Mr. Xiaojun Chen Profile

Xiaojun Chen

postgraduate at Soochow Univ

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Proceedings Article | 29 August 2009 Paper

Development of a nonlinear optical measurement-4f coherent imaging system

Xiaojun Chen, Yinglin Song, Jihua Gu, Junyi Yang, Min Shui, Dengke Hou, Zongjie Zhu

Proceedings Volume 7382, 73820N (2009) https://doi.org/10.1117/12.836600

KEYWORDS: Imaging systems, Complex systems, Coherence imaging, Refraction, Absorption, Optical testing, Nonlinear optics, Refractive index, Fourier transforms, Phase contrast

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After the nonlinear optical phenomena were discovered, people began to research the techniques to detect the optical nonlinearities of materials. In this paper, a new optical nonlinear measurement technique-4f coherent imaging system is recommended. The system has many advantages: single shot real-time measurement, simple experimental apparatus, high sensitivity, being able to detect the magnitude and sign of both nonlinear absorption and refraction at the same time, low requirement of beam spatial distribution, and so on. This paper introduces the theory of the 4f system and makes a detailed review and expounds development and application of the 4f coherent image system. The nerve of the experiment is improving the phase diaphragm. The shape of the diaphragm from the double-slits to the small rectangular object, and transition to a circular aperture, finally forming a circular phase diaphragm, which is a circular aperture in the center add a phase object. Following these diaphragm changes, the sensitivity of the system is greatly improved. The latest developments of the system are series-wound double 4f coherent imaging technique and the time-resolved pump-probe system based on NIT-PO. The time-resolved pump-probe system based on NIT-PO can be used to measure the dynamic characteristics of excited states nonlinear absorption and refraction.

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