CN114400500A - Laser external modulation transverse mode generating device - Google Patents
Laser external modulation transverse mode generating device Download PDFInfo
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- CN114400500A CN114400500A CN202111622487.3A CN202111622487A CN114400500A CN 114400500 A CN114400500 A CN 114400500A CN 202111622487 A CN202111622487 A CN 202111622487A CN 114400500 A CN114400500 A CN 114400500A
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- H—ELECTRICITY
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- 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
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/065—Mode locking; Mode suppression; Mode selection ; Self pulsating
- H01S5/0651—Mode control
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- H01S5/0655—Single transverse or lateral mode emission
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Abstract
The invention discloses a laser external modulation transverse mode generating device, which comprises: the laser system comprises a laser light source and an indicating light source, and the two light sources are matched and adjusted by two spectroscopes to realize coaxial output; the inclination control system introduces inclination aberration to the incident laser to influence the incident laser mode and realize inclination control outside the modulation cavity; the external modulation cavity system is a folding passive resonant cavity consisting of a plane cavity mirror and two plane concave cavity mirrors, resonates injected laser, adjusts the plane concave cavity mirror arranged on the four-dimensional adjustable inclined mirror bracket and the plane cavity mirror arranged on the embedded rotary mounting seat, and realizes the matching of an incident laser mode and a transverse mode of an eigenmode of the passive cavity; the transverse mode monitoring system comprises a focusing lens, a high-speed photoelectric detector and a CCD camera, wherein the photoelectric detector and the camera respectively monitor an optical cavity output signal and a light spot distribution mode of a light beam transmitted by a passive cavity after being focused by the lens. The invention has wider adjustment range, more laser mode orders and various high-order transverse mode modes.
Description
Technical Field
The invention relates to the technical field of cavity ring-down, in particular to a laser external modulation transverse mode generating device.
Background
The cavity ring-down technology is an optical detection technology based on a high-precision passive resonant cavity, and is widely applied to the fields of absorption spectrum measurement, high reflectivity measurement, optical fiber sensing and the like at present. (Abhijit Maity, Sanchi Maithani, Manik Pradhan, "Cavity ring-down Spectroscopy: recent technical enhancements and applications", Molecular and Laser Spectroscopy, 2020, 83-120; Licheng, Gong cell; overview of optical Cavity ring-down high reflectance measurement techniques, Advances in Laser and optoelectronics, 2010, 47: 021203). The stable field distribution of the electromagnetic field in the cavity existing in the transverse x-y plane perpendicular to its propagation direction z is called transverse mode. Different transverse modes correspond to different laterally stable optical field distributions and frequencies. According to the mode coupling theory, under certain conditions, when a laser beam is injected into the passive resonant cavity, the intrinsic transverse mode of the passive resonant cavity is excited. When the passive cavity is free of detuning, the incident laser beam will typically excite a fundamental transverse mode in the cavity. When cavity parameters of the passive cavity, such as cavity mirror inclination, cavity axis deviation and the like, are mismatched, a high-order transverse mode and even a plurality of transverse modes can be excited in the cavity. The traditional method can only generate an extra-cavity high-order transverse mode by tilting the cavity mirror of the resonant cavity, has fewer adjustable elements and limited adjustment range, obtains a smaller order of a high-order mode, and generates a limited variety of complex high-order modes. The invention provides a laser external modulation transverse mode generating device based on early experimental observation and theoretical research. The principle of the device is as follows: the passive cavity transmission light spot distribution mode is the result of matching coupling of the incident laser mode and the passive cavity eigenmode, so that the finally excited passive cavity transmission light spot distribution mode can be changed by influencing the incident laser mode or adjusting the passive cavity eigenmode. By introducing a tilt control system outside the passive cavity and a mode of modulating the tilt and the rotation angle of the cavity mirror in the passive cavity, an incident laser mode and an intrinsic mode of the passive cavity can be flexibly adjusted, and laser transverse modes and even multiple transverse modes in different order modes can be generated.
Therefore, the device of the invention utilizes the photoelectric detector and the CCD camera to monitor the optical cavity output signal and the light spot distribution mode transmitted by the passive cavity respectively through the combined regulation and control of the inclination inside and outside the laser external modulation cavity system and the mode of rotating the plane cavity mirror, and can realize the flexible generation of transverse modes with different order modes and different nodal line expansion directions of the laser external modulation. Compared with the traditional method, the method has the advantages of no change of a laser source, wide adjustment range, more transverse mode orders, various high-order mode types, simplicity and convenience in operation and the like.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the traditional method can only generate an extra-cavity high-order transverse mode by tilting the cavity mirror of the resonant cavity, has fewer adjustable elements and limited adjustment range, obtains a smaller order of a high-order mode, and generates a limited variety of complex high-order modes. Aiming at the problem, the invention provides a laser external modulation transverse mode generating device which is carried out in a mode of combining passive intra-cavity and external-tilt regulation and rotating a plane cavity mirror, and can effectively widen the regulation range and obtain more transverse mode orders and various high-order modes.
