Wavelength division with three-dimensional couplers fabricated by filamentation of femtosecond laser pulses.

Refractive-index changes can be induced by filamentation of 800-nm, 1-kHz femtosecond laser pulses in silica glass. Two-dimensional translation of a 40-microm-long filament leads to the formation of a curved waveguide because of bending by the previously induced refractive-index change. The fabrication of 2-mm directional couplers to split the coupled beam into 1:1 at a wavelength of 632.8 nm is demonstrated. The realization of three-dimensional directional couplers and wavelength division in the output from the couplers is also demonstrated.

[1]  Kaoru Minoshima,et al.  Fabrication of coupled mode photonic devices in glass by nonlinear femtosecond laser materials processing. , 2002, Optics express.

[2]  A. Gaeta,et al.  Infrared photosensitivity in silica glasses exposed to femtosecond laser pulses. , 1999, Optics letters.

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

[4]  J. Nishii,et al.  In situ observation of photoinduced refractive-index changes in filaments formed in glasses by femtosecond laser pulses. , 2001, Optics letters.

[5]  E. Mazur,et al.  Ultrafast-laser driven micro-explosions in transparent materials , 1997 .

[6]  J G Fujimoto,et al.  Photonic device fabrication in glass by use of nonlinear materials processing with a femtosecond laser oscillator. , 2001, Optics letters.

[7]  Olga G. Kosareva,et al.  Random deflection of the white light beam during self-focusing and filamentation of a femtosecond laser pulse in water , 2002 .

[8]  Kazuyoshi Itoh,et al.  Anisotropic refractive-index change in silica glass induced by self-trapped filament of linearly polarized femtosecond laser pulses , 2003 .

[9]  E. Mazur,et al.  Micromachining bulk glass by use of femtosecond laser pulses with nanojoule energy. , 2001, Optics letters.

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

[11]  J. Nishii,et al.  Optical seizing and merging of voids in silica glass with infrared femtosecond laser pulses. , 2000, Optics letters.

[12]  Andreas Tünnermann,et al.  Optical properties of waveguides fabricated in fused silica by femtosecond laser pulses. , 2002, Applied optics.