Optical fiber cascade spectrum compression device and method based on wavefront shaping

Abstract

The invention discloses an optical fiber cascade spectrum compression device and method based on wavefront shaping. Ultra-short pulses output by a femtosecond pulse laser (1) enter the beam expander (4) through alinear polarizer (2) and a half-wave plate (3) in sequence. After passing through the beam expander (4), the ultrashort pulses enter the polarization beam splitter prism (5) and are transmitted and output to the spatial light modulator (6) through the polarization beam splitter prism (5), and the ultrashort pulses reflected and output by the spatial light modulator (6) are reflected bythe polarization beam splitter prism (5) and then are output to the optical fiber coupling mirror (7); and the output end of the optical fiber coupling mirror (7) is connected with the multimode optical fiber (8), the ultrashort pulse transmitted by the multimode optical fiber (8) is incident to the single-mode optical fiber (10), and the output ultrashort pulse is incident to the spectrum analyzer (11). Compared with the prior art, the optical fiber cascade spectrum compression device and method have the advantages that femtosecond pulse transmission loss can be reduced as much as possible while femtosecond pulse spectrum efficient compression is achieved, and the optical fiber cascade spectrum compression device and method are an effective femtosecond pulse spectrum compression technology.

Description

technical field [0001] The invention relates to the fields of optical coherence control, nonlinear fiber optics and spectrum compression, in particular to an optical fiber cascaded spectrum compression device and method based on wavefront shaping. Background technique [0002] Due to its high peak power, high pulse energy, ultra-short duration and other characteristics, femtosecond pulses have been widely used in nonlinear optics, chemical substance detection, biomedicine and other fields since their appearance. Coherent anti-Stokes Raman scattering (CARS) microscopy imaging technology based on femtosecond pulses is widely used due to its non-invasive, label-free, chemical selectivity, and time resolution. It is used to study the dynamic Raman vibrational properties of biomolecules and perform microscopic imaging based on the Raman resonance of biomolecules. However, femtosecond pulses have extremely poor spectral resolution when applied to CARS microscopic imaging technolo...

AI Technical Summary

Problems solved by technology

However, femtosecond pulses have extremely poor spectral resolution when femtosecond pulses are applied to CARS microscopic imaging technology due to their intrinsic broad spectral characteristics, which greatly weakens the chemoselective detection capability of CARS microscopic imaging systems.

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