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Multi-wavelength external cavity laser emitter used for inhibiting Raman spectrometer fluorescence

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CN105067114A
CN105067114A CN 201510424163 CN201510424163A CN105067114A CN 105067114 A CN105067114 A CN 105067114A CN 201510424163 CN201510424163 CN 201510424163 CN 201510424163 A CN201510424163 A CN 201510424163A CN 105067114 A CN105067114 A CN 105067114A
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laser
wavelength
output
beams
emitter
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CN 201510424163
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CN105067114B (en )
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张旭婷
蔡志坚
吴建宏
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苏州大学
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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

用于拉曼光谱仪荧光抑制的多波长外腔激光发射装置 External cavity multiwavelength laser Raman spectrometer for fluorescence emission suppressing means

技术领域 FIELD

[0001] 本发明涉及一种外腔激光发射装置,更具体的说,涉及一种用于拉曼光谱仪荧光抑制的多波长外腔激光发射装置。 [0001] The present invention relates to an external cavity laser emitting apparatus, and more particularly, to a multi-wavelength laser-emitting device external cavity Raman spectroscopy for suppressing the fluorescence.

背景技术 Background technique

[0002]目前,拉曼光谱仪在现场检测、毒品分析、农药检测等领域有着非常广泛的应用。 [0002] Currently, Raman spectroscopy detection at the scene, drug analysis, pesticide detection and other fields has a very wide range of applications. 然而,在对农药、毒品、爆炸物等进行检测的过程中,拉曼光谱受到强荧光干扰。 However, in the process of pesticides, drugs, explosives detection, a strong fluorescence interference by Raman spectroscopy. 拉曼光强度远小于荧光强度以至于被荧光淹没从而无法检测到拉曼光谱。 Raman intensity that is much less than the fluorescence intensity of fluorescence can not be detected so submerged Raman spectra. 因此,为了能高效地检测拉曼光谱必须抑制荧光。 Accordingly, in order to efficiently detect fluorescence Raman spectra must be suppressed.

[0003] 现阶段,抑制荧光的方法有很多种,主要采用的是基线校正。 There are a variety of [0003] this stage, fluorescence inhibition method, mainly used in baseline correction. 基线校正即通过特定的算法拟合出光谱图中的荧光背景并将其扣除。 I.e., baseline correction algorithms by fitting specific fluorescence and the background spectrum subtracted. 由于存在拟合误差,基线校正不适用于荧光背景比较复杂的情况,会存在一些人为失真。 Due to the fitting case where error correction is not available for a baseline background fluorescence of the complex, there will be some distortion artificially.

[0004] 相较而言,现有的便携式拉曼光谱仪采用的多波长移频激发法(SEDRS)能够适应在复杂的背景下有效抑制荧光。 [0004] In contrast, the conventional portable multi-wavelength Raman spectrometer using excitation frequency shift method (SEDRS) can be adapted to inhibit the fluorescence in a complex background. 其依据的原理是:由于荧光波长不会随着激发光波长改变而改变,拉曼光谱峰却会发生明显的位移。 Which is based on the principle: fluorescence wavelength as the excitation wavelength does not change due to change, but it will happen Raman spectroscopy peak apparent displacement. 因此,用两个波长相差微小(一长一短)的光分别激发样品获得两组带有荧光背景的拉曼光谱(同一图中),如图1所示;再将两组带有荧光背景的拉曼光谱进行差分即可消除荧光,得到具有“一正一负”的差值拉曼光谱,如图2所示。 Thus, a slight difference between the two wavelengths (a long and short) are light excited Raman spectra of samples obtained with the two fluorescence background (the same figure) shown in Figure 1; then with two fluorescence background Raman spectra can be eliminated differential fluorescence, Raman spectrum obtained with a difference "a positive and negative", as shown in FIG. 最后,利用相关算法复原拉曼光谱。 Finally, the correlation algorithm recovery Raman spectroscopy.

