Device for measuring width of single picosecond laser pulse

Abstract

The invention discloses a device for measuring the width of a single picosecond laser pulse. The device consists of a beam splitter, a delay adjustor, a first reflector, a second reflector, a reflection grating, a KDP frequency doubling crystal, a filter, a CCD array and an oscilloscope, which have the following position relationships that: the beam splitter is arranged in the input direction of the laser pulse to be measured; the laser pulse beam to be measured is split into a transmission beam and a reflection beam through the beam splitter; the transmission beam enters the KDP frequency doubling crystal through the delay adjustor and the first reflector; the reflection beam also enters the KDP frequency doubling crystal after passing through the second reflector and the reflection grating; and the two beams generate non-collinear related signals in the KDP frequency doubling crystal, and the related signals enter the CCD array through the filter and are finally displayed on the oscilloscope. The width of the measured pulse can be acquired through calculation. The device for measuring the width of the single picosecond laser pulse not only effectively improves the sensitivity of the measurement, but also enlarges the wavelength range of the measurable pulse.

Description

Technical field [0001] The invention relates to a high-power ultra-short laser pulse, which is a single ultra-short laser pulse width measuring device. It uses a beam splitter to divide a laser beam to be measured into a reflected beam and a transmitted beam, and a reflection grating introduces the pulse in a beam of light The wavefront is tilted (lateral time delay) and interacts with another beam of light non-collinearly in the frequency doubling crystal to generate a related signal, thereby achieving a single measurement of the picosecond laser pulse width. Background technique [0002] In recent years, with the emergence of new crystals and new lasers, many achievements have been made in the research of optical parametric oscillators (OPO) and optical parametric amplifiers (OPA), and with the development of chirped pulse amplification (CPA), high-energy The generation of ultrashort laser pulses has made a great breakthrough. Since the amplification of ultrashort pulse lasers...

AI Technical Summary

Problems solved by technology

Although this device can realize a single measurement of the laser pulse width in the wavelength range of picoseconds to hundreds of picoseconds, the loss of the beam when it is grazing incident through the grating is very high. In addition, it is necessary to use a dove prism to invert the beam. The optical path difference is compensated by a quartz compensation block, which makes the device more complicated and virtually increases the difficulty of optical path adjustment

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