Separation type Raman laser in full solid state

A Raman laser, split technology, applied in the field of lasers, can solve the problems of limiting laser output power level and beam quality, laser output energy level limitation, etc., to achieve excellent laser performance, high peak power, and good beam quality.

Inactive Publication Date: 2006-04-19
NANJING UNIV
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  • Application Information

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Problems solved by technology

[0007] In May 2002, N.TAKEI et al. published an article on Appl.Phys.B "Eye-safe Ba(NO 3 ) 2 Crystal cascade Raman laser (20-Hz operation of an eye-safe cascade Raman laser with a Ba(NO 3 ) 2 crystal)”, using a 1064nm Q-switched Nd:YAG laser to pump Ba(NO 3 ) 2 Crystal, through the third-order Raman frequency shift, the laser output with a safe wavelength of 1598nm for human eyes is obtained, but due to the strong thermal effect caused by the low-order Raman frequency shift, the laser output energy level is greatly limited
Since Nd:YVO 4 (or Nd:GdVO 4 ) crystal is used as laser gain medium and Raman frequency shift crystal at the same time, the thermal lens effect seriously limits the laser output power level and beam quality

Method used

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  • Separation type Raman laser in full solid state
  • Separation type Raman laser in full solid state
  • Separation type Raman laser in full solid state

Examples

Experimental program
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Effect test

Embodiment 1

[0042] according to figure 1 Make a simple and compact all-solid-state Raman laser. Diode lasers for side or end pumping, a cavity mirror 1 with a curvature radius of 600mm, high transparency for 808nm wavelength pump light, and high reflection for 1342nm and 1525nm wavelength lasers, this is the input mirror; Nd 3+ :YVO 4 Crystal 2 is the laser gain medium; undoped YVO 4 Crystal 5 is a Raman frequency shift medium; acousto-optic Q-switch 3 is used to realize quasi-continuous operation; a flat mirror (cavity mirror), which is highly reflective to 1342nm wavelength laser and partially transparent to 1525nm wavelength laser, is the output mirror of the laser. 808nm laser diode pumped Nd 3+ :YVO 4 Crystal 2 produces a laser with a wavelength of 1342nm, and passes through undoped YVO 4 Crystal 5 generates Raman frequency shift from 1342nm fundamental frequency light to 1525nm wavelength Raman laser. Here, two mirror cavities are used, 1342nm and 1525nm are obtained in the sam...

Embodiment 2

[0044] according to figure 2 Make a simple and compact all-solid-state Raman laser. Diode laser for side pumping, a cavity mirror 1 with a radius of curvature of 600mm, high transparency for pump light with a wavelength of 808nm, and high reflection for a laser with a wavelength of 1342nm, this is the input mirror; Nd 3+ :YVO 4 Crystal 2 is the laser gain medium; undoped YVO 4 The crystal 3 is a Raman frequency shift medium; the acousto-optic Q-switch 4 is used to realize the quasi-continuous operation; a flat mirror (cavity mirror), a faces the 1342nm fundamental frequency light with high transparency, b faces the 1342nm fundamental frequency light with high transparency, High reflection to 1525nm Raman laser; undoped YVO 4 The crystal is a Raman frequency shift medium; a flat mirror (cavity mirror), which is highly reflective to the 1342nm wavelength laser and partially transmits to the 1525nm wavelength laser, is the output mirror of the laser. 808nm laser diode pumped...

Embodiment 3

[0046] according to image 3 Fabricate an all-solid-state Raman laser with a three-mirror folded cavity. Diode lasers for side or end pumping, a cavity mirror 1 with a curvature radius of 600mm, high transparency for 808nm wavelength pump light, and high reflection for 1342nm and 1525nm wavelength lasers, this is the input mirror; Nd 3+ :YVO 4 Crystal 2 is the laser gain medium; undoped YVO 4 The crystal is a Raman frequency-shifting medium; the acousto-optic Q-switch is used to realize quasi-continuous operation; a plano-concave mirror is highly reflective to 1342nm fundamental frequency light and 1525nm Raman laser; doped-free YVO 4 The crystal 5 is a Raman frequency-shifting medium; a flat mirror (cavity mirror), which is highly reflective to the 1342nm wavelength laser and partially transmissive to the 1525nm wavelength laser, is the output mirror of the laser. 808nm laser diode pumped Nd 3+ :YVO 4 Crystal 2 produces a laser with a wavelength of 1342nm, and passes thr...

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Abstract

The Raman laser with simple compact structure includes pump system of diode laser end face, laser cavity composed of coated laser input / output cavity mirrors, independent laser gain crystal placed in laser cavity, Raman frequency shift crystal and turning Q unit for laser. Output Raman laser is obtained from laser in quasi continuous operation. Laser gain crystal is Nd:YVO4 crystal, doping Nd3+ laser crystal or doping Yb3+:YAG etc. laser crystals, which generate laser oscillations with wavelengths near to 1.34 micro or 1.06 micro. Raman frequency shift crystal is prepared from one piece of single crystal as Raman active medium. Here, the Raman frequency shift crystal is undoped YVO4 crystal etc. in the invention, laser gain crystal and Raman frequency shift crystal are independent from each other so as to raise output power and beam quality of laser since heat effect does not occur.

Description

technical field [0001] The invention relates to lasers, in particular to an all-solid-state split Raman laser. Background technique [0002] In 1995, J.T.Murray and others at the Optical Research Center of the University of Arizona in the United States obtained a solid-state Raman laser close to the diffraction limit, and used a solid-state laser pumped by a flash lamp as a pump source to pump the Raman active crystal Ba(NO 3 ) 2 , to obtain a Raman laser with a repetition frequency of 100 Hz and a wavelength of 1.56 μm. Although the eye-safe solid-state Raman laser with a wavelength of 1.5x μm started late, it has great advantages in high power, high repetition rate and beam quality compared with other eye-safe lasers. With the maturity and provision of dielectric growth technology, eye-safe Raman lasers have more development prospects. Its future development direction is to combine with diode-pumped solid-state laser technology, and give full...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/108H01S3/16H01S3/08H01S3/00
Inventor 樊亚仙刘源王琴侯玉娥陈璟丁剑平王慧田闵乃本
Owner NANJING UNIV
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