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Once signal to noise ratio measuring method and device based on chirp pulse feature

A technology of measuring device and measuring method, applied in the direction of instruments, etc., can solve the problem of low repetition frequency

Active Publication Date: 2013-04-24
杭州奥创光子技术有限公司
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Problems solved by technology

However, when the pulse is amplified to the level of Joules and the intensity reaches the level of Pawatts, the repetition rate is low, and it is usually a single pulse. For such a single-operation ultra-powerful laser device, a single measurement

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  • Once signal to noise ratio measuring method and device based on chirp pulse feature
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  • Once signal to noise ratio measuring method and device based on chirp pulse feature

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Embodiment Construction

[0040] The principle of the present invention is to use the optical Kerr gate effect to construct the pump detection optical path. The measuring device broadens the detection light into laser pulses chirped in time and space through a grating or a prism; and the pump light is the laser pulse to be measured. compressed ultrashort pulses, usually picosecond or femtosecond pulses, such as figure 1 As shown, during the measurement process, the half-width region of the chirped pulse can be selected as the measurement window (see figure 1 area within the dashed box). When the pump light forms an optical Kerr gate in the nonlinear medium, it forms a temporal gating signal for the probe light, that is, the third-order nonlinearity of the nonlinear medium produces a polarization rotation for the time-synchronous part of the probe light. Finally, through the analyzer, the transmitted signal is collected by the scientific grade CCD to obtain the Kerr signal light intensity I OKS distri...

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Abstract

The invention provides a once signal to noise ratio measuring method and a device based on a chirp pulse feature. The once signal to noise ratio measuring method and the device based on the chirp pulse feature can measure a signal to noise ratio of a once pulse. The principles include that a pumping probe light path is built by optical Kerr effect. The measuring device broadens probe light as chirp laser pulse in time and space by a grating or a prism. The probe light transmits from an analyzer due to the optical Kerr effect, a transmitted signal is collected by a scientific-level charge-coupled device (CCD), and signal to noise ratio of the laser pulse to be detected is obtained. The method introduces large negative dispersion amount by the grating or the prism, broadens probe light pulse to hundreds of picoseconds or more, and enables time window to reach hundreds of picoseconds or more. Meanwhile, a spatial light modulator is inserted in the probe light path so as to finally increase dynamic scopes.

Description

technical field [0001] The invention is a method and device for measuring single signal-to-noise ratio based on chirped pulse characteristics. Background technique [0002] The interaction between ultra-short and ultra-intense laser pulses and matter is a strong field process. The pulse signal-to-noise ratio is a very important parameter that directly affects the interaction between laser and matter. The signal-to-noise ratio of ultra-short and ultra-intense laser pulses can be accurately measured. Ratio is crucial for strong-field physics. [0003] For the measurement of picosecond and femtosecond pulse signal-to-noise ratios, general-purpose electronic measurement techniques such as streak cameras cannot meet the needs, and the most commonly used measurement methods are techniques such as third-order autocorrelation. The triple correlation method uses a frequency multiplication and a sum frequency process to obtain a triple frequency signal, which can accurately measure n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J11/00
Inventor 王向林王屹山赵卫张伟杨直胡晓鸿
Owner 杭州奥创光子技术有限公司
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