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A Simple Femtosecond Pulse Width Measurement System

A femtosecond pulse and width measurement technology, which is applied in the field of femtosecond pulse width measurement system, can solve the problems of complexity, difficult operation and high hardware equipment requirements, and achieve the effect of overcoming defects

Inactive Publication Date: 2017-10-27
EAST CHINA NORMAL UNIV
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  • Abstract
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Problems solved by technology

However, the aforementioned pulse width measurement methods all need to use nonlinear crystals and perform phase matching to realize this process, which is relatively complicated and difficult to operate.
In addition, in recent years, there is no need to use nonlinear crystals, and the method of using photodetectors with nonlinear responses to measure the width of optical pulses is basically the same as the previous method, and nonlinear crystals are omitted, but this pulse width measurement method requires High-precision mechanical stepping motor to complete, high requirements for hardware equipment

Method used

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  • A Simple Femtosecond Pulse Width Measurement System

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Embodiment

[0021] refer to figure 1 , this embodiment includes mirror 101, focusing element 102, beam splitter 201, delay line (piezoelectric ceramics and mirror) 202, mirror 203, mirror 204, two-photon detector 205; high voltage generation module 301, data The acquisition and processing module 401 adopts a modular design, wherein the focusing element, the reflector 101 and the condenser reflector 102, are used to focus the measured femtosecond pulse; the femtosecond pulse splitting and delay subsystem provides time delay changes and dual The photon detection signal includes a beam splitter 201, a delay line 202, a reflector 203, a reflector 204, and a two-photon detector 205; wherein the delay line 202 is a pair of reflectors driven by piezoelectric ceramics, including piezoelectric ceramics and reflectors. There are two parts of the mirror, the reflector is opposite to one end of the piezoelectric ceramic, and the other end of the piezoelectric ceramic is fixed. The mirror pair can pr...

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Abstract

The invention discloses a simple femtosecond pulse width measurement system, which includes a focusing element, a femtosecond pulse splitting delay subsystem, a high voltage generation module and a data acquisition and processing system; when a femtosecond optical ultrashort pulse with unknown pulse width , after passing through the focusing element, it enters the femtosecond pulse splitting and delay subsystem. In this subsystem, the femtosecond optical ultrashort pulse is divided into two beams by the beam splitter. The optical path difference between the two beams is adjusted by the output of the high-voltage generating module. The signal is thus controlled by changing the expansion and contraction of the piezoelectric ceramic. The last two beams of light arrive at the same position on the two-photon detector through the reflector. By changing the high-voltage signal controlling the piezoelectric ceramic, that is, changing the delay time of the pulse, the timing change of the signal measured by the two-photon detector is obtained, and the width of the femtosecond optical ultrashort pulse is obtained through data processing. The invention adopts light-gathering elements, piezoelectric ceramics and two-photon detectors, and has the characteristics of simplicity, strong feasibility and compact structure.

Description

technical field [0001] The invention relates to the field of optical measurement technology, in particular to a simple measurement system for femtosecond pulse width, which is used to measure the pulse width of an ultrashort optical pulse whose optical pulse width reaches the femtosecond level. Background technique [0002] The current common methods for measuring laser pulses are self-referencing spectral phase coherent electric field reconstruction method, frequency-resolved optical switching method and autocorrelation method. The general idea is: divide the laser into two beams, add a mechanical stepping motor in the optical path of one of the beams, then converge the two beams on the nonlinear crystal, control the stepping motor and use phase matching to realize the laser pulse width Measurement. However, the aforementioned pulse width measurement methods all need to use nonlinear crystals and perform phase matching to realize this process, which is relatively complicat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J11/00
Inventor 楼柿涛陆一帆李巍姜建伟张晓磊金庆原
Owner EAST CHINA NORMAL UNIV
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