Wide-spectrum low-coherence light source device with arbitrary time shaping capability

Abstract

The invention discloses a wide-spectrum low-coherence light source with any-time shaping capability. The wide-spectrum low-coherence light source comprises a pumping source, a to-be-shaped wide spectrum, an input collimator, a parametric crystal, a small hole and an output collimator, the pumping source is a light source system with any time shaping capability, and the output of the pumping source is incident to the parametric crystal; a to-be-shaped wide spectrum passes through the collimator and then serves as signal light to be incident to the parametric crystal, an optical parametric amplification process occurs under the action of the pump light, and any time shaping of the wide-spectrum low-coherence continuous light source is achieved through time waveform control of the pump light. In the optical parametric amplification process, the gain in the coupling process of the pump light and the signal light is related to the pump light intensity, so that the time waveform distribution of the signal light is determined by the light intensity distribution of the pump light by performing time waveform shaping on the pump light and acting with the unsaturated signal light, that is, the time waveform shaping is performed on the signal light; therefore, within the duration of the pump light, a wide-spectrum shaping pulse is output after the pump light passes through the output collimator.

Description

technical field [0001] The invention belongs to the field of high-power laser and optical communication, in particular to a wide-spectrum low-coherence light source device with arbitrary time shaping capability. Background technique [0002] The existing wide-spectrum low-coherence optical temporal shaping encounters the problem of high-frequency modulation in the time domain caused by missing spectral components or Fabry-Perot (FP) filtering effects. Since the main advantage of a broadband low-coherence light source is its low temporal coherence, it is necessary to consider the impact of the shaping process on the temporal coherence of the light source to ensure that the low-coherence characteristics of the light source will not be excessively reduced or even eliminated due to shaping, and at the same time ensure that the shape obtained The time domain waveform is smooth. [0003] The current mature arbitrary time shaping scheme is to use electro-optic modulators for shapi...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of high-frequency modulation in the time domain caused by the lack of spectral components or FP filter effects encountered in the existing wide-spectrum time shaping, and to provide a wide-spectrum low-coherence light source device with arbitrary time shaping capabilities. The device utilizes the flexibly shaped pump light and the broadband spectrum to be incident on the parametric crystal, and realizes arbitrary time shaping of the incident broadband spectrum to obtain the output broadband spectrum shaped at any time. The process of parametric amplification can avoid the absence of spectrum, and can obtain High contrast temporal shaping with good signal-to-noise ratio

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