CN112736632A - Structured light laser with built-in diffraction lens - Google Patents

Structured light laser with built-in diffraction lens Download PDF

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Publication number
CN112736632A
CN112736632A CN201911031283.5A CN201911031283A CN112736632A CN 112736632 A CN112736632 A CN 112736632A CN 201911031283 A CN201911031283 A CN 201911031283A CN 112736632 A CN112736632 A CN 112736632A
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CN
China
Prior art keywords
laser
reflector
light
dimensional translation
diffraction lens
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CN201911031283.5A
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Chinese (zh)
Inventor
管相合
张秀平
张军勇
张艳丽
朱健强
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Shanghai Institute of Optics and Fine Mechanics of CAS
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Shanghai Institute of Optics and Fine Mechanics of CAS
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Priority to CN201911031283.5A priority Critical patent/CN112736632A/en
Publication of CN112736632A publication Critical patent/CN112736632A/en
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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
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/08—Construction or shape of optical resonators or components thereof
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1814—Diffraction gratings structurally combined with one or more further optical elements, e.g. lenses, mirrors, prisms or other diffraction gratings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1876—Diffractive Fresnel lenses; Zone plates; Kinoforms
    • 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
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/08—Construction or shape of optical resonators or components thereof
    • H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
    • 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
    • H01S3/105—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Physics & Mathematics (AREA)
  • Laser Beam Processing (AREA)
  • Lasers (AREA)

Abstract

A structure light laser device with built-in diffraction lens comprises a pump light source, a laser gain medium, a pump light plane reflector, a plane total reflector, a concave partial reflector, an optical resonant cavity, a diffraction lens and a focusing lens, wherein the laser device of the invention enables laser beams oscillated in the resonant cavity to be subjected to coherent superposition through the diffraction effect of the diffraction lens on the beams, so that the concave partial reflector can output laser beams with different transverse structures, thereby realizing the adjustment of the output mode of the laser device; the invention can improve the stability of the output mode of the structured light laser, improve the adjusting range of the output mode of the structured light laser and reduce the complexity of the optical system of the structured light laser.

