Analysis of self-focusing beams of concentric symmetry in As[sub 2]S[sub 3] glass using a near-field scanning optical microscope

Lee, Jaekwang; Park, Soon-Bin; Cho, Kyuman; Song, Ki-Bong
April 2003
Applied Physics Letters;4/14/2003, Vol. 82 Issue 15, p2416
Academic Journal
The self-focusing (SF) effect for concentric laser beams passing through As[sub 2]S[sub 3] glass was studied using a near-field scanning optical microscope. In the case of radially symmetric laser beams at the wavelength 633 nm, there was no special bright spot caused by the SF effect at local areas, except for the central part of the light beam. The minimum beam size that was arrested by nonparaxiality was less than 0.3 µm, which is approximately equal to the wavelength of light in the As[sub 2]S[sub 3] glass, 0.265 µm. Qualitatively, the experimental results agreed with the theoretical prediction of the nonparaxial approximation.


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