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Micro-Raman mapping of micro-gratings in BACCARAT glass directly written using femtosecond laser (Comunicazione a convegno)

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Micro-Raman mapping of micro-gratings in BACCARAT glass directly written using femtosecond laser (Comunicazione a convegno) (literal)

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K.C. Vishnubhatla, S. Venugopal Rao, R. Sai Santosh Kumar, S.N.B. Bhaktha, A. Chiappini, A. Chiasera, J. Laureyns, M. Ferrari, M. Mattarelli, M. Montagna, R. Osellame, R. Ramponi, G.C. Righini, S. Turrell, and D. Narayana Rao (2008)
Micro-Raman mapping of micro-gratings in BACCARAT glass directly written using femtosecond laser
in SPIE Photonics West 2008, LASE 2008 Commercial and Biochemical Application of Ultrafast Lasers VIII, San Jose, California USA, 19-24 January 2008
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K.C. Vishnubhatla, S. Venugopal Rao, R. Sai Santosh Kumar, S.N.B. Bhaktha, A. Chiappini, A. Chiasera, J. Laureyns, M. Ferrari, M. Mattarelli, M. Montagna, R. Osellame, R. Ramponi, G.C. Righini, S. Turrell, and D. Narayana Rao (literal)

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School of Physics, University of Hyderabad, Hyderabad 500046, India; Advanced Centre of Research in High Energy Materials (ACRHEM), School of Physics, University of Hyderabad, Hyderabad 500046, India; Université des Sciences et Technologies de Lille, Laboratoire de Spectrochimie Infrarouge et Raman, Bât C5, 59655 - Villeneuve d'Ascq Cedex, France; Dipartimento di Fisica, CSMFO Group, Università di Trento, Via Sommarive 14, 38050 Trento, Italy; IFN-CNR, Istituto di Fotonica e Nanotecnologie, CSMFO Group, Via Sommarive 14, 38050 Trento, Italy; Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche, Istituto Nazionale per la Fisica della Materia, Politecnico, Piazza L. da Vinci, 32, I-20133 Milano, Italy; Department of Optoelectronics and Photonics, Nello Carrara Institute of Applied Physics, IFAC-CNR, Via Panciatichi 64, I-50127 Firenze, Italy (literal)

Titolo

Micro-Raman mapping of micro-gratings in BACCARAT glass directly written using femtosecond laser (literal)

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Abstract

We present some of our results on the femtosecond laser direct writing and characterization of micro-gratings in Baccarat glass. Gratings were inscribed with amplified 800 nm, ~100 femtosecond pulses at 1 kHz repetition rate. The change in refractive index of the modified region was estimated from grating efficiency measurements and was found to be ~10-3. Micro-Raman studies demonstrated an increase in the intensity of the band near 596 cm -1 in the laser irradiated region clearly indicating an increase in the refractive index. Micro-Raman mapping of the grating showed a periodic variation of the band intensity further confirming the formation of grating. Structures with sub wavelength dimensions (<800 nm) were achieved with shaping of the input pulses using a rectangular slit. Waveguides were inscribed by optimizing parameters like slit width, focusing conditions, translation speed etc. We shall present our results on the physical, spectroscopic and optical characterization of these structures. (literal)

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