Mode tuning of quantum cascade lasers through optical processing of chalcogenide glass claddings

Shanshan Song, Scott S. Howard, Zhijun Liu, Afusat O. Dirisu, Claire F. Gmachl, Craig B. Arnold

Research output: Contribution to journalArticle

63 Scopus citations

Abstract

In this letter, we demonstrate a method of tuning quantum cascade (QC) lasers by modifying the optical properties of an overlying cladding material. An amorphous chalcogenide cladding layer is deposited through a low temperature, solvent-casting technique that is compatible with current QC laser fabrication and operation. Above band gap illumination (λ < 530 nm) of this cladding causes a permanent change in its index of refraction leading to a change of the modal refractive index and a corresponding modal shift in the laser. Combined with deep-etched distributed Bragg gratings, a tuning of over 30 nm is obtained at an operating wavelength of 7.9 μm for constant current and temperature.

Original languageEnglish (US)
Article number041115
JournalApplied Physics Letters
Volume89
Issue number4
DOIs
StatePublished - Aug 4 2006

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Fingerprint Dive into the research topics of 'Mode tuning of quantum cascade lasers through optical processing of chalcogenide glass claddings'. Together they form a unique fingerprint.

  • Cite this