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Efficient Third-Order Distributed Feedback Laser with Enhanced Beam PatternA third-order distributed feedback laser has an active medium disposed on a substrate as a linear array of segments having a series of periodically spaced interstices therebetween and a first conductive layer disposed on a surface of the active medium on each of the segments and along a strip from each of the segments to a conductive electrical contact pad for application of current along a path including the active medium. Upon application of a current through the active medium, the active medium functions as an optical waveguide, and there is established an alternating electric field, at a THz frequency, both in the active medium and emerging from the interstices. Spacing of adjacent segments is approximately half of a wavelength of the THz frequency in free space or an odd integral multiple thereof, so that the linear array has a coherence length greater than the length of the linear array.
Document ID
20150009355
Acquisition Source
Headquarters
Document Type
Other - Patent
Authors
Hu, Qing
Lee, Alan Wei Min
Kao, Tsung-Yu
Date Acquired
June 2, 2015
Publication Date
May 19, 2015
Subject Category
Lasers And Masers
Funding Number(s)
CONTRACT_GRANT: NNX10AC70G
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-Patent-9,036,674
Patent Application
US-Patent-Appl-SN-14/372,135

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