I am Arunbabu, Researcher from Indian Institute of Science, Bangalore. i am working on the waveguides and trying to fabricate some photonic devices out of it.
Publications (3)
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The present study discusses the photosensitivity of GeS2 chalcogenide glass in response to irradiation with femtosecond pulses at 1047 nm. Bulk GeS2 glasses are prepared by conventional melt quenching technique and the amorphous nature of the glass is confirmed using X-ray diffraction. Ultrafast laser inscription technique is used to fabricate the straight channel waveguides in the glass. Single scan and multi scan waveguides are inscribed in GeS2 glasses of length 0.65 cm using a master oscillator power amplifier Yb doped fiber laser (IMRA μjewel D400) with different pulse energy and translation speed. Diameters of the inscribed waveguides are measured and its dependence on the inscription parameters such as translation speed and pulse energy is studied. Butt coupling method is used to characterize the loss measurement of the inscribed optical waveguides. The mode field image of the waveguides is captured using CCD camera and compared with the mode field image of a standard SMF-28 fibers.
In this work, we synthesized bulk amorphous GeGaS glass by conventional melt quenching technique. Amorphous nature of
the glass is confirmed using X-ray diffraction. We fabricated the channel waveguides on this glass using the ultrafast laser
inscription technique. The waveguides are written on this glass 100 μm below the surface of the glass with a separation of 50
μm by focusing the laser beam into the material using 0.67 NA lens. The laser parameters are set to 350 fs pulse duration at
100 KHz repetition rate. A range of writing energies with translation speeds 1 mm/s, 2 mm/s, 3 mm/s and 4 mm/s were
investigated. After fabrication the waveguides facets were ground and polished to the optical quality to remove any tapering
of the waveguide close to the edges. We characterized the loss measurement by butt coupling method and the mode field
image of the waveguides has been captured to compare with the mode field image of fibers. Also we compared the
asymmetry in the shape of the waveguide and its photo structural change using Raman spectra.
We report here, a finite difference thermal diffusion (FDTD) model for controlling the cross-section and the guiding nature of the buried channel waveguides fabricated on GeGaS bulk glasses using the direct laser writing technique. Optimization of the laser parameters for guiding at wavelength 1550 nm is done experimentally and compared with the theoretical values estimated by FDTD model. The mode field diameter (MFD) between 5.294 μm and 24.706 μm were attained by suitable selection of writing speed (1mm/s to 4 mm/s) and pulse energy (623 nJ to 806 nJ) of the laser at a fixed repletion rate of 100 kHz. Transition from single-mode to multi-mode waveguide is observed at pulse energy 806nJ as a consequence of heat accumulation. The thermal diffusion model fits well for single-mode waveguides with the exception of multi-mode waveguides.
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