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21 October 1994 Controllable multiple-ring fringes in central brightness
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With several different glasses for nonlinear optical materials we first observed the far field multiple-ring fringes in them using a cw Ar+ laser as a light source at 514.5 nm and 488.0 nm, respectively. The central brightness of multiple-ring fringes could be controlled through changing incident power or the sample position near the focus. This phenomenon is considered as a result of spatial self-phase modulation caused from self-focusing. The thresholds of fringes and the thresholds of laser damage in three kinds of glasses are different from one another. Moreover, the far-field fringes of reflecting light were watched carefully. The light power limiter of optical density D equals log 1/T(lambda ) equals (infinity) can be constructed with the phenomenon.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Zhi-Zhong Zha, Yundong Zhang, Geng-Fu Zhou, Qi L. Wang, and Zuguang Ma "Controllable multiple-ring fringes in central brightness", Proc. SPIE 2287, Properties and Characteristics of Optical Glass III, (21 October 1994);

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