CN113346345B - Solid laser capable of outputting vector vortex light beams with different modes at two ends - Google Patents
Solid laser capable of outputting vector vortex light beams with different modes at two ends Download PDFInfo
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- CN113346345B CN113346345B CN202110425674.6A CN202110425674A CN113346345B CN 113346345 B CN113346345 B CN 113346345B CN 202110425674 A CN202110425674 A CN 202110425674A CN 113346345 B CN113346345 B CN 113346345B
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10061—Polarization control
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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
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/082—Construction or shape of optical resonators or components thereof comprising three or more reflectors defining a plurality of resonators, e.g. for mode selection or suppression
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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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
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Abstract
The invention discloses a solid laser system capable of outputting vector vortex beams with different modes at two ends simultaneously. The invention enables one laser resonant cavity to comprise two sub-resonant cavities through intra-cavity polarization beam splitting, the two sub-resonant cavities are respectively placed into different photon spin-orbit coupling devices and simultaneously resonate, and then two vector vortex beams distributed in different modes are simultaneously output at two output coupling end mirrors. The system has simple structure and convenient operation, has great progress compared with the prior vector vortex beam intracavity generation technology, and has wide application in the fields of ultra-large capacity optical communication, optical tweezers, high resolution imaging, laser processing, quantum technology and the like.
Description
Technical Field
The invention belongs to the technical field of laser, and relates to a solid laser capable of outputting vector vortex beams with different modes at two ends.
Background
A vector vortex beam (vector vortex beam) is a new structured beam with cross-sectional anisotropic polarization state distribution that carries Orbital Angular Momentum (OAM). The unique property enables the material to have wide application prospects in the fields of large-capacity optical communication, particle manipulation, rotary detection, high-resolution imaging, laser processing, quantum technology and the like. Efficient generation of vector vortex beams is an important basis for their application. In recent years, scholars at home and abroad have developed certain research work on the generation technology of vector vortex beams, and provide various vector vortex beam generation methods and technologies, which can be divided into a laser intracavity direct generation method and an extracavity conversion method according to technical principles, wherein the intracavity method enables a laser resonant cavity to directly output vector vortex beams through a certain technical means; the outside-cavity conversion method is to convert light beams with other mode field distributions, such as fundamental mode Gaussian beams, hermitian Gaussian beams and the like, into vector vortex light beams outside the laser resonant cavity. Compared with the external cavity conversion, the vector vortex light beam laser is directly generated by introducing the light field regulation and control structure in the cavity, so that the advantages of higher mode purity, easiness in obtaining pulse output and the like are achieved. In addition, the laser system structure is more compact and stable, and is beneficial to future engineering application.
The existing vector vortex light beam intracavity generation technology can only generate one vector vortex light beam with specific mode distribution. However, in some application scenarios, it is often necessary to cooperate a plurality of vector vortex beams distributed in different modes, and at this time, it is necessary to design a corresponding special intra-cavity generation vector vortex laser system and to match an extra-cavity mode splitting conversion component, or to cooperate a plurality of vector vortex intra-cavity generation systems to operate. Both of the two schemes have the problems of complex structure, high design difficulty, high system cost, inconvenient operation and the like, and are not beneficial to practical application.
Disclosure of Invention
In view of this, the present invention provides a solid-state laser capable of outputting vector vortex beams with different modes at two ends, and aims to solve the limitation that the current laser can only output one vector vortex beam at one end at one time. According to the invention, two-end output of two vector vortex light beams distributed in different modes can be realized only by adding a plurality of simple optical components and lenses in a laser cavity and matching two output coupling end mirrors, and the laser cavity double-end output device is simple in structure and convenient to operate.
The invention provides a solid laser capable of outputting vector vortex beams distributed in different modes at two ends.
