CN115459045A

CN115459045A - Laser for generating multi-pulse laser sequence

Info

Publication number: CN115459045A
Application number: CN202211212970.9A
Authority: CN
Inventors: 赵虎
Original assignee: Beijing Oriental Sharp Laser Technology Co ltd
Current assignee: Beijing Oriental Sharp Laser Technology Co ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2022-12-09

Abstract

The invention provides a laser for generating a multi-pulse laser sequence, which comprises a first reflector array, a second reflector array, a Q switch array, a wave plate array, a polaroid array, a single-lamp multi-rod light-gathering cavity and a plane output mirror, wherein the first reflector array is arranged on the first reflector array; the laser comprises a first reflector array, a second reflector array, a Q switch array, a wave plate array, a polaroid array, a single-lamp multi-rod light-gathering cavity and a plane output mirror which are sequentially arranged in a line, so that the laser has a multi-path laser resonant cavity structure, and the Q switch array, the wave plate array and the polaroid array are all used for adjusting Q of the laser resonant cavity. The invention realizes the high integration of the multi-path laser resonant cavity, utilizes the effective space occupied by the laser to the maximum extent and generates multi-path laser pulse sequence output; the one-side output mirror is matched with the multi-side total reflection mirror to realize multi-path laser output, so that the emergent parallelism of multi-path laser pulses is improved; by adjusting the quarter-wave voltage time sequence required by the Q switch array, multi-pulse laser output with different intervals and different orders can be realized.

Description

Laser for generating multi-pulse laser sequence

Technical Field

The invention relates to a pulse laser sequence generation technology, in particular to a laser for generating a multi-pulse laser sequence.

Background

The multi-pulse laser sequence has important application value in the fields of laser ranging, laser detection, laser processing and the like, and especially, the limited number of pulse sequences with high peak power and ultrashort pulse intervals can be used as laser sources for various applications.

There are many methods for generating a multi-pulse laser sequence with high peak power and ultrashort pulse intervals, but most of them have certain defects. If a fiber laser is used for generating high repetition frequency laser pulses, the peak power of the laser pulses is difficult to reach megawatt level due to the damage threshold of fiber transmission; the solid high-repetition-frequency laser can generate laser pulses with high peak power and high repetition frequency in a multi-stage amplification mode, but the whole system is complex and the cost performance is low; the laser pulse sequence with high peak power and high repetition frequency can be realized by controlling a plurality of low-frequency lasers through external triggering and combining beams, but the mode has high cost and a beam combining system of more than two lasers is complex; the pulse sequence output is realized by adjusting Q for multiple times in one pumping period, and in this way, in order to enable the laser energy to reach a certain value, the interval time between pulses is long, and short-interval output cannot be realized.

Disclosure of Invention

It is an object of the present invention to provide a laser for generating a multi-pulse laser train to solve the above-mentioned problems in the prior art. A multi-pulse 1.06 micron laser capable of realizing high peak power and adjustable pulse interval is developed, periodic pulse train output can be realized, and the pulse envelope period can be output along with external time system.

In order to achieve the purpose, the invention provides the following technical scheme:

a laser for generating a multi-pulse laser sequence comprises a first reflector array, a second reflector array, a Q switch array, a wave plate array, a polaroid array, a single-lamp multi-rod light-gathering cavity and a plane output mirror; the laser comprises a first reflector array, a second reflector array, a Q switch array, a wave plate array, a polaroid array, a single-lamp multi-rod light-gathering cavity and a plane output mirror which are sequentially arranged in a line, so that the laser has a multi-path laser resonant cavity structure, and the first reflector array and the second reflector array are reflector arrays which are staggered with each other; the Q switch array, the wave plate array and the polaroid array are all used for Q modulation of a laser resonant cavity of the laser; the single-lamp multi-rod light-gathering cavity is of a high-efficiency multi-path pumping structure and is used for transmitting multi-path laser; the planar output mirror is used for forming an emergent end of the laser.

Further, the first reflecting mirror array and the second reflecting mirror array are composed of a perforated mirror frame and three full-reflecting mirror bases, the perforated mirror frame is provided with three full-reflecting mirror bases in a rotating symmetrical mode around the center, full-reflecting mirrors are arranged on the full-reflecting mirror bases, the three full-reflecting mirror bases of the first reflecting mirror array are arranged in an inverted triangle mode, the three full-reflecting mirror bases of the second reflecting mirror array are arranged in a triangle mode, the three full-reflecting mirror bases of the second reflecting mirror array are staggered with each other, and a six-path full-reflecting mirror array is formed.

Furthermore, the Q switch array consists of a pedestal and six Q switches, and the six Q switches are arranged on the pedestal in a rotational symmetry manner around the center.

Further, the wave plate array comprises a mirror bracket with holes and six wave plate mirror bases, the wave plate mirror bases are installed on the front side and the rear side of the mirror bracket with holes at intervals and are rotationally symmetrical around the center, and wave plates are installed on the wave plate mirror bases.

Furthermore, the polaroid array comprises three mirror frames provided with polaroids, and each mirror frame is provided with two polaroids six which are respectively aligned with the six crystal rods of the single-lamp multi-rod light-gathering cavity.

Furthermore, the single-lamp multi-rod light-gathering cavity consists of a pump xenon lamp positioned in the center and six crystal rods which are rotationally symmetrical around the center.

Compared with the prior art, the invention has the beneficial effects that:

1. the high integration of the multi-path laser resonant cavity is realized, the effective space occupied by the laser can be utilized to the maximum extent, and multi-path laser pulse sequence output is generated;

2. the one-side output mirror is matched with the multi-side total reflection mirror to realize multi-path laser output, so that the emergent parallelism of multi-path laser pulses is improved;

3. by adjusting the quarter-wave voltage time sequence required by the Q switch array, multi-pulse laser output with different intervals and different orders can be realized.

Drawings

FIG. 1 is a schematic diagram of a laser for generating a multi-pulse laser sequence according to the present invention;

FIG. 2 is a schematic diagram of a single-pass laser resonator.

In the figure: 1. a first reflector array; 11. a total reflection mirror; 2. a second reflector array; 3. a Q-switch array; 31. a Q-switch; 4. a wave plate array; 41. a wave plate; 5. a polarizer array; 51. a polarizing plate; 6. a single-lamp multi-rod light-gathering cavity; 61. pumping a xenon lamp; 62. a crystal rod; 7. a planar output mirror.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

As shown in fig. 1, a laser for generating a multi-pulse laser sequence includes a first mirror array 1, a second mirror array 2, a Q-switch array 3, a wave plate array 4, a polarizer array 5, a single-lamp multi-rod light-gathering cavity 6, and a planar output mirror 7; the laser comprises a reflector array I1, a reflector array II 2, a Q-switch array 3, a wave plate array 4, a polaroid array 5, a single-lamp multi-rod light-gathering cavity 6 and a plane output mirror 7 which are sequentially arranged in a line, so that the laser has a multi-path laser resonant cavity structure, and the reflector array I1 and the reflector array II 2 are reflector arrays which are staggered with each other; the Q switch array 3, the wave plate array 4 and the polaroid array 5 are all used for Q-switching of a laser resonant cavity of a laser; the single-lamp multi-rod light-gathering cavity 6 is of a high-efficiency multi-path pumping structure and is used for emitting multi-path laser; the plane output mirror 7 is used for forming an emergent end of the laser.

Further, first speculum array 1 and second speculum array 2 constitute by foraminiferous mirror holder and three full mirror seat of reflecting, set up threely around central rotational symmetry on the foraminiferous mirror holder the full mirror seat of reflecting, be equipped with full mirror 11 on the full mirror seat of reflecting, the three full mirror seat of reflecting of first speculum array 1 is the triangle-shaped of falling and arranges, the three full mirror seat of reflecting of second speculum array 2 is the triangle-shaped and arranges, staggers each other between the two, constitutes six way full mirror arrays of reflecting.

Further, the Q-switch array 3 is composed of a base frame and six Q-switches 31, and the six Q-switches 31 are arranged on the base frame in a rotational symmetry manner around a center.

Further, the wave plate array 4 comprises a frame with holes and six wave plate lens seats, the wave plate lens seats are arranged on the front and back surfaces of the frame with holes at intervals and are rotationally symmetrical around the center, the wave plate lens seats are provided with wave plates 41, the wave plates 41 are lambda/4 wave plates, lambda is the wavelength, and lambda/4 is the quarter wavelength.

Further, the polarizer array 5 includes three mirror frames with polarizers 51, two polarizers 51 are disposed on each mirror frame, and six polarizers 51 are aligned to six crystal rods 62 of the single-lamp multi-rod light-gathering cavity 6 respectively.

Further, the single-lamp multi-rod light-gathering cavity 6 is composed of a pump xenon lamp 61 positioned in the center and six crystal rods 62 which are rotationally symmetrical around the center.

The working principle of the invention is as follows:

the components necessary for forming the single-path laser resonator are shown in fig. 2, which includes a total reflection mirror 11, a Q-switch 31, a wave plate 41, a polarizer 51, a pump xenon lamp 61, a crystal rod 62 and a plane output mirror 7, and the arrows in the figure are the laser emitting direction. As shown in fig. 1, the six laser resonators share a planar output mirror 7 and a pump xenon lamp 61, and other devices are designed as shown in fig. 1 for the purposes of compact structure, space saving and easy debugging.

The laser resonant cavity works at a set repetition frequency under the control of a power supply to output high-energy laser pulses. Each pulse period of the laser system operation is a repeated process of discharging, storing energy, adjusting Q and outputting.

