Title

Direct Femtosecond Laser Writing Of Waveguides In As2S3 Thin Films

Abstract

Single-channel waveguides and Y couplers were fabricated in chalcogenide thin films by use of femtosecond laser pulses from a 25-MHz repetition rate Ti:sapphire laser. Refractive-index differentials (Δn > 10-2) were measured through interferometric microscopy and are higher than the typical values reported for oxide glasses. The dependence of the index differential on the peak intensity reveals the nonlinear nature of the photosensitivity in arsenic trisulfide below its bandgap energy, and the refractive-index change is correlated to the photoinduced structural changed inferred by Raman spectroscopy data. A free-electron model to predict the parametric dependence of Δn is proposed. © 2004 Optical Society of America.

Publication Date

4-1-2004

Publication Title

Optics Letters

Volume

29

Issue

7

Number of Pages

748-750

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/OL.29.000748

Socpus ID

1942454367 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/1942454367

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