CN216121194U

CN216121194U - Annular 4 lead to laser amplifier

Info

Publication number: CN216121194U
Application number: CN202122405852.7U
Authority: CN
Inventors: 李磊; 邓明发; 孙维娜; 谭希言
Original assignee: Beijing Oriental Sharp Laser Technology Co ltd
Current assignee: Beijing Oriental Sharp Laser Technology Co ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2022-03-22
Anticipated expiration: 2031-09-30

Abstract

The utility model provides an annular 4-pass laser amplifier, which comprises a polarizer A, a Faraday magneto-optical rotator, a half wave plate A, a polarizer B, a lens A, a lens B, a polarizer C and the like, wherein the polarizer A, the Faraday magneto-optical rotator, the half wave plate A, the polarizer B, an amplification gain medium, the lens A and a pumping source are sequentially arranged on the same horizontal line, the lens B and the polarizer B are positioned on the same vertical line, the lens B and the polarizer C are positioned on the same horizontal line, the lens A, the half wave plate B, the polarizer C and a total reflection mirror are sequentially arranged on the same vertical line, and the polarizer B, the lens A, the polarizer C and the lens B form an annular light path. According to the utility model, the seed laser passes through the gain medium for 4 times in the same path by controlling the polarization state of the laser, and the seed laser and the pump laser have the same light path, so that the conversion efficiency is improved, and the shape of the seed laser is not changed.

Description

Annular 4 lead to laser amplifier

Technical Field

The utility model belongs to the field of laser amplifiers, and particularly relates to an annular 4-channel laser amplifier.

Background

For a large-energy and narrow-pulse-width laser, a scheme of a main oscillator and an amplifier is mostly adopted at present to realize large-energy laser output. The amplification of small signals usually employs single-pass amplification, multi-pass amplification and regenerative amplification. In several amplification modes, the multi-pass amplification gain multiplying power is more efficient, and the engineering application is wider. At present, the multi-pass amplification mostly adopts an angle multiplexing mode, wherein the angle multiplexing mode is that the seed laser and the amplified laser pass through a gain medium for multiple times in different optical paths by utilizing a reflector. The overlap ratio of the laser of the angle multiplexing amplification structure and the pumping area of the gain medium is low, so that the amplification and extraction efficiency is low; the gain medium is mostly in the form of a slab, and the final output light spot is generally elliptical.

Disclosure of Invention

Aiming at the technical problems in the prior art, the utility model provides the annular 4-pass laser amplifier, seed laser passes through a gain medium for 4 times in the same path by controlling the polarization state of laser, and the seed laser and pump laser have the same optical path, so that the conversion efficiency is improved, and the shape of the seed laser cannot be changed.

The technical scheme adopted by the utility model is as follows: an annular 4-pass laser amplifier comprises a polarizer A, a Faraday magneto-optical rotator, a half wave plate A, a polarizer B, a lens A, a lens B, a polarizer C, a half wave plate B, an amplification gain medium, a holophote and a pumping source, wherein the polarizer A, the Faraday magneto-optical rotator, the half wave plate A, the polarizer B, the amplification gain medium, the lens A and the pumping source are sequentially arranged on the same horizontal line, the lens B and the polarizer B are positioned on the same vertical line, the lens B and the polarizer C are positioned on the same horizontal line, the lens A, the half wave plate B, the polarizer C and the holophote are sequentially arranged on the same vertical line, and the polarizer B, the lens A, the polarizer C and the lens B form an annular light path; the polarizer A, the polarizer B and the polarizer C are used for reflecting the vertically polarized light and transmitting the horizontally polarized light; the Faraday magneto-optical rotator is used for rotating the laser polarization state by 45 degrees; the half wave plate A is used for rotating the polarization state of the laser by 45 degrees; the lens A and the lens B are both high-reflection lenses for seed laser wavelength and high-transmission lenses for pump light wavelength; and the half wave plate B is used for rotating the polarization state of the laser by 90 degrees.

Furthermore, the Faraday magneto-optical rotator is matched with the half-wave plate A for use, so that the polarization state of the seed laser is rotated by 90 degrees, and the polarization state of the amplified output laser is not changed.

Further, the half wave plate B is replaced by a 90-degree Faraday magneto-optical rotator.

Compared with the prior art, the utility model has the beneficial effects that: the utility model amplifies the seed laser 4 times through the gain medium by a polarization control mode, can fully extract the energy stored in the gain medium under the limited volume and improve the amplification efficiency. The laser and gain medium pumping area has high coincidence degree, and has higher conversion efficiency relative to angle multiplexing; the final amplified light spot is circular, and the quality of the light beam is good. The utility model is applied to high-power laser amplification, and is beneficial to obtaining amplified laser output with small volume, high efficiency and high power.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

In the figure, 1-polarizer A, 2-Faraday magneto-optical rotator, 3-half wave plate A, 4-polarizer B, 5-lens A, 6-lens B, 7-polarizer C, 8-half wave plate B, 9-amplification gain medium, 10-holophote and 11-pumping source.

