Microstrip antenna coupled distributed feedback terahertz quantum-cascade lasers

Microstrip antenna coupled distributed feedback terahertz quantum-cascade lasers

By introducing coupled microstrip antennas on distributed feedback terahertz quantum-cascade lasers, the radiation efficiency of each aperture is greatly enhanced. Single mode emission from a 31-period antenna-coupled perfectly phase matched (PM) third-order DFB laser yields ~ 4 times improvement in...

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Bibliographic Details
Published in:CLEO: 2013 pp. 1 - 2
Main Authors: Tsung-Yu Kao, Qing Hu, Reno, John L.
Format: Conference Proceeding
Language:English
Published: The Optical Society 01-06-2013
Subjects:
Laser modes
Measurement by laser beam
Microstrip antennas
Quantum cascade lasers
Surface emitting lasers
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Summary:By introducing coupled microstrip antennas on distributed feedback terahertz quantum-cascade lasers, the radiation efficiency of each aperture is greatly enhanced. Single mode emission from a 31-period antenna-coupled perfectly phase matched (PM) third-order DFB laser yields ~ 4 times improvement in output power comparing with a traditional corrugated third-order DFB laser fabricated on the same gain medium. The 31-period device has ~ 15 × 25° beam divergence and 4 mW pulsed power (4% duty-cycle) at 10K with maximum lasing temperature 134K(pulsed). When phase matching condition is met, emissions from 81 apertures (4-mm long) are coherently combined to form a narrow beam with ~ 12.5° divergence.
ISSN:2160-8989
2160-9004