Interference displacement measurement assisted FROG (frequency-resolved optical gating) measurer

A technology of frequency resolution and optical switching, which is applied in the direction of measuring optics, measuring devices, scientific instruments, etc., can solve the problems of low precision, rising cost, inaccurate measurement results, etc., and achieve the effect of accurate measurement and signal correction
CN107101730AActive Publication Date: 2017-08-29TIANJIN UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
TIANJIN UNIV
Publication Date
2017-08-29

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Abstract

The invention discloses an interference displacement measurement assisted FROG (frequency-resolved optical gating) measurer, and the measurer comprises an FROG signal light path and a red light correction optical path, determines the displacement of a displacement element according to a red light interference signal, and corrects an FROG signal. The process of generating the red light interference signal is that the red light for correction arrives at a point B of a second semi-transparent semi-reflection mirror, and is divided into two beams, wherein one beam is reflected by a second total-reflection mirror and a first total-reflection mirror, and then arrives at a point A of a first semi-transparent semi-reflection mirror, and the other beam is reflected by a fourth total-reflection mirror and a third total-reflection mirror, and then arrives at a point C of the first semi-transparent semi-reflection mirror; the two beams respectively through the points A and C of the first semi-transparent semi-reflection mirror to come outwards in a parallel manner, and then enters a third lens in a parallel manner to generate a red interference signal. The measurer can be used for correcting the FROG signal, and precisely measures the deformation of the displacement element.
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Description

technical field

[0001] The invention relates to an ultrashort pulse measurement, in particular to a frequency resolution optical switch method measuring instrument assisted by interference displacement measurement. Background technique

[0002] The time-domain pulse width and phase information of ultrashort laser pulses are important parameters of ultrashort laser pulses. Due to the extremely narrow time-domain pulse width of the femtosecond laser, the response speed of electronic devices is completely insufficient. To measure the time-domain width and phase information of the pulse, it is necessary to rely on optical methods.

[0003] For the measurement of pulse phase information, frequency-resolved optical gating (FROG) is commonly used. In 1993, Trebino and others proposed the FROG method. The measured pulse is divided into two beams, one beam of light is converged on the nonlinear crystal after a time delay, and the other beam of light is scanned, and then the beam pas...

Claims

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