Fabrication of small Bragg reflectors in glass with refractive index change induced by ultrashort laser pulses

Kazuyoshi Itoh; Tadamasa Toma; Kazuhiro Yamada

doi:10.1117/12.363928

20 September 1999 Fabrication of small Bragg reflectors in glass with refractive index change induced by ultrashort laser pulses

Kazuyoshi Itoh, Tadamasa Toma, Kazuhiro Yamada

Author Affiliations +

Proceedings Volume 3801, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications V; (1999) https://doi.org/10.1117/12.363928
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

We succeeded in fabricating small Bragg reflectors in glass and will present this experiment. We found that the photo- induced refractive index change caused by 1-mJ 130-fs laser pulses is elongated along the optical axis compared with the original intensity distribution near the focus of the fabrication beam. The length and radius of the index change were approximately 30 and 2 micrometers, respectively. We consider that the self-focusing due to the self-phase modulation resulted in this form. This structure is suited for the fabrication of small Bragg reflectors in glass. We fabricated 1 mm X 1 mm X 30 mm Bragg reflectors. By analyzing the diffraction efficiencies of higher order diffraction beams we estimated the refractive index distribution. The thickness and spacing of the periodic laminar structure were 1.5 and was 3.8 micrometers, respectively. The maximum index change was 0.0015. We note that we observed a quite large amount of scattering loss (approximately 15%) in the grating. We fabricated also a 1 mm X 1 mm X 60 mm grating by writing two layers of gratings and obtained a diffraction efficiency of 13%. Recent experimental results of photorefractive waveguides will also be reviewed.

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Kazuyoshi Itoh, Tadamasa Toma, and Kazuhiro Yamada "Fabrication of small Bragg reflectors in glass with refractive index change induced by ultrashort laser pulses", Proc. SPIE 3801, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications V, (20 September 1999); https://doi.org/10.1117/12.363928

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