Folding cavity self-raman frequency doubling completely solid yellow laser

Abstract

Disclosed is an all-solid-state double frequency yellow Raman laser device with a folded cavity, which includes a LD (laser diode) pump source and a resonator. The resonator is composed of a rear cavity mirror, a 45 degrees reflection mirror and a total reflective mirror. The laser device of the invention is characterized in that a laser amplifying medium, a Q value adjusting device, a Raman crystal are arranged between the rear cavity mirror and the 45 degrees reflection mirror of the resonator; a frequency doubling crystal is arranged between the 45 degrees reflection mirror and the total reflective mirror. The temperature of the laser amplifying medium, the Q value adjusting device, the Raman crystal and the frequency doubling crystal is controlled by a cooling device. Compared with prior art, the laser device of the invention has small volume, high output power and high conversion efficiency. Due to the small volume, stable performance and low cost, the laser device can be widely used in laser medical treatment field.

Description

(1) Technical field [0001] The invention relates to a solid-state laser, in particular to a folded-cavity Raman frequency-doubling all-solid-state yellow laser. (2) Background technology [0002] Laser technology is one of the major inventions of the 20th century, and it has been widely used in various fields such as industrial production, communication, information processing, medical and health, military affairs, cultural education, and scientific research. With the major breakthroughs in semiconductor laser diode technology, solid-state lasers have been strongly developed, and their application fields have been continuously expanded. The all-solid-state laser pumped by LD is a second-generation new solid-state laser with high efficiency, stability, good beam quality, long life and compact structure. It has become one of the key development directions of laser science. It is used in space communication, optical fiber communication , Atmospheric research, environmental sci...

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Problems solved by technology

The sum-frequency method has the disadvantages of large volume, low power, poor conversion efficiency, unstable structure, and difficulty in realization; the method of frequency-doubling Raman light is simpler than the method of sum-frequency, but most of the world uses extracavity frequency-doubling Raman light at present. Mann's method (Low threshold, diode end-pumped Nd 3+ :GdVO 4 self-Ramanlaser, "Optical Materials", Vol.29, 2007, 1817-1820) and intracavity frequency-doubling continuous Raman light method (Efficient all-solid-state yellow laser source producing 1.2-W average power, "Optics Letters ", Vol.24, 1999, 1490-1492; All-solid-state 704 mW continuous-waveyellow source based on an intracavity, frequency-doubled crystalline Raman laser, "Optics Letters", Vol.32, 2007, 1114-1116)

The method of frequency doubling Raman light outside the cavity is poor in frequency doubling efficiency due to the low power of Raman light outside the cavity, and the output yellow light power is low; while the method of frequency doubling continuous Raman light in the cavity is due to the peak power of the fundamental frequency light Low, the conversion efficiency into Raman light is poor, and high-power yellow light output cannot be obtained

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