Device for generating fourth harmonic beam

A fourth harmonic generation device technology, applied in the field of lasers, can solve the problem of low fourth harmonic laser power

Inactive Publication Date: 2020-03-27
富通尼激光科技(东莞)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the fourth harmonic laser power of th

Method used

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  • Device for generating fourth harmonic beam
  • Device for generating fourth harmonic beam
  • Device for generating fourth harmonic beam

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Embodiment Construction

[0020] The present invention will be further described in detail below in conjunction with the examples.

[0021] According to the present invention there is provided a fourth harmonic laser whose optical resonator consists of first and second reflective surfaces, preferably highly reflective mirrors. An efficient intracavity fourth harmonic generation laser with increased conversion efficiency and improved mode quality is provided. Laser medium - preferably a solid state laser medium is located within the optical cavity to generate a beam of fundamental electromagnetic radiation (EMR) having a preselected wavelength transmitted from the front and back ends of the laser medium. A second harmonic LBO crystal (critically phase-matched or non-critically phase-matched cut) inside the optical resonator is used to convert a portion of the fundamental beam into a second harmonic beam. A type II third harmonic LBO nonlinear crystal (critical phase-matched cut) is also located inside ...

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Abstract

The invention relates to a device for generating a fourth harmonic light beam. The system comprises an active laser medium in an optical cavity, and a second harmonic generator for generating a secondharmonic frequency of fundamental frequency light directly generated by the laser medium. The fundamental wave light beam is guided to the second harmonic generation crystal, wherein one part of fundamental wave light beams are converted into second harmonic light beams; before the second harmonic light beam is converted into the higher harmonic light beam, the second harmonic wave and the unconverted fundamental wave light beam are reflected back to the second harmonic wave generator by a reflecting surface and pass through the second harmonic wave generator again; an independent reflectingsurface can also be used for reflecting an unconverted fundamental wave light beam and a second harmonic light beam respectively; and the unconverted second harmonic light beam can be guided into a laser medium to serve as an additional pump, and almost all ultraviolet light beams with the wavelength exceeding 99% or even more can be output from a laser cavity. The laser of the invention has significantly improved conversion efficiency and improved mode quality.

Description

technical field [0001] The invention relates to the technical field of lasers, in particular to a fourth harmonic light beam device and a method for generating the same. Background technique [0002] Generating optical harmonics using a nonlinear medium such as a nonlinear crystal provides a means of accessing the double, third or fourth harmonic of the frequency of electromagnetic radiation emitted by a laser or other high-intensity source. Already in such as LiNbO 3 , KDT, KTP, BBO, LBO and other crystals have realized harmonic generation and optical parametric oscillation. And blue light, green light and ultraviolet laser are widely used in fields such as industry, medical treatment and scientific research. [0003] UV lasers can be used for drilling, micro welding and other applications. The fourth harmonic generation method of intracavity has been proposed, see the literature "Intracavity Fourth Harmonic Generation Using ThreePieces of LBO in a Nd:YAG Laser" by Tso Y...

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Application Information

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IPC IPC(8): H01S3/109H01S3/081
CPCH01S3/0813H01S3/109
Inventor 尹雨松王世波巫国潮罗兴龙黄学武李晓坚靳光阳曾平平
Owner 富通尼激光科技(东莞)有限公司
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