The invention discloses a solid laser system capable of outputting vector vortex beams distributed in different modes at two ends, which comprises a pumping source, a collimation and beam expansion lens group, two 45-degree double-color lenses, a gain medium, a total reflection end mirror, a polarization beam splitter, two photon spin-orbit coupling devices and two output coupling end mirrors. Wherein:
the pumping source is used for generating pumping light and providing energy injection for the gain medium;
the collimation and beam expansion lens group is arranged in a laser light path behind the pumping source and used for focusing the pumping light beam in the gain medium;
the two 45-degree double-color lenses are placed at 45 degrees, have high transmittance on incident pump light and high reflectivity on resonant light generated by a laser gain medium, wherein the first 45-degree double-color lens is placed in a laser light path behind the collimation and beam expansion lens set to enable the pump light to be coupled into a laser resonant cavity, and the second 45-degree double-color lens is placed in the laser light path behind the gain medium to couple residual pump light absorbed by the gain medium out of the resonant cavity. The two 45-degree dichroic mirror pieces act together to ensure that the resonant light is reflected in the laser resonant cavity;
the gain medium is arranged in a laser light path behind the first 45-degree two-color lens and used for generating resonant laser;
the total reflection end mirror is arranged in a laser light path behind the second 45-degree double-color lens, is plated with a film for totally reflecting the resonant light, and totally reflects the resonant light;
the polarization beam splitter is arranged in a laser light path below the first 45-degree two-color lens, is highly transparent to a horizontal line polarization component (p light) and highly reflective to a vertical line polarization component (s light) so as to polarize and split resonant light to form two sub-resonant cavities;
the two photon spin-orbit coupling devices are respectively arranged in the transmission and reflection laser light paths of the polarization beam splitter, and respectively convert the resonant horizontal and vertical linear polarization Gaussian beams into vector vortex beams distributed in different modes in the two sub-cavities;
and the two output coupling end mirrors are lenses with output transmittance, and are respectively arranged in the laser light path behind the two photon spin-orbit coupling devices, so that part of the generated resonant vector vortex light beam is output, and part of the generated resonant vector vortex light beam is reflected back to the resonant cavity to continue oscillation.
The invention has the following beneficial effects:
(1) The device can realize that one laser outputs vector vortex beams with different modes at the two ends simultaneously;
(2) The system has the advantages of simple structure, low cost, convenient operation, good light beam stability, convenient and adjustable whole structure and high flexibility, overcomes the technical bottleneck that the vector vortex light beams distributed in two different modes cannot be output simultaneously in the existing cavity, and fills up the technical vacancy under the application requirement.
Drawings
Fig. 1 is a schematic structural diagram of a solid-state laser system capable of outputting vector vortex beams with different modes at two ends according to the present invention, wherein: 1 is a pumping source; 2. 3 is a convex lens to form a collimation beam expanding lens group; 4. 6 is a 45-degree dichroic mirror; 5 is laser gain medium; 7 is a total reflection end mirror; 8 is a polarization beam splitter; 9 and 11 are photon spin-orbit coupling devices; 10 and 12 are output coupling end mirrors.
Fig. 2 is an intensity distribution of an 1645nm vector vortex beam actually generated by a solid-state laser capable of outputting vector vortex beams with different mode distributions at two ends according to the present invention, wherein: the first row is a vector vortex beam with polarization topological charge number p =1 output from one end; the second row is a vector vortex light beam with the polarization topological charge number p =3 output from the other end; the first column is the intensity distribution of the two beams of light; the second column is the intensity distribution after passing through the horizontal analyzer; the third column is the intensity distribution after passing through a 45 ° analyzer; the fourth column is the intensity distribution after passing through the vertical analyzer.
Detailed Description
The following detailed description is to be read in connection with the specific examples and the drawings.
