Close

Search

Search Menu
Photonics Media Photonics Buyers' Guide Photonics EDU Photonics Spectra BioPhotonics EuroPhotonics Industrial Photonics Photonics Showcase Photonics ProdSpec Photonics Handbook
More News
SPECIAL ANNOUNCEMENT
2016 Photonics Buyers' Guide Clearance! – Use Coupon Code FC16 to save 60%!
share
Email Facebook Twitter Google+ LinkedIn Comments

Quantum-Cascade Lasers Pass Detection Test

Photonics Spectra
Dec 2002
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.


Comments
Terms & Conditions Privacy Policy About Us Contact Us
back to top

Facebook Twitter Instagram LinkedIn YouTube RSS
©2016 Photonics Media
x Subscribe to Photonics Spectra magazine - FREE!