The technical scheme adopted by the invention to solve the technical problem is as follows: a laser external modulation transverse mode generating device, comprising: the device comprises a laser light source, an indicating light source, a light splitting reflector, a plane reflector, an inclination control system, a plane cavity mirror, a first plano-concave high-reflection cavity mirror, a second plano-concave high-reflection cavity mirror, a first focusing lens, a second focusing lens, a photoelectric detector, a CCD camera and a computer; invisible light output by the laser light source is coaxially output with the visible indication light source reflected by the plane mirror after passing through the light splitting mirror, an output light beam is modulated by an inclined aberration introduced by the inclination control system and then injected into a folding passive cavity consisting of the plane mirror, a first plano-concave high-reflection mirror and a second plano-concave high-reflection mirror, an optical cavity output signal transmitted by the passive cavity is collected by a photoelectric detector after being focused by a first focusing lens, and a light spot distribution mode transmitted by the passive cavity is monitored by a CCD camera after being focused by a second focusing lens and then is displayed on a computer display in a laser transverse mode.
The laser light source is a continuous wave semiconductor laser with narrow line width.
The tilt control system can be a tilt deformable mirror, or a transmissive liquid crystal spatial light modulator, or a filter wheel with multiple tilt aberrators.
The first plano-concave high-reflection cavity mirror and the second plano-concave high-reflection cavity mirror are arranged on the four-dimensional adjustable inclined mirror frame, so that the first plano-concave high-reflection cavity mirror and the second plano-concave high-reflection cavity mirror can be adjusted in the horizontal direction and the vertical direction to generate cavity mirror inclination misalignment, and can also be adjusted in the vertical direction and the left direction to generate cavity axis deviation misalignment.
The tilt control system, the first plano-concave high-reflection cavity mirror and the second plano-concave high-reflection cavity mirror can be adjusted in a matched mode, combined regulation and control of the tilt inside and outside the passive cavity is formed, and flexible generation of laser transverse modes in different order modes is achieved.
The plane cavity mirror is arranged in the embedded rotary mounting seat, and the rotation angle can be adjusted in the cross section perpendicular to the light propagation direction, so that the angle of the laser high-order transverse mode nodal line in the expansion direction is regulated and controlled, and the flexible generation of the laser high-order transverse modes in different nodal line expansion directions is realized.
The principle of the invention is as follows: according to the invention, based on a laser mode coupling theory, a modulation cavity is built outside a laser light source to form a composite cavity together with a resonant cavity of a laser, an inclination control system is introduced to influence an incident laser mode, a passive cavity mirror mounted on a four-dimensional adjustable mirror frame is adjusted to change an intrinsic mode of the passive cavity, the matching coupling result of the incident laser mode and the intrinsic mode of the passive cavity can be changed by the way of the combined regulation and control of the inclination inside and outside the passive cavity and the rotation of a plane cavity mirror, laser transverse mode modes with different orders and different nodal line expansion directions are excited in the cavity, then an optical cavity output signal and a light spot distribution mode transmitted by the passive cavity are respectively monitored by a photoelectric detector and a CCD camera, and the flexible generation of the laser transverse mode with different orders and different nodal line expansion directions is realized.
Compared with the prior art, the invention has the following advantages: the invention overcomes the defect that the traditional method for generating the high-order transverse mode is limited only by the adjustment range of the inclined cavity mirror by mutually matching and adjusting the inclination inside and outside the laser external modulation cavity and rotating the plane cavity mirror, and has the advantages of no change of a laser source, wider adjustment range, more transverse mode orders, various high-order modes, flexible and controllable transverse mode nodal line expansion direction, simple structure, convenient operation and the like.
