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Q switched laser

A laser and laser technology, applied in the field of optical instruments, can solve the problems of strong electromagnetic noise and pulse instability, limited application, short bearing life, etc., to achieve stable pulse width and repetition frequency, easy to cooperate with each other, and low production cost Effect

Active Publication Date: 2019-01-04
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The laser Q-switching technology is mainly divided into two methods: active Q-switching and passive Q-switching. The active Q-switching method mainly uses mechanical, electro-optic and acousto-optic Q switches. The mechanical Q switch is subject to the influence of multiple pulses, and the noise is very Large, the life of its bearings is short and often requires maintenance
Electro-optic Q-switching requires high voltage driving, which can easily lead to strong electromagnetic noise and pulse instability. At the same time, it is difficult to obtain electro-optic crystals that work in this band.
However, the modulation depth of acousto-optic Q-switching in this band is too low, causing its pulse output to only account for less than 20% of its total output.
These factors limit the application of this type of Q-switching technology in the 2.7-3.0μm band
In the passive Q-switching mode, the pulse width and repetition frequency change with the output power during operation, and it is impossible to obtain controllable pulse laser output through the control terminal, which is greatly limited in various applications.

Method used

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Experimental program
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Embodiment 1

[0037] The Q-switched laser provided in this embodiment includes a first pump source 101, a second pump source 102, a resonant cavity 200, a first Er crystal 301 used as a gain medium, and a second Er crystal 301 used as a Q-switched medium. crystal 302; the first Er crystal 301 and the second Er crystal 302 are arranged at intervals in the resonant cavity 200 along the first direction; the first pump source 101 is located outside the resonant cavity 200, and is used to pump the first Er crystal 301; The second pump source 102 is located outside the resonant cavity 200 and is used to pump the second Er crystal 302; wherein, the first direction is the propagation direction of the laser light generated by the first Er crystal 301 during output.

[0038] Specifically, Er 3+ The energy level is a simple quasi-three-level structure, such as figure 1 As shown, the energy level 4 I 15 / 2 ,energy level 4 I 13 / 2 ,energy level 4 I 11 / 2 , respectively recorded as the ground state e...

Embodiment 2

[0047] figure 2 The structural representation of the Q-switched laser provided for this embodiment, combined below figure 2 The implementation of this embodiment will be described in detail.

[0048] Such as figure 2 As shown, the propagation direction of the laser light generated by the first Er crystal 301 is a straight line during the output process, and the resonator 200 includes a first input mirror 201 and a first output mirror 202, and the first input mirror 201 and the first output mirror 202 are along the The straight line directions are respectively set at the outer ends of the first Er crystal 301 and the second Er crystal 302 .

[0049] Specifically, in this embodiment, the first input mirror 201 , the first Er crystal 301 , the second Er crystal 302 and the first output mirror 202 are sequentially arranged on a straight line, that is, the first direction is the direction of the straight line.

[0050] The following specifically describes the optical path pro...

Embodiment 3

[0055] image 3 The structural representation of the Q-switched laser provided for this embodiment, combined below image 3 The implementation of this embodiment will be described in detail.

[0056] In this embodiment, the propagation direction of the laser light generated by the first Er crystal 301 during the output process is a zigzag line. For example, the propagation direction may be a broken line with an included angle of 60°, or may also be a broken line with an included angle of 90°. The following takes the 90° broken line propagation direction as an example for specific description.

[0057] Such as image 3 As shown, the resonant cavity 200 includes a second input mirror 203, a second output mirror 204, and a plano-concave folded mirror 205. The second input mirror 203 and the second output mirror 204 are respectively arranged on the first Er crystal 301 and the second Er crystal 301 along the broken line direction. At the outer end of the second Er crystal 302,...

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Abstract

A Q-switched laser includes a first pump source, a second pump source, a resonant cavity, and a first Er crystal for acting as a gain medium and a second Er crystal for acting as a Q-switched medium;The first Er crystal and the second Er crystal are spaced apart in the resonant cavity in the first direction; A first pump source located outside the resonant cavity for pumping the first Er crystal;The second pump source is located outside the resonant cavity for pumping the second Er crystal; Wherein the first direction is the propagation direction of the laser light generated by the first Ercrystal in the output process. The Q-switched laser provided by the present application can generate a short-pulse high-power erbium laser in the middle infrared band of 2.7 to 3.0 mum, and the pulsewidth and the repetition rate of the erbium laser are stable and controllable, and the laser has a longer service life.

Description

technical field [0001] The application relates to a Q-switched laser, which belongs to the technical field of optical instruments. Background technique [0002] Er 3+ The ion-activated mid-infrared laser with a wavelength of 2.7-3.0 μm is located in the characteristic absorption band of water molecules, which makes it have attractive application prospects in laser medical treatment and laser beauty. [0003] The erbium lasers currently on the market are all continuous or long-pulse lasers. This kind of laser will generate a large amount of heat accumulation in the body after acting on human tissues, which will lead to high-temperature thermal damage. The short-pulse laser has enough interval time to remove heat from the biological body and reduce the damage caused by thermal damage. At this stage, short pulse emission of laser can be realized through Q-switching technology. [0004] The laser Q-switching technology is mainly divided into two methods: active Q-switching an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/16H01S3/11
CPCH01S3/1127H01S3/1608
Inventor 游振宇涂朝阳王燕朱昭捷李坚富
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI