Towards femtosecond laser written arrayed waveguide gratings.

The fabrication of arrayed waveguide gratings (AWGs) using the femtosecond laser direct-write technique is investigated. We successfully demonstrate the fabrication of large planar waveguides that act as 2D free propagation zones. These slabs were found to have a highly uniform refractive index with a standard deviation of 1.97% relative to the total index contrast. The incorporation of low loss linear adiabatic tapers resulted in an increase of transmission by 90%. Strategies for manufacturing integrated laser written AWGs using continuous contouring to avoid lossy defects are discussed and demonstrated.

[1]  K. Winick,et al.  Fabrication and characterization of photonic devices directly written in glass using femtosecond laser pulses , 2003 .

[2]  Crosstalk reduction of arrayed waveguide gratings by UV trimming of individual waveguides without H/sub 2/-loading , 2000, Optical Fiber Communication Conference. Technical Digest Postconference Edition. Trends in Optics and Photonics Vol.37 (IEEE Cat. No. 00CH37079).

[3]  I. Mansour,et al.  An improved procedure to calculate the refractive index profile from the measured near-field intensity , 1996 .

[4]  A. Driessen,et al.  Raman spectroscopy with an integrated arrayed-waveguide grating. , 2011, Optics letters.

[5]  Yasuyuki Inoue,et al.  Silica-based Arrayed-waveguide Gratings for the Visible Wavelength Range , 2007 .

[6]  M. Pollnau,et al.  Toward Spectral-Domain Optical Coherence Tomography on a Chip , 2012, IEEE Journal of Selected Topics in Quantum Electronics.

[7]  N. Jovanovic,et al.  First starlight spectrum captured using an integrated photonic micro-spectrograph , 2012, 1208.4418.

[8]  J. G. Robertson,et al.  Starlight demonstration of the Dragonfly instrument: an integrated photonic pupil-remapping interferometer for high-contrast imaging , 2012, 1210.0603.

[9]  A. Tünnermann,et al.  Geometric potential and transport in photonic topological crystals. , 2010, Physical review letters.

[10]  Stephen Ho,et al.  Transition from thermal diffusion to heat accumulation in high repetition rate femtosecond laser writing of buried optical waveguides. , 2008, Optics express.

[11]  Jörg Hübner,et al.  UV trimming of arrayed-waveguide grating wavelength division demultiplexers , 1998 .

[12]  S. Nolte,et al.  Femtosecond waveguide writing: a new avenue to three-dimensional integrated optics , 2003 .

[13]  Kazuyoshi Itoh,et al.  Fabrication of multimode interference waveguides in glass by use of a femtosecond laser. , 2005, Optics letters.

[14]  Nemanja Jovanovic,et al.  Low bend loss waveguides enable compact, efficient 3D photonic chips. , 2013, Optics express.

[15]  Nick Cvetojevic,et al.  Developing arrayed waveguide grating spectrographs for multi-object astronomical spectroscopy. , 2012, Optics express.

[16]  Nemanja Jovanovic,et al.  Multiband processing of multimode light: combining 3D photonic lanterns with waveguide Bragg gratings , 2013, 1311.0549.

[17]  E. Mazur,et al.  Bulk heating of transparent materials using a high-repetition-rate femtosecond laser , 2003 .

[18]  K. Nugent,et al.  Quantitative optical phase microscopy. , 1998, Optics letters.

[19]  T A Birks,et al.  Ultrafast laser inscription of an integrated photonic lantern. , 2011, Optics express.

[20]  Nemanja Jovanovic,et al.  Integrated photonic building blocks for next-generation astronomical instrumentation II: the multimode to single mode transition. , 2013, Optics express.

[21]  A. Gil de Paz,et al.  MEGARA optical manufacturing process , 2014, Astronomical Telescopes and Instrumentation.

[22]  Yuki Komai,et al.  Application of Arrayed-Waveguide Grating to Compact Spectroscopic Sensors , 2004 .

[23]  Reduction in dispersion of silica-based AWG using photosensitive phase trimming technique , 2002 .

[24]  K. Miura,et al.  Ion exchange in glass using femtosecond laser irradiation , 2008 .

[25]  Michael J. Ireland,et al.  RHEA: the ultra-compact replicable high-resolution exoplanet and Asteroseismology spectrograph , 2014, Astronomical Telescopes and Instrumentation.

[26]  Uwe Morgner,et al.  Er:Yb-doped waveguide laser fabricated by femtosecond laser pulses. , 2004, Optics letters.

[27]  Mk Meint Smit,et al.  PHASAR-based WDM-devices: Principles, design and applications , 1996 .

[28]  A. Kar,et al.  Ultrafast laser inscribed waveguide lattice in glass for direct observation of transverse localization of light , 2012 .

[29]  K. Okamoto,et al.  Very low insertion loss arrayed-waveguide grating with vertically tapered waveguides , 2000, IEEE Photonics Technology Letters.

[30]  Satoshi Kawata,et al.  Laser nanofabrication in photoresists and azopolymers , 2014 .

[31]  H. Takahashi,et al.  Integrated optical tweezers using arrayed waveguide grating , 2005, (CLEO). Conference on Lasers and Electro-Optics, 2005..