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Proceedings Paper

Widely tunable high-duty-cycle semiconductor terahertz lasers
Author(s): Erik Bruendermann; Danielle R. Chamberlin; Eugene E. Haller
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Paper Abstract

Germanium terahertz (THz) lasers based on a heavy hole-light hole population inversion within the valence bands show strong promise for widespread applications due to their unparalleled frequency tuning range and high output power up to several Watts. Germanium lasers have attractive laser properties: tunability from 1 to 4 THz, high finesse of 106 with line widths below 1 MHz and linear polarization. Laser operation is possible with small mm- sized permanent magnets and closed-cycle refrigeration. Since 1995 we have increased the duty cycle (laser on-time) of such lasers from 10-5 up to 2.5 X 10-2 (2.5%). We report on our current research efforts aimed at achieving continuous wave emission. These efforts include a reduction of the active laser crystal volume from typical values of 30 - 60 mm3 to and perhaps below 1 mm3 and materials and electric field homogeneity improvements to enhance the conversion efficiency. A planar contact geometry is suggested to allow improved heat sinking. Our planned applications include but are not limited to airborne and satellite based research for the study of molecules in the upper atmosphere or in star-forming regions of the universe.

Paper Details

Date Published: 4 May 1999
PDF: 10 pages
Proc. SPIE 3613, Solid State Lasers VIII, (4 May 1999); doi: 10.1117/12.347678
Show Author Affiliations
Erik Bruendermann, Lawrence Berkeley National Lab. (United States)
Danielle R. Chamberlin, Lawrence Berkeley National Lab. (United States)
Eugene E. Haller, Lawrence Berkeley National Lab. (United States)

Published in SPIE Proceedings Vol. 3613:
Solid State Lasers VIII
Richard Scheps, Editor(s)

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