CN115473115A - Concave reflection focusing multi-wavelength laser beam generation method and device - Google Patents

Concave reflection focusing multi-wavelength laser beam generation method and device Download PDF

Info

Publication number
CN115473115A
CN115473115A CN202211032845.XA CN202211032845A CN115473115A CN 115473115 A CN115473115 A CN 115473115A CN 202211032845 A CN202211032845 A CN 202211032845A CN 115473115 A CN115473115 A CN 115473115A
Authority
CN
China
Prior art keywords
laser
wavelength
level
wavelengths
acousto
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211032845.XA
Other languages
Chinese (zh)
Inventor
梁志国
张大治
邢帅
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Changcheng Institute of Metrology and Measurement AVIC
Original Assignee
Beijing Changcheng Institute of Metrology and Measurement AVIC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing Changcheng Institute of Metrology and Measurement AVIC filed Critical Beijing Changcheng Institute of Metrology and Measurement AVIC
Priority to CN202211032845.XA priority Critical patent/CN115473115A/en
Publication of CN115473115A publication Critical patent/CN115473115A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
    • H01S3/0071—Beam steering, e.g. whereby a mirror outside the cavity is present to change the beam direction
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/11—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
    • 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
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
    • H01S3/0085—Modulating the output, i.e. the laser beam is modulated outside the laser cavity
    • 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
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/101—Lasers provided with means to change the location from which, or the direction in which, laser radiation is emitted
    • 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
    • H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
    • H01S5/0071—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for beam steering, e.g. using a mirror outside the cavity to change the beam direction
    • 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
    • H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
    • H01S5/0085—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for modulating the output, i.e. the laser beam is modulated outside the laser cavity
    • 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

Abstract

The invention discloses a method and a device for generating concave reflection focusing multi-wavelength laser beams, and belongs to the technical field of photoelectric measurement. The invention takes the light frequency diffraction dispersion of the acousto-optic modulator as the basis, uses frequency signals to carry out frequency shift control, excites 5 diffracted light wavelengths of-2 level, -1 level, 0 level, +1 level and +2 level, uses a diaphragm device to shield and sort the diffracted light wavelengths, and uses a concave mirror to reflect, focus and combine the diffracted light wavelengths, thereby realizing the multi-wavelength laser beam containing a plurality of wavelength components and being convenient for the application of multi-wavelength laser ranging. The invention has the following characteristics: 1) The number of devices can be reduced, the size is reduced, and the structure is more compact. 2) The concave mirror is used for reflecting, focusing and combining multiple beams, the different beams can work normally when the included angle between the different beams is within pi, and the concave mirror can adapt to the reflection, focusing and combining of laser beams with any different diffraction orders. The invention can realize the common beam application of multi-wavelength lasers and can also realize the independent application of the multi-wavelength lasers.

