Detecting method and its device for double light beam-two angle super short pulse laser pumping

Abstract

The present invention relates to ultrashort pulse laser testing technology, and is especially pumping and detecting method and device of double beam and two angle ultrashort pulse laser. The pulse laser beam the ultrashort pulse laser emits is split into two beams in the beam splitter, includes one as the pumping laser beam and one as the detecting laser beam. The detecting laser beam is delayed in a delay line and split in a beam splitter into two beams incoming to the surface of the sample in different angle, two photo detectors receive the reflected signals independently, the signals are acquired with one phase-lock amplifier and one computer, and the data are processed in the computer to obtain the optical characteristic curve of the sample. The present invention can measure both dielectric constant and light beam polarizing value of material, and realize precise determination of physical parameters in the conversion process in the time resolution of femtosecond level.

Description

technical field [0001] The invention relates to an ultrashort pulse laser testing technology, in particular to a double-beam-two-angle ultrashort pulse laser pumping detection method and its device, which adopts an ultrashort pulse laser and uses pumping detection technology to quantitatively study the magnetic transition of material structure. The fast dynamic process belongs to the field of laser testing technology and material science, and can realize the test of the ultrafast transition process inside the crystal and thin film structure of various materials. Background technique [0002] Terahertz operating frequency microstructures are currently a research hotspot and difficulty in the field of micro-nano science. Quite a few scientists are working on the design and manufacture of various terahertz microstructures for micro-execution and micro-drivers, but there are very few successful reports. . [0003] The study of magnetic transition is an important branch of physi...

AI Technical Summary

Problems solved by technology

Although they can provide useful information on the magnetic transition of the short-range ordered structure of the crystal, they cannot be effectively tested for the magnetic transition of the long-range ordered structure and the magnetic transition processes such as melting and amorphization. The study of subharmonic and lattice parameters cannot directly study the kinetics of the magnetic transition process

At the same time, these methods are all ultra-fast test methods above the picosecond level, and the time resolution of the femtosecond-level ultrafast magnetic transition process is still far from enough, so it is impossible to directly study the dynamics of the magnetic transition process

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