Search Menu
Photonics Media Photonics Buyers' Guide Photonics Spectra BioPhotonics EuroPhotonics Vision Spectra Photonics Showcase Photonics ProdSpec Photonics Handbook
More News

Quantum-Cascade Lasers Pass Detection Test

Facebook Twitter LinkedIn Email Comments
Research exploring directly modulated quantum-cascade lasers as telecommunications detectors generally has used HgCdTe materials, but intersubband devices and intracavity modulators also show potential for high-speed detection.

Accordingly, physicists at the University of Neuchâtel in Switzerland evaluated two quantum-cascade laser structures operating as photodetectors up to room temperature. One was a 5.3-µm two-phonon-resonance structure that demonstrated a peak responsivity of 120 µA/W at 2200 cm-1 and that operated at temperatures up to 325 K. The other device, a 9.3-µm bound-to-continuum transition laser, had a responsivity of only 50 µA/W at 1330 cm-1 and operated up to 297 K.

As reported in the Oct. 7 issue of Applied Physics Letters, the absorption peak of both devices shifted easily with application of a low-voltage bias, suggesting applications in free-space optical communications.

Photonics Spectra
Dec 2002
CommunicationsResearch & TechnologySensors & DetectorsTech Pulse

back to top
Facebook Twitter Instagram LinkedIn YouTube RSS
©2019 Photonics Media, 100 West St., Pittsfield, MA, 01201 USA,

Photonics Media, Laurin Publishing
x Subscribe to Photonics Spectra magazine - FREE!
We use cookies to improve user experience and analyze our website traffic as stated in our Privacy Policy. By using this website, you agree to the use of cookies unless you have disabled them.