CN114400500B - Laser external modulation transverse mode generating device - Google Patents
Laser external modulation transverse mode generating device Download PDFInfo
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- CN114400500B CN114400500B CN202111622487.3A CN202111622487A CN114400500B CN 114400500 B CN114400500 B CN 114400500B CN 202111622487 A CN202111622487 A CN 202111622487A CN 114400500 B CN114400500 B CN 114400500B
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- 239000004065 semiconductor Substances 0.000 claims description 5
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- 238000013519 translation Methods 0.000 claims description 3
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01S5/0653—Mode suppression, e.g. specific multimode
- 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 indication light source, wherein the two light sources are matched and adjusted by two spectroscopes to realize coaxial output; the tilt control system introduces tilt aberration to the incident laser, influences the incident laser mode and realizes tilt control outside the modulation cavity; the external modulation cavity system is a folding passive resonant cavity formed by 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 frame 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 intrinsic mode 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 passive cavity transmitted light beam after being focused by the lens. The invention has wider adjustment range, more laser mode orders and various higher-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 optical 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 technological advances and applications", molecular and Laser Spectroscopy,2020, 83-120; licheng, yuan; cavity ring-down high reflectance measurement techniques review, laser and optoelectronics progress, 2010, 47:021203). The stable field distribution of the intracavity electromagnetic field in the transverse x-y plane perpendicular to its propagation direction z is called transverse mode. Different transverse modes correspond to different laterally stable light field distributions and frequencies. It is known from the mode coupling theory that under certain conditions, when the laser beam is injected into the passive resonator, the intrinsic transverse mode of the passive resonator is excited. When the passive cavity is free of detuning, the incident laser beam generally excites a fundamental transverse mode within the cavity. When cavity parameters such as cavity mirror inclination, cavity axis offset and the like of the passive cavity are offset, a high-order transverse mode and even multiple transverse modes can be excited in the cavity. The traditional method can only produce the extracavity high-order transverse mode by tilting the resonant cavity mirror, has fewer adjustable elements and limited adjustment range, and has smaller obtained high-order mode order and limited types 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 of the invention is as follows: the passive cavity transmission light spot distribution mode is the result of the matching coupling of the incident laser mode and the passive cavity eigenmodes, so that the finally excited passive cavity transmission light spot distribution mode can be changed by affecting the incident laser mode or adjusting the passive cavity eigenmodes. By introducing the inclination control system outside the passive cavity and modulating the inclination and rotation angle of the cavity mirror in the passive cavity, the incident laser mode and the intrinsic mode of the passive cavity can be flexibly adjusted, and then the laser transverse modes of different order modes can be generated even at most.
Therefore, the device of the invention utilizes the photoelectric detector and the CCD camera to monitor the output signal of the optical cavity and the light spot distribution mode transmitted by the passive cavity respectively by the mode of the joint regulation and control of the inclination inside and outside the laser external modulation cavity system and the rotation plane cavity mirror, and can realize the flexible generation of the transverse modes of different order modes and different node line unfolding directions of the laser external modulation. Compared with the traditional method, the method has the advantages of no change of the laser source, wider adjustment range, more orders of the transverse mode, various types of high-order modes, simplicity and convenience in operation and the like.
Disclosure of Invention
The invention aims to solve the technical problems that: the traditional method can only produce the extracavity high-order transverse mode by tilting the resonant cavity mirror, has fewer adjustable elements and limited adjustment range, and has smaller obtained high-order mode order and limited types of complex high-order modes. Aiming at the problem, the invention provides the laser external modulation transverse mode generating device which is carried out in a mode of combining the passive cavity internal and external inclination regulation and rotation of the plane cavity mirror, so that the adjustment range can be effectively widened, and the mode of the transverse mode is more in order and various in high-order mode.
