1 Scopus citations

Abstract

Quantum cascade lasers (QCLs) have become a key component in the development of optical approaches to sensing applications. Recent experiments have shown the ability to achieve second harmonic generation from these structures suggesting the possibility of achieving short wave-infrared output. However, in these cases the power of the non-linear mode is limited by its phase mismatch with the fundamental cavity mode. By modifying the effective index of the laser system through cladding, one may ameliorate the mismatch to increase power output. In this study, we develop a simple method for drop-coating arsenic sulfide (As2S3) glass on QCLs. The glass is processed by above band-gap illumination, which induces a change in the refractive index resulting in a shift of the output mode of the laser. We observe the effective index to change by a factor 1.3 × 10-4 after 20 minutes of illumination at 312 nm for the fundamental wavelength of the QCL. Below band-gap irradiation, such as that occurring during device operation, is confirmed to have no effect on the material. Studies of the output of QCLs reveal for the first time mode shifting of the spectra as a result of optical modification to a cladding layer.

Original languageEnglish (US)
Article number05
Pages (from-to)293-300
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5713
DOIs
StatePublished - Aug 22 2005
EventPhoton Processing in Microelectronics and Photonics IV - San Jose, CA, United States
Duration: Jan 24 2005Jan 27 2005

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Keywords

  • Arsenic sulfide
  • Chalcogenide glass
  • Laser processing
  • QCL
  • Quantum cascade laser
  • Second harmonic generation

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