Separation type Raman laser in full solid state

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...

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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

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