Detailed Description

In order to make the technical solutions of the present invention better understood, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

An embodiment of the present invention provides a ring-shaped 4-pass laser amplifier, as shown in fig. 1, which includes a polarizer a1, a faraday magneto-optical rotator 2, a half-wave plate A3, a polarizer B4, a lens a5, a lens B6, a polarizer C7, a half-wave plate B8, an amplification gain medium 9, a total reflection mirror 10, and a pump source 11. The polarizer A1, the Faraday magneto-optical rotator 2, the half-wave plate A3, the polarizer B4, the amplification gain medium 9, the lens A5 and the pump source 11 are sequentially arranged on the same horizontal line, the polarizer B4 and the lens B6 are positioned on the same vertical line, the lens B6 and the polarizer C7 are positioned on the same horizontal line, the lens A5, the half-wave plate B8, the polarizer C7 and the total reflection mirror 10 are sequentially arranged on the same vertical line, and the polarizer B4, the lens A5, the polarizer C7 and the lens B6 form a ring-shaped light path.

The polarizer a1, polarizer B4, and polarizer C7 are all used for reflection of vertically polarized light and transmission of horizontally polarized light. The Faraday magneto-optical rotator 2 is used for rotating the polarization state of laser by 45 degrees, and the half-wave plate A3 is used for rotating the polarization state of laser by 45 degrees; the Faraday magneto-optical rotator and the half wave plate A are matched for use, so that the polarization state of the seed laser is rotated by 90 degrees, and the polarization state of the amplified output laser is not changed. The lens A5 and the lens B6 are both high-reflection lenses for the seed laser wavelength and high-transmission lenses for the pump light wavelength; the half wave plate B8 is used for rotating the polarization state of the laser by 90 degrees. The total reflector 10 is a 0-degree laser total reflector. A pump source 11 provides a pump for the amplification gain medium 9.

The polarization state of the seed laser is vertical polarization, the seed laser emits to a polarizer A1, is reflected by a polarizer A1, and is changed into horizontal polarized light after passing through a Faraday magneto-optical rotator 2 and a half wave plate A3; the laser light passes through a polarizer B4 and is subjected to 1-pass amplification through an amplification gain medium 9; the 1-pass amplified laser is reflected by a lens A5, is changed into vertical polarization in a polarization state after passing through a half wave plate B8, and then enters an amplification gain medium 9 for 2-pass amplification after sequentially passing through a polarizer C7, a lens B6 and a polarizer B4 for reflection; the polarization is changed into horizontal polarization after being reflected by the lens A5 and transmitted by the half wave plate B8 again, the polarization is changed into vertical polarization after being transmitted by the polarizer C7, reflected by the holophote 10, transmitted by the polarizer C7 and transmitted by the half wave plate B8, and the polarization enters the amplification gain medium 9 for 3-pass amplification after being reflected by the lens A5; the polarization is changed into horizontal polarization after being reflected by a polarizer B4, a lens B6 and a polarizer C7 and transmitted by a half-wave plate B8, and the polarization enters an amplification gain medium 9 for 4-pass amplification after being reflected by a lens A5; and then the light is transmitted by a polarizer B4, a half-wave plate A3, a Faraday magneto-optical rotator 2 and a polarizer A1 in sequence and then output.

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 utility model is defined by the claims. The technical solutions of the present invention or those skilled in the art, based on the teaching of the technical solutions of the present invention, should be considered to be within the scope of the present invention, and all equivalent changes and modifications made within the scope of the present invention or equivalent technical solutions designed to achieve the above technical effects are also within the scope of the present invention.

Claims

1. A ring-shaped 4-pass laser amplifier, characterized by: the device comprises a polarizer A, a Faraday magneto-optical rotator, a half-wave plate A, a polarizer B, a lens A, a lens B, a polarizer C, a half-wave plate B, an amplification gain medium, a holophote and a pumping source, wherein the polarizer A, the Faraday magneto-optical rotator, the half-wave plate A, the polarizer B, the amplification gain medium, the lens A and the pumping source are sequentially arranged on the same horizontal line, the polarizer B and the lens B are positioned on the same vertical line, the lens B and the polarizer C are positioned on the same horizontal line, the lens A, the half-wave plate B, the polarizer C and the holophote are sequentially arranged on the same vertical line, and the polarizer B, the lens A, the polarizer C and the lens B form an annular light path; the polarizer A, the polarizer B and the polarizer C are used for reflecting the vertically polarized light and transmitting the horizontally polarized light; the Faraday magneto-optical rotator is used for rotating the laser polarization state by 45 degrees; the half wave plate A is used for rotating the polarization state of the laser by 45 degrees; the lens A and the lens B are both high-reflection lenses for seed laser wavelength and high-transmission lenses for pump light wavelength; the half wave plate B is used for rotating the polarization state of the laser by 90 degrees.

2. The ring-shaped 4-pass laser amplifier according to claim 1, wherein: the Faraday magneto-optical rotator is matched with the half wave plate A for use, and is used for rotating the polarization state of the seed laser by 90 degrees without changing the polarization state of the amplified output laser.

3. The ring-shaped 4-pass laser amplifier according to claim 1, wherein: and the half wave plate B is replaced by a 90-degree Faraday magneto-optical rotator.