[0005] 多波长移频激发法的关键在于产生多波长拉曼激发光源。 Key [0005] multi-wavelength excitation frequency shift method is to produce a multi-wavelength Raman excitation source. 以双波长拉曼激发光源为例,目前此类光源主要采用可调谐外腔半导体激光器,其利用光栅作为反馈元件,通过转动光栅实现波长调谐。 In an example dual wavelength Raman excitation light source, such light sources currently used mainly tunable external cavity semiconductor laser using a grating as a feedback element, the wavelength tuning achieved by rotating the grating. 如图3所示为目前常见的可调谐外腔半导体激光器示意图,其中激光二极管I输出的光经过准直透镜2入射至光栅3上,一级衍射光反射回激光二极管I中参与模式竞争实现单纵模输出;绕预定支点旋转光栅3—定角度δ,使得入射光的衍射角从图中Θ I变为Θ 2,根据光栅衍射公式“2d.sin Θ = m.λ ”,可知相应的输出波长λ也发生了变化。 As shown in a schematic view of a common external cavity semiconductor laser may be tuned to the present, where the laser diode output I 3 2 passes through the collimating lens 3 incident on the grating, a diffracted light reflected back into the laser diode mode competition involved in single-I longitudinal mode output; 3- grating around a predetermined fulcrum predetermined angle δ, such that the diffraction angle of the incident light from the drawing becomes Θ I Θ 2, a diffraction grating according to the formula "2d.sin Θ = m.λ", found that the corresponding output wavelength λ also changed.

[0006] 改变一级衍射光波长即可实现波长调节。 [0006] wavelength of a diffracted light changes the wavelength adjustment can be realized. 由于存在机械移动部件(光栅3的转动机构),该方案具有调谐结构复杂,稳定性差,输出波长重复性弱、多波长切换精度低,调节繁琐等缺点。 Due to the presence of moving parts (grating rotating mechanism 3), the program has a tuner complex structure, poor stability, repeatability weak output wavelength, multi-wavelength switching accuracy is low, complicated regulation and other shortcomings.

发明内容 SUMMARY

[0007] 本发明目的是:提供一种用于拉曼光谱仪荧光抑制的多波长外腔激光发射装置,其基于移频激发原理,能够克服已知激光发射装置调谐结构复杂,稳定性差,输出波长重复性弱、多波长切换调节不便的缺点。 [0007] The object of the present invention are: to provide a multi-wavelength laser-emitting device external cavity Raman spectrometer for fluorescence suppression, which is based on the principle of shifting the excitation frequency, the complex can overcome the laser emitting apparatus is known tuning structures, poor stability, the output wavelength repeatability is weak, the multi-wavelength switching regulator inconvenient disadvantages.

[0008] 本发明的技术方案是:一种用于拉曼光谱仪荧光抑制的多波长外腔激光发射装置,其特征在于包括: [0008] The aspect of the present invention is: A multi-wavelength laser-emitting device external cavity Raman spectrometer for fluorescence suppression, comprising:

[0009] 准直激光发射组,其包括二个以上的准直激光发射装置,每个准直激光发射装置均包含一激光二极管和一准直透镜,且相邻两个准直激光发射装置发出的准直光束之间预设有夹角δ ; [0009] The collimated laser emitting group including two or more collimated laser emitting apparatus, each of the collimated laser emission devices comprises a laser diode and a collimating lens, and two adjacent collimated laser emitting device emits is preset between the collimated light beam angle [delta];

[0010] 光栅,其布置于前述各准直激光发射装置的准直光束出射路径上构成外腔,各准直光束经该光栅衍射后以不同衍射角形成直接出射的输出光束,以及沿原路返回相应激光二极管内部参与谐振腔内部模式竞争的衍射光束; [0010] grating disposed constituting the outer chamber on the exit path of the collimated light beam preceding collimated laser emitting apparatus, each of the collimated light beam diffracted form an output light beam directly emitted by the grating at different diffraction angles, and along the same route returns the corresponding internal diode laser resonator involved in intra mode competition diffracted beam;

[0011] 光纤合路输出装置,包括光纤親合透镜和光纤合路器,所述光纤親合透镜用于将经由前述光栅出射的输出光束汇聚至光纤合路器进行波长输出; [0011] The optical combiner output means comprises an optical fiber and an affinity lens optical combiner, the optical fiber affinity for converging lens to the optical fiber wavelength multiplexer output via the output beam exiting the grating;

[0012] 控制器,包含连接并驱动各激光二极管独立通断的电源切换电路。 [0012] controller, each comprising a power source connected to and drives the laser diode on and off independently of the switching circuit.

[0013] 进一步的,本发明中所述光栅优选为闪耀光栅,各准直光束经该光栅衍射后均可形成直接出射的零级反射光,以及沿原路返回相应激光二极管内部参与谐振腔内部模式竞争的一级衍射光。 [0013] Further, the present invention is preferably a blazed grating, each of the collimated beam through the diffraction grating can be formed after the zeroth order reflection light is directly emitted, and returns the corresponding laser diode inside the internal cavity along the same route participation order diffracted light mode competition.

[0014] 进一步的,本发明中所述夹角δ满足:0。 [0014] Further, in the present invention, the angle δ satisfies: 0. < δ <10。 <Δ <10. .

[0015] 更进一步的,本发明中所述夹角δ为1°或2°。 [0015] Still further, the present invention, the angle δ is 1 ° or 2 °.

[0016] 进一步的,本发明中所述光纤耦合透镜的数量与激光二极管的数量一致,且每个光纤親合透镜均对应一路所述光栅的输出光束。 [0016] Further, the present invention is consistent with the number of lenses in the optical fiber coupler with the number of laser diodes, and each optical lens corresponds affinity way output beam of the grating.

[0017] 本发明中涉及的连接并驱动各激光二极管独立通断的电源切换电路是本领域技术人员均可实现的已知技术。 [0017] connected to and drives the laser diode on and off independently of the present invention relates to power switching circuits are known in the art skill in the art can be implemented.

[0018] 本发明的工作原理如下: [0018] The working principle of the present invention is as follows:

[0019] 激光二极管和前端的准直透镜确保准直光束的产生。 [0019] The collimator lens and the distal end of the laser diode ensure that a collimated beam. 相对于光栅而言,各激光二极管均是按预设的角度和入射方位排布,每相邻两个激光二极管经准直透镜射出的准直光束之间均存在夹角I而夹角S的存在保证了各准直光束经光栅衍射后具有不同的衍射角Θ。 With respect to the grating, each of the laser diodes are preset incidence angle and azimuth arrangement, the angle I are present between every two adjacent light emitted by the laser diode collimating lens and the angle of the collimated beam of S ensure the presence of each collimated beam by the diffraction gratings having different diffraction angles Θ. 根据光栅衍射公式“2d.sin Θ =m.λ ”,可知当各准直光束的衍射角Θ不同时,其输出波长也不同。 The diffraction grating formula "2d.sin Θ = m.λ", found that when the diffraction angle [Theta] of each collimated beam is not the same, or different output wavelengths.

[0020] 本案中各激光二极管是预先固定的,对于不同波长输出的切换是依靠控制器内的电源切换电路来实现,通过电路的切换使得各激光二极管独立通断,完成各自的波长输出。 [0020] Each laser diode in this case is pre-fixed, different wavelengths for switching the power output of the controller is to rely on the switching circuit is implemented by the switching circuit so that each of the laser diode on and off independently, the output of their respective wavelengths. 当然本案只是拉曼光谱仪的前端激光发射装置,各激光二极管经光栅衍射产生的波长不等的输出光束由光纤合路器收集后,分别激发样品以获得(由拉曼光谱仪内部的感应器检测)多组荧光背景的拉曼光谱,再通过处理器差分运算最终合成出荧光抑制良好的复原拉曼光谱。 Of course, in this case only the front end of the laser emitting apparatus Raman spectrometer, wavelength of each laser diode is diffracted grating of the output beam by the unequal combiner collected after the fiber, respectively, to obtain the samples were excited (detected by the internal sensor of Raman spectroscopy) Raman spectra of a plurality of sets of background fluorescence, and then finally synthesized fluorescence inhibition good recovery Raman spectrum differential operation by the processor.

[0021] 本发明通过合理调节两个准直激光发射装置(激光二极管和准直透镜)的布局角度和入射方位,即改变S角就能够实现最终输出波长的调谐。 [0021] The present invention properly regulate the two collimated laser emitting device (laser diode and the collimator lens) and the incident angle of orientation of the layout, i.e., to change the angle S final tuning can be output wavelength.

[0022] 本发明的优点是: [0022] The advantage of the present invention are:

[0023] 本发明旨在提供一种无机械调节部件的结构更为稳固、输出波长更加稳定,且操作更加简单方便的用于拉曼光谱荧光抑制的多波长外腔激光发射装置。 [0023] The present invention aims to provide a non-mechanical structure modulating member more stable, more stable output wavelength and multi-wavelength operation of external cavity laser emitting apparatus is more easy for the Raman spectrum of the fluorescent suppressed. 本发明相比现有的利用转动式光栅(机械调节部件)实现波长调谐的外腔半导体激光器而言,其具有如下优势: For external cavity semiconductor laser according to the present invention achieves wavelength tuning as compared to using a conventional rotary grating (mechanical regulating member), which has the following advantages:

