Microstructured waveguides in z-cut LiNbO 3 by high-repetition rate direct femtosecond laser inscription

We report on the operational parameters that are required to fabricate buried, microstructured waveguides in a z-cut lithium niobate crystal by the method of direct femtosecond laser inscription using a highrepetition-rate, chirped-pulse oscillator system. Refractive index contrasts as high as −0.0127 have been achieved for individual modification tracks. The results pave the way for developing microstructured WGs with low-loss operation across a wide spectral range, extending into the mid-infrared region up to the end of the transparency range of the host material.

[1]  I. Bennion,et al.  Model of the femtosecond laser inscription by a single pulse , 2007 .

[2]  S. Boscolo,et al.  Control of the properties of micro-structured waveguides in lithium niobate crystal. , 2013, Optics express.

[3]  M. Withford,et al.  Fabrication of fully integrated antiresonant reflecting optical waveguides using the femtosecond laser direct-write technique. , 2013, Optics letters.

[4]  J. R. Vázquez de Aldana,et al.  Efficient second harmonic generation by birefringent phase matching in femtosecond‐laser‐inscribed KTP cladding waveguides , 2012 .

[5]  Alexander Mikhailovich Streltsov,et al.  Femtosecond-laser writing of tracks with depressed refractive index in crystals , 2003, Photonics Fabrication Europe.

[6]  Simon Gross,et al.  Femtosecond direct-write überstructure waveguide Bragg gratings in ZBLAN. , 2012, Optics letters.

[7]  Role of plasma in femtosecond laser pulse propagation , 2006 .

[8]  Ian Bennion,et al.  RAPID COMMUNICATION: UV femtosecond laser inscribes a 300 nm period nanostructure in a pure fused silica , 2007 .

[9]  K. Nugent,et al.  Refractive index profiling of axially symmetric optical fibers: a new technique. , 2005, Optics express.

[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]  Tsuneo Mitsuyu,et al.  Photowritten optical waveguides in various glasses with ultrashort pulse laser , 1997 .

[12]  C. Menyuk,et al.  Understanding leaky modes: slab waveguide revisited , 2009 .

[13]  R. Graf,et al.  Pearl-chain waveguides written at megahertz repetition rate , 2007 .

[14]  Peter G. Kazansky,et al.  Non-reciprocal ultrafast laser writing , 2008 .

[15]  Mykhaylo Dubov,et al.  Optimisation of microstructured waveguides in z-cut LiNbO3 crystals , 2014 .

[16]  K. Miura,et al.  Writing waveguides in glass with a femtosecond laser. , 1996, Optics letters.

[17]  Amir H Nejadmalayeri,et al.  Ultrafast laser waveguide writing: Lithium niobate and the role of circular polarization and picosecond pulse width. , 2006, Optics letters.

[18]  Feng Chen,et al.  Optical waveguides in crystalline dielectric materials produced by femtosecond‐laser micromachining , 2014 .

[19]  A. Okhrimchuk,et al.  Depressed cladding, buried waveguide laser formed in a YAG:Nd3+ crystal by femtosecond laser writing. , 2005, Optics letters.

[20]  Mi Li Ng,et al.  Low-loss waveguides fabricated in BK7 glass by high repetition rate femtosecond fiber laser. , 2008, Applied optics.

[21]  Ian Bennion,et al.  Point-by-point inscription of 250 nm period structure in bulk fused silica by tightly focused femtosecond UV pulses , 2008 .

[22]  I. Bennion,et al.  Cascaded nonlinear absorption of femtosecond laser pulses in dielectrics , 2009 .

[23]  M. Dubov,et al.  3D reconstruction of the complex dielectric function of glass during femtosecond laser micro-fabrication , 2011 .

[24]  Alexander Jesacher,et al.  Adaptive aberration compensation for three-dimensional micro-fabrication of photonic crystals in lithium niobate. , 2011, Optics express.

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

[26]  Nugent,et al.  Wave field determination using three-dimensional intensity information. , 1992, Physical review letters.

[27]  Yoshimasa Kawata,et al.  Predictive aberration correction for multilayer optical data storage , 2006 .

[28]  I. Bennion,et al.  Inscription and characterization of waveguides written into borosilicate glass by a high-repetition-rate femtosecond laser at 800 nm. , 2010, Applied optics.

[29]  Ian Bennion,et al.  Femtosecond laser microfabrication of subwavelength structures in photonics , 2007, SPIE LASE.

[30]  A Poppe,et al.  Chirped-pulse oscillators: a route to high-power femtosecond pulses without external amplification. , 2004, Optics letters.

[31]  K. Nugent,et al.  Refractive-index profiling of optical fibers with axial symmetry by use of quantitative phase microscopy. , 2002, Optics letters.