Experimental investigation of broad area quantum cascade lasers under external feedback

Mode creation and temporal response of broad-area quantum cascade lasers (BA-QCL) placed within an external feedback cavity are described in this publication. The critical feedback parameter becomes the mirror angle relative to the BA-QCL facet. With judicious angle choices, a plethora of curious mo...

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Bibliographic Details
Published in:Optics express 2018-07, Vol.26 (14), p.17927-17935
Main Authors: Newell, T C, Grillot, F, Gavrielides, A, Kaspi, R, Lu, C, Yang, C, Bate, T, Luong, S
Format: Article
Language:English
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Summary:Mode creation and temporal response of broad-area quantum cascade lasers (BA-QCL) placed within an external feedback cavity are described in this publication. The critical feedback parameter becomes the mirror angle relative to the BA-QCL facet. With judicious angle choices, a plethora of curious modes can be created, each with their particular threshold and slope efficiency. These range from a nearly single far-field intensity peak to highly multimode emission similar to their diode counterparts. Dynamics are strongly dominated by transverse mode competition ranging for less than 20MHz to greater than 100MHz. When the mirror is parallel to the facet, higher frequency external cavity oscillations become undamped.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.26.017927