Drawings
Fig. 1 is a schematic structural diagram of a laser external modulation transverse mode generating device of the present invention, wherein 1 is a laser light source, 2 is an indicating light source, 3 is a beam splitter mirror, 4 is a plane mirror, 5 is an inclination control system, 6 is a plane cavity mirror, 7 is a first plano-concave high-reflection cavity mirror, 8 is a first focusing lens, 9 is a photodetector, 10 is a second plano-concave high-reflection cavity mirror, 11 is a second focusing lens, 12 is a CCD camera, and 13 is a computer;
FIG. 2 is a partial laser transverse mode simulation image related to the laser external modulation transverse mode generating device theory of the present invention;
FIG. 3 is a partial laser transverse mode demonstration image obtained by an experiment of the laser external modulation transverse mode generating device according to the present invention;
fig. 4 is a first-order transverse mode demonstration image of different nodal line expansion directions obtained by an experiment of the laser external modulation transverse mode generating device.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
As shown in fig. 1, a laser external modulation transverse mode generating device includes: the device comprises a laser light source 1, an indicating light source 2, a light splitting reflector 3, a plane reflector 4, an inclination control system 5, a plane cavity mirror 6, a first plano-concave high-reflection cavity mirror 7, a second plano-concave high-reflection cavity mirror 10, a first focusing lens 8, a second focusing lens 11, a photoelectric detector 9, a CCD camera 12 and a computer 13; invisible light output by a laser light source 1 is coaxially output with a visible indication light source 2 reflected by a plane reflector 4 after passing through a light splitting reflector 3, an output light beam is modulated by an inclined aberration introduced by an inclination control system 5 and then injected into a folding passive cavity consisting of a plane cavity mirror 6, a first plano-concave high-reflection cavity mirror 7 and a second plano-concave high-reflection cavity mirror 10, an optical cavity output signal transmitted by the passive cavity is collected by a photoelectric detector 9 after being focused by a first focusing lens 8, and a light spot distribution mode transmitted by the passive cavity is monitored by a CCD camera 12 after being focused by a second focusing lens 11 and then is displayed in a laser transverse mode on a computer 13 display. The laser light source 1 is a continuous wave semiconductor laser with narrow line width. The tilt control system 5 can be a tilt deformable mirror, or a transmissive liquid crystal spatial light modulator, or a filter wheel with multiple tilt aberrators. The first plano-concave high-reflection cavity mirror 7 and the second plano-concave high-reflection cavity mirror 10 are arranged on the four-dimensional adjustable inclined mirror frame, so that the first plano-concave high-reflection cavity mirror 7 and the second plano-concave high-reflection cavity mirror 10 can be adjusted in the horizontal direction and the vertical direction to generate cavity mirror inclination misalignment, and can also be adjusted in the vertical direction and the left direction to generate cavity axis deviation misalignment. The tilt control system 5, the first plano-concave high-reflection cavity mirror 7 and the second plano-concave high-reflection cavity mirror 10 can be adjusted in a matched mode, combined regulation and control of the tilt inside and outside the passive cavity are formed, and flexible generation of laser external modulation transverse modes in different order modes is achieved. The plane cavity mirror 6 is arranged in the embedded rotary mounting seat, and the rotation angle can be adjusted in the cross section perpendicular to the light propagation direction, so that the angle of the laser high-order transverse mode nodal line in the expansion direction is regulated, and the flexible generation of the laser external-modulation high-order transverse mode in different nodal line expansion directions is realized.
The laser external modulation transverse mode generating device of the embodiment of the invention is characterized in that invisible light output by a laser light source 1 passes through a light splitting reflector 3 and then is coaxially output with an indicating light source 2 reflected by a plane reflector 4, an output light beam is modulated by inclined aberration introduced by an inclination control system 5 and then is injected into a folding passive cavity consisting of a plane mirror 6 and plano-concave high reflecting mirrors 7 and 10, an optical cavity output signal transmitted by the passive cavity is focused by a focusing lens 8 and then is collected by a photoelectric detector 9, and a light spot distribution mode transmitted by the passive cavity is focused by a second focusing lens 11 and is monitored by a CCD camera 12 and then is displayed on a computer 13 display in a laser transverse mode.
The laser light source 1 in fig. 1 is a continuous wave semiconductor laser with a narrow line width, and in this embodiment, a continuous semiconductor laser (RGB Photonics) with a center wavelength of 1064nm is used.
The tilt control system 5 in fig. 1 is in this embodiment a filter wheel with a plurality of tilt aberrometers.
The planar cavity mirror 6 in fig. 1 is mounted in an embedded rotary mount allowing adjustment of the rotation angle in a cross section perpendicular to the light propagation direction. In this example, an embedded rotary mount (LM1-A) with a 2 degree rotational accuracy produced by Thorlabs was used.
