Multipoint vertical surface emitting terahertz parametric oscillator and application thereof

A terahertz parametric, vertical emission technology, used in solid-state lasers and other directions

Active Publication Date: 2014-01-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The terahertz radiation beam obtained based on the single-point vertical surface emission coupling method has good beam quality, but only a single point output, and the terahertz radiation generated in other interaction regions is absorbed by the crystal

Method used

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  • Multipoint vertical surface emitting terahertz parametric oscillator and application thereof
  • Multipoint vertical surface emitting terahertz parametric oscillator and application thereof
  • Multipoint vertical surface emitting terahertz parametric oscillator and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Such as figure 2 , shown in 3, the terahertz parametric oscillator of a kind of surface vertical emission of a kind of multipoint, comprises laser pumping system and Stokes laser oscillator, described Stokes laser oscillator comprises rear cavity mirror, output mirror and nonlinear crystal, The laser beam generated by the laser pumping system passes through the nonlinear crystal in the resonator, and the Raman and infrared active vibration modes of the nonlinear crystal generate stimulated excitons scattering, resulting in a nonlinear parametric process: 0.6-3.0THz of terahertz waves. The terahertz parameter source described in the present invention is coupled and outputted vertically or nearly vertically at multiple points on the side of the nonlinear crystal.

[0038] The nonlinear crystal, the nonlinear crystal is MgO:LiNbO 3 or LiNbO 3 , the cutting direction of the nonlinear crystal θ=90°, φ is any angle, the θ is the angle between the pump laser and the nonlin...

Embodiment 2

[0053] Such as Figure 4 Shown, as the terahertz parametric oscillator of a kind of multipoint surface vertical emission described in embodiment 1, wherein Stokes laser oscillator is made of lens 9,11 and built-in nonlinear crystal 10MgO:LiNbO 3 Composition: Cavity mirrors 1, 11 and lens 7 form the pump laser resonator, and the placement in the pump laser resonator is the side pump module 12 of the laser diode LD, the acousto-optic Q-switch 3, the polarizer 4, and the laser gain Dielectric 5Nd:YAG laser crystal, half-wave plate 8 and Stokes laser oscillator together form a terahertz parametric oscillator. The working method of the terahertz parametric source based on the multi-point surface vertical emission of excited excitons is as follows: the pump light generated by the LD side pumping system is coupled into the laser gain medium 5, and the generated fundamental frequency light passes through the MgO:LiNbO3 Crystal 10, due to MgO:LiNbO 3 The A1 vibration mode of the crys...

Embodiment 3

[0061] Such as Figure 6 As shown, the terahertz parametric oscillator of a kind of multi-point surface vertical emission as described in embodiment 1, wherein Stokes laser oscillator is made of mirror 9,11 and nonlinear crystal 10MgO:LiNbO 3 Composition: Cavity mirrors 1, 11 and lens 7 form the pump laser resonator, and the placement in the pump laser resonator is the side pump module 12 of the laser diode LD, the acousto-optic Q-switch 3, the polarizer 4, and the laser gain Dielectric 5Nd:YAG laser crystal, half-wave plate 8 and Stokes laser oscillator together form a terahertz parametric oscillator. The pumping system of the terahertz parametric source includes a laser diode LD13, an optical fiber 14, a coupling lens group 15, a pumping laser resonator composed of lenses 1, 11 and 7, and a laser gain medium 5 sequentially placed in the pumping laser resonating cavity as doped It consists of a neodymium yttrium aluminum garnet (Nd:YAG) laser crystal, a Q switch 3 , a polari...

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Abstract

The invention relates to a multipoint vertical surface emitting terahertz parametric oscillator, which comprises a laser pumping system and a Stokes laser oscillator, the Stokes laser oscillator comprises a back cavity mirror, an output mirror and a nonlinear crystal, a laser beam generated by the laser pumping system passes through the nonlinear crystal in a resonant cavity, and because of the Raman and infrared active vibrational mode of the nonlinear crystal, stimulated exciton scattering is caused and a nonlinear parametric process is generated: obtaining a terahertz wave of 0.6THz to 3.0THz. By using a new crystal design, the multipoint vertical surface emitting terahertz parametric oscillator disclosed by the invention can simultaneously obtain N equal to 2, 3, 4, ellipsis, n plus 1 (n is a natural number) beams of terahertz wave outputs under the same pumping condition; for example, when N is equal to 5, compared with the total energy of only one beam of terahertz wave output, the total energy of terahertz output is increased by 3.6 times.

Description

technical field [0001] The invention relates to a multi-point surface vertical emission terahertz parametric oscillator and its application, belonging to the technical field of oscillators. Background technique [0002] Stimulated exciton scattering is an important technique for generating terahertz radiation. Visible, near-infrared, and terahertz bands of continuously tunable lasers can be obtained through exciton scattering of certain crystals. Compared with terahertz sources of other technologies, such as optical rectification, quantum cascade lasers, and electrical terahertz sources, this terahertz parametric source based on stimulated exciton scattering has the advantages of package integration, room temperature operation, convenient use, Easy to tune, narrow line width and other advantages. Terahertz parametric sources have always been one of the research hotspots in the field of terahertz generation. There have been a lot of reports on terahertz parametric sources a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S1/02
Inventor 张行愚王伟涛王青圃丛振华刘兆军陈晓寒
Owner SHANDONG UNIV
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