Description

Concave reflection focusing multi-wavelength laser beam generation method and device
Technical Field
The invention relates to a method and a device for generating concave reflection focusing multi-wavelength laser beams, belonging to the technical field of photoelectric measurement.
Background
Laser measurement includes various types such as interference measurement and non-interference measurement, is commonly used for measuring length, distance, morphology, angle and the like, and is also used for measuring vibration, speed, motion and the like. Among them, a multi-wavelength measurement method is used in many cases. As the multi-wavelength measurement system, there are two-wavelength and three-wavelength systems. When the dual-wavelength measurement mode is realized, besides using a dual laser, a nonlinear frequency doubling technology and a birefringent crystal technology are commonly used. However, in the application of femtosecond laser multi-wavelength ranging, two or three lasers with different wavelengths need to run on a common optical path strictly, so that the modes are difficult to realize and the effect is not ideal enough. The laser beam generated by the femtosecond laser technology contains a plurality of wavelength components sharing a light path, and the required conditions can be realized in principle and logic, but because the femtosecond laser pulse contains too many wavelength components, the power component of each single wavelength laser is lower, and the femtosecond laser pulse can be practically applied in short-distance measurement, but is not easy to realize remote distance measurement application.
The patent "a method and apparatus for generating multi-wavelength laser beam (patent No. ZL 2020105734346)" discloses a method and apparatus for generating multi-wavelength combined laser beam by single-wavelength laser, which uses a convex lens to process collimation and convergence of multiple laser beams simultaneously based on reflection by a plane mirror, so as to realize multi-wavelength laser beam output, but in practical application, the following problems still exist: 1) The same convex lens is required to be used for collimating and focusing a plurality of light beams, the requirement on the geometric parameter processing and manufacturing precision of the convex lens is high, and in addition, the requirement on the precision of the focal position of the convex lens is high. Otherwise, the quality and the use of the combined laser light are affected. 2) Since the thickness of the convex lens cannot be 0, the focal length is limited by the minimum value, and the diameter of the lens is limited by the maximum value, the diffraction angles of beams with different wavelengths can only be changed within a certain range when the convex lens is used for generating multi-wavelength beam combination laser in the patent, when the difference between different diffraction wavelengths is large and the diffraction angles are too large, namely the difference between a plurality of wavelengths is large, the laser beam combination cannot be completed by using the convex lens mode, and the method cannot be used.
Disclosure of Invention
The invention belongs to a patent related to a multi-wavelength laser beam generation method and a device (patent No. ZL 2020105734346), and aims to solve the problem that high-power multi-wavelength common beams are difficult to realize in femtosecond laser three-wavelength ranging and the problem that the patent related to the multi-wavelength laser beam generation method and the device (patent No. ZL 2020105734346) is applied. The invention has the following characteristics: 1) Avoid using convex lens to carry out the collimation, use the level crossing to reflect, use convex lens to converge and restraint at last to make the device reduce the device number, reduce the volume, it is compacter, more be favorable to carrying out miniaturized integration. 2) Use concave mirror to carry out multibeam reflection, focus, beam combination, contained angle homoenergetic normal work when within pi between each different light beam promptly can adapt to the reflection of arbitrary different diffraction order laser beams, focus, beam combination to avoid the technical problem that two above-mentioned patents exist, promptly: the invention can respectively realize the light beams of laser with double wavelength, three wavelength, four wavelength and five wavelength, and is used for femtosecond laser ranging and other photoelectric measurement needing to realize multi-wavelength laser application. The invention can realize the common beam application of multi-wavelength lasers and can also realize the independent application of the multi-wavelength lasers.
The invention is realized by the following technical scheme.
The invention relates to a concave reflection focusing multi-wavelength laser beam generation method, which is based on optical frequency diffraction dispersion of an acousto-optic modulator, uses frequency signals to carry out frequency shift control, excites 5 diffracted light wavelengths of-2 level, -1 level, 0 level, +1 level and +2 level, uses a diaphragm device to shield and sort the diffracted light wavelengths, and uses a concave reflector to re-reflect and focus combined beams, thereby being capable of respectively realizing light beams with laser of double wavelength, three wavelength, four wavelength and five wavelength. The wavelength change of the acousto-optic modulator is realized by only using single-wavelength continuous laser and controlling the acousto-optic modulator in a sine wave frequency adjusting mode, different wavelengths of laser beams are obtained in a multi-level diffraction mode of the acousto-optic modulator, and the laser beams are reflected, focused and combined by using the concave mirror, so that multi-wavelength laser beams containing multiple wavelength components are realized, and the application of one laser to engineering application occasions with multiple wavelength requirements is facilitated.
