A double-chirped spectrum optical parametric amplifier and its amplification method

Abstract

The invention is applicable to the technical field of laser and provides a double chirped spectrum optical parametric amplifier and an amplification method. The double chirped spectrum optical parametric amplifier is characterized in that pump light and signal light in time synchronization are generated by a femtosecond laser component and independently pass through an input grating and an input collimating lens to make different spectral components of the signal light and the pump light linearly dispersively focused on respective focal points to realize spatial chirps opposite in frequency change rate signs in focal planes; then on the basis of sector-shaped periodic polar crystal, efficient full-spectrum optical parametric amplification of the signal light is completed through the pump light, and broadband-spectrum idler-frequency light is generated; finally, a spectroscope is adopted for separating out the broadband-spectrum idler-frequency light, Fourier transformation from a spectral domain to a time domain is completed through an output collimating lens and an output grating, and necessary dispersion compensation is performed to obtain long-wavelength ultra-short pulse laser. The optical parametric amplifier is simple in structure, and the long-wavelength ultra-short pulse laser can be obtained.

Description

technical field [0001] The invention belongs to the field of laser technology, in particular to a double-chirped spectrum optical parametric amplifier and an amplification method. Background technique [0002] Long-wavelength ultrashort laser pulses with finite optical periods have important applications in the fields of physics, chemistry, biology, optoelectronics, and laser spectroscopy. They are important tools for conducting microscopic-scale scientific research and revealing ultrafast physical and chemical processes. [0003] At present, the frequency down-conversion technology based on the second-order optical nonlinear effect is an effective means to generate long-wavelength ultrashort pulse laser. To obtain a high-power ultrashort pulse laser, two necessary conditions are usually required: a wide-bandwidth driving light source and subsequent multi-stage difference frequency, and optical parametric amplification. Among them, the bandwidth of the driving light source ...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a double-chirped spectrum optical parametric amplifier and an amplification method, aiming to provide an optical parametric amplifier capable of generating and amplifying long-wavelength ultrashort pulse lasers, so as to solve the problem that conventional femtosecond optical parametric amplifiers are limited by crystal threshold and Group velocity mismatch, and conventional optical parametric chirped pulse amplifiers are difficult to achieve single-stage broadband optical parametric amplification, so that long-wavelength ultrashort pulse lasers cannot be obtained

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