A long-life two-color double-pulse femtosecond laser generating device and method

Abstract

The present invention relates to a long-life two-color double-pulse femtosecond laser generating device and method. The method includes: (1) converting part of the energy of the first-wavelength femtosecond laser pulse generated by a nonlinear crystal KDP femtosecond laser into a second wavelength Femtosecond laser pulse; (2), separate transmission of the femtosecond laser pulse of the first wavelength and the femtosecond laser pulse of the second wavelength; (3), adjust the direction and length of the first optical path and the second optical path, so that the first wavelength femtosecond laser pulse The second laser pulse and the second wavelength femtosecond laser pulse are finally fully synchronized, and merged into one way to obtain a two-color double pulse femtosecond laser; (4), adjust the relative length of the first optical path and the second optical path, so that the first wavelength femtosecond laser pulse A certain relative time delay is formed between the second-wavelength femtosecond laser pulse and the filament length of the two-color double-pulse femtosecond laser. The present invention can greatly prolong the length of femtosecond laser filamentation through the combination of two-color and double-pulse femtosecond laser pulses, which is simple and effective.

Description

technical field [0001] The invention relates to a long-life two-color double-pulse femtosecond laser generating device and method, which has great application significance for femtosecond laser remote atmospheric composition monitoring, laser-guided lightning strikes, etc., and belongs to the field of strong-field laser physics technology. Background technique [0002] The emergence of femtosecond lasers has promoted the development of various disciplines such as chemistry, physics, and biology, and many important research results related to femtosecond laser technology have gradually emerged. Then, for a long time, people believed that due to the influence of diffraction, group velocity dispersion and other reasons, femtosecond laser pulses cannot be transmitted in the atmosphere for long distances. However, with the deepening of the femtosecond laser experiment, researchers found that when the femtosecond laser is transmitted in the atmosphere, due to the existence of nonl...

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Problems solved by technology

[0004] The above-mentioned fiber extension methods are all based on the regulation of monochromatic single pulse. When the laser pulse energy cannot be increased, the fiber cannot be further enhanced.

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