11 February 2011 Optical device fabrication using femtosecond laser processing with glass-hologram
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Using femtosecond laser processing with glass-hologram, fabrication of 1cm-long straight waveguide and X-coupler is reported in this paper. We design and fabricate 4-level glass-hologram which generates 1cm-long straight line intensity. We fabricate 1cm-long waveguides inside fused silica at one shot exposure with the glass-hologram. We investigate the waveguide performance of near field pattern and propagation loss at wavelength of 1550nm. The near field pattern is almost circular shape. The propagation loss at 1550nm is estimated to be < 1.0 dB/cm. As an example of an optical device consisting of straight waveguides, we fabricate X-coupler or 2x2 coupler using straight line waveguides, and observe the output power ratio depending on crossing angle.
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Jun'ichi Suzuki, Jun'ichi Suzuki, Yasunori Arima, Yasunori Arima, Shuhei Tanaka, Shuhei Tanaka, } "Optical device fabrication using femtosecond laser processing with glass-hologram", Proc. SPIE 7925, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XI, 79251D (11 February 2011); doi: 10.1117/12.876108; https://doi.org/10.1117/12.876108

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