The first plano-concave high reflecting endoscope 7 and the second plano-concave high reflecting endoscope 10 in fig. 1 are installed on a four-dimensional adjustable inclined frame, and the four-dimensional adjustable frame in the embodiment can be used for performing horizontal and vertical inclination adjustment and vertical and horizontal translation adjustment.
Fig. 2 is a partial laser transverse mode simulation image related to the laser external modulation transverse mode generating device theory of the invention. In this example, a simulation from TEM was performed using Matlab calculations00To TEM33Different orders of the Hermite-Gaussian transverse mode spot mode.
Fig. 3 is a part of laser transverse mode demonstration images obtained by the experiment of the laser external modulation transverse mode generating device. In this embodiment, a slave TEM is generated by adjusting the filter wheel with multiple tilt aberrometers in the tilt control system 5 and the first and second piano concave high mirror 7, 10 mounted on the four-dimensional adjustable tilt frame00To TEM33And (3) acquiring and recording transverse mode light spot modes of Hermite-Gaussian of different orders respectively. Wherein the high order transverse mode can be excited in the horizontal direction using the tilt adjustment in the horizontal direction and the high order transverse mode can be excited in the vertical direction using the tilt adjustment in the vertical direction.
Fig. 4 is a first-order transverse mode demonstration image of different nodal line expansion directions obtained by an experiment of the laser external modulation transverse mode generating device. In this embodiment, first-order transverse mode light spots are obtained by using the method described in fig. 3, and then the planar cavity mirror 6 is adjusted by rotating in a fixed step length of 2 °, so as to obtain first-order transverse mode demonstration images in different nodal line expansion directions, which are collected and recorded respectively, and fig. 4 is six images selected from the selected nodal line expansion directions, which are distinguished obviously, for explanation.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.
Claims (6)
1. The utility model provides a horizontal mode generating device of laser external modulation which characterized in that includes: the device comprises a laser light source (1), an indicating light source (2), a light splitting reflector (3), a plane reflector (4), an inclination control system (5), a plane cavity mirror (6), a first plano-concave high-reflection cavity mirror (7), a second plano-concave high-reflection cavity mirror (10), a first focusing lens (8), a second focusing lens (11), a photoelectric detector (9), a CCD camera (12) and a computer (13); invisible light output by a laser light source (1) is coaxially output with a visible indication light source (2) reflected by a plane reflector (4) after passing through a light splitting reflector (3), an output light beam is modulated by inclined aberration introduced by an inclination control system (5) and then injected into a folding passive cavity consisting of a plane cavity mirror (6), a first plano-concave high reflection cavity mirror (7) and a second plano-concave high reflection cavity mirror (10), an optical cavity output signal transmitted by the passive cavity is collected by a photoelectric detector (9) after being focused by a first focusing lens (8), and a light spot distribution mode transmitted by the passive cavity is displayed on a computer (13) display after being focused by a second focusing lens (11) and monitored by a CCD camera (12).
2. The laser external modulation transverse mode generating device according to claim 1, characterized in that: the laser light source (1) is a continuous wave semiconductor laser with narrow line width.
3. The laser external modulation transverse mode generating device according to claim 1, characterized in that: the tilt control system (5) can be a tilt deformable mirror, or a transmission type liquid crystal spatial light modulator, or a filter wheel with a plurality of tilt aberrators.
4. The laser external modulation transverse mode generating device according to claim 1, characterized in that: the first plano-concave high-reflection endoscope (7) and the second plano-concave high-reflection endoscope (10) are arranged on the four-dimensional adjustable inclined mirror bracket, so that the first plano-concave high-reflection endoscope (7) and the second plano-concave high-reflection endoscope (10) can be adjusted in the horizontal direction and the vertical direction to generate endoscope inclination misalignment, and can also be adjusted in the vertical direction and the left-right direction to generate cavity axis deviation misalignment.
5. The laser external modulation transverse mode generating device according to claim 1, characterized in that: the tilt control system (5), the first plano-concave high-reflection cavity mirror (7) and the second plano-concave high-reflection cavity mirror (10) can be adjusted in a matched mode, combined regulation and control of the tilt inside and outside the passive cavity are formed, and flexible generation of laser external modulation transverse modes in different order modes is achieved.
6. The laser external modulation transverse mode generating device according to claim 1, characterized in that: the plane cavity mirror (6) is arranged in the embedded rotary mounting seat, and the rotation angle can be adjusted in the cross section perpendicular to the light propagation direction, so that the angle of the laser high-order transverse mode nodal line in the expansion direction is regulated and controlled, and the flexible generation of laser external-modulation high-order transverse modes in different nodal line expansion directions is realized.
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