Broadband pump chirp compensation optical parametric amplification method and device

Abstract

The invention discloses a broadband pump chirp compensation optical parametric amplification method and device. The titanium sapphire laser source produces an initial femtosecond laser that is split into two beams: a stronger beam is used as pump light, a broadband chirp pump light is obtained after the stronger beam passes through a pump light spectrum stretcher and then enters a nonlinear crystal through a delay line and a dichroic mirror; a weaker beam enters a supercontinuum white light generator as a seed light, resulting in broadband chirp seed light and then enters in the nonlinear crystal through the dichroic mirror and then is coupled with the broadband chirp pump light to perform optical parametric amplification. The invention uses broadband chirp pump light with broadened spectrum and comprises more frequency components; the instantaneous frequency correspondence relationship between the broadband chirp pump light and the broadband chirp seed light is precisely regulated sothat the frequency component of the seed light achieves phase matching over a large range, thereby increasing the gain bandwidth of the signal light and realizing the ultra-wideband signal light spectrum output.

Description

Technical field [0001] The invention belongs to the technical field of ultrafast lasers, and in particular relates to a broadband pumped chirp compensation optical parametric amplification method and device. Background technique [0002] Femtosecond laser pulses have important applications in the research of ultrafast optics and strong field physics because of their ultra-short time resolution and extremely high peak power. Therefore, how to generate high-energy ultrashort laser pulses has become one of the important research directions of major universities and research institutes at home and abroad. At present, commercial titanium sapphire (Ti: sapphire) femtosecond lasers can generate ultra-short, ultra-strong pulses at a center wavelength of 800 nanometers. However, in many basic theories and practical applications related to ultrafast lasers, it is also crucial to generate femtosecond laser pulses with different center wavelengths. It should be noted that, limited by the b...

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Problems solved by technology

In the existing optical parametric amplification system, one of the most commonly used pump light sources is a titanium sapphire femtosecond laser, whose pulse width is usually greater than 30 femtoseconds, and the corresponding bandwidth is not enough to support the output of period-level pulse width, so will significantly limit the gain bandwidth of the optical parametric amplification system

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