Device and method for measuring signal-to-noise ratio based on single pulse for generating pulse sequence

Abstract

The invention belongs to the technical field of optics, and relates to a measuring device and method, in particular to a device and method for measuring the signal-to-noise ratio based on a single pulse for generating a pulse sequence. The device comprises a beam splitter, a double-sided reflection mirror, a reflection mirror, a first sum-frequency crystal, a second sum-frequency crystal, a dichroscope, a lambda / 2 half-wave plate, a lens, a stepping motor and a detector CCD. The measured single pulse obtains the curve that the strength of the third harmonic pulse sequence changes along with retardation through the elements, and the signal-to-noise ratio of the measured single pulse is calculated through the curve. The method is simple in principle, the device is compact in structure, debugging is easy, and measurement precision is high.

Description

technical field [0001] The invention belongs to the field of optical technology, and relates to a measuring device and method, in particular to a signal-to-noise ratio measuring device and method based on a single pulse of a generated pulse sequence. Background technique [0002] Femtosecond laser pulses, as a short-pulse-width, high-intensity laser light source, are widely used in strong field physics, detection of microscopic properties of matter, large-capacity information storage, high-speed optical communication, etc. than have high requirements. When the peak power of the pre-pulse exceeds the ionization threshold of the medium, an ionization reaction will occur with the surface of the medium before the main pulse to form a plasma surface, thereby changing the properties of the medium, affecting the interaction between the main pulse and the medium, and even the interaction between the main pulse and the medium Doesn't work as expected at all. This is very important ...

AI Technical Summary

Problems solved by technology

However, the structure of this method is relatively complicated, and components such as optical attenuators, fiber couplers, fiber isolators, wavelength division multiplexers, and ytterbium-doped gain fibers need to be used, and it involves the dispersion problem in gain fibers, and generally only applicable In addition, it requires a lot of software processing to eliminate noise accumulation, so it cannot be practical and integrated in single pulse measurement

Other methods of directly measuring single pulses, such as some scanning optical shutter methods, also have the disadvantages of low temporal resolution and low dynamic range

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