The invention relates to a concave reflection focusing multi-wavelength laser beam generation method, which is based on optical frequency diffraction dispersion of an acousto-optic modulator, uses frequency signals to carry out frequency shift control, excites 5 diffracted light wavelengths of-2 level, -1 level, 0 level, +1 level and +2 level, uses a diaphragm device to shield and sort the diffracted light wavelengths, and uses a concave reflector to re-reflect and focus combined beams, thereby being capable of respectively realizing light beams with laser of double wavelength, three wavelength, four wavelength and five wavelength. The method for generating the concave reflection focusing multi-wavelength laser beam only uses single-wavelength continuous laser, controls the acousto-optic modulator in a sine wave frequency adjusting mode to realize wavelength change, obtains different wavelengths of the laser beam in a multi-level diffraction mode of the acousto-optic modulator, reflects and focuses the laser beam by using the concave mirror, passes through the acousto-optic modulator again and is extracted, and combined laser with multi-wavelength component characteristics is realized.
If the lasers with single wavelength are extracted directly after the acousto-optic modulator and are used respectively, the generated multi-wavelength lasers are not combined, and the application is more flexible.
The invention relates to a concave reflection focusing multi-wavelength laser beam generation device which comprises a laser, a polarization spectroscope, a lambda/2 wave plate, an acousto-optic modulator, a diaphragm, a concave reflector and a sinusoidal signal source and is used for realizing the concave reflection focusing multi-wavelength laser beam generation method.
The laser generated by the laser passes through the polarization beam splitter and the lambda/2 wave plate to reach the acousto-optic modulator. The frequency of a sinusoidal signal source is used for carrying out frequency shift control on the laser frequency passing through the acousto-optic modulator to generate diffraction laser with five wavelengths of-2 level, -1 level, 0 level, +1 level and +2 level, when the laser passes through the diaphragm, the laser is subjected to beam gating by the diaphragm, the laser with 1-5 wavelength components can be respectively selected to pass through, the laser passing through after the diaphragm gating returns to the acousto-optic modulator after being reflected by the concave reflector, the frequency of the laser is shifted by the acousto-optic modulator again, the laser passes through the lambda/2 wave plate and is reflected by the polarization spectroscope to generate multi-wavelength laser beams with the same beam characteristics and containing a plurality of wavelength components, and the multi-wavelength laser beam output is realized.
Preferably, the laser beams with different laser wavelengths are generated in a radioactive distribution by using an acousto-optic modulator diffraction mode, and the reflection and the convergence of the radioactive laser beams with different wavelengths are realized by using a concave mirror with a spherical characteristic.
Preferably, a concave mirror having spherical characteristics is used, the position of the center of sphere of which coincides with the point of convergence of the plurality of diffracted laser beams generated by the acousto-optic modulator.
Has the advantages that:
1. the invention discloses a method and a device for generating concave reflection focusing multi-wavelength laser beams, which only use single-wavelength continuous laser, use a sine wave frequency adjustment mode to control an acousto-optic modulator to realize wavelength change, use an acousto-optic modulator multi-level diffraction mode to obtain different wavelengths of laser beams, and use a concave mirror to reflect, focus and combine the laser beams, thereby realizing the multi-wavelength laser beams containing a plurality of wavelength components. The device avoids using a convex lens for collimation, using a plane mirror for reflection and finally using the convex lens for converging and converging beams, reduces the number of devices and the volume, is more compact and more beneficial to miniaturization integration.
2. The invention discloses a method and a device for generating a concave reflection focusing multi-wavelength laser beam, which only rely on laser with one wavelength to generate multi-wavelength laser with 2-5 wavelength combined beams, use sine frequency to regulate and control wavelength variation, have simple and reliable structure, low cost and easy realization, and can use one laser to deal with engineering application occasions with multiple wavelength requirements; in addition, the multi-wavelength laser generated by the invention can be taken out after the acousto-optic modulator without beam combination and can be used respectively. Making its application more flexible.
Drawings
Fig. 1 is a schematic structural diagram of a concave reflection focusing multi-wavelength laser beam generating device disclosed in the present invention.
Wherein: 1-laser, 2-polarization spectroscope, 3-lambda/2 wave plate, 4-acousto-optic modulator, 5-diaphragm, 6-concave reflector and 7-sinusoidal signal source.
Detailed Description
To better illustrate the objects and advantages of the present invention, the following description is provided in conjunction with the accompanying drawings and examples.
Example 1:
as shown in fig. 1, the concave reflection focusing multi-wavelength laser beam generating device disclosed in this embodiment is composed of a laser 1, a polarization beam splitter 2, a λ/2 wave plate 3, an acousto-optic modulator 4, an aperture 5, a concave reflecting mirror 6 and a sinusoidal signal source 7.
