Accession Number:

ADA492496

Title:

New Widely Tunable Room-Temperature Terahertz Coherent Sources

Descriptive Note:

Final performance rept. 1 Jul 2005-30 Jun 2008

Corporate Author:

HARVARD UNIV CAMBRIDGE MA SCHOOL OF ENGINEERING AND APPLIED SCIENCES

Personal Author(s):

Report Date:

2008-09-30

Pagination or Media Count:

13.0

Abstract:

The objective of this proposal was to develop a new type of THz semiconductor sources that are injection-pumped, efficient, compact, narrowband, tunable, and can operate at room temperature. The proposed device was a mid-infrared InGaAsAlInAs Quantum Cascade Laser QCLs with the waveguide core containing a multi-functional coupled-quantum-well active region that supports both laser action in the mid-infrared and THz generation due to resonant coherent beating of two laser modes. During the course of the work a path was also found to substantially improve the temperature performance and directionality of conventional THz QCLs in which an electronic transition is used for the direct generation of THz radiation. The following was accomplished first room temperature operation of an elctrically pumped quantum cascade laser based THz source, using intra-cavity nonlinear optics record operating temperature 180K of a conventional THz Quantum Cascade Laser, using a copper double metal waveguide for low loss surface emitting THz QCLs with low beam divergence.

Subject Categories:

  • Electrical and Electronic Equipment
  • Electricity and Magnetism
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE