Coupling cavity Raman frequency doubling completely solid yellow laser

A coupling cavity and all-solid-state technology, applied in lasers, laser components, phonon exciters, etc., can solve the problems of low peak power of fundamental frequency light, poor Raman light efficiency, low power, etc., and achieve high output power and Conversion efficiency, stable performance, and performance-improving effects

Inactive Publication Date: 2008-11-19
SHANDONG UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

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-Raman laser, "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 704mW 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 efficiency of conversion into Raman light is poor, and high-power yellow light output cannot be obtained

Method used

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  • Coupling cavity Raman frequency doubling completely solid yellow laser
  • Coupling cavity Raman frequency doubling completely solid yellow laser

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The inventive device such as figure 1 As shown, it includes a laser diode LD pump source and a resonant cavity. The resonant cavity is composed of a rear cavity mirror 4, a coupling mirror 8 and an output mirror 10. A laser gain medium 5 is placed in the rear cavity mirror 4 and the coupling mirror 8. Nd-doped yttrium aluminum pomegranate Stone Nd:YAG crystal, acousto-optic Q-switching device 6 and Raman medium 7 barium tungstate BaWO 4 Crystal, the frequency doubling crystal 9 potassium titanyl phosphate KTP crystals are placed in the coupling mirror 8 and the output mirror 10; the laser gain medium 5, the acousto-optic Q-switching device 6, the Raman medium 7 and the frequency doubling crystal 9 sides are all used with pipelines Surrounded by a metal block, the pipes inside the metal block are continuously circulated with cooling water to lower the temperature of the crystal.

[0026] The pump source is an end-face pump source, including a laser diode 1, an optical f...

Embodiment 2

[0037] The inventive device such as figure 2 As shown, it includes a laser diode LD pump source and a resonant cavity. The resonant cavity is composed of a rear cavity mirror 4, a coupling mirror 8 and an output mirror 10. A laser gain medium 5 is placed in the rear cavity mirror 4 and the coupling mirror 8. Nd-doped yttrium aluminum pomegranate Stone Nd:YAG crystal, acousto-optic Q-switching device 6 and Raman medium 7 barium tungstate BaWO 4 The frequency doubling crystal 9 potassium titanyl phosphate KTP crystal is placed in the crystal, the coupling mirror and the output mirror; the laser gain medium 5, the acousto-optic Q-switching device 6, the Raman medium 7 and the side of the frequency doubling crystal 9 are all made of metal blocks with pipes Enclosed, the pipes inside the metal block are continuously circulated with cooling water to lower the temperature of the crystal.

[0038] The laser diode LD pumping source is a side pumping source, which is composed of a sid...

Embodiment 3

[0049] Same as Example 1, except that the Raman crystal 7 is gadolinium vanadate GdVO 4 Crystal, size 3×3×15mm 3 , cut along the a-axis direction defined by physics, both ends of the crystal are coated with anti-reflection coatings in the 1000nm-1200nm band (the transmittance is greater than 99.8%); the laser gain medium 5 Nd-doped yttrium aluminum garnet Nd:YAG crystal The impurity concentration is 1.5-at.%. The laser gain medium 5 is placed in the back cavity mirror 4 and the coupling mirror 8 in sequence: Nd:YAG crystal, acousto-optic Q-switching device 6 and Raman medium 7 gadolinium vanadate GdVO 4 The frequency doubling crystal 9 potassium titanyl phosphate KTP crystal is placed in the crystal, the coupling mirror 8 and the output mirror 10, and the cavity length of the resonant cavity is 13 cm.

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Abstract

Disclosed is an all-solid-state double frequency yellow Raman laser device with a coupled cavity, which includes a LD (laser diode) pump source and a resonator. The resonator is composed of a rear cavity mirror, a coupling lens and an output lens; a laser amplifying medium, a Q value adjusting device and a Raman crystal are arranged between the rear mirror and the coupling lens; a frequency doubling crystal is arranged between the coupling lens and the output lens. 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 coupled-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 sc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/108H01S3/109H01S3/11H01S3/0941H01S3/042H01S3/08H01S3/16H01S3/00
Inventor 李述涛张行愚王青圃丛振华陈晓寒刘兆军范书振张琛
Owner SHANDONG UNIV
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