CN204854960U - A multi -wavelength exocoel laser emission device for raman spectrometer fluorescence restraines - Google Patents
A multi -wavelength exocoel laser emission device for raman spectrometer fluorescence restraines Download PDFInfo
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- CN204854960U CN204854960U CN201520522053.XU CN201520522053U CN204854960U CN 204854960 U CN204854960 U CN 204854960U CN 201520522053 U CN201520522053 U CN 201520522053U CN 204854960 U CN204854960 U CN 204854960U
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Abstract
The utility model discloses a multi -wavelength exocoel laser emission device for raman spectrometer fluorescence restraines, its characterized in that passes through power supply switching circuit and connects and drive the independent break -make of laser diode more than two, and each laser diode all through corresponding collimating lens output collimated beam, has predetermine contained angle delta between the adjacent collimated beam. These collimated beams are final all through forming the output beam of direct outgoing and the diffracted beam that yan yuanlu returned the inside mode competition of the inside participation resonant cavity of corresponding laser diode with different diffraction angles behind the same grating diffraction, the output beam carries out wavelength output after the fiber optic coupling lens assemble to the optic fibre combiner. The utility model discloses a circuit switches wavelength output, has eliminated the unreliability of conventional mechanical conditioning and the error of probably introducing for harmonious structure is more simply firm, has guaranteed the high stability of output wavelength, and the repeatability of wavelength output is strong during actual operation, can improve harmonious precision greatly.
Description
Technical field
The utility model relates to a kind of external cavity laser emitter, in particular, relates 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 utility model object is: provide a kind of multi-wavelength external cavity laser emitter for Raman spectrometer Control of Fluorescence, 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.
The technical solution of the utility model 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 utility model, 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 utility model meets: 0 ° of < δ < 10 °.
Further, the δ of angle described in the utility model is 1 ° or 2 °.
Further, the quantity of fiber coupling lens described in the utility model 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 utility model 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 utility model 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 utility model 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.
The utility model has the advantages that:
The utility model 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 utility model 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 utility model use same grating does to multiple laser diode and feeds back, 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 utility model is 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 utility model:
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 utility model 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 utility model 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 utility model 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 utility model and feature are described, its object is to person skilled in the art can be understood content of the present utility model and implement according to this, can not limit protection domain of the present utility model with this.All modifications done according to the Spirit Essence of the utility model main technical schemes, all should be encompassed within protection domain of the present utility model.
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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| Application Number | Priority Date | Filing Date | Title |
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| CN201520522053.XU CN204854960U (en) | 2015-07-17 | 2015-07-17 | A multi -wavelength exocoel laser emission device for raman spectrometer fluorescence restraines |
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| CN201520522053.XU CN204854960U (en) | 2015-07-17 | 2015-07-17 | A multi -wavelength exocoel laser emission device for raman spectrometer fluorescence restraines |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105067114A (en) * | 2015-07-17 | 2015-11-18 | 苏州大学 | Multi-wavelength external cavity laser emitter used for inhibiting Raman spectrometer fluorescence |
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2015
- 2015-07-17 CN CN201520522053.XU patent/CN204854960U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105067114A (en) * | 2015-07-17 | 2015-11-18 | 苏州大学 | Multi-wavelength external cavity laser emitter used for inhibiting Raman spectrometer fluorescence |
| CN105067114B (en) * | 2015-07-17 | 2017-12-19 | 苏州大学 | Multi-wavelength external cavity laser emitter for Raman spectrometer Control of Fluorescence |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20151209 Effective date of abandoning: 20171219 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20151209 Effective date of abandoning: 20171219 |