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Optical parametric oscillator with reflectivity-variable internal cavity

A technology of optical parametric oscillator and reflectivity, which is applied in the laser field, can solve the problems of large beam divergence angle, poor beam quality, and limit the practical application of optical parametric oscillator, and achieve the effect of improving beam quality and reducing beam divergence angle

Inactive Publication Date: 2003-10-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, a common optical parametric oscillator has a problem, that is, the quality of the beam output by the optical parametric oscillator is very poor, and the beam divergence angle is large
This problem has not been well solved, which greatly limits the practical application of optical parametric oscillators

Method used

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  • Optical parametric oscillator with reflectivity-variable internal cavity
  • Optical parametric oscillator with reflectivity-variable internal cavity
  • Optical parametric oscillator with reflectivity-variable internal cavity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] As shown in Figure 3(a), the geometric configuration of the intracavity optical parametric oscillator adopts an unstable cavity structure, and the nonlinear crystal 2 is KTP (KTiOPO 4 ), working in a non-critical phase matching mode; the laser crystal 5 uses Nd:YAG, and is excited by a xenon lamp 12 to generate a laser with a wavelength of 1.064 μm; 10 is a passive Q-switched crystal, and 11 is a polarizer. The left side of the output mirror 3 is coated with a 1.57 μm variable reflectance film system, and the right side is coated with a double-layer film with high transmittance for light with a wavelength of 1.57 μm. The variable reflectivity curve of the output mirror 3 adopts figure 2 The 2nd order Gaussian linetype in 6. The output wavelength of Example 1 is around 1.57 μm.

[0018] The structure of the variable reflectivity film system inside the output mirror 3 is shown in Figure 3(b), wherein 15 is a substrate made of K9 glass; 16 is a 1 / 4 wavelength film of zir...

Embodiment 2

[0024] Embodiment 2 The geometric configuration adopts a flat-flat cavity, as shown in Figure 4, the nonlinear crystal 2 is periodically poled lithium niobate; 11 is a polarizer, and the laser crystal 5 is Nd:YAG, and the excitation is provided by a diode laser array 22 , producing a 1.064μm continuous laser. The right side of the middle mirror 1 is coated with a 1.57 μm variable reflectance film system, and the double-layer film on the left side has a high transmittance for light with a wavelength of 1.064 μm. The variable reflectivity curve uses figure 2 The 6th order Gaussian curve in 8. The output wavelength of Example 2 is around 1.57 μm.

[0025] The structure of the variable reflectivity film system on the right side of the intermediate mirror 1 is shown in Figure 4(b), where 15 is a substrate made of K9 glass; 16 is a 1 / 4 wavelength film of zirconium dioxide with a thickness of about 0.20 μm; 17 It is a silicon dioxide 1 / 4 wavelength film with a thickness of about 0...

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Abstract

The invention relates to an optical parametric oscillator with reflectivity varying in inner cavity. It consists of pump reflector, laser crystal, middle reflector, non-linear crystal and output reflector. The reflectivity varying film series corresponding to output light wave and composed of at least three films are applied on the surface of a reflector chosen one of them from output or input reflector. The coated surface faces to the crystal. The thickness of at least one film is curvilinear and the thickness at highest point of the curvilinear is as d=1 / 4n. The films among film series are made of inorganic optical filming materials. The angle of divergence of beam is diminished effectively, the quality of the output laser beam is improved by using cavity mirror whose values of reflectivity is varied as a curve along the radial.

Description

Technical field: [0001] The invention relates to an optical parametric oscillator with variable reflectivity in the cavity, more specifically, it adopts a variable reflectivity mirror as the resonant cavity mirror of the cavity optical parametric oscillator, and the reflectivity value of the variable reflectivity mirror is along the The radial direction is curved. An intracavity optical parametric oscillator using the cavity mirror can obtain laser output with very high beam quality, and belongs to the field of laser technology. Background technique: [0002] Optical parametric oscillator is a kind of nonlinear optical device, which uses nonlinear crystal as working medium. The working medium is placed in the resonant cavity, and the parameter conversion process is generated under the action of the pump light, and the laser output with a wavelength different from that of the pump laser is formed through the oscillation of the resonant cavity. Figure 1(a) is the simplest ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/08H01S3/086
Inventor 巩马理阎平沈磊
Owner TSINGHUA UNIV