Description

Structured light laser with built-in diffraction lens
Technical Field
The invention relates to a diffraction device, in particular to a structured light laser device with a built-in diffraction lens.
Background
The resonator is one of the three main components of a laser and, in the simplest case, can be formed by appropriately placing two-sided mirrors across the laser gain medium. The resonant cavity has two main functions, the first function is to provide positive feedback, so that radiation generated in the gain medium passes through the medium for multiple times, the radiation is amplified in the resonant cavity, and self-oscillation is established. The second function is to select and amplify the mode of the light beam oscillation in the cavity, so that the self-oscillation established in the cavity is limited in a few eigenmodes determined by the cavity, and strong coherent light with good monochromaticity and directivity, namely laser, is finally obtained through multiple amplification of the gain medium. Therefore, the cavity plays a decisive role in the stability of the output laser and the controllability of the mode.
Diffractive lenses have beam focusing characteristics similar to refractive lenses, but produce multiple focal points on the optical axis compared to conventional single focus refractive lenses. Meanwhile, the diffractive lens has the unique advantages of small volume, light weight, low manufacturing cost, higher diffraction efficiency, special dispersion performance, more design freedom degrees, wide material selection range and the like, and has wide application in numerous fields such as micro optical systems, laser focusing, optical coupling, wavefront multiplexing, optical sensors, optical storage and the like. So far, no report related to the application of a diffraction lens in a structured light laser appears, so the patent proposes a structured light laser with a built-in diffraction lens. The device can output the laser beam of different transverse modes in order to realize the regulation to structure light laser output mode, can improve the stability of structure light laser output mode, can improve the control range of structure light laser output mode, can reduce structure light laser optical system's complexity.
Disclosure of Invention
The invention provides a structured light laser device with a diffraction lens arranged inside to realize the adjustment of the output mode of the laser, the device inserts a diffraction lens in an optical resonant cavity, and utilizes the diffraction effect of the diffraction lens on light beams to lead the laser light beams oscillating in the resonant cavity to generate coherent superposition, thereby outputting the laser light beams with different transverse modes to realize the adjustment of the output mode of the laser. The device can improve the stability of structured light laser output mode, can improve the control range of structured light laser output mode, can reduce structured light laser optical system's complexity.
The technical solution of the invention is as follows:
a structured light laser with a built-in diffraction lens is characterized by comprising an optical resonant cavity, a pumping light source, a pumping light plane reflector, a first three-dimensional translation stage, a second three-dimensional translation stage, an imaging detector, a third three-dimensional translation stage and a computer; the optical resonant cavity is composed of a plane holophote, a diffraction lens, a laser gain medium, a focusing lens and a concave part reflector which are sequentially arranged on the same optical axis, the plane holophote is fixed on a first three-dimensional translation stage, the concave part reflector is fixed on a second three-dimensional translation stage, the imaging detector is fixed on a third three-dimensional translation stage, and the output end of the imaging detector is connected with the input end of the computer;
the pump light source vertically irradiates into the laser gain medium, and transmitted light transmitted by the laser gain medium irradiates into the pump light plane reflector and is reflected back into the laser gain medium by the pump light plane reflector;
the laser gain medium is stimulated to emit, laser oscillation is generated in the optical resonant cavity, the oscillated laser beams are subjected to coherent superposition under the diffraction action of the diffraction lens, and the laser beams with different transverse modes are output by the concave partial reflecting mirror;
moving the first three-dimensional translation stage and the second three-dimensional translation stage to enable the laser beams with different transverse modes detected by the imaging detector to be detected;
the pumping light plane reflector is plated with a total reflection film for the wavelength of the pumping light source;
the light-transmitting surface of the focusing lens is plated with an anti-reflection film for the emission wavelength of the laser gain medium;
the diffraction lens is a zone plate, a photon sieve and other modulation devices with the function of a lens;
the imaging detector is a CCD camera, a CMOS image sensor and a thermoelectric array camera.
The invention has the following technical effects and advantages:
1. the invention has simple structure, small volume, simple operation and lower requirement on environment.
2. The invention makes the laser beam oscillated in the resonant cavity generate coherent superposition through the diffraction effect of the diffraction lens on the beam, so that the laser beams with different transverse modes can be output by the concave partial reflector, thereby realizing the adjustment of the output mode of the laser.
3. The invention can improve the stability of the output mode of the structured light laser, improve the adjusting range of the output mode of the structured light laser and reduce the complexity of the optical system of the structured light laser.
Drawings
FIG. 1 is a schematic structural diagram of a structured light laser device with a built-in diffraction lens according to the present invention
FIG. 2 is a schematic view of a photon sieve used in the present invention
FIG. 3 is an intensity distribution diagram of the invention with 18 petals as output light field
FIG. 4 is a schematic view of a zone plate structure used in the present invention
