Optical fiber looptime lens system for generating STUD pulse

Abstract

The invention provides an optical fiber looptime lens system for generating STUD pulse. The optical fiber looptime lens system takes a single-mode continuous laser device as a light source and is characterized by further comprising a first photoelectric switch, an arbitrary wave generator, a second photoelectric switch, a ytterbium-dopedoptical fiber amplifier, a band-pass filter, a third photoelectric switch, a phase modulator and a grating pair. The system is simple in structure, is capable of directly generating high-repetition-frequencygaussian pulse with short pulse width via a photoelectric switch and broadening a spectrum of optical pulse passing through an optical fiber loop, and is also capable of compressing the laser pulse with the broadened spectrum via the optical grating and generating ultra-short laser pulse super-gaussian pulse (STUD pulse) with a steep rising edge or a falling edge; the width of the spectrum, the width of the pulse and the rising edge of the pulse arearbitrarily adjustable; the STUD pulse can be used for inhibiting parametric instability in process of driving inertial confinementnuclear fusion via the laser. The optical fiber looptime lens system has the characteristics of novel technology and simple structure (full optical fiber).

Description

technical field [0001] The invention relates to ultrashort laser pulses, in particular to a fiber ring time lens system for generating STUD pulses. The system can efficiently output adjustable, high repetition frequency STUD pulses and ultrashort pulse lasers. Background technique [0002] At present, parametric instability (stimulated Raman scattering, stimulated Brillouin scattering, filamentation, etc.) is one of the main reasons that ultimately limit laser-driven inertial confinement fusion. In order to suppress parametric instability, scientists from various countries have successively proposed a series of beam smoothing methods such as spectral dispersion smoothing, polarization smoothing, and continuous phase plate. Through the spatial energy distribution of the uniform beam, they allow the focal spot of the beam to move rapidly on the target surface, effectively avoiding the filamentation of the bright spot and suppressing the instability of the parameters. However,...

AI Technical Summary

Problems solved by technology

Regardless of Q-switching or mode-locking technology, it is difficult to obtain ideal STUD pulses

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