Measuring system for high repetition rate ultra-short light pulse carrier envelope phase

Abstract

The invention provides a measuring system for high repetition rate ultra-short light pulse carrier envelope phase. The system adopts a light pulse coupling mirror and is coupled to an inlet of a spectral dispersion imaging device along two collinear ultra-short light pulses having time-delay T. The interference spectrum of the two collinear ultra-short light pulses is mapped into a space interference fringe pattern related to phase difference by the spectral dispersion imaging device, and the space interference fringe pattern is divided into two parts having the same strength through a beam splitter. Two space modulators whose modulation period is the same as that of the interference fringe and having a 1 / 4 period displacement difference are adopted to respectively modulate the two parts of fringe patterns, and the displacement difference between the two space is 1 / 4 period. Two identical photoelectric detection devices of the same are adopted to detect the strength of signals penetrating through the two space modulators. The invention is advantageous in that the ultra-short light pulse carrier envelope phase difference can be obtained through the polar angle of a two-dimensional parameter curve formed by two photoelectric detection devices. The invention is advantageous in that the continuous single-shot measuring and controlling of the megahertz high repetition rate light pulse carrier envelope can be realized, and the carrier envelope phase of the pulse can be observed in a visual and real-time manner.

Description

technical field [0001] The invention belongs to the technical field of ultrafast phenomena and precision measurement, and in particular relates to a measurement system for the envelope phase of an ultrashort optical pulse carrier with a high repetition rate. Background technique [0002] The emergence of femtosecond pulses has greatly facilitated the study of ultrafast phenomena. The study of the interaction between light and matter under extreme conditions, especially the study of deeper high-order nonlinear physical phenomena such as the generation of attosecond pulses, strongly depends on the optical field intensity of ultrashort and ultraintense pulses. The change of the ultrashort pulse light field intensity is closely related to the phase of the carrier envelope of the pulse, especially for periodic pulses, the intensity of the two adjacent light fields in the pulse envelope is very different, so the carrier envelope phase completely determines the envelope The size o...

AI Technical Summary

Problems solved by technology

Therefore, this technique is only suitable for small-period pulsed carrier-envelope phase measurements

At the same time, because ATI high-energy electron spectroscopy requires tens of microjoules of less-period pulses to be generated in a vacuum chamber filled with xenon, the requirements for pulse width and energy are high, and the structure is complex.

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