Ultrafast laser pulse width measuring device and control method thereof

Abstract

The invention discloses an ultrafast laser pulse width measuring device and a control method thereof. The device comprises a beam splitting part, a first adjustable part, a rotating part and a secondadjustable part, the first adjustable part comprises a time delay assembly and an adjuster, the time delay assembly is connected with the adjuster, the second adjustable part comprises a measuring assembly and a controller, and the measuring assembly is connected with the controller; a to-be-measured light beam is divided into a first light beam and a second light beam by a beam splitting part; the reliability of pulse width measurement is ensured; based on the first adjustable part, the accurate adjustment of the optical path of the first light beam can be quickly realized. Based on the rotating part and the second adjustable part, beam pulse detection of any angle polarization state and measurement of autocorrelation signals of the beam pulse detection are achieved, so that the pulse width of a to-be-detected beam is output accurately with high precision, the device is low in structure cost and easy and convenient to operate, operation of professionals is not needed, and the detectable work efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of laser applications, in particular to an ultrafast laser pulse width measuring device and a control method thereof. Background technique [0002] Since the laser was invented in the 20th century, it has been hailed as "the fastest knife", "brightest light" and "the most accurate ruler" for its outstanding characteristics; Another great invention. The generation of laser light requires at least the following three elements: a working substance that realizes particle population inversion, an excitation source that excites atoms, and an optical resonant cavity that realizes light amplification. With the continuous development of laser technology, laser is widely used in communication, industry, military and medical fields due to its good monochromaticity, strong coherence, good directionality and high energy concentration. Among them, the quality of laser spot is the main reason affecting the application of...

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Problems solved by technology

However, solution (1) not only requires high optical path adjustment, but also requires precise adjustment of the grating pair spacing, and requires a standard autocorrelator to calibrate the pulse width during use, which is cumbersome to operate; in addition, the use of gratings will cause greater insertion loss and lead to laser The quality of the spot is reduced; although the solution (2) is easy to operate, it is difficult to maintain accurate horizontal or vertical linear polarization of the transmitted light pulse in the fiber, resulting in double pulses or complex chirp after the femtosecond laser passes through the fiber jumper. Chirp characteristics, resulting in unstable autocorrelation test results

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