FIG. 5 is an intensity distribution diagram of the invention with 18 petals as output light field
FIG. 6 is an intensity distribution diagram of the invention with an output light field of 24 petal type
Detailed Description
The present invention will be further described with reference to the following examples and drawings, but the scope of the present invention should not be limited thereto.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a structured light laser device with a built-in diffraction lens according to the present invention, which includes an optical resonant cavity 7, a pump light source 1, a pump light plane mirror 3, a first three-dimensional translation stage 4, a second three-dimensional translation stage 8, an imaging detector 11, a third three-dimensional translation stage 12, and a computer 13; the optical resonant cavity 7 is composed of a plane holophote 5, a diffraction lens 9, a laser gain medium 2, a focusing lens 10 and a concave part reflector 6 which are arranged in sequence on the same optical axis, the plane holophote 5 is fixed on a first three-dimensional translation stage 4, the concave part reflector 6 is fixed on a second three-dimensional translation stage 8, the imaging detector 11 is fixed on a third three-dimensional translation stage 12, and the output end of the imaging detector 11 is connected with the input end of the computer 13;
the pump light source 1 vertically enters the laser gain medium 2, and transmitted light transmitted by the laser gain medium 2 enters the pump light plane reflector 3 and is reflected back into the laser gain medium 2 by the pump light plane reflector 3;
the laser gain medium 2 is stimulated to emit, laser oscillation is generated in the optical resonant cavity 7, the oscillated laser beams are subjected to coherent superposition under the diffraction action of the diffraction lens 9, and the laser beams with different transverse modes are output by the concave partial reflecting mirror 6;
moving the first three-dimensional translation stage 4 and the second three-dimensional translation stage 8 to enable the laser beams with different transverse modes detected by the imaging detector 11;
the pumping light plane reflector 3 is plated with a total reflection film for the wavelength of the pumping light source 1;
the light-transmitting surface of the focusing lens 10 is plated with an anti-reflection film for emitting wavelength to the laser gain medium 2;
the diffraction lens 9 is a zone plate, a photon sieve and other modulation devices with the function of a lens;
the imaging detector 11 is a CCD camera, a CMOS image sensor or a pyroelectric array camera.
The distance between the planar total reflector 5 and the diffraction lens 9, the distance between the diffraction lens 9 and the focusing lens 10, and the distance between the focusing lens 10 and the partial concave reflector 6 need to be determined according to the stability condition of the laser complex cavity.
Example 1: the diffractive lens being a photonic sieve
The pumping light source 1 adopts a laser diode (LD for short), the laser gain medium 2 is neodymium-doped yttrium aluminum garnet (Nd: YAG, the output wavelength is 1.06 μm, the length is 20mm), the transmittance of the partial concave reflector 6 is 40%, the curvature radius is 113cm, the diffraction lens 9 is a 65mm photon sieve (shown in figure 2) with the focal length being the focal length, the focal length of the focusing lens 10 is 80mm, and the imaging detector 11 is a CCD camera with the resolution ratio of 1392 × 1040. The distance between the diffraction lens 9 and the plane total reflection mirror 5 is 100 mm; the distance between the focusing lens 10 and the concave partial reflecting mirror 6 is 100 mm; the equivalent distance between the diffractive lens 9 and the focusing lens 10 is 80 mm. The output beam that this device can produce at this moment is for having 18 pieces of "petal laser pulse (as shown in fig. 3), realizes specifically that the structured light laser device based on built-in diffraction lens: as shown in fig. 1, the laser-induced polarization-enhanced laser comprises an LD light source 1, an Nd-YAG laser gain medium 2, a pump light plane reflector 3, a first three-dimensional translation stage 4, a plane total reflector 5, a concave partial reflector 6, an optical resonant cavity 7, a second three-dimensional translation stage 8, a photon sieve 9, a focusing lens 10, a CCD camera 11, a third three-dimensional translation stage 12 and a computer 13.
The optical resonant cavity 7 is composed of a plane holophote 5, a photon sieve 9, Nd, YAG laser gain medium 2, a focusing lens 10 and a concave part reflector 6 which are arranged in sequence on the same optical axis, the plane holophote 5 is fixed on a first three-dimensional translation stage 4, the concave part reflector 6 is fixed on a second three-dimensional translation stage 8, the imaging detector 11 is fixed on a third three-dimensional translation stage 12, and the output end of the imaging detector 11 is connected with the input end of the computer 13;
the pumping light source 1 vertically irradiates into the Nd: YAG laser gain medium 2, the transmitted light transmitted by the Nd: YAG laser gain medium 2 irradiates into the pumping light plane reflector 3, and is reflected back into the Nd: YAG laser gain medium 2 by the pumping light plane reflector 3;
YAG laser gain medium 2 is stimulated to emit, produce the laser oscillation in the said optical resonator 7, after the diffraction effect of the said photon sieve 9 makes the oscillating laser beam take place the coherent superposition, output the laser beam of different transverse modes by the said concave partial reflector 6;
the pumping light plane reflector 3 is plated with a total reflection film for the wavelength of the pumping light source 1;
the light-transmitting surface of the focusing lens 10 is plated with an anti-reflection film for the emission wavelength of the Nd-YAG laser gain medium 2;
and moving the first three-dimensional translation stage 4 and the second three-dimensional translation stage 8 to enable the CCD camera 11 to detect the petal-shaped transverse mode laser beams with 18 petals.
Example 2: the diffractive lens being a zone plate
