Abstract

We fabricated the Fresnel zone plate by embedding voids in silica glass. We investigated the focusing properties by launching a He-Ne laser beam into the zone plate. The spot size of the primary focal point was 7.0 μm and agreed with the theoretical value of 6.1 μm. The diffraction efficiency was 2.0 %. This technique enables us to make alignment free micro-scale lenses inside bulk materials.

© 2002 Optical Society of America

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Appl. Opt. (1)

Appl. Phys. Lett. (1)

K. Miura, J. Qiu, H. Inouye, T. Mitsuyu, and K. Hirao, �??Photowritten optical waveguides in various glasses with ultrashort pulse laser,�?? Appl. Phys. Lett. 71, 3329-3331 (1997).

Electron. Lett. (1)

Y. Sikorski, A. A. Said, P. Bado, M. Maynard, C. Florea, and K. A. Winick, �??Optical waveguide amplifier in Nd-doped glass written with near-IR femtosecond laser pulses,�?? Electron. Lett. 36, 226-227 (2000).
[CrossRef]

Opt. Commun. (2)

S. H. Cho, H. Kumagai, K. Midorikawa, and M. Obara, �??Fabrication of double cladding structure in optical multimode fibers using plasma channeling excited by a high-intensity femtosecond laser laser,�?? Opt. Commun. 168, 287-295 (1999).
[CrossRef]

L. Sudrie, M. Franco, B. Prade, A. Mysyrowicz, �??Writing of permanent birefringent microlayers in bulk fused silica with femtosecond laser pulses,�?? Opt. Commun. 171, 279-284 (1999).
[CrossRef]

Opt. Express (2)

Opt. Lett. (6)

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