Measurement method of chirp characteristics of linear chirp pulses

Abstract

The invention discloses a measurement method of chirp characteristics of linear chirp pulses, and belongs to the linear optics measuring technologies. The measurement progress includes the steps that femtosecond laser pulses are divided into two beams by a light splitting sheet, one beam serves as reference pulses, and the other beam is stretched by a pulse stretcher to serve as to-be-measured chirp pulses; the two beams enter a spectrograph successively in a coaxial transmission mode to form frequency spectrum interference fringes; chirp pulse spectrums and the frequency spectrum interference fringes of different kinds of delay time are collected, and then chirp characteristic parameters of the chirp pulses are obtained through simple data processing. The method needs neither nonlinear material nor high-strength laser condition, can measure the linear chirp pulses of picosecond even subpicosecond levels, and is high in measurement accuracy.

Description

technical field [0001] The invention relates to a frequency-domain interferometry technique, in particular to a method for measuring the chirp characteristics of a linear chirp pulse. Background technique [0002] In pump-probe techniques for single-shot, ultrafast measurements, linearly chirped pulses are widely used as probe light. This is because the use of chirped detection light can linearly encode ultrafast information in the time domain into the pulse spectrum, and then perform dispersion recording through a dispersive device such as a spectrometer, thereby avoiding the use of ultrafast response detectors. The method of resolution measurement realizes ultrafast time-resolved measurement. At present, linearly chirped pulses have been widely used in the fields of THz detection, laser-driven shock waves, and laser-induced plasma generation. Generally speaking, linear chirped pulses can be generated by propagating femtosecond laser pulses through optical dispersive elem...

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Problems solved by technology

However, streak cameras are limited by picosecond time resolution and are expensive, so they cannot be used for short pulse measurements; for other nonlinear optical methods, nonlinear optical materials with strong nonlinear effects and fast response time and high-intensity laser Pulse is essential (Control of the gated spectrum with narrow bandwidth from a supercontinuum using ultrafast optical Kerr gate of bismuth glass, Appl. Phys. Lett., W.J.Tan, H.Liu, J.H.Si, and X.Hou)

Therefore, the application of these technologies has been greatly limited

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