The technical scheme adopted for solving the technical problems is as follows: a laser external modulation transverse mode generating device, comprising: the device comprises a laser light source, an indication light source, a beam 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; the invisible light output by the laser light source is coaxially output by the visible indication light source reflected by the light splitting reflector and the plane reflector, the output light beam is modulated by the inclined aberration introduced by the inclined control system and then is injected into a folding passive cavity formed by the plane cavity mirror, the first flat concave high reflection cavity mirror and the second flat concave high reflection cavity mirror, an optical cavity output signal transmitted by the passive cavity is focused by the first focusing lens and then is collected by the photoelectric detector, and a light spot distribution mode transmitted by the passive cavity is focused by the second focusing lens and is monitored by the CCD camera and then is displayed in a laser transverse mode on the computer display.
The laser light source is a continuous wave semiconductor laser with narrow linewidth.
The tilt control system can be a tilt deformable mirror, a transmissive liquid crystal spatial light modulator, or a filter wheel with a plurality of tilt aberration plates.
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 bracket, so that the inclination adjustment of the first plano-concave high-reflection cavity mirror and the second plano-concave high-reflection cavity mirror in the horizontal direction and the vertical direction can be guaranteed to generate the cavity mirror inclination offset, and the translation adjustment in the up-down direction and the left-right direction can be carried out to generate the cavity axis offset.
The tilt control system, the first plano-concave high-reflection cavity mirror and the second plano-concave high-reflection cavity mirror can be mutually matched and adjusted to form the combined regulation and control of the tilt inside and outside the passive cavity, and the flexible generation of the laser transverse modes of different order modes is realized.
The plane cavity mirror is arranged in the embedded rotary mounting seat, the rotation angle can be adjusted in the cross section perpendicular to the light propagation direction, the adjustment and control of the angle of the unfolding direction of the laser high-order transverse mode line are formed, and the flexible generation of the laser high-order transverse modes in different unfolding directions of the laser high-order transverse mode line is realized.
The principle of the invention is as follows: according to the invention, from the theory of laser mode coupling, a modulation cavity is built outside a laser light source and a resonant cavity of the laser forms a composite cavity, an inclination control system is introduced to influence an incident laser mode, a passive cavity endoscope arranged on a four-dimensional adjustable mirror frame is adjusted to change an intrinsic mode of the passive cavity, the result of matching coupling of the incident laser mode and the passive cavity intrinsic mode can be changed through the mode of inclination combined regulation and control inside and outside the passive cavity and rotating a plane endoscope, and then laser transverse mode modes with different orders and different node line unfolding directions are excited in the cavity, and 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, so that flexible generation of the laser transverse mode with different orders and different node line unfolding 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 can only be limited by the inclination cavity mirror by mutually matching and adjusting the inclination inside and outside the laser outer modulation cavity and rotating the plane cavity mirror, and has the advantages of unchanged laser source, wider adjustment range, more transverse mode orders, various high-order modes, flexible and controllable transverse mode line unfolding 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 indication light source, 3 is a light splitting mirror, 4 is a plane mirror, 5 is an inclination control system, 6 is a plane mirror, 7 is a first plano-concave high-reflection cavity mirror, 8 is a first focusing lens, 9 is a photoelectric detector, 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 simulation image related to the theory of a laser external modulation transverse mode generating device of the invention;
FIG. 3 is a partial laser transverse mode demonstration image obtained by the experiment of the laser external modulation transverse mode generating device;
fig. 4 is a first-order transverse mode demonstration image of different node line unfolding directions obtained by experiments of the laser external modulation transverse mode generating device.
Detailed Description
The invention is further described below with reference to the drawings and detailed description.
