Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2011 Jun 3;11(6):6003–6014. doi: 10.3390/s110606003

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© 2011 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

PMC Copyright notice

Figure 1. — (a) Transmission of water vapor, methane, carbon monoxide at room temperature and 1 bar [16]. The individual absorption lines are clearly visible. (b) Calculated bandstructure of the THz-QCL. One cascade is marked with the gray box. The growth sequence in nanometers is 9.2/3.0/15.5/4.1/6.6/2.7/8.0/5.5, where the Al.₁₅Ga.₈₅As barriers are marked with bold letters. The lower lasing state is depopulated by a resonant longitudinal optical phonon.