Journal
OPTICS EXPRESS
Volume 19, Issue 10, Pages 9074-9085Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.19.009074
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Funding
- Centre for Earth Observation Instrumentation
- Technology Strategy Board (TSB)
- NERC [NE/H002383/1]
- Natural Environment Research Council [NE/H002383/1] Funding Source: researchfish
- NERC [NE/H002383/1] Funding Source: UKRI
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An integrated optic approach, using hollow waveguides, has been evaluated for a compact, rugged, high efficiency heterodyne optical mixing circuit in the middle infrared. The approach has involved the creation of hollow waveguides and alignment features for a beam combiner component in a glass-ceramic substrate. The performance of the integrated beam combiner was tested as part of a full laser heterodyne spectro-radiometer in which a quantum cascade laser local oscillator emitting at 9.7 mu m was mixed with incoherent radiation. The performance has been evaluated with both cryogenically-cooled and peltier-cooled photomixers demonstrating consistent detection limits of two and five times the shot noise limit, respectively. The hollow waveguide mixer has also shown advantages in temporal stability, laser spatial mode cleansing, and reduced sensitivity to optical feedback. (C) 2011 Optical Society of America
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