Femtosecond laser fabrication of birefringent directional couplers as polarization beam splitters in fused silica.

Opt Express 2011 Jun;19(13):11992-9

Institute for Optical Sciences, and the Department of Electrical and Computer Engineering, University of Toronto, 10 Kings College Road, Toronto, Ontario, M5S 3G4, Canada.

Integrated polarization beam splitters based on birefringent directional couplers are demonstrated. The devices are fabricated in bulk fused silica glass by femtosecond laser writing (300 fs, 150 nJ at 500 kHz, 522 nm). The birefringence was measured from the spectral splitting of the Bragg grating resonances associated with the vertically and horizontally polarized modes. Polarization splitting directional couplers were designed and demonstrated with 0.5 dB/cm propagation losses and -19 dB and -24 dB extinction ratios for the polarization splitting.

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http://dx.doi.org/10.1364/OE.19.011992DOI Listing
June 2011
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