Method of diagnosing chirp characteristic and space-time distribution characteristic of ultrashort pulse laser at the same time

Abstract

The invention discloses a method of diagnosing chirp characteristic and space-time distribution characteristic of ultrashort pulse laser at the same time, and belongs to the technical field of ultrashort laser. The method of diagnosing chirp characteristic and space-time distribution characteristic of ultrashort pulse laser at the same time directly uses a signal light to be detected and a reference light to perform spectral domain and spatial domain interference coaxially, and can obtain the space-time distribution characteristic and the residual chirp characteristic of ultrashort pulse laser according to the shape characteristic of an interference pattern and the transverse and vertical distribution rules of the interference fringes. The method of diagnosing chirp characteristic and space-time distribution characteristic of ultrashort pulse laser at the same time is a unique short pulse diagnosis technology of providing the space-time distribution information and the time domain characteristic information at the same time. Compared with an autocorrelation instrument for time domain diagnosis or an FROG method, the method of diagnosing chirp characteristic and space-time distribution characteristic of ultrashort pulse laser at the same time utilizes a linear interference measurement technology and uses an ideal reference light source, thus being able to work in an ultralow energy condition and having higher testing accuracy.

Description

technical field [0001] The invention belongs to the technical field of ultra-short and ultra-intensive lasers, and in particular relates to a method capable of simultaneously diagnosing the chirp characteristics and time-space distribution characteristics of ultra-short pulse lasers. Background technique [0002] At present, ultra-intense and ultra-short pulse laser has become an important tool for the research of strong field physics and high energy density physics. Researchers can obtain extremely high electric field and power density by focusing short pulse laser. However, due to the existence of large-aperture lenses (used for spatial filtering and image transmission) in ultra-short and ultra-intense laser systems, the short pulses output by the system have spatio-temporal distortions, resulting in the time-domain width of the focused pulse being much larger than that of the non-focused state The lower time-domain width makes the actual focusing electric field and power ...

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Problems solved by technology

[0003] However, in the existing mature testing technology, only time-domain characteristics can be measured separately, such as streak camera, autocorrelator or SPIDER, FROG and other instruments can be used to measure pulse width (chirp characteristics); for time- Spatial distribution characteristics, there is no mature diagnostic technology. W.Amir et al. proposed in the journal Optics Letters in 2006 that the space-spectral interference fringes obtained under a certain time delay condition can be obtained indirectly through the Fourier transform method. The spatio-temporal distribution of

[0004] So far, there is no technology that can simultaneously measure chirp characteristics and spatiotemporal distribution characteristics

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