Ultrashort pulse detector based on lateral frequency doubling by using microcrystalline glass as frequency doubling medium

Abstract

The invention discloses an ultrashort pulse detector based on lateral frequency doubling by using microcrystalline glass as a frequency doubling medium, and the detector comprises a beam splitting module, a beam steering module, a signal generating module and a signal collecting and processing module, wherein the beam splitting module comprises a half -wave plate and a beam splitting component; the beam steering module comprises four mirrors and two half-wave plates; and the signal generating module is highly transparent microcrystalline glass with a frequency doubling effect. The pulse to betested is split by using the light wave beam splitting component, every two of the four mirrors in the beam steering module are placed symmetrically with the angular bisector of the pulse angle afterthe beam splitting as the axis of symmetry to ensure that the two pulses after the beam splitting have equal optical path difference and collinear and opposite propagation directions after passing through the mirrors at both sides, the polarization directions of the pulses are adjusted to be consistent and then incident into the lateral frequency doubling medium, and the pulse wide measurement ofthe ultrashort pulse is realized by analyzing the lateral frequency doubling signal. Compared with the traditional detection method, the detection takes less time and the detection accuracy is high.

Description

technical field [0001] The invention belongs to the field of laser pulse detection, and in particular relates to an ultrashort pulse detector based on transverse frequency doubling in which glass-ceramic is a frequency doubling medium. Background technique [0002] Ultrashort pulse laser has the characteristics of short duration and high peak power. With the development and further improvement of high-performance lasers, ultrashort pulse lasers have been widely used in high-speed optical communications, optical sensing, optical frequency combs, lidar, spectral analysis, military and other fields. Pulse width is one of the important parameters of ultrashort pulse laser. Effective detection of ultrashort pulse laser pulse width is an important prerequisite for utilizing ultrashort pulse laser. However, traditional photodetectors cannot detect ultrashort pulse width parameters at the femtosecond level. [0003] At present, the commonly used instruments for detecting ultrasho...

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Problems solved by technology

But only when the frequency-doubling medium satisfies the phase matching in the vertical direction of the light wave vector incidence, the horizontal frequency-doubling signal can be transmitted efficiently, otherwise the transmission efficiency of the horizontal frequency-doubling signal is extremely low

However, common frequency-doubling crystals are difficult to meet this phase matching requirement.

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