Domain wall-based nonlinear impulse autocorrelation measuring method and measuring device

A non-linear, autocorrelation technology, applied in the direction of instruments, etc., can solve the problems of large autocorrelation curve width, large pulse width, crystal matching angle, low conversion efficiency of phase matching bandwidth, etc., to achieve easy alignment and autocorrelation The effect of strong signal and improved nonlinear conversion efficiency

Active Publication Date: 2014-04-02
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

As mentioned above, the birefringence phase matching mechanism has many defects in the measurement process of femtosecond pulses with a wide spectrum, and there are often problems of crystal matching angle, phase matching bandwidth and low conversion efficiency.
Especially in the measurement of femtosecond pulses, if the phase matching bandwidth is smaller than the spectral width of the femtosecond pulse itself, the width of the obtained autocorrelation curve will be too large, and the estimated pulse width will also be too large

Method used

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  • Domain wall-based nonlinear impulse autocorrelation measuring method and measuring device
  • Domain wall-based nonlinear impulse autocorrelation measuring method and measuring device
  • Domain wall-based nonlinear impulse autocorrelation measuring method and measuring device

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Embodiment 1

[0032] Such as figure 1As shown, in this embodiment, the light beam to be measured is divided into two beams, one of which is delayed and the two beams are focused on the domain wall of the periodically polarized nonlinear ferroelectric crystal, thereby generating a corresponding Cerenkov radiation multiplier Frequency, the time-domain overlapping part of the two-way Cherenkov radiation frequency multiplication generates sum-frequency light, that is, an autocorrelation signal, adjusts the delay of one beam of light, and measures the difference between the change of the autocorrelation signal and the change of the delay The relationship of the autocorrelation curve is obtained, so as to obtain the pulse time domain width of the beam to be measured.

[0033] Periodically polarized nonlinear ferroelectric crystals are obtained by the following method: select a Z-cut magnesium-doped lithium niobate wafer with a thickness of 1 mm and a 5% mol doping ratio, and the Z direction is th...

Embodiment 2

[0043] Such as image 3 As shown, this embodiment includes: an entrance diaphragm 1, a beam splitter 2, a first right-angle prism 3, a focusing mirror 4, a second right-angle prism 5, a mobile platform 6, a periodically polarized nonlinear ferroelectric crystal 7, a recording Detector 11 and control system 12, wherein: the light to be measured is incident by the incident diaphragm 1, and is divided into two beams of light by the beam splitter 2, and the two beams of light respectively pass through the first rectangular prisms 3 arranged on both sides of the beam splitter 2 Refraction with the second right-angle prism 5 forms a parallel light beam incident on the focusing mirror 4, the second right-angle prism 5 is arranged on the mobile platform 6 to adjust the time delay of one beam of light, and the focusing mirror 4 focuses the two beams of light On the domain wall of the periodically polarized nonlinear ferroelectric crystal 7 , an autocorrelation signal is generated. The ...

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Abstract

The invention discloses a domain wall-based nonlinear impulse autocorrelation measuring method and a measuring device in the field of optical impulse characteristic measurement. The method comprises the following steps of dividing a light beam to be measured into two beams, delaying one of the two beams, focusing the two beams of light on a domain wall of a periodically polarized nonlinear ferroelectric crystal to generate corresponding Cerenkov radiation frequency multiplication, ensuring that time domain overlapped sections of the two paths of Cerenkov radiation frequency multiplication generate autocorrelation signals, adjusting the delay of one of the light beams, and measuring a relation between the change of the autocorrelation signals and the change of the delay to obtain an autocorrelation curve so as to obtain the impulse time domain width of the light beam to be measured. By the method and the device, the nonlinear conversion efficiency is improved and the stronger autocorrelation signals are generated.

Description

technical field [0001] The invention relates to a method and device in the field of measuring optical pulse characteristics, in particular to a pulse autocorrelation measurement method and a measurement device based on domain wall nonlinearity. Background technique [0002] Ultrashort lasers, that is, pulsed light on the order of femtoseconds to several picoseconds, have been widely used in optics, physics, biology, chemistry and other disciplines, in the study of light-matter interaction, nonlinear imaging, femtosecond chemistry, Femtosecond metrology, laser micromachining and other fields have important applications. Ultrashort laser pulse temporal width is an important parameter in pulsed laser characterization, and the measurement of ultrashort laser pulse is the most basic and routine procedure. [0003] There are many measurement techniques for ultrashort laser pulses, from the most basic optical autocorrelation method to Optical frequency resolved optical gating, FRO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J11/00
Inventor 邓学伟郑远林任怀瑾李俊陈险峰
Owner SHANGHAI JIAO TONG UNIV
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