High-sensitivity measuring method for representing saturated absorption material

Abstract

The invention discloses a high-sensitivity measuring method for representing a saturated absorption material. A laser beam emitted from a laser device passes through a concave lens and a first convex lens in turn and then is expanded into a high-quality linear polarization gauss beam in suitable size; the gauss beam enters into a radial polarized beam generating system, and then a radial polarization vector optical field is formed; the radial polarization vector optical field is focused through a fourth convex lens; a nonlinear saturated absorption sample is controlled to move along an optical axis direction by an electric displacement platform, so that the nonlinear saturated absorption effect is stimulated; and lastly, after the beam passes through a fifth convex lens, an energy detector is used for collecting the transmitting energy of the nonlinear saturated absorption sample on different positions. According to the method provided by the invention, the light path is simple and the manufacturing cost of the device is low. Compared with the method for adopting gauss beam for measuring the saturation light intensity of the nonlinear saturated absorption material at present, the method provided by the invention has the advantage that the measuring sensitivity is increased by about 30%, so that the saturation light intensity of the nonlinear saturated absorption material, especially, the two-dimension saturated absorption material, can be more sensitively and accurately acquired.

Description

technical field [0001] The invention relates to a high-sensitivity measurement method for characterizing saturable-absorbing materials, which is a high-sensitivity measurement nonlinear saturated-absorption technology based on polarization state regulation, and is used to characterize the nonlinear saturated light intensity of nonlinear optical saturable-absorbing materials, belonging to Nonlinear photonics application technology, new nonlinear optical materials and modern photonics. Background technique [0002] Two-dimensional materials that have emerged in recent years, such as graphene, graphene oxide, and tungsten disulfide, have huge nonlinear saturable absorption effects under visible wavelength laser excitation. Such materials with saturable absorption effect have very important applications in the field of ultrafast photonics, such as mode-locked lasers and Q-switched lasers. To judge whether a material can be used as a practical saturable absorption medium, the sa...

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Problems solved by technology

[0004] Purpose of the invention: In order to overcome the problem that the sensitivity of the prior art to characterize the saturable absorption effect is not high enough, the present invention provides a high-sensitivity measurement method for characterizing the saturable absorption material, which combines the radially polarized beam with the traditional Z-scan device, and has a simple structure On the premise of low cost and convenient operation, it can more sensitively and effectively characterize the nonlinear saturation effect of materials; compared with the traditional linearly polarized Gaussian beam Z-scan, the measurement sensitivity of the present invention is increased by more than 30%

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