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Single-shot laser signal-to-noise ratio detection device

A detection device and a technology of signal-to-noise ratio, applied to lasers, laser components, phonon exciters, etc., can solve the problems of complex optical path debugging and low time resolution, and achieve simple optical path debugging, high time resolution, and improved The effect of resolution

Active Publication Date: 2015-09-02
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0007] In order to solve the technical problems of low time resolution and complex optical path debugging of the existing single-pulse laser signal-to-noise ratio detection device, the present invention provides an optical Kerr shutter space scanning sampling single-shot laser signal-to-noise ratio detection device

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Embodiment Construction

[0030] A single-shot laser signal-to-noise ratio detection device, including a 1 / 4 wave plate, a beam splitter, a beam expander, an optical Kerr medium, an optical direction adjustment device, a delay device, a first polarizer, a second polarizer, and a second polarizer Three polarizers, a detector, and a first beam reducer.

[0031] The 1 / 4 wave plate and the beam splitter are sequentially set on the output light path of the light source, the beam splitter divides the light source into shutter light and signal light, the beam expander is set on the light path of the signal light, and the optical Kerr medium is set on the shutter light Where the signal light intersects, the third polarizer is arranged on the optical path of the shutter light, the first polarizer is arranged on the optical path of the signal light, and the second polarizer is arranged on the optical path of the signal light passing through the optical Kerr medium, The third polarizer is placed for vertical pola...

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Abstract

The invention relates to a single laser signal-to-noise detection device. A single pulse delay unit on a light path of signal light is saved, a beam contractor is arranged on a light path of shutter light, the shutter light is transmitted from one side of the beam-expanded signal light to the other side, and only when the shutter light exists, the signal light can reach the detector through an optical Kerr shutter, and then the signal light is subjected to space scanning and sampling by the shutter light, with continuous time. The time resolution is mainly determined by the optical Kerr response and relaxation time of the material, the optical Kerr response and relaxation time of same material can be only several dozens of femtoseconds, and the time resolution is higher in comparison with the prior signal-to-noise detection device,.

Description

technical field [0001] The invention relates to a single laser signal-to-noise ratio detection technology. Background technique [0002] Signal-to-noise ratio is an important technical index of lasers, which has a great influence on the reliability of laser application research, so it is necessary to monitor its signal-to-noise ratio. At present, there are two main methods for measuring the signal-to-noise ratio of a single laser pulse: [0003] One method uses a high-speed oscilloscope plus a silicon photodiode for direct measurement, which can measure the signal-to-noise ratio of optical pulses from hundreds of picoseconds to several nanoseconds; the other method uses third-order correlation and optical parametric amplification for indirect measurement. The time resolution can reach femtosecond level. They have the following disadvantages: [0004] 1. The time resolution of the first measurement method is very low, sub-nanosecond, which cannot detect picosecond and femt...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/00G01J11/00
Inventor 贺俊芳王屹山程光华吴登科
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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