[0024] I)通过电源切换电路控制实现不同输出波长的切换,无机械调节部件即无需转动光栅,消除了机械调节的不可靠性和可能引入的误差,使得调谐结构更加简单稳固,保证了输出波长的高稳定性,实际操作时波长输出的重复性强,能够大大提高调谐精度; [0024] I) to achieve different output wavelengths by switching power supply switching circuit control, i.e., no mechanical adjustment member without rotating the grating, and eliminates the uncertainty may introduce errors mechanically adjustable, so that the structure is more simple robust tuning, to ensure that the output high wavelength stability, wavelength repeatability of the actual operation of the output intensity, can greatly improve the accuracy of the tuning;

[0025] 2)通过电源切换电路控制实现不同输出波长的切换,可方便、快速切换波长,操作更加简单,能够节约工作时间,提高工作效率; [0025] 2) by the power supply switching circuit controls the switching achieve different output wavelength, easy, fast wavelength switching operation more simple and can save time and improve efficiency;

[0026] 3)通过光栅外腔反馈实现单纵模输出,线宽< 0.2nm。 [0026] 3) feedback to achieve single longitudinal mode output, a line width <0.2nm by a grating external cavity.

[0027] 4)本发明使用同一块光栅给多个激光二极管做反馈,而不是一个光栅对应一个激光二极管,故反馈结构简单,能够节约制造成本。 [0027] 4) The present invention is made using a plurality of laser diodes with a feedback grating, instead of a raster corresponding to a laser diode, a feedback configuration so simple, the manufacturing cost can be saved.

附图说明 BRIEF DESCRIPTION

[0028] 下面结合附图及实施例对本发明作进一步描述: [0028] Example embodiments of the present invention will be further described in conjunction with the accompanying drawings and the following:

[0029]图1为两组波长的激发光未差分前的原始拉曼光谱示意图; [0029] FIG. 1 is a schematic view of the original spectrum before the Raman excitation light is not a difference of two wavelengths;

[0030](图中实线为短波长激发拉曼曲线,虚线为长波长激发拉曼曲线) [0030] (solid line curve short wavelength excitation Raman, Raman excitation wavelength long dashed line curve)

[0031] 图2为图1中两组波长的激发光经差分后获得的差分拉曼光谱图; [0031] FIG. 2 is a difference in the Raman spectra of FIG. 1 FIG two wavelength excitation light is obtained from the difference;

[0032] 图3为现有的可调谐外腔半导体激光器示意图; [0032] FIG. 3 is a schematic view of a conventional semiconductor laser tunable external cavity;

[0033] 图4为本发明的结构示意图: [0033] FIG. 4 is a schematic structural diagram of the present invention:

[0034] 图中:1、激光二极管;2、准直透镜;3、光栅;4、光纤親合透镜;5、光纤合路器;6、 [0034] FIG: 1, a laser diode; 2, a collimator lens; 3, grating; 4, fiber affinity lens; 5, optical combiner; 6,

控制器。 Controller.

具体实施方式 detailed description

[0035] 实施例:结合图4所示为本发明用于拉曼光谱仪荧光抑制的多波长外腔激光发射装置的一种具体实施例,具体的说它是一种双波长外腔激光发射装置,由准直激光发射组、光栅、光纤合路输出装置和控制器共同组成。 [0035] Example: As shown in conjunction with FIG. 4 of the present invention is applied to a multi-wavelength laser-emitting device external cavity Raman spectroscopy Fluorescence in specific embodiments, it is specifically a two-wavelength laser-emitting device external cavity , laser light emitted by the collimator set, a grating, and the optical combiner output means together constitute a controller.

[0036] 本实施例中的准直激光发射组由二个准直激光发射装置组成,每个准直激光发射装置均由一激光二极管I和一设置在激光二极管I前端的准直透镜2构成,且相邻两个准直激光发射装置发出的准直光束之间预设有夹角δ,0° < δ <10°,通常设置为1°或 [0036] The present collimating laser light emitted by the group in the embodiment two collimated laser emitting apparatus, each of collimated laser by a laser diode emitting device I and a collimator lens disposed on the distal end of the laser diode 2 constituting the I , and the adjacent two predetermined angle [delta] with a collimated light beam between the emitting device emits the collimated laser, 0 ° <δ <10 °, typically set to 1 ° or

2° ο 2 ° ο

[0037] 本实施例中所述光栅3采用的是反射式衍射的闪耀光栅,其布置于前述两个准直激光发射装置的准直光束出射路径上构成外腔,各准直光束经该光栅3衍射后以不同衍射角形成直接出射的零级反射光,以及沿原路返回相应激光二极管I内部参与谐振腔内部模式竞争的一级衍射光。 [0037] In this embodiment the grating 3 is used in a reflective blazed diffraction grating, which is arranged in the external cavity configuration on the exit path of the two collimated beams collimated laser emitting apparatus, each of the collimated beam through the grating 3 after formation of the zero-order diffracted reflected light directly emitted at different diffraction angles, and returns along the same route I participate respective internal laser diode cavity inside a diffracted light mode competition.

