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Optics Letters

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  • Editor: Anthony J. Campilo
  • Vol. 32, Iss. 17 — Sep. 1, 2007
  • pp: 2559–2561

Single-step writing of Bragg grating waveguides in fused silica with an externally modulated femtosecond fiber laser

Haibin Zhang, Shane M. Eaton, and Peter R. Herman  »View Author Affiliations


Optics Letters, Vol. 32, Issue 17, pp. 2559-2561 (2007)
http://dx.doi.org/10.1364/OL.32.002559


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Abstract

For the first time to our knowledge, high-strength ( > 30 dB ) first-order Bragg grating waveguides were fabricated in bulk fused silica glass in a single-scanning step by modulating a high-repetition-rate femtosecond fiber laser with an external acousto-optic modulator. The modulation induced a waveguide segmentation by delivering controlled bursts of laser pulses to define an array of partially overlapped refractive index voxels. With appropriate choice of modulation frequency and sample scanning speed, low loss waveguides could be formed at high writing speeds to yield sharp Bragg spectral resonances tunable over the 1300 to 1550 nm telecom band. Effects of acousto-optic modulation duty cycle on propagation loss and grating strength are characterized. This modulation method offers facile control and integration of multiwavelength Bragg grating devices to enhance overall functionality of optical circuits in three-dimensional geometries.

© 2007 Optical Society of America

OCIS Codes
(230.1480) Optical devices : Bragg reflectors
(230.7370) Optical devices : Waveguides
(320.2250) Ultrafast optics : Femtosecond phenomena
(350.3390) Other areas of optics : Laser materials processing

ToC Category:
Optical Devices

History
Original Manuscript: June 8, 2007
Revised Manuscript: July 17, 2007
Manuscript Accepted: July 21, 2007
Published: August 21, 2007

Citation
Haibin Zhang, Shane M. Eaton, and Peter R. Herman, "Single-step writing of Bragg grating waveguides in fused silica with an externally modulated femtosecond fiber laser," Opt. Lett. 32, 2559-2561 (2007)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-32-17-2559


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