The invention discloses a solid laser system capable of outputting vector vortex beams with different modes at two ends, which has a structure shown in figure 1: the device is provided with a pumping source (1), collimation and beam expansion lens groups (2, 3), 2 pieces of 45-degree bicolor lenses (4, 6), a gain medium (5), a total reflection end mirror (7), a polarization beam splitter (8), two photon spin-orbit coupling devices (9, 11) and two output coupling end mirrors (10, 12). Wherein:
the pumping source (1) is used for pumping Gaussian beams and providing energy injection for the gain medium (5); the collimation and beam expansion lens groups (2 and 3) are arranged in a laser light path behind the pumping source and are used for focusing pumping Gaussian beams in a gain medium; the two 45-degree double-color lenses (4 and 6) are placed at 45 degrees, have high transmittance to incident pump light and have high reflectivity to resonant light generated by a laser gain medium, wherein the first 45-degree double-color lens (4) is placed in a laser light path behind the collimation beam expanding lens group to enable the pump light to be coupled into a laser resonant cavity, the second 45-degree double-color lens (6) is placed in the laser light path behind the gain medium to couple residual pump light absorbed by the gain medium out of the resonant cavity, and the two 45-degree double-color lenses jointly act to ensure that the resonant light is reflected in the laser resonant cavity; the gain medium is arranged in a laser light path behind the first 45-degree two-color lens and used for generating resonant laser; the total reflection end mirror (7) is arranged in a laser light path behind the second 45-degree two-color lens, is plated with a film for totally reflecting the resonant light, and totally reflects the resonant light; the polarization beam splitter (8) is arranged in a laser light path below the first 45-degree two-color lens, is highly transparent to a horizontal line polarization component (p light) and highly reflective to a vertical line polarization component (s light), and is used for polarizing and splitting the resonance light to form two sub-resonant cavities; the two photon spin-orbit coupling devices (9, 11) are respectively arranged in transmission and reflection laser light paths of the polarization beam splitter, and convert resonant vertical and horizontal line polarization Gaussian beams (s light and p light) into vector vortex beams distributed in different modes in two sub-cavities respectively; the two output coupling end mirrors (10, 12) are lenses with output transmittance, and are respectively arranged in laser light paths behind the two photon spin-orbit coupling devices, so that the generated vector vortex is optically rotated to output a part of the output, and a part of the output is reflected to the resonant cavity to continue oscillation.
The invention discloses a solid laser system capable of outputting vector vortex beams with different modes at two ends, which comprises the following working processes and principles:
the pump laser (1) generates pump beams, the pump beams pass through the collimating beam expanding lens groups (2, 3), are coupled into a laser resonant cavity by a 45-degree dichroic mirror (4), and are focused in a gain medium (5); the gain medium absorbs the excited radiation after the pump beam to generate a resonant beam, and the resonant beam is reflected to a lower total reflection end mirror (7) through a second 45-degree dichroic mirror (6) behind the gain medium and is reflected; meanwhile, the residual pump light beam absorbed by the gain medium is transmitted out of the resonant cavity through a second 45-degree dichroic mirror (6); the resonance light reflected by the total reflection end mirror is reflected to a polarization beam splitter (8) through two dichroic mirrors (6, 4), and after polarization beam splitting, vertical and horizontal line polarization components (s light and p light) of the resonance light are respectively reflected and transmitted to two sub-resonance cavities at the rear part: the s-polarized light is modulated by the photon spin-orbit coupling device (9), is converted into vector vortex light beams by vertical linear polarized light, one part of the light beams are transmitted and output from a coupling output end mirror (10) at the rear, and the rest part of the light beams are reflected back to the photon orbit coupling device (9), are converted into vertical polarized light again, are reflected by the polarization beam splitter (8) and return to the upper resonant cavity; the p-polarized light passes through the photon spin-orbit coupling device (11), is converted into a vector vortex light beam distributed in another mode by horizontal linear polarized light, one part of the vector vortex light beam is transmitted and output from a coupling output end mirror (12) at the rear, and the rest of the vector vortex light beam is reflected back to the photon spin-orbit coupling device (11), is converted into horizontal polarized light again, is transmitted by the polarization beam splitter (8) and returns to the upper resonant cavity. In conclusion, both the horizontal line polarization component and the vertical line polarization component of the resonant light can satisfy the intra-cavity self-consistent condition to form stable oscillation. In addition, because two paths of transmission and reflection of the polarization beam splitter can be respectively arranged in photon spin-orbit coupling devices with different orders, the invention can simultaneously generate two vector vortex lasers with different mode distributions at the two ends.
Attention is paid to: the photon spin-orbit coupling device in the invention includes but is not limited to a q-wave plate, an s-wave plate, etc.
