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Wavelength converting system and method

A wavelength conversion and conversion process technology, applied in the field of lasers, can solve problems such as difficult beam quality and poor laser beam quality, and achieve the effect of good beam quality, compact structure and high efficiency

Inactive Publication Date: 2010-11-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this solution is that it is difficult to obtain better beam quality when the parametric light generated by the KTP crystal is about 2 μm, resulting in poor quality of the 3-5 μm laser beam generated by ZGP

Method used

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  • Wavelength converting system and method

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Experimental program
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Effect test

Embodiment 1

[0045] Such as figure 1 As shown, the wavelength conversion system includes a cascaded laser pump source, a Raman laser and a KTA crystal, wherein the laser pump source is composed of the first resonant cavity and the laser crystal, and the first cavity mirror 1 and the second laser crystal connected at both ends of the laser crystal Two cavity mirrors 2 form the first resonant cavity; the Raman laser is composed of the second resonant cavity and the Raman conversion medium (that is, the Raman crystal), and the third cavity mirror 3 and the fourth cavity mirror 4 connected to the two ends of the Raman crystal form The second resonant cavity; both ends of the KTA crystal are respectively connected to the fifth cavity mirror 5 and the sixth cavity mirror 6 to form an optical parametric oscillator, and the fifth cavity mirror 5 and the sixth cavity mirror 6 form a third resonant cavity. Auxiliary elements are respectively connected between the first resonant cavity and the second...

Embodiment 2

[0048] Such as figure 2 As shown, the wavelength conversion system includes a cascaded laser pump source, a Raman laser and a KTA crystal, wherein the laser pump source is composed of the first resonant cavity and the laser crystal, and the first cavity mirror 1 and the second laser crystal connected at both ends of the laser crystal The three-cavity mirror 3 forms the first resonant cavity; the Raman laser is composed of the second resonant cavity and the Raman conversion medium (ie, the Raman crystal), and the third cavity mirror 3 and the fourth cavity mirror 4 connected at both ends of the Raman crystal form The second resonant cavity; both ends of the KTA crystal are respectively connected to the fifth cavity mirror 5 and the sixth cavity mirror 6 to form an optical parametric oscillator, and the fifth cavity mirror 5 and the sixth cavity mirror 6 form a third resonant cavity. Auxiliary elements are respectively connected between the second resonant cavity and the third ...

Embodiment 3

[0051] Such as image 3 As shown, the wavelength conversion system includes a cascaded laser pump source, a Raman laser and a KTA crystal, wherein the laser pump source is composed of the first resonant cavity and the laser crystal, and the first cavity mirror 1 and the second laser crystal connected at both ends of the laser crystal Two cavity mirrors 2 form the first resonant cavity; the Raman laser is composed of the second resonant cavity and the Raman conversion medium (ie, the Raman crystal), and the third cavity mirror 3 and the fifth cavity mirror 5 connected to both ends of the Raman crystal form The second resonant cavity; both ends of the KTA crystal are respectively connected to the fifth cavity mirror 5 and the sixth cavity mirror 6 to form an optical parametric oscillator, and the fifth cavity mirror 5 and the sixth cavity mirror 6 form a third resonant cavity. An auxiliary element is connected between the first resonant cavity and the second resonant cavity, and...

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Abstract

The invention relates to a wavelength converting system and a wavelength converting method. The system comprises a laser pumping source, a Raman laser and a KTA crystal which are cascaded, wherein the laser pumping source is used for generating pumping light and inputting the pumping light to the Raman laser; the Raman laser is used for performing Raman transform after receiving the pumping light and outputting laser to the KTA crystal; and the KTA crystal is used for performing an optical parameter conversion process by adopting a non-critical matching mode or a 90-degree critical matching mode after receiving the laser output by the Raman laser. The system and the method expand the laser frequency variation range of the crystal; the converting system is convenient to avoid the walk-off effect by using a larger effective nonlinear coefficient of the nonlinear crystal, simplifies the design of an optical parameter converter, and improves the conversion efficiency and stability; and the system has the advantages of compact structure, good beam quality and high efficiency.

Description

technical field [0001] The invention relates to the technical field of lasers, in particular to a wavelength conversion system and method based on the Raman effect and the optical parameter conversion effect. Background technique [0002] There are many ways to achieve laser frequency conversion, such as optical parameter generation, oscillation, amplification, sum frequency, difference frequency, and Raman frequency shift. [0003] If the laser propagates in a nonlinear crystal and satisfies the condition of phase matching (energy conservation + momentum conservation), the conversion of optical parameters can occur. Optical parameter oscillation, amplification, sum frequency, difference frequency, etc. all use this principle. In the optical parametric oscillator, the wavelength of the parametric light can be adjusted by adjusting the matching conditions of the crystal (for example, the matching angle), so as to obtain a wavelength-tunable laser source. Commonly used nonlin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/094H01S3/30H01S3/10G02F2/02
Inventor 巩马理王巍刘建辉黄磊闫平张海涛
Owner TSINGHUA UNIV
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