The laser generated by the laser 1 passes through the polarization beam splitter 2, passes through the lambda/2 wave plate 3, and reaches the acousto-optic modulator 4. The frequency of a sinusoidal signal source 7 is used for carrying out frequency shift control on the laser frequency passing through the optical modulator 4 to generate diffraction laser with five wavelengths of-2 level, -1 level, 0 level, +1 level and +2 level, when the laser passes through the diaphragm 5, the laser is subjected to beam gating by the diaphragm 5, the laser with 1-5 wavelength components can be respectively selected to pass through, then the laser passing through after the beam gating by the diaphragm 5 returns to the acousto-optic modulator 4 after being reflected by the concave reflector 6, is subjected to frequency shift by the acousto-optic modulator 4 again, passes through the lambda/2 wave plate 3, is reflected by the polarization spectroscope 2 to generate a multi-wavelength laser beam 8 with a common beam characteristic and containing a plurality of wavelength components, and multi-wavelength laser beam output is realized.
The method for generating the concave reflection focusing multi-wavelength laser beam disclosed by the embodiment is based on optical frequency diffraction dispersion of an acousto-optic modulator, frequency shift control is performed by using frequency signals, 5 diffracted light wavelengths including-2 level, -1 level, 0 level, +1 level and +2 level are excited, a diaphragm device is used for shielding and sorting the diffracted light wavelengths, and the recombined beams are re-reflected and focused by a concave reflector, so that light beams with laser of double wavelength, three wavelength, four wavelength and five wavelength can be respectively realized, and the method is used for femtosecond laser ranging and other photoelectric measurement needing multi-wavelength laser application.
Example 2:
as shown in fig. 1, the concave reflection focusing multi-wavelength laser beam generating device disclosed in this embodiment comprises a laser 1, a polarization beam splitter 2, a λ/2 wave plate 3, an acousto-optic modulator 4, a diaphragm 5, a concave reflecting mirror 6 and a sinusoidal signal source 7.
The laser generated by the laser 1 passes through the polarization beam splitter 2, passes through the lambda/2 wave plate 3, and reaches the acousto-optic modulator 4. The frequency of a sinusoidal signal source 7 is used for carrying out frequency shift control on the laser frequency passing through the optical modulator 4 to generate diffraction laser with five wavelengths of-2 level, -1 level, 0 level, +1 level and +2 level, when the laser passes through the diaphragm 5, the laser is subjected to beam gating by the diaphragm 5, the laser with 1-5 wavelength components can be selected to pass through respectively, then the laser passing through after the beam gating by the diaphragm 5 returns to the acousto-optic modulator 4 after being reflected by the concave reflector 6, is subjected to frequency shift by the acousto-optic modulator 4 again, passes through the lambda/2 wave plate 3, is reflected by the polarization spectroscope 2 to generate a multi-wavelength laser beam 8 with a common beam characteristic and containing a plurality of wavelength components, and multi-wavelength laser beam output is realized.
In the method for generating the concave reflection focusing multi-wavelength laser beam disclosed by the embodiment, only single-wavelength continuous laser is used, the acoustic optical modulator is controlled in a sine wave frequency adjusting mode to realize wavelength change, different wavelengths of the laser beam are obtained in a multi-stage diffraction mode of the acoustic optical modulator, the laser beam is reflected and focused by the concave mirror, the wavelengths are respectively and independently taken out after the acoustic optical modulator and are respectively used, namely, the generated multi-wavelength laser is extracted without beam combination, and the application is more flexible.
Example 3:
as shown in fig. 1, the concave reflection focusing multi-wavelength laser beam generating device disclosed in this embodiment comprises a laser 1, a polarization beam splitter 2, a λ/2 wave plate 3, an acousto-optic modulator 4, a diaphragm 5, a concave reflecting mirror 6 and a sinusoidal signal source 7.
The laser generated by the laser 1 passes through the polarization beam splitter 2, passes through the lambda/2 wave plate 3, and reaches the acousto-optic modulator 4. The frequency of a sinusoidal signal source 7 is used for carrying out frequency shift control on the laser frequency passing through the optical modulator 4 to generate diffraction laser with five wavelengths of-2 level, -1 level, 0 level, +1 level and +2 level, when the laser passes through the diaphragm 5, the laser is subjected to beam gating by the diaphragm 5, the laser with 1-5 wavelength components can be selected to pass through respectively, then the laser passing through after the beam gating by the diaphragm 5 returns to the acousto-optic modulator 4 after being reflected by the concave reflector 6, is subjected to frequency shift by the acousto-optic modulator 4 again, passes through the lambda/2 wave plate 3, is reflected by the polarization spectroscope 2 to generate a multi-wavelength laser beam 8 with a common beam characteristic and containing a plurality of wavelength components, and multi-wavelength laser beam output is realized.
The working mode of diffraction of the acousto-optic modulator is used for generating a plurality of laser beams with different laser wavelengths in radioactive distribution, and a concave mirror with spherical characteristics is used for reflecting and converging the plurality of laser beams with different wavelengths in radioactive distribution.
The spherical center of the concave mirror with spherical characteristics is coincident with the convergent point of a plurality of diffracted laser beams generated by the acousto-optic modulator.
Because the adjustment fineness and the frequency accuracy of the sine frequency are very high, the obtained wavelength adjustment fineness is also very high, and the fine adjustment of the wavelength component of the measuring beam can be realized.
The above detailed description is intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above detailed description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (5)

