Device and method for mode selection and power amplification of broadband femtosecond laser

Abstract

The invention relates to a device and a method for mode selection and power amplification of a broadband femtosecond laser. The device comprises a first laser isolator sequentially located on an incident light path of the broadband femtosecond laser, and is characterized in that a first total reflection mirror is sequentially arranged after the first laser isolator, and a second total reflection mirror and an F-P cavity are sequentially arranged along an emergent direction of the first total reflection mirror; an emergent light path of the F-P cavity is sequentially provided with a third total reflection mirror, a fourth total reflection mirror, a half-wave plate and a polarization beam splitter, and a reflection light path of the polarization beam splitter is provided with a photoelectric detector; a transmission light path of the polarization beam splitter is sequentially provided with a first optical grating, a diaphragm, a fifth total reflection mirror, a sixth total reflection mirror, a laser diode and a second optical grating; and a reflection light path of the second optical grating is sequentially provided with a seventh total reflection mirror, a second isolator, a first laser shaping prism and a second shaping prism. According to the whole device and the method provided by the invention, excellent Gaussian type small-amount or single-mode high-power pulse laser with very small spot size can be outputted.

Description

technical field [0001] The invention relates to mode selection and amplification technology, in particular to a device and method for mode selection and power amplification of broadband femtosecond laser. Background technique [0002] The emergence of broadband mode-locked pulsed lasers has brought revolutionary progress to the fields of optical frequency synthesis, ultrafast optics, and strong optical field nonlinearity, and has rapidly promoted the mutual integration of these fields. Broadband mode-locked pulsed lasers are widely used in industrial and medical fields such as the monitoring of gas pollutants, the detection of human health, and the research of biological macromolecules. The extremely wide spectral bandwidth range enables the broadband laser to cover almost all atmospheric pollution components, so that the atmospheric pollution components can be detected quickly and conveniently through the spectrum. The ultrafast pulse process makes it possible to study the...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problems such as the inability to select a single mode in the mode selection and amplification technology of the existing broadband femtosecond pulsed laser, the mode width cannot be changed, and the mode power amplification is affected by multi-modes, the present invention provides a method that can be changed. Method and device for mode-locking femtosecond laser pulse mode width and selecting a small number and single mode and effectively amplifying its power

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