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Inner chamber Raman frequency doubling completely solid yellow laser

An all-solid-state, laser technology, used in lasers, laser parts, phonon exciters, etc., can solve the problems of low fundamental frequency light peak power, poor Raman light efficiency, structural instability, etc., to achieve high output power and Conversion efficiency, stable performance and good stability

Inactive Publication Date: 2008-11-19
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1 of the present invention such as figure 1 As shown, it includes a laser diode LD end-pumping source and a resonant cavity; the resonant cavity is composed of a rear cavity mirror 4 and an output mirror 9, the laser gain medium 5 is Nd:YAG crystal doped with neodymium yttrium aluminum garnet, and the Q-switching device 6 is an acoustic Optical Q-switching device, Raman medium 7-selected strontium tungstate SrWO 4 Crystal, frequency doubling crystal 8 is potassium titanyl phosphate KTP crystal. The laser gain medium 5, the acousto-optic Q-switching device 6, the Raman medium 7 and the frequency-doubling crystal 8 are placed in sequence in the resonator; Surrounded by a metal block with pipes, the pipes in the metal block are continuously circulated with cooling water to cool the crystal.

[0026] The pump source includes LD end pump module 1, optical fiber 2 and coupling lens 3. The pump light enters the resonant cavity through optical fiber 2 and coupling ...

Embodiment 2

[0035] Embodiment 2 of the present invention such as figure 2 As shown, it includes a laser diode LD side pump module 10 and a resonant cavity; the resonant cavity is composed of a rear cavity mirror 4 and an output mirror 9, the laser gain medium 5 is selected from Nd:YAG crystal doped with neodymium yttrium aluminum garnet, and the Q-switching device 6 is Acousto-optic Q-switching device, Raman medium 7 selected barium tungstate BaWO 4 Crystal, frequency doubling crystal 8 is potassium titanyl phosphate KTP crystal. The LD side pump module 10, the laser gain medium 5, the acousto-optic Q-switching device 6, and the Raman medium 7 barium tungstate BaWO are sequentially placed in the resonant cavity 4 Crystal and frequency doubling crystal 8KTP; the sides of the above-mentioned crystals are surrounded by metal blocks with pipes, and the pipes in the metal blocks are continuously circulated with cooling water to lower the temperature of the crystals.

[0036] The laser diode...

Embodiment 3

[0046] 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.%. Place laser gain medium 5 Nd-doped yttrium aluminum garnet Nd:YAG crystal, acousto-optic Q-switching device 6, Raman medium 7 gadolinium vanadate GdVO in sequence in the resonant cavity 4 Crystal and frequency doubling crystal 8 potassium titanyl phosphate KTP crystal, the cavity length of the resonant cavity is 13cm.

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Abstract

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

Claims

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Application Information

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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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