[0038] 本实施例中所述光纤合路输出装置由光纤耦合透镜4和光纤合路器5构成,所述光纤耦合透镜4用于将经由前述光栅3出射的零级反射光束汇聚至光纤合路器5 (Y型光纤)进行波长输出;所述光纤耦合透镜4的数量也为两个,每个光纤耦合透镜4均对应一路所述光栅3的零级反射光束。 [0038] The present embodiment the optical combiner output device in the embodiment is constituted by an optical fiber coupling lens optical combiner 4 and 5, the optical fiber coupling lens 4 to the optical fiber for converging bonded via the grating zero order reflected light beam 3 emitted circuit-5 (Y type fiber) wavelength output; the number of the optical fiber coupling lens 4 is also two, each optical fiber coupling lens 4 corresponds to the grating 3 along the zero order reflected light beam.

[0039] 本实施例中所述控制器6内部设有连接并驱动各激光二极管I独立通断的电源切换电路。 [0039] In the present embodiment, the controller 6 is provided inside each of the laser diode is connected to drive off the I independent power supply switching circuit.

[0040] 本发明的工作原理如下: [0040] The working principle of the present invention is as follows:

[0041] 激光二极管I和前端的准直透镜2确保准直光束的产生。 [0041] I and the front end of the laser diode collimator lens 2 ensure that a collimated beam. 相对于光栅3而言,各激光二极管I均是按预设的角度和入射方位排布,本实施例中相邻两个激光二极管I经准直透镜2射出的准直光束之间存在夹角δ,而夹角δ的存在保证了各准直光束经光栅3衍射后具有不同的衍射角Θ,即图4中Θ#Ρ Θ 2,根据光栅衍射公式“2d.sin Θ =m.λ”,可知当各准直光束的衍射角Θ不同时,其输出波长λ也不同。 With respect to the grating 3, the respective laser diode I are preset incidence angle and azimuth arrangement, two laser diodes via the I beam between the collimator lens 2 emitted from the collimator present embodiment according to the present embodiment, the angle between adjacent δ, the angle [delta] to ensure the presence of each of the collimated beam after diffraction grating 3 have different diffraction angles Θ, i.e., FIG. 4 Θ # Ρ Θ 2, a diffraction grating according to the formula "2d.sin Θ = m.λ" , found that when the diffraction angle Θ of each collimated beam is not the same, or different output wavelength λ.

[0042] 本案中各激光二极管I是预先固定的,对于不同波长输出的切换是依靠控制器6内的电源切换电路来实现,通过电路的切换使得各激光二极管I独立通断,完成各自的波长输出。 [0042] Each laser diode in this case I is fixed in advance, for the switching of different output wavelengths in the controller is to rely on the power supply switching circuit 6 is implemented by the switching circuit so that each of the laser diode on and off independently I, of their respective wavelength output. 当然本案只是拉曼光谱仪的前端激光发射装置,各激光二极管I经光栅3衍射产生的波长不等的输出光束由光纤合路器5收集后,分别激发样品以获得(由拉曼光谱仪内部的感应器检测)两组荧光背景的拉曼光谱(可参见图1所示),最后通过处理器差分运算合成获得荧光抑制良好的拉曼光谱(可参见图2所示)。 Of course, in this case only the front end of the laser emitting apparatus Raman spectrometer, the wavelength of the respective laser diodes by varying I output beam produced by a diffraction grating 3 after the collection fiber combiner 5, respectively, to obtain the samples were excited (induced by the inside of the Raman spectrometer detection) two fluorescence background Raman spectrum (see FIG. 1), and finally by a processor to suppress fluorescence differential operation to obtain a good synthetic Raman spectrum (see FIG. 2).

[0043] 本发明通过合理调节两个准直激光发射装置(激光二极管I和准直透镜2)的布局角度和入射方位,即改变S角就能够实现最终输出波长的调谐。 [0043] The present invention properly regulate the two collimated laser emitting device (laser diode and the collimator lens 2 I) and the incident angle of orientation of the layout, i.e., to change the angle S final tuning can be output wavelength.