The pumping light source 1 adopts a laser diode (LD for short), the laser gain medium 2 is neodymium-doped yttrium aluminum garnet (Nd: YAG, the output wavelength is 1.06 μm, the length is 20mm), the transmittance of the partial concave reflecting mirror 6 is 40%, the curvature radius is 113cm, the diffraction lens 9 is a zone plate (shown in figure 4) with the focal length of 52.6mm and 85.1mm, and the focal length of the focusing lens 10 is 80 mm. The distance between the diffraction lens 9 and the plane total reflection mirror 5 is 100 mm; the distance between the focusing lens 10 and the concave partial reflecting mirror 6 is 100 mm; the equivalent distance between the diffractive lens 9 and the focusing lens 10 is 90 mm. The output beam that this device can produce at this moment is for having 18 pieces of "petal laser pulse (as shown in fig. 5), realizes specifically that the structured light laser device based on built-in diffraction lens: as shown in fig. 1, the laser beam laser comprises an LD light source 1, an Nd: YAG laser gain medium 2, a pump light plane mirror 3, a first three-dimensional translation stage 4, a plane total reflection mirror 5, a concave partial reflection mirror 6, an optical resonant cavity 7, a second three-dimensional translation stage 8, a zone plate 9, a focusing lens 10, a CCD camera 11, a third three-dimensional translation stage 12 and a computer 13.
The optical resonant cavity 7 is composed of a plane total reflector 5, a zone plate 9, Nd, YAG laser gain medium 2, a focusing lens 10 and a concave part reflector 6 which are arranged in sequence on the same optical axis, the plane total reflector 5 is fixed on a first three-dimensional translation stage 4, the concave part reflector 6 is fixed on a second three-dimensional translation stage 8, the imaging detector 11 is fixed on a third three-dimensional translation stage 12, and the output end of the imaging detector 11 is connected with the input end of the computer 13;
the pumping light source 1 vertically irradiates into the Nd: YAG laser gain medium 2, the transmitted light transmitted by the Nd: YAG laser gain medium 2 irradiates into the pumping light plane reflector 3, and is reflected back into the Nd: YAG laser gain medium 2 by the pumping light plane reflector 3;
YAG laser gain medium 2 is stimulated to emit, produce the laser oscillation in the said optical resonator 7, after the diffraction effect of the said waveplate 9 makes the oscillating laser beam take place the coherent superposition, output the laser beam of different transverse modes by the said concave partial reflector 6;
the pumping light plane reflector 3 is plated with a total reflection film for the wavelength of the pumping light source 1;
the light-transmitting surface of the focusing lens 10 is plated with an anti-reflection film for the emission wavelength of the Nd-YAG laser gain medium 2;
moving the first three-dimensional translation stage 4 and the second three-dimensional translation stage 8 to enable the CCD camera 11 to detect a petal-shaped transverse mode laser beam with 18 petals;
if the effective distance between the zone plate 9 and the focusing lens 10 is adjusted to 120mm, the output beam at this time is a petal-shaped laser pulse having 24 "petals" (as shown in fig. 6).
The above-mentioned embodiments further explain the objects, technical solutions and advantages of the present invention in detail. It should be understood that the above description is only exemplary of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. A structured light laser with a built-in diffraction lens is characterized by comprising an optical resonant cavity (7), a pump light source (1), a pump light plane reflector (3), a first three-dimensional translation table (4), a second three-dimensional translation table (8), an imaging detector (11), a third three-dimensional translation table (12) and a computer (13); the optical resonant cavity (7) is composed of a plane total reflector (5), a diffraction lens (9), a laser gain medium (2), a focusing lens (10) and a concave part reflector (6) which are sequentially arranged on the same optical axis, the plane total reflector (5) is fixed on a first three-dimensional translation stage (4), the concave part reflector (6) is fixed on a second three-dimensional translation stage (8), the imaging detector (11) is fixed on a third three-dimensional translation stage (12), and the output end of the imaging detector (11) is connected with the input end of the computer (13);
the pumping light source (1) is vertically incident to the laser gain medium (2), and the transmitted light transmitted by the laser gain medium (2) is incident to the pumping light plane reflector (3) and reflected back to the laser gain medium (2) by the pumping light plane reflector (3);
the laser gain medium (2) is stimulated to emit, laser oscillation is generated in the optical resonant cavity (7), the oscillated laser beams are subjected to coherent superposition under the diffraction action of the diffraction lens (9), and the laser beams with different transverse modes are output by the concave partial reflector (6);
and the laser beams with different transverse modes are detected by the imaging detector (11) by moving the first three-dimensional translation stage (4) and the second three-dimensional translation stage (8).
2. The structured-light laser with built-in diffraction lens according to claim 1, wherein the pump-light plane mirror (3) is coated with a total reflection film for the wavelength of the pump-light source (1).
3. The structured light laser with built-in diffraction lens as claimed in claim 1, wherein the light transmitting surface of the focusing lens (10) is coated with an anti-reflection film for the emission wavelength of the laser gain medium (2).
4. The structured light laser with built-in diffraction lens according to claim 1, characterized in that the diffraction lens (9) is a zone plate, a photon sieve or other modulation device with lens function.
5. The structured light laser with built-in diffraction lens according to claim 1, wherein the imaging detector (11) is a CCD camera, a CMOS image sensor or a pyroelectric array camera.
CN201911031283.5A 2019-10-28 2019-10-28 Structured light laser with built-in diffraction lens Pending CN112736632A (en)

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Application Number Priority Date Filing Date Title
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CN112736632A true CN112736632A (en) 2021-04-30

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