Example (b): two ends respectively output 1645nm vector vortex light beams with polarization topological charge numbers p of 1 and 3
In this embodiment, a 1470nm semiconductor laser is used as a pumping source, an Er: YAG crystal is used as a gain medium, and 1645nm vector vortex lasers with different mode distributions of polarization topological charge numbers p =1 and p =3 are respectively generated at two output coupling end mirrors, as shown in fig. 2, where: the first row is the first obtained beam of resonant light, which is a radial vector vortex beam with p = 1; the second row is the second beam of obtained resonance light, which is a vector vortex beam with p = 3; the first column is the intensity distribution of the two beams of light; the second column is the intensity distribution after passing through the horizontal analyzer; the third column shows the intensity distribution after passing through a 45 ° analyzer; the fourth column is the intensity distribution after passing through the vertical analyzer. FIG. 2 shows that two vector vortex light beams with different mode distributions are successfully generated by the solid laser capable of outputting vector vortex light beams with different mode distributions at two ends
Although the present invention has been described in detail in the foregoing, those skilled in the art should appreciate that the present invention is not limited to the above description. 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 (1)
1. The utility model provides a can bi-polar output different mode distribution vector vortex light beam's solid laser system, possesses pumping source, collimation beam expanding lens group, two 45 double-colored lenses of bivalve, gain medium, total reflection end mirror, polarization beam splitter, two photon spin-orbit coupling devices and two output coupling end mirrors, wherein:
the pumping source is used for generating pumping light and providing energy injection for the gain medium;
the collimation and beam expansion lens group is arranged in a laser light path behind the pumping source and used for focusing the pumping light beam in the gain medium;
the two 45-degree double-color lenses are placed at 45 degrees, have high transmittance on incident pump light and have high reflectivity on resonant light generated by a laser gain medium, wherein the first 45-degree double-color lens is placed in a laser light path behind the collimation and beam expansion lens set to enable the pump light to be coupled into a laser resonant cavity, the second 45-degree double-color lens is placed in the laser light path behind the gain medium to couple residual pump light absorbed by the gain medium out of the resonant cavity, and the two 45-degree double-color lenses act together to ensure that the resonant light is reflected in the laser resonant cavity;
the gain medium is arranged in a laser light path behind the first 45-degree two-color lens and used for generating resonant laser;
the total reflection end mirror is arranged in a laser light path behind the second 45-degree double-color lens, and is plated with a film for totally reflecting the resonant light to totally reflect the resonant light;
the polarization beam splitter is arranged in a laser light path below the first 45-degree two-color lens, is highly transparent to a horizontal line polarization component (p light) and highly reflective to a vertical line polarization component (s light), and is used for polarizing and splitting the resonance light to form two sub-resonant cavities;
the two photon spin-orbit coupling devices are respectively arranged in the transmission and reflection laser light paths of the polarization beam splitter, and respectively convert the resonant horizontal and vertical linear polarization Gaussian beams into vector vortex beams distributed in different modes in the two sub-resonant cavities;
and the two output coupling end mirrors are lenses with output transmittance, and are respectively arranged in the laser light path behind the two photon spin-orbit coupling devices, so that part of the generated resonant vector vortex light beam is output, and part of the generated resonant vector vortex light beam is reflected back to the resonant cavity to continue oscillation.
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| CN202110425674.6A CN113346345B (en) | 2021-04-20 | 2021-04-20 | Solid laser capable of outputting vector vortex light beams with different modes at two ends |
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| JP2003509871A (en) * | 1999-09-15 | 2003-03-11 | イエダ リサーチ アンド デベロツプメント カンパニー リミテツド | Optical resonator with orthogonal polarization mode |
| CN100407519C (en) * | 2006-08-07 | 2008-07-30 | 西安理工大学 | LD pumping cogain double cavity very-large frequency difference double frequency Nd:YAG laser |
| CN105514786B (en) * | 2016-01-22 | 2018-06-05 | 北京理工大学 | A kind of method and system of the adjustable half intracavitary generation vector beam of order |
| CN107681426B (en) * | 2017-09-22 | 2019-04-12 | 南京大学 | A kind of column symmetry vector light solid state laser that polarization is continuously adjustable |
| CN111541140B (en) * | 2020-04-02 | 2021-08-06 | 山东大学 | Yb-YAG ultrashort pulse laser amplifier based on brightness cascade pump |
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