High-power inner cavity frequency doubling single-frequency laser device

A high-power, laser technology, applied in the direction of lasers, laser components, phonon exciters, etc., can solve the problem of laser stable zone narrowing, achieve the effect of widening the stable zone, eliminating the impact, and facilitating stable operation

Inactive Publication Date: 2015-06-24
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method only passively adapts to the thermal lens effect of the TGG crystal, and shortening the cavity length will narrow the stable region of the laser

Method used

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  • High-power inner cavity frequency doubling single-frequency laser device
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  • High-power inner cavity frequency doubling single-frequency laser device

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0029] Implementation mode one: image 3 A high-power intracavity double-frequency single-frequency laser designed for the present invention includes a pump source 1, a gain crystal 2, a ring resonator composed of cavity mirrors (10, 11, 12, 13), and a permanent The magneto-optical medium 3 and the half-wave plate 4 in the magnet form a one-way device, a frequency doubling crystal 6 and a DKDP compensation plate 5 . The central wavelength of the pump source 1 is 888nm, the fiber core diameter is 400μm, the numerical aperture is 0.22, and the maximum output power is 90W. Using 888nm pump light, on the one hand, the heat generated by the quantum deficit can be reduced by direct pumping, and on the other hand, the non-polarized absorption characteristics of the gain crystal 2 can improve the stability of the laser operation. The pump light is focused to the center of the gain crystal 2 through the coupling system. The laser adopts a four-mirror ring resonant cavity structure, w...

Embodiment approach 2

[0030] Implementation mode two: Figure 4 Shown is a six-mirror ring-cavity single-frequency intracavity frequency-doubled laser pumped by the side of a laser diode, including a pump source 1, a gain crystal 2, and a cavity mirror (20, 21, 22, 23, 24, 25) A ring resonant cavity, a one-way device composed of a magneto-optical medium 3 and a half-wave plate 4 placed in a permanent magnet, a frequency doubling crystal 6 and a DKDP compensation plate 5. The light emitted by the pump source 1 is projected onto the gain crystal 2 after shaping and focusing, and the wavelength of the pump light is located at the absorption peak of the gain crystal 2 . Gain crystal 2 is an anisotropic crystal, such as Nd:YVO 4 , Nd:YAP, Nd:YLF, etc. A light-transmitting surface of the gain crystal 2 is cut into a certain wedge angle, which can function as a polarization beam splitter, so as to maintain the stability of the polarization state of the laser. The resonant cavity is composed of four pla...

Embodiment approach 3

[0031] Implementation mode three: Figure 5 Shown is a six-mirror annular cavity continuous single-frequency intracavity frequency-multiplied laser pumped by a laser diode at both ends, including a pump source 1, a gain crystal 2, and a cavity mirror (30, 31, 32, 33, 34, 35 ) composed of a ring resonant cavity, a one-way device composed of a magneto-optical medium 3 and a half-wave plate 4 placed in a permanent magnet, a frequency doubling crystal 6 and a DKDP compensation plate 5. Compared with Embodiment 2, the main difference is that the pumping method is changed from side pumping to double-end pumping. The two end surfaces of the gain crystal 2 and the cavity mirrors 20 and 21 are coated with a high-transmittance film for pump light.

[0032] The core of the present invention is to dynamically compensate the thermal lens effect of the magneto-optical medium in the one-way device with a certain thickness of optical crystal thin slices with negative thermo-optic coefficient...

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Abstract

The invention provides a high-power inner cavity frequency doubling single-frequency laser device. The high-power inner cavity frequency doubling single-frequency laser device comprises a pumping source (1), a gain crystal (2), a ring-shaped resonant cavity, an isolator, a frequency doubling crystal (6) and a thermal lens effect compensating plate (5), wherein the isolator is composed of a magneto-optical medium (3) and a half wave plate (4) which are placed in a permanent magnet. The thermal lens effect compensating plate (5) is placed close to the magneto-optical medium (3). The thermal lens effect compensating plate (5) is an optical crystal thin plate with a certain thickness, has a negative thermo-optical coefficient and is provided with two parallel light-transmitting faces. The thermal lens effect of the magneto-optical medium (3) can be dynamically compensated for. The thermal lens effect of the magneto-optical medium is dynamically compensated for through the crystal thin plate with a certain thickness and a negative thermo-optical coefficient, the inside-cavity light beam quality degradation caused by the thermal lens effect of the magneto-optical medium can be relieved or eliminated, the stable area of the laser device is expanded, and therefore the high-power inner cavity frequency doubling single frequency laser device stably running is obtained.

Description

technical field [0001] The invention relates to a single-frequency laser, in particular to an inner-cavity frequency-multiplied single-frequency laser capable of realizing high-power output. Background technique [0002] All-solid-state intracavity frequency-doubled single-frequency lasers have the advantages of high output power, good beam quality, and low intensity noise, and are widely used in scientific research, national defense construction, biomedicine, information industry and other fields. High-power all-solid-state CW intracavity frequency-multiplied single-frequency lasers usually use a ring resonator with an optical one-way device to select the mode by eliminating the spatial hole-burning effect, so as to realize the single-frequency operation of the laser. The optical one-way device includes a Faraday rotator and a half-wave plate, and the Faraday rotator is composed of a permanent magnet and a magneto-optical medium placed in its clear aperture. Single crystal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/109H01S3/10H01S3/16H01S3/091
Inventor 卢华东苏静尹祺巍彭堃墀
Owner SHANXI UNIV
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