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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 1 — Jan. 2, 2012
  • pp: 576–582

CO2 laser induced refractive index changes in optical polymers

Qing Liu, Kin Seng Chiang, Laurence Reekie, and Yuk Tak Chow  »View Author Affiliations

Optics Express, Vol. 20, Issue 1, pp. 576-582 (2012)

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We study the infrared photosensitivity properties of two optical polymer materials, benzocyclobutene (BCB) and epoxy OPTOCAST 3505, with a 10.6 μm CO2 laser. We discover that the CO2 laser radiation can lower the refractive index of BCB by as much as 5.5 × 10−3, while inducing no measurable index change in the epoxy. As confirmed by Fourier transform infrared spectroscopy, the observed index change in BCB can be attributed to photothermal modification of chemical bonds in the material by the CO2 laser radiation. Our findings open up a new possibility of processing polymer materials with a CO2 laser, which could be further developed for application in the areas of post-processing and direct-writing of polymer waveguide devices.

© 2011 OSA

OCIS Codes
(140.3390) Lasers and laser optics : Laser materials processing
(140.3470) Lasers and laser optics : Lasers, carbon dioxide
(160.5470) Materials : Polymers
(250.5460) Optoelectronics : Polymer waveguides
(160.5335) Materials : Photosensitive materials

ToC Category:
Laser Microfabrication

Original Manuscript: October 14, 2011
Revised Manuscript: December 6, 2011
Manuscript Accepted: December 8, 2011
Published: December 22, 2011

Qing Liu, Kin Seng Chiang, Laurence Reekie, and Yuk Tak Chow, "CO2 laser induced refractive index changes in optical polymers," Opt. Express 20, 576-582 (2012)

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