As shown in fig. 1, a laser external modulation transverse mode generating device includes: the laser light source 1, the indicating light source 2, the light splitting reflector 3, the plane reflector 4, the inclination control system 5, the plane cavity mirror 6, the first plano-concave high-reflection cavity mirror 7, the second plano-concave high-reflection cavity mirror 10, the first focusing lens 8, the second focusing lens 11, the photoelectric detector 9, the CCD camera 12 and the computer 13; the invisible light output by the laser light source 1 is coaxially output by the visible indication light source 2 reflected by the light splitting reflector 3 and the plane reflector 4, the output light beam is modulated by the inclined aberration introduced by the inclined control system 5 and then is injected into a folding passive cavity formed by the plane cavity mirror 6, the first plano-concave high-reflection cavity mirror 7 and the second plano-concave high-reflection cavity mirror 10, the light cavity output signal transmitted by the passive cavity is focused by the first focusing lens 8 and then is collected by the photoelectric detector 9, and the light spot distribution mode transmitted by the passive cavity is focused by the second focusing lens 11 and then is monitored by the CCD camera 12 and then is displayed in a laser transverse mode on the display of the computer 13. The laser light source 1 is a continuous wave semiconductor laser with narrow linewidth. The tilt control system 5 may be a tilt deformable mirror, a transmissive liquid crystal spatial light modulator, or a filter wheel with a plurality of tilt aberrations. The first plano-concave high-reflection cavity mirror 7 and the second plano-concave high-reflection cavity mirror 10 are arranged on a four-dimensional adjustable inclined mirror bracket, so that the inclination adjustment of the first plano-concave high-reflection cavity mirror 7 and the second plano-concave high-reflection cavity mirror 10 in the horizontal direction and the vertical direction can be guaranteed to generate cavity mirror inclination offset, and the translation adjustment in the up-down direction and the left-right direction can be carried out to generate cavity axis offset. The inclination control system 5, the first plano-concave high-reflection cavity mirror 7 and the second plano-concave high-reflection cavity mirror 10 can be mutually matched and adjusted to form the combined regulation and control of the inclination inside and outside the passive cavity, and the flexible generation of the external modulation transverse modes of the laser in different order modes is realized. The plane cavity mirror 6 is arranged in the embedded rotary mounting seat, the rotation angle can be adjusted in the cross section perpendicular to the light propagation direction, the adjustment and control of the angle of the unfolding direction of the laser high-order transverse mode is formed, and the flexible generation of the laser external adjustment high-order transverse modes in different unfolding directions of the laser high-order transverse mode 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 is coaxially output by an indication light source 2 reflected by a plane reflecting mirror 4 after passing through a light splitting reflecting mirror 3, an output light beam is modulated by inclined aberration introduced by an inclined control system 5 and then is injected into a folding passive cavity formed by a plane cavity mirror 6 and plano-concave high-reflection cavity 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.
The laser light source 1 in fig. 1 is a continuous wave semiconductor laser of a narrow line width, and in this embodiment, a continuous semiconductor laser (RGB Photonics) having a center wavelength of 1064nm is used.
The tilt control system 5 in fig. 1 is a filter wheel with a plurality of tilted aberration plates in this embodiment.
The planar mirror 6 in fig. 1 is mounted in an embedded swivel mount, allowing for adjustment of the swivel angle in a cross section perpendicular to the direction of light propagation. In this example, an embedded rotary mount (LM 1-A) produced by Thorlabs with a rotational accuracy of 2℃was used.
The first plano-concave high-reflection endoscope 7 and the second plano-concave high-reflection endoscope 10 in fig. 1 are mounted on a four-dimensional adjustable tilting frame, which in this embodiment can perform tilt adjustment in the horizontal and vertical directions and translational adjustment in the up-down, left-right directions.
Fig. 2 is a partial laser transverse simulation image related to a theory of a laser external modulation transverse mode generating device of the invention. At the position ofIn this example, a simulation from TEM was performed using Matlab calculation 00 To TEM 33 Different orders of the 'hermite-Gaussian' transverse mode spot mode.