And (3) a pumping discharge stage: in a working period, with the continuous injection of the pumping light emitted by the pumping xenon lamp 61, the ground state particles in the crystal rod 62 are continuously pumped to an upper energy level, once the population number layout inversion is realized, 1064nm fluorescence radiation is generated in the laser resonant cavity, but the radiation intensity is still at a noise level and has no directivity and coherence. As the intensity of the radiation increases, when the gain of the laser cavity is greater than the loss, the laser will produce a laser output that exits through the planar output mirror 7.

An energy storage stage: in the stage that no voltage is applied to two ends of the Q switch 31, because linearly polarized light passes through the lambda/4 wave plate 41 twice, the polarization direction can rotate by 90 degrees, the linearly polarized light cannot penetrate through the polarizing plate 51 during reverse propagation, and at the moment, the laser resonant cavity is in a low Q value state, and laser oscillation cannot be formed in the laser resonant cavity. At this time, the crystal rod 62 is in a continuous energy storage stage under the irradiation of the pump xenon lamp 61, and the number of particles at the upper energy level is continuously increased. The energy storage time is determined based on the lifetime of the upper energy level of the crystal rod 62.

And (3) Q adjusting stage: after the discharge of the pump xenon lamp 61 is finished, the upper energy level in the crystal rod 62 stores enough energy, at the moment, voltage is loaded at two ends of the Q switch 31, the laser resonant cavity is converted into a high Q value state, pulse oscillation is established in the cavity, and the energy stored in the crystal rod 62 is output out of the cavity in the form of giant pulse. (in this stage, the six Q-switches 31 can be sequentially loaded with voltage according to the requirements, and which voltage is loaded and which voltage outputs laser light.)

And (3) pulse output: a voltage is applied across the Q-switch 31, and a polarized laser pulse associated with the polarizing plate 51 is output. The time taken for pulse set-up is short, on the order of nanoseconds. After the giant pulse is output, the voltage at the two ends of the Q switch 31 is removed, the laser resonant cavity enters the low Q value state again, and one working cycle is finished.

The present invention has been described in detail with reference to the embodiments, but the description is only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The scope of the invention is defined by the claims. The technical solutions of the present invention or those skilled in the art, based on the teachings of the technical solutions of the present invention, should be within the scope of the present invention, and the claims of the present invention should also cover the scope of the present invention by designing similar technical solutions to achieve the above technical effects or by making equivalent changes and improvements in the scope of the present invention.

Claims

1. A laser for generating a multi-pulse laser sequence is characterized by comprising a first reflector array (1), a second reflector array (2), a Q switch array (3), a wave plate array (4), a polaroid array (5), a single-lamp multi-rod light-gathering cavity (6) and a plane output mirror (7); the reflector array I (1), the reflector array II (2), the Q-switch array (3), the wave plate array (4), the polaroid array (5), the single-lamp multi-rod light-gathering cavity (6) and the plane output mirror (7) are sequentially arranged in a line, and the reflector array I (1) and the reflector array II (2) are reflector arrays which are staggered with each other; the Q switch array (3), the wave plate array (4) and the polaroid array (5) are all used for Q modulation of a laser resonant cavity of a laser; the single-lamp multi-rod light-gathering cavity (6) is used for emitting multi-path laser; the plane output mirror (7) is used for forming an emergent end of the laser.

2. The laser for generating a multi-pulse laser sequence according to claim 1, wherein the first mirror array (1) and the second mirror array (2) are both composed of a frame with holes and three fully-reflecting mirror bases, the frame with holes is provided with three fully-reflecting mirror bases in rotational symmetry around a center, the fully-reflecting mirror bases are provided with fully-reflecting mirrors (11), the three fully-reflecting mirror bases of the first mirror array (1) are arranged in an inverted triangle, the three fully-reflecting mirror bases of the second mirror array (2) are arranged in a triangle, and the three fully-reflecting mirror bases are staggered with each other to form a six-way fully-reflecting mirror array.

3. A laser for generating a multi-pulse laser light sequence according to claim 1, wherein the Q-switch array (3) is composed of a base frame and six Q-switches (31), the six Q-switches (31) being arranged on the base frame with rotational symmetry about a center.

4. The laser for generating a multi-pulse laser sequence according to claim 1, wherein the wave plate array (4) comprises a perforated frame and six wave plate bases, the wave plate bases are arranged on the front and back sides of the perforated frame at intervals and are rotationally symmetrical around a center, and the wave plates (41) are arranged on the wave plate bases.

5. A laser for generating a multi-pulse laser train according to claim 1, wherein the polarizer array (5) comprises three frames with polarizers (51) mounted thereon, two polarizers (51) being disposed on each frame, and six polarizers (51) being aligned with six crystal rods (62) of the single-lamp multi-rod condensing cavity (6).

6. A laser for generating a multi-pulse laser train according to claim 1, characterized in that the single-lamp multi-rod collection cavity (6) consists of a centrally located pump xenon lamp (61) and six crystal rods (62) that are rotationally symmetric around the center.