1. A concave reflection focusing multi-wavelength laser beam generation method is characterized in that: based on the optical frequency diffraction dispersion of the acousto-optic modulator, frequency shift control is carried out by using frequency signals, 5 diffracted light wavelengths of-2 level, -1 level, 0 level, +1 level and +2 level are excited, the diffracted light wavelengths are shielded and sorted by using a diaphragm device, and the beams are reflected again and focused to combine through a concave reflector, so that light beams of laser with two wavelengths, three wavelengths, four wavelengths and five wavelengths can be respectively realized; the multi-wavelength laser beam with multiple wavelength components is realized by only using single-wavelength continuous laser, controlling the acousto-optic modulator in a sine wave frequency adjusting mode to realize wavelength change, using the acousto-optic modulator in a multi-level diffraction mode to obtain different wavelengths of the laser beam, and then using the concave mirror to reflect, focus and combine the laser beam, so that the multi-wavelength laser beam with multiple wavelength components is realized, and the engineering application occasions with multiple wavelength requirements can be conveniently met by using one laser.
2. A concave reflection focusing multi-wavelength laser beam generation method is characterized in that: based on the optical frequency diffraction dispersion of the acousto-optic modulator, frequency shift control is carried out by using frequency signals, 5 diffraction optical wavelengths of-2 level, -1 level, 0 level, +1 level and +2 level are excited, the diffraction optical wavelengths are shielded and sorted by using a diaphragm device, and the beams are reflected again and focused by a concave reflector to be combined, so that the beams of laser with two wavelengths, three wavelengths, four wavelengths and five wavelengths can be respectively realized; the wavelength change of the acousto-optic modulator is realized by only using single-wavelength continuous laser and controlling the acousto-optic modulator in a sine wave frequency adjusting mode, different wavelengths of a laser beam are obtained in a multi-level diffraction mode of the acousto-optic modulator, the laser beam is reflected and focused by using the concave mirror, the wavelengths are respectively and independently taken out after the acousto-optic modulator and are used respectively, and the generated multi-wavelength laser is not subjected to beam combination, so that the application is more flexible.
3. A concave reflection focusing multi-wavelength laser beam generating apparatus for realizing a concave reflection focusing multi-wavelength laser beam generating method according to claim 1 or 2, characterized in that: the device comprises a laser (1), a polarization beam splitter (2), a lambda/2 wave plate (3), an acousto-optic modulator (4), a diaphragm (5), a concave reflector (6) and a sinusoidal signal source;
laser generated by the laser (1) passes through the polarization beam splitter (2) and the lambda/2 wave plate (3) to reach the acousto-optic modulator 4; the frequency of a sinusoidal signal source 7 is used for carrying out frequency shift control on the laser frequency passing through an optical modulator (4) to generate diffraction laser with five wavelengths of-2 level, -1 level, 0 level, +1 level and +2 level, when the laser passes through an aperture (5), the laser is subjected to beam gating by the aperture (5), the laser with 1-5 wavelength components can be selected to pass through respectively, then the laser passing through after the beam gating by the aperture (5) returns to the acousto-optic modulator (4) after being reflected by a concave reflector (6), is subjected to frequency shift by the acousto-optic modulator (4) again, passes through a lambda/2 wave plate (3), is reflected by a polarization spectroscope (2), generates a multi-wavelength laser beam (8) with common beam characteristics and containing a plurality of wavelength components, and realizes the output of multi-wavelength combined beam laser.
4. A concave reflection focusing multi-wavelength laser beam generating apparatus according to claim 3, wherein: the working mode of diffraction of the acousto-optic modulator (4) is used for generating a plurality of laser beams with different laser wavelengths in radioactive distribution, and a concave mirror with spherical characteristics is used for reflecting and converging the plurality of laser beams with different wavelengths in radioactive distribution.
5. A concave reflection focusing multi-wavelength laser beam generating apparatus according to claim 3, wherein: the spherical center of the concave mirror with spherical characteristics is coincident with the convergence point of a plurality of diffracted laser beams generated by the acousto-optic modulator (4).
CN202211032845.XA 2022-08-26 2022-08-26 Concave reflection focusing multi-wavelength laser beam generation method and device Pending CN115473115A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211032845.XA CN115473115A (en) 2022-08-26 2022-08-26 Concave reflection focusing multi-wavelength laser beam generation method and device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211032845.XA CN115473115A (en) 2022-08-26 2022-08-26 Concave reflection focusing multi-wavelength laser beam generation method and device