Fig. 3 is a partial laser transverse mode demonstration image obtained by experiment of the laser external modulation transverse mode generating device. In the present embodiment, the secondary TEM is generated by adjusting the filter wheel with a plurality of oblique aberration plates in the tilt control system 5 and the first plano-concave highly reflective cavity mirror 7, the second plano-concave highly reflective cavity mirror 10 mounted on the four-dimensional adjustable tilt frame 00 To TEM 33 Different-order 'hermite-Gaussian' transverse mode spot modes are acquired and recorded respectively. Wherein the higher order transverse mode can be excited in the horizontal direction using a tilt adjustment in the horizontal direction, and the higher order transverse mode can be excited in the vertical direction using a tilt adjustment in the vertical direction.
Fig. 4 is a first-order transverse mode demonstration image of different node line unfolding directions obtained by experiments of the laser external modulation transverse mode generating device. In this embodiment, first-order transverse mode light spots are obtained by adopting the method shown in fig. 3, then the planar cavity mirror 6 is rotated and adjusted with a fixed step length of 2 degrees, so that first-order transverse mode demonstration images with different node line unfolding directions can be obtained, the first-order transverse mode demonstration images are respectively acquired and recorded, and fig. 4 is a selected six images with obvious node line unfolding directions for illustration.
What is not described in detail in the present specification belongs to the prior art known to those skilled in the art.
Claims (1)
1. A laser external modulation transverse mode generating device, characterized by comprising: the device comprises a laser light source (1), an indication 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); the invisible light output by the laser light source (1) is coaxially output by the visible indication light source (2) reflected by the light splitting reflector (3) and the plane reflector (4), the output light beam is modulated by the inclined aberration introduced by the inclined control system (5), and then is injected into a folding passive cavity formed by the plane cavity mirror (6), the first flat concave high reflection cavity mirror (7) and the second flat concave high reflection cavity mirror (10), an optical cavity output signal transmitted by the passive cavity is focused by the first focusing lens (8) and then is collected by the photoelectric detector (9), and a light spot distribution mode transmitted by the passive cavity is focused by the second focusing lens (11) and is monitored by the CCD camera (12) 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 linewidth;
the tilt control system (5) can be a tilt deformable mirror, a transmission type liquid crystal spatial light modulator or a filter wheel with a plurality of tilt aberration plates;
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 bracket, so that the inclination adjustment of the first plano-concave high-reflection cavity mirror (7) and the second plano-concave high-reflection cavity mirror (10) in the horizontal direction and the vertical direction can be ensured to generate the inclination offset of the cavity mirror, and the translation adjustment in the up-down direction and the left-right direction can be performed to generate the cavity axis offset;
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 mutually matched and adjusted to form the combined regulation and control of the tilt inside and outside the passive cavity, so that the flexible generation of the external modulation transverse modes of the laser in different order modes is realized;
the plane cavity mirror (6) is arranged in the embedded rotary mounting seat, the rotation angle can be adjusted in the cross section perpendicular to the light propagation direction, the adjustment and control of the angle of the expansion direction of the laser high-order transverse mode line are formed, and the flexible generation of the laser external adjustment high-order transverse mode in different expansion directions of the laser high-order transverse mode is realized;
the secondary TEM is generated by adjusting a filter wheel with a plurality of inclined aberration plates in an inclined control system (5) and a first plano-concave high-reflection cavity mirror (7) and a second plano-concave high-reflection cavity mirror (10) which are arranged on a four-dimensional adjustable inclined mirror frame 00 To TEM 33 Different-order 'hermite-Gaussian' transverse mode spot modes are respectively collected and recorded,wherein the higher-order transverse mode can be excited in the horizontal direction by using the inclination adjustment in the horizontal direction, and the higher-order transverse mode can be excited in the vertical direction by using the inclination adjustment in the vertical direction;
the laser external modulation transverse mode generating device is used for obtaining first-order transverse mode demonstration images of different node line unfolding directions through experiments, obtaining first-order transverse mode light spots, and then rotating and adjusting the plane cavity mirror (6) with a fixed step length of 2 degrees, so that the first-order transverse mode demonstration images of different node line unfolding directions can be obtained, and the first-order transverse mode demonstration images are respectively collected and recorded.
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