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A Cascade Optical Frequency Converter Based on Monolithic Phosphate Crystal and Its Application

A phosphate crystal and frequency converter technology, which is applied in the field of laser and nonlinear optics, can solve the problems of inconvenient use and low efficiency, and achieve the effects of improved conversion efficiency, low raw material cost and large size

Active Publication Date: 2019-05-10
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this device and method, if the working wavelength of the fundamental frequency is changed, Gd needs to be changed accordingly x Y 1-x The crystal composition of COB is x, which means that the crystal needs to be re-grown, which is inconvenient and inefficient to use

Method used

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  • A Cascade Optical Frequency Converter Based on Monolithic Phosphate Crystal and Its Application
  • A Cascade Optical Frequency Converter Based on Monolithic Phosphate Crystal and Its Application
  • A Cascade Optical Frequency Converter Based on Monolithic Phosphate Crystal and Its Application

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Effect test

Embodiment 1

[0057] Such as Figure 1-3 shown.

[0058] A cascaded optical frequency converter of 1064nm nanosecond laser based on a single phosphate crystal, including a first beam splitter, a phosphate crystal, a polarization conversion module, a second beam splitter and a third beam splitter arranged along the direction of the optical path mirror. The phosphate crystal is a KDP crystal; the polarization conversion module includes a first reflection mirror, a quarter-wave plate and a second reflection mirror arranged along the direction of the optical path. The second mirror is coated with a dielectric film with high reflection to 532nm laser. Phosphate crystals are cut along the direction of Class II frequency doubling phase matching; the direction of Class II frequency doubling phase matching is θ=58.9°, φ=0°; the angle of Class II triple frequency phase matching is θ=58.4°, φ=0 °; The transparent surface of the phosphate crystal is coated with a dielectric film for anti-reflection ...

Embodiment 2

[0061] The cascaded optical frequency converter based on a single phosphate crystal as described in Example 1 is different in that the phosphate crystal is an ADP crystal; the phase-matching direction of the class II frequency multiplication is θ=61.6°, φ=0° ; Class II triple frequency phase matching angle is θ=60.0°, φ=0°.

[0062] ADP crystals are grown by an aqueous solution method, and large-size single crystals with high optical quality can be obtained by traditional cooling methods or rapid cooling methods. The raw material is cheap, the growth cost is low, and the crystal growth process, orientation, cutting, polishing, coating and other processes are relatively mature.

Embodiment 3

[0064] The cascaded optical converter based on a monolithic phosphate crystal as described in Example 1 is different in that the angle between the direction of the optical axis of the quarter-wave plate and the bisector of the angles of the o-light and e-light angles of the phosphate crystal is 0°. The frequency-doubled light passes through the quarter-wave plate twice, which is equivalent to passing through a half-wave plate. The linear polarization direction is rotated by 90°, and the polarization state of the relative frequency conversion crystal is changed from e light to o light, which meets the type II sum frequency phase matching condition . The quarter-wave plate is a 532nm quarter-wave plate made of quartz, and the transparent surface is coated with a dielectric film for anti-reflection of 532nm laser. The first mirror is coated with a dielectric film with high reflection to 1064nm laser and high transparency to 532nm laser.

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Abstract

The invention relates to a cascaded optical frequency converter based on a monolithic phosphate crystal and application of the cascaded optical frequency converter. The optical frequency converter comprises a first beam splitter, a phosphate crystal, a polarization conversion module, a second beam splitter and a third beam splitter which are arranged in the direction of an optical path. The cascaded optical frequency converter takes the phosphate crystal as a nonlinear optical medium, changes the polarization state of frequency doubled light through a quarter-wave plate, performs cascaded frequency converting between frequency doubling and frequency tripling through a turn-back light path, and realizes the direct output from near-infrared laser to ultraviolet laser in one crystal; the phosphate crystal has the advantages of low material cost, high easiness in growth, large size and good quality; as within a 1 micrometer wave band, the phase matching directions of class II frequency doubling and class II frequency tripling of the phosphate crystal are basically the same, the light conversion efficiency is high.

Description

technical field [0001] The invention relates to a cascaded optical frequency converter based on a single phosphate crystal and its application, and belongs to the technical field of laser and nonlinear optics. Background technique [0002] At present, ultraviolet lasers are widely used in precision machining, optical engraving, rapid prototyping, optical storage and medical treatment. There are many ways to obtain ultraviolet laser, including: frequency conversion of infrared laser by nonlinear optical crystal, frequency conversion of infrared laser by two-dimensional photonic crystal, and anti-Stokes Raman scattering. Among them, the use of nonlinear optical crystals for frequency conversion is the most commonly used. This method has the advantages of high efficiency, good beam quality, and high stability. At present, the relatively mature technical method of using nonlinear optical crystals for frequency conversion to obtain ultraviolet lasers is to triple the frequency o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/355G02F1/35G02F1/37
CPCG02F1/353G02F1/3551G02F1/37G02F1/354
Inventor 王正平亓宏伟孙洵许心光吴志心任宏凯孙玉祥
Owner SHANDONG UNIV
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