Frequency-doubling method capable of preventing frequency-doubling recede transition and laser

A frequency-doubling laser and frequency-doubling light technology are applied in the field of lasers to achieve the effects of improving frequency-doubling conversion efficiency, preventing frequency-doubling deconversion, and improving frequency-doubling conversion efficiency.

Inactive Publication Date: 2009-07-01
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires the use of two separate doubling materials and is only suitable for Type II phase-matched doubling processes

Method used

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  • Frequency-doubling method capable of preventing frequency-doubling recede transition and laser
  • Frequency-doubling method capable of preventing frequency-doubling recede transition and laser

Examples

Experimental program
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Embodiment 1

[0020] Such as figure 1 As shown, this embodiment adopts the type I phase-matched internal cavity frequency doubling. LM is Nd:YAG laser material, NLC is LBO frequency doubling material cut according to type I phase matching angle, WP is 1 / 4 wave plate of 532nm frequency doubling light, cavity mirrors M1 and M2 are highly reflective to 1064nm fundamental frequency light, The dichroic mirror M3 is highly reflective to 1064nm fundamental frequency light and highly transparent to 532nm frequency doubled light, the dichroic mirror M4 is highly transparent to 1064nm and highly reflective to 532nm, and the mirror M5 is highly reflective to 532nm.

[0021] The laser generated by Nd:YAG is in the "P" polarization state. After frequency doubling by LBO, a 532nm laser in the "S" polarization state is generated. After the frequency doubled light is reflected by the dichroic mirror M4, it passes through the 1 / 4 wave plate WP back and forth. The polarization direction is rotated by 90 deg...

Embodiment 2

[0023] This embodiment adopts the type II phase-matching internal cavity frequency doubling. LM is Nd:YV04 laser material, NLC is KTP frequency doubling material cut according to type II phase matching angle, WP is 1 / 4 wave plate of 532nm frequency doubling light, cavity mirrors M1 and M2 are highly reflective to 1064nm fundamental frequency light, The dichroic mirror M3 is highly reflective to 1064nm fundamental frequency light and highly transparent to 532nm frequency doubled light, the dichroic mirror M4 is highly transparent to 1064nm and highly reflective to 532nm, and the mirror M5 is highly reflective to 532nm.

[0024] The polarization direction of the laser generated by Nd:YV04 is at an angle of 45 degrees to the paper surface. After frequency doubling by KTP, a 532nm laser with "S" polarization is generated. The frequency doubling light is reflected by the dichroic mirror M4 and passes through 1 / 4 wave back and forth. For sheet WP, the polarization direction is rotat...

Embodiment 3

[0025] Embodiment 3: as figure 2 As shown, this embodiment adopts type I phase-matching external cavity frequency doubling. FL is the fundamental frequency light, P is the optical isolator, NLC is the LBO frequency doubling material cut according to the type I phase matching angle, WP is the 1 / 4 wave plate of the 532nm frequency doubling light, dichroic mirrors M1 and M2 are for 1064nm High transmission of fundamental frequency light, high reflection of 532nm frequency doubled light, mirror M3 high reflection of 1064nm fundamental frequency light, and reflector M4 high reflection of 532nm frequency doubled light.

[0026] The FL fundamental frequency light passing through the optical isolator P is in the "P" polarization state, and after being frequency-doubled by LBO, a 532nm laser in the "S" polarization state is generated. After the frequency-doubled light is reflected by the dichroic mirror M2, it passes through 1 / 4 back and forth With the wave plate WP, the polarization...

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Abstract

The invention relates to a frequency doubling method capable of obviating reverse conversion and a laser. The method comprises the following steps: (1) doubling the frequency of a fundamental beam generated by a laser source through a frequency doubling material, and splitting the frequency-doubled beam into two beams by a dichroic mirror; (2) changing the polarization direction of one frequency-doubled beam generated by a first single pass through a 1 / 4 wave plate of a frequency-doubled beam and a reflector, and returning to the frequency doubling material; (3) reflecting the residual fundamental beam in the first single pass to the frequency doubling material to carry out second frequency doubling; and (4) splitting a double-pass frequency-doubled beam from the frequency doubling material and the residual fundamental beam in the second single pass into two beams by a dichroic mirror, outputting the double-pass frequency-doubled beam, and returning the residual fundamental beam in the second single pass. By rotating the polarization direction of the frequency-doubled beam of the first single pass by 90 DEG, the method can prevent reverse conversion of the frequency-doubled beam to the fundamental beam, thereby improving the laser frequency doubling conversion efficiency. The method can be widely used in various kinds of intracavity and extracavity solid-state lasers.

Description

technical field [0001] The invention relates to a laser, in particular to a frequency doubling method capable of preventing frequency doubling deconversion and a laser. Background technique [0002] When designing a solid-state laser that uses the nonlinear effect of nonlinear materials to obtain frequency-doubled laser output, it is generally desirable to obtain high-power laser output. All-solid-state frequency-doubling lasers are divided into two categories: external cavity and internal cavity. The former is generally low in conversion efficiency due to the low power density of the fundamental wave outside the cavity; the latter directly uses the higher fundamental power density in the cavity. Therefore, nonlinear transformation can be performed efficiently. The fundamental frequency light in the cavity type generally adopts a two-way way to pass through the nonlinear material to generate frequency doubled light back and forth. The original intention of this method is t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/109
Inventor 巩马理闫平柳强黄雪黄磊张海涛李晨
Owner TSINGHUA UNIV
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