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

A glass-ceramic and ultra-short pulse technology, which can be used in instruments and other directions, can solve the problems of low transmission efficiency of lateral frequency doubling signals, and the difficulty of frequency doubling crystals to meet the requirements of phase matching, and achieve short detection time and high detection accuracy. Effect

Inactive Publication Date: 2019-10-11
SOUTH CHINA UNIV OF TECH
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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 efficie

Method used

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

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Embodiment 1

[0030] The test pulse used in this embodiment is a hyperbolic secant type elliptically polarized pulse with a pulse width of 980 nm and a pulse width of 160 fs±20 fs. The frequency doubling medium used is LiNbO 3 Crystalline transparent glass-ceramics with a refractive index of 1.80.

[0031] Such as figure 1 As shown, when the pulse passes through the beam-splitting module, adjust the half-wave plate in the beam-splitting module so that the pulse is divided into two beams with the same intensity and an included angle of 90° in the propagation direction. After the four-sided symmetrical mirrors in the beam steering module, and adjust the two half-wave plates in the module to adjust the polarization directions to be consistent, the propagation directions are collinear. Two pulses are simultaneously incident on a LiNbO-containing 3 In the crystal-phase transparent glass-ceramic, fine-tuning the position of the glass-ceramic makes the horizontal frequency doubling signal most ...

Embodiment 2

[0035] The test pulse used in this embodiment is a hyperbolic secant type elliptically polarized pulse with a pulse width of 980 nm and a pulse width of 160 fs±20 fs. The frequency doubling medium used contains Ba 2 TiSi 2 o 8 Crystalline transparent glass-ceramics.

[0036] Such as figure 1 As shown, when the pulse passes through the beam splitting module, adjust the half-wave plate in the beam splitting module to split the pulse into two pulses with the same intensity and vertical polarization direction. After the four-sided symmetrical mirrors in the beam steering module, and adjust the two half-wave plates in the module to adjust the polarization directions to be consistent, the propagation directions are collinear. Two beams of pulses are simultaneously incident on a Ba-containing 2 TiSi 2 o 8 In the crystal-phase transparent glass-ceramic, fine-tuning the position of the glass-ceramic makes the horizontal frequency doubling signal most prominent. And use the CCD ...

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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...

Claims

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Application Information

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IPC IPC(8): G01J11/00
CPCG01J11/00
Inventor 虞华康周时凤冯旭伦逸鹏
Owner SOUTH CHINA UNIV OF TECH
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