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., and achieve excellent laser performance, high peak power, and large stimulated emission cross section. Effect

Inactive Publication Date: 2008-01-30
NANJING UNIV
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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 operaion 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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] According to Figure 1, a simple and compact all-solid-state Raman laser is produced. Diode laser used for side or end pumping, with a radius of curvature of 600mm, high transmittance to pump light of 808nm wavelength, high reflectivity to 1342nm and 1525nm wavelength laser cavity mirror 1, this is the input mirror; Nd 3+ :YVO 4 Crystal 2 is the laser gain medium; non-doped YVO 4 The crystal 5 is a Raman frequency shift medium; the acousto-optic Q-switch 3 is used to achieve quasi-continuous operation; a flat mirror (cavity mirror), which is highly reflective to the laser with the wavelength of 1342nm and partially transmits the laser with the wavelength of 1525nm, is the output mirror of the laser. 808nm laser diode pumped Nd 3+ :YVO 4 Crystal 2 generates laser light with a wavelength of 1342nm, which passes through undoped YVO 4 Crystal 5 produces Raman frequency shift from 1342nm fundamental frequency light to 1525nm wavelength Raman laser. Here, two mirror cavities are u...

Embodiment 2

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

Embodiment 3

[0046] According to Figure 3, an all-solid-state Raman laser with a three-mirror folded cavity was fabricated. Diode laser used for side or end pumping, with a radius of curvature of 600mm, high transmittance to pump light of 808nm wavelength, high reflectivity to 1342nm and 1525nm wavelength laser cavity mirror 1, this is the input mirror; Nd 3+ :YVO 4 Crystal 2 is the laser gain medium; non-doped YVO 4 The crystal is a Raman frequency-shifting medium; the acousto-optic Q-switch is used to achieve quasi-continuous operation; a plano-concave mirror, high reflection for the 1342nm fundamental frequency light and 1525nm Raman laser; non-doped YVO 4 Crystal 5 is a Raman frequency-shifting medium; a flat mirror (cavity mirror), which is highly reflective to the laser with a wavelength of 1342nm, partially transmits the laser with a wavelength of 1525nm, and is the output mirror of the laser. 808nm laser diode pumped Nd 3+ :YVO 4 Crystal 2 generates laser light with a wavelength of 134...

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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 a laser, in particular to an all-solid-state split Raman laser. Background technique [0002] In 1995, the University of Arizona Optical Research Center J.T. Murray et al. obtained a solid-state Raman laser close to the diffraction limit, and used a flash lamp pumped solid-state laser as a pump source to pump the Raman active crystal Ba(NO 3 ) 2 , A Raman laser with a repetition frequency of 100 Hz and a wavelength of 1.56 μm is obtained. Although the eye-safe solid-state Raman laser with a wavelength of 1.5xμm started late, it has greater advantages in terms of high power, high repetition rate and beam quality compared with other eye-safe lasers. With the solid Raman medium With the maturity and provision of growth technology, human eye-safe Raman lasers have more development prospects. Its future development direction is to combine with diode-pumped solid-state laser technology to give full play to its own advantages to high effic...

Claims

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Application Information

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Patent Type & Authority Patents(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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