Double-synchronous pumping Raman laser amplification device and method

Abstract

The invention discloses a double-synchronous pumping Raman laser amplification device and method. The double-synchronous pumping Raman laser amplification device comprises a picosecond multi-pulse laser, a Raman synchronous pumping cavity A, a traveling wave amplifier and a Raman synchronous pumping cavity B. After picosecond pulses output by the picosecond multi-pulse laser are split by a first beam splitter, reflected light enters the traveling wave amplifier to be amplified, and amplified fundamental frequency light is obtained; the transmission light enters the Raman synchronous pumping cavity A to be subjected to stimulated Raman scattering, and Stokes seed light is obtained; and amplified fundamental frequency light and Stokes seed light enter the Raman synchronous pumping cavity B for Raman synchronous amplification after being combined by a second beam splitter, and high-order Stokes light after Raman synchronous amplification is output. The picosecond multi-pulse technology, the Raman synchronous pumping technology and the Raman amplification technology are combined, the picosecond Raman gain can be effectively improved, and high-energy picosecond high-order Stokes light output is obtained.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a double synchronously pumped Raman laser amplification device and method. Background technique [0002] The spectrum in the picosecond infrared band has very important applications in the fields of laser ranging, laser remote sensing, national defense and security, and stimulated Raman scattering is one of the effective ways to obtain the infrared band. With the common 1064nm as the fundamental frequency light and high-quality Raman medium, the commonly used 1.3μm, 1.5μm, and even 2μm infrared spectra can be obtained. [0003] For picosecond stimulated Raman scattering, the ultra-short interaction time between light and the medium and the large quantum bandwidth between the fundamental frequency light in the infrared band and the Stokes light will lead to lower Raman gain, thus limiting the picosecond Stokes Light develops to a higher order. Therefore, it is of great research s...

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Problems solved by technology

[0004] Existing picosecond infrared Raman schemes mainly focus on picosecond laser pulses with a repetition frequency of MHz. The single pulse energy is weak, resulting in low Raman gain, which is not conducive to the excitation of high-order Stokes light, and the Raman synchronous pump cavity The cavity length is too long, the reliability is poor

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