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SUMMARY:Terahertz Science and Technology – from challenges to opportunit
 ies - Professor Edmund Linfield\, School of Electronic &amp\; Electrical E
 ngineering\, University of Leeds
DTSTART:20150218T160000Z
DTEND:20150218T170000Z
UID:TALK58058@talks.cam.ac.uk
CONTACT:Leona Hope-Coles
DESCRIPTION:The terahertz frequency range of the electromagnetic spectrum 
 has a broad number of potential applications across the physical\, medical
  and biological sciences.  Yet its full potential has historically not bee
 n realized owing to the lack of compact\, solid state\, sources and detect
 ors.  \n\nThe demonstration in 2002 of the first terahertz frequency quant
 um cascade laser opened up a plethora of new opportunities\, with sources 
 now capable of delivering output powers exceeding 1 W.  I will outline how
  photonic patterning can be used to select specific frequencies and contro
 l output beam profiles\, and how the laser gain can be probed by\, and the
  laser locked with\, near-infrared femtosecond laser technologies.  I will
  then discuss the development of self-mixing imaging systems\, which use t
 he quantum cascade laser itself as a coherent detector\, enabling: reflect
 ion imaging at distances exceeding 7 m\; the demonstration of swept-freque
 ncy interferometry\; and\, coherent three-dimensional imaging.  The talk w
 ill conclude by outlining the potential of terahertz quantum cascade laser
 s for use as local oscillators in satellite-based instrumentation for eart
 h observation and planetary science\, and the application of terahertz fre
 quency instrumentation in the study of both condensed matter and biologica
 l systems.\n
LOCATION:Pippard Lecture Theatre\, Cavendish Laboratory
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