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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 37, Iss. 4 — Feb. 15, 2012
  • pp: 470–472

Adaptive slit beam shaping for direct laser written waveguides

P. S. Salter, A. Jesacher, J. B. Spring, B. J. Metcalf, N. Thomas-Peter, R. D. Simmonds, N. K. Langford, I. A. Walmsley, and M. J. Booth  »View Author Affiliations


Optics Letters, Vol. 37, Issue 4, pp. 470-472 (2012)
http://dx.doi.org/10.1364/OL.37.000470


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Abstract

We demonstrate an improved method for fabricating optical waveguides in bulk materials by means of femtosecond laser writing. We use an LC spatial light modulator (SLM) to shape the beam focus by generating adaptive slit illumination in the pupil of the objective lens. A diffraction grating is applied in a strip across the SLM to simulate a slit, with the first diffracted order mapped onto the pupil plane of the objective lens while the zeroth order is blocked. This technique enables real-time control of the beam-shaping parameters during writing, facilitating the fabrication of more complicated structures than is possible using nonadaptive methods. Waveguides are demonstrated in fused silica with a coupling loss to single-mode fibers in the range of 0.2 to 0.5 dB and propagation loss <0.4dB/cm.

© 2012 Optical Society of America

OCIS Codes
(140.3390) Lasers and laser optics : Laser materials processing
(220.4000) Optical design and fabrication : Microstructure fabrication
(230.7370) Optical devices : Waveguides
(220.1080) Optical design and fabrication : Active or adaptive optics

ToC Category:
Optical Devices

History
Original Manuscript: September 28, 2011
Revised Manuscript: November 16, 2011
Manuscript Accepted: December 12, 2011
Published: February 6, 2012

Citation
P. S. Salter, A. Jesacher, J. B. Spring, B. J. Metcalf, N. Thomas-Peter, R. D. Simmonds, N. K. Langford, I. A. Walmsley, and M. J. Booth, "Adaptive slit beam shaping for direct laser written waveguides," Opt. Lett. 37, 470-472 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-4-470

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