectrum of Xanthophyll cycle (reference can be made to shown in Fig. 2).
The layout that the present invention passes through two collimation laser emitters of reasonable adjusting (laser diode 1 and collimation lens 2)
Angle and incident orientation, that is, change the tuning that δ angles can be realized as final output wavelength.
Certainly the above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow be familiar with technique
People can understand present disclosure and implement according to this, it is not intended to limit the scope of the present invention.It is all according to this hair
The modification that the Spirit Essence of bright main technical schemes is done, it should all be included within the scope of the present invention.
Claims (4)
- A kind of 1. multi-wavelength external cavity laser emitter for Raman spectrometer Control of Fluorescence, it is characterised in that including：Collimation laser transmitting group, it includes the collimation laser emitter of more than two, and each collimation laser emitter wraps Containing a laser diode (1) and collimating lens (2), and between the collimated light beam that sends of two neighboring collimation laser emitter It is preset with angle δ；Grating (3), it is arranged on the collimated light beam exit path of foregoing each collimation laser emitter and forms exocoel, each collimation Light beam forms the output beam being directly emitted after grating (3) diffraction with different diffraction angle, and mutually stress along backtracking The diffracted beam of intra resonant cavity mode competition is participated in inside optical diode (1)；Optical fiber combining output device, including fiber coupling lens (4) and optical fiber combiner (5), the fiber coupling lens (4) are used Wavelength output is carried out in the output beam being emitted via foregoing grating (3) is converged into optical fiber combiner (5)；The fiber coupling The quantity of lens (4) is consistent with the quantity of laser diode (1), and each fiber coupling lens (4) correspond to light described all the way The output beam of grid (3)；Controller (6), comprising connecting and drive the power supply switch circuit of each laser diode (1) independent break-make；The presence of the angle δ ensure that each collimated light beam has different diffraction angles after optical grating diffraction, according to optical grating diffraction Formula " 2dsin θ=m λ ", it is known that when the diffraction angle difference of each collimated light beam, final output wavelength is also different.
- 2. the multi-wavelength external cavity laser emitter according to claim 1 for Raman spectrometer Control of Fluorescence, it is special Sign is that the grating (3) is balzed grating, and each collimated light beam can form the zero level being directly emitted after grating (3) diffraction Reflected light, and the first-order diffraction light along participation intra resonant cavity mode competition inside backtracking respective laser diodes (1).
- 3. the multi-wavelength external cavity laser emitter according to claim 1 or 2 for Raman spectrometer Control of Fluorescence, its It is characterised by that the angle δ meets：0 ° of 10 ° of ＜ δ ＜.
- 4. the multi-wavelength external cavity laser emitter according to claim 3 for Raman spectrometer Control of Fluorescence, it is special Sign is that the angle δ is 1 ° or 2 °.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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 |
| CN113495331A (en) * | 2020-03-18 | 2021-10-12 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| 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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| 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 |
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| US20030193974A1 (en) * | 2002-04-16 | 2003-10-16 | Robert Frankel | Tunable multi-wavelength laser device |
| US8553221B2 (en) * | 2006-10-24 | 2013-10-08 | Pd-Ld, Inc. | Compact, low cost Raman monitor for single substances |
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Patent Citations (4)
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| US6192062B1 (en) * | 1998-09-08 | 2001-02-20 | Massachusetts Institute Of Technology | Beam combining of diode laser array elements for high brightness and power |
| 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 |
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