[0044]当然上述实施例只为说明本发明的技术构思及特点,其目的在于让熟悉此项技术的人能够了解本发明的内容并据以实施,并不能以此限制本发明的保护范围。 [0044] Of course, the above-described embodiment, for explaining the technical concept and features of the invention, its object is to only allow the person skilled in the art to understand the present invention and to the scope of embodiments, and not limit the present invention in this data. 凡根据本发明主要技术方案的精神实质所做的修饰,都应涵盖在本发明的保护范围之内。 Where a modification made to the spirit of the main aspect of the present invention, should fall within the scope of the present invention.

Claims (5)

1.一种用于拉曼光谱仪荧光抑制的多波长外腔激光发射装置,其特征在于包括: 准直激光发射组,其包括二个以上的准直激光发射装置,每个准直激光发射装置均包含一激光二极管(I)和一准直透镜(2),且相邻两个准直激光发射装置发出的准直光束之间预设有夹角δ ; 光栅(3),其布置于前述各准直激光发射装置的准直光束出射路径上构成外腔,各准直光束经该光栅(3)衍射后以不同衍射角形成直接出射的输出光束,以及沿原路返回相应激光二极管(I)内部参与谐振腔内部模式竞争的衍射光束; 光纤合路输出装置,包括光纤親合透镜(4)和光纤合路器(5),所述光纤親合透镜(4)用于将经由前述光栅(3)出射的输出光束汇聚至光纤合路器(5)进行波长输出; 控制器¢),包含连接并驱动各激光二极管(I)独立通断的电源切换电路。 External cavity multiwavelength laser emitting apparatus 1. A Raman spectroscopy for suppressing the fluorescence, characterized by comprising: a collimated laser emitting group including two or more collimated laser emitting apparatus, each of the collimated laser emitting means contains a laser diode (I) and a collimating lens (2), and is preset angle δ between adjacent collimated beams two collimated laser emitting device emitted; grating (3), which is disposed in the each collimated laser emitting apparatus collimated beam constituting the outer chamber on the radio path, each of the collimated beam (3) after the diffraction form an output light beam directly emitted by the grating at different diffraction angles, and returns the corresponding laser diode along the same route (I ) involved in internal mode diffracted beam competitive internal cavity; optical combiner output means comprises an optical fiber affinity lens (4) and optical combiners (5), the optical fiber affinity lens (4) for the raster via (3) the output beam emitted converged to the fiber combiner (5) for outputting wavelength; ¢ controller), connected to and drives each comprising a laser diode (I) is an independent power supply switching circuit off.
2.根据权利要求1所述的用于拉曼光谱仪荧光抑制的多波长外腔激光发射装置,其特征在于所述光栅(3)为闪耀光栅,各准直光束经该光栅(3)衍射后均可形成直接出射的零级反射光,以及沿原路返回相应激光二极管(I)内部参与谐振腔内部模式竞争的一级衍射光。 The external cavity multiwavelength laser emitting means for inhibiting Raman spectroscopy of fluorescence according to claim 1, wherein said grating (3) is a blazed grating, each of the collimated beam (3) by the diffraction gratings zero order reflected light can be formed directly emitted, and returns along the same route the corresponding laser diode (I) involved in an internal cavity inside diffracted light mode competition.
3.根据权利要求1或2所述的用于拉曼光谱仪荧光抑制的多波长外腔激光发射装置,其特征在于所述夹角δ满足:0° < δ < 10°。 The external cavity multiwavelength laser emitting means for inhibiting Raman spectroscopy or fluorescence according to claim 12, wherein said angle [delta] satisfies: 0 ° <δ <10 °.
4.根据权利要求1所述的用于拉曼光谱仪荧光抑制的多波长外腔激光发射装置,其特征在于所述光纤耦合透镜(4)的数量与激光二极管(I)的数量一致,且每个光纤耦合透镜(4)均对应一路所述光栅(3)的输出光束。 The external cavity multiwavelength laser emitting means for inhibiting Raman spectroscopy the fluorescence of claim 1, characterized in that the same number of the optical fiber coupling lens (4) to the laser diode (I), and each optical fiber coupling lens (4) (3) corresponding to each output beam along said grating.
5.根据权利要求3所述的用于拉曼光谱仪荧光抑制的多波长外腔激光发射装置,其特征在于所述夹角δ为Γ或2°。 The external cavity multiwavelength laser emitting means for inhibiting Raman spectroscopy the fluorescence according to claim 3, wherein said angle δ is Γ or 2 °.
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