Publications (1)

Publication Number Publication Date
CN115473115A true CN115473115A (en) 2022-12-13

Family

ID=84369376

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211032845.XA Pending CN115473115A (en) 2022-08-26 2022-08-26 Concave reflection focusing multi-wavelength laser beam generation method and device

Country Status (1)

Country Link
CN (1) CN115473115A (en)

Similar Documents

Publication Publication Date Title
CN111999958B (en) Laser beam splitting device and method based on cascade acousto-optic deflection
CN113092379A (en) Spatially resolved transient system
CN205141361U (en) Exocoel tuned laser
KR20220104810A (en) Frequency converter for optimizing the properties of harmonics in lasers
CN111399218A (en) Laser radar beam scanning system based on polarization grating
CN102570311A (en) Tunable narrow-band UV laser generating device and generating method therefor
CN112612142A (en) Optical system for generating quasi-flat-top circular light spots
CN104348555B (en) Semiconductor laser for fiber optic communication
CN115473115A (en) Concave reflection focusing multi-wavelength laser beam generation method and device
CN112018597A (en) External cavity semiconductor laser
CN111323925A (en) Optical system for generating controllable convergent vortex light beam
CN111725697B (en) Multi-wavelength laser beam generation method and device
CN114122882B (en) Wavelength wide tuning single longitudinal mode laser based on single ring cavity
CN101958510B (en) External-cavity semiconductor laser
CN213876189U (en) Optical system for generating quasi-flat-top circular light spots
CN115117732A (en) Semiconductor laser with tunable external cavity
CN115966995A (en) Narrow linewidth external cavity laser device based on semi-confocal cavity
CN113904208A (en) High-purity Laguerre Gaussian beam generation system and generation method thereof
CN113488845A (en) Multi-tube blue light semiconductor frequency doubling method and device based on spectrum beam combination
CN102315588A (en) Fabry-Perot (F-P) cavity and laser using same
CN115494650B (en) Composite light beam synthesizing method and system
CN117712822A (en) Spectrum beam combining device of semiconductor laser
CN113219683B (en) Parallel laser beam splitting device based on single acousto-optic deflection and adjusting method
CN216251609U (en) Laser with adjustable wavelength
CN116154599B (en) Compact spectrum synthesizer

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination