Collinear opticalparametricamplification method and device

Abstract

The invention discloses a collinear optical parametricamplification method and a collinear optical parametricamplification device, and belongs to the technical field of ultrafast laser. A BaF2 crystal is inserted between two beta-BaB2O4 crystals, generated femtosecond pump light and broadband signal light are synchronously and collinearly transmitted into the first beta-BaB2O4 crystal for first optical parametricamplification, the amplified femtosecond signal light and femtosecond idle frequency light are generated, and at the moment, the femtosecond pump light exceeds the femtosecond signal light, and the femtosecond signal light exceeds the femtosecond idle frequency light; after the light passes the BaF2 crystal, the femtosecond idle frequency light exceeds the femtosecond signal light, and the femtosecond signal light exceeds the femtosecond pump light; and the light passes the second beta-BaB2O4 crystal for second optical parametricamplification, and the femtosecond pump light, the femtosecond signal light and the femtosecond idle frequency light achieve time synchronization. By the method and the device, group velocity mismatch among the pump light, the signal light and theidle frequency light is compensated simultaneously, the time synchronization of three optical signals is improved, and the gain spectrum width and the conversion efficiency of a collinear optical parametricamplifier are improved.

Description

technical field [0001] The invention relates to the field of ultrafast laser technology, in particular to a collinear optical parametric amplification method and device. Background technique [0002] Ultrashort high-energy laser pulses have broad application prospects in fields such as strong-field laser physics. For a long time, due to the limitations of existing ultrafast laser media (such as Ti:sapphire), the generation of ultrashort high-energy laser pulses has been mainly concentrated in the visible-near-infrared (near 0.8 μm) band. To further develop the application of ultra-short high-energy laser pulses, such as: in-depth research on tunneling ionization or deep tunneling ionization, generation of coherent X-rays in the water window band, and research on ultrafast electron dynamics, etc., it is necessary to place the center of the laser pulse The wavelength extends to the mid-infrared (1μm-5μm) direction. These important applications not only require the central wa...

AI Technical Summary

Problems solved by technology

Although this scheme can generate a signal light pulse output with a pulse width less than 10 fs in the 1.1 μm-2.1 μm band, the generated idler light has angular dispersion, which limits the further application of the idler light

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