Coherent light generators – Particular beam control device – Tuning
Reexamination Certificate
2005-08-15
2010-06-08
Harvey, Minsun (Department: 2828)
Coherent light generators
Particular beam control device
Tuning
Reexamination Certificate
active
07733924
ABSTRACT:
A widely tunable, mode-hop-free semiconductor laser operating in the mid-IR comprises a QCL laser chip having an effective QCL cavity length, a diffraction grating defining a grating angle and an external cavity length with respect to said chip, and means for controlling the QCL cavity length, the external cavity length, and the grating angle. The laser of claim1wherein said chip may be tuned over a range of frequencies even in the absence of an anti-reflective coating. The diffraction grating is controllably pivotable and translatable relative to said chip and the effective QCL cavity length can be adjusted by varying the injection current to the chip. The laser can be used for high resolution spectroscopic applications and multi species trace-gas detection. Mode-hopping is avoided by controlling the effective QCL cavity length, the external cavity length, and the grating angle so as to replicate a virtual pivot point.
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Curl Robert F.
Tittel Frank K.
Wysocki Gerard
Carroll Rodney B.
Conley & Rose, P.C.
Harvey Minsun
Stafford Patrick
William Marsh Rice University
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