Broadband double-oscillation parametric oscillator for reflecting injected pump light

Abstract

The invention discloses a broadband double-oscillation parametric oscillator for reflecting injected pump light, which belongs to the field of optical parametric oscillators and comprises a resonant cavity, a nonlinear crystal and a dielectric mirror. A first plane of the dielectric mirror is used for increasing reflection of the pump light and increasing transmission of the signal light, and a second plane is used for increasing transmission of the signal light; in a working state, the dielectric mirror is located at any position of the signal light in the propagation direction, except the focusing cavity, of the resonant cavity; the incident direction of the pump light is located on the first plane side of the dielectric mirror; the incident direction of the signal light is located on the second plane side of the dielectric mirror; the pump light coincides with the emergent direction of the signal light; the nonlinear crystal is positioned in the focusing cavity of the resonant cavity; the nonlinear crystal is used for amplifying signal optical parameters; and the dielectric mirror is used for reflecting the pump light, so that the emergent directions of the pump light and the signal light coincide. Dispersion introduced by a broadband high-reflection film does not exist in the cavity of the double-oscillation optical parametric oscillator, and therefore the problem that thesignal light broadband is limited due to dispersion of the high-reflection film is solved.

Description

technical field [0001] The invention belongs to the field of optical parametric oscillators, and more specifically relates to a broadband dual-oscillation parametric oscillator that reflects and injects pump light. Background technique [0002] Ultrashort pulses have the advantages of good spatial coherence, extremely high peak power and good time resolution, and are widely used in the frontiers of various disciplines. In the visible and near-infrared bands, mode-locked lasers are usually used to generate ultrashort pulses; in the mid-infrared band, difference frequency generators and optical parametric oscillators are generally used to generate ultrashort pulses. The optical parametric oscillator operating in the parallel state has a very wide phase-matching bandwidth, which is suitable for ultrashort pulse and broadband frequency comb generation. [0003] In 2011, Nick Leindecker et al. obtained a 91fs pulse output through a degenerate optical parametric oscillator, and i...

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Problems solved by technology

[0005] Aiming at the defects of the prior art, the purpose of the present invention is to provide a bandwidth dual-oscillation optical parametric oscillator that reflects and injects pump light, aiming at solving the problem of the transmission-type pump input coupling mirror in the existing dual-oscillation optical parametric oscillator. High reflection film has high dispersion, which leads to the problem of limited bandwidth of signal light

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