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Full-solid-state single longitudinal mode yellow light laser

A single longitudinal mode, all-solid-state technology, applied in lasers, laser parts, phonon exciters, etc., can solve the problems of unstable laser output power, high difficulty in manufacturing mode selection components, and easy to destroy single longitudinal mode operation. Achieve the effect of eliminating multi-longitudinal mode oscillation, reducing the number of components in the cavity, and small volume

Active Publication Date: 2014-03-05
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, an important problem faced by existing self-Raman lasers is that there are multiple longitudinal mode oscillations in the resonator, resulting in unstable output power of the laser, and the output spectrum contains multiple spectral lines
Existing methods of controlling the linewidth of lasers using mode selection elements such as etalons or volume gratings have problems such as high difficulty in manufacturing mode selection elements, and changes in pump power or cavity length are likely to damage the single longitudinal mode operation.

Method used

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  • Full-solid-state single longitudinal mode yellow light laser
  • Full-solid-state single longitudinal mode yellow light laser

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The specific selection parameters of each optical element of the all-solid-state single longitudinal mode yellow laser in this embodiment are: the pump source 1 adopts an LD end pump source, the laser diode provides 808nm pump light, and the maximum output power is 20W. Cooling device; the core diameter of the coupling fiber in the optical coupling system 2 is Φ200, the numerical aperture is 0.22, and the collimating and focusing lenses are coated with an 808nm antireflection film; the input mirror 31 is a plane mirror, the outside of which is coated with an 808nm antireflection film, and the inside There are 1000nm~1200nm high reflection film, the reflectivity is greater than 90%; the output mirror 32 adopts a concave mirror, the radius of curvature of the concave mirror is 100mm, the inner side of the output mirror 32 is coated with 500nm~600nm visible light band anti-reflection film, and coated with 1000nm~ 1200nm high reflection film, the reflectivity is greater than...

example 1

[0037] The same structure and parameter selection of this embodiment are basically the same as those of Embodiment 1, the only difference is that the self-Raman crystal 33 uses c-axis cut Nd:YVO 4 , the doping concentration is 1at.%, and the size is 4×4×10mm. Nd:YVO 4 The two transparent surfaces of the crystal are coated with anti-reflection coatings for 808nm and 1000~1200nm bands, Nd:YVO 4 The temperature of the crystal is controlled at about 25°C; the frequency doubling crystal 36 is made of bismuth borate BIBO, and the cutting angle of the crystal satisfies the type I phase matching condition θ=177.3°, The size is 4×4×5mm, both ends are coated with 1000-1200nm and 500-600nm band anti-reflection coatings, and the temperature of bismuth borate BIBO is controlled at room temperature in order to achieve the best frequency doubling efficiency. The specific optical path propagation process and examples 1 are identical and will not be repeated here.

Deformed example 2

[0039] The same structure and parameter selection of this embodiment are basically the same as those of Embodiment 1, the only difference is that the self-Raman crystal 33 uses c-axis cut Nd:LuVO 4 , the doping concentration is 0.3at.%, the crystal size is 4×4×20mm, Nd:LuVO 4 Anti-reflection coatings for 808nm and 1000-1200nm bands are coated on the two transparent surfaces of the Nd:LuVO 4 The temperature is controlled at about 25°C; the frequency doubling crystal 36 is made of lithium triborate (LBO), and the cutting angle satisfies the type I phase matching condition θ=90°, The size is 4×4×5mm, both ends are coated with anti-reflection coatings for 1000-1200nm and 500-600nm bands, and the temperature of lithium triborate (LBO) is controlled at room temperature to achieve the best frequency doubling efficiency.

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Abstract

The invention relates to a full-solid-state single longitudinal mode yellow light laser which is characterized in that pump light emitted from a pump source is collimated and focused through an optical coupling system and is emitted to a self-Raman crystal through an input mirror, and the self-Raman crystal absorbs base frequency light generated by pump light energy in a self-Raman resonant cavity; the base frequency light is spread in the self-Raman resonant cavity in a reciprocating mode, is polarized through a Brewster window to form linear polarized light, lambda / 4 wave plate combination is used for enabling light spread in the self-Raman crystal on the inner side of the lambda / 4 wave plate combination to be circular polarized light and light spread in the self-Raman crystal on the outer side of the lambda / 4 wave plate combination to be linear polarized light, and therefore multimode oscillation caused by space burning holes can be effectively eliminated, and single longitudinal mode base frequency light is output; when the light field strength of the base frequency light gradually increases to reach a Raman threshold, the single longitudinal mode base frequency light is subjected to stimulated Raman scattering of the self-Raman crystal and is converted to single longitudinal mode Stokes light, and the Stokes light passes through a frequency doubling crystal to generate single longitudinal mode yellow light which is output to the outside of the cavity through an output mirror or a beam splitter. The full-solid-state single longitudinal mode yellow light laser can be widely applied to the manufacturing process of full-solid-state single longitudinal mode yellow light lasers.

Description

technical field [0001] The invention relates to an all-solid-state laser, in particular to an all-solid-state single longitudinal mode yellow laser. Background technique [0002] In recent years, the stimulated Raman scattering effect, as an effective means of frequency conversion, has been widely used in the design of all-solid-state lasers to expand the output spectrum of the laser, among which the intracavity self-Raman laser has attracted much attention. It is characterized by using one crystal as the laser gain medium and Raman gain medium at the same time, which greatly simplifies the structure of the resonant cavity, reduces the number of surfaces in the cavity, and effectively reduces the loss in the cavity. It is especially suitable for miniaturization, low threshold, high efficient Raman lasers. With the continuous improvement of crystal growth and doping technology, self-Raman crystals with both laser activity and Raman activity are emerging, and the research on ...

Claims

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Application Information

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IPC IPC(8): H01S3/08H01S3/108
Inventor 李小丽谈宜东张书练
Owner TSINGHUA UNIV
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