Abstract
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.
Highlights
Multi-transverse mode quantum cascade lasers exhibit curious behavior such as the coherent locking of low order modes [1,2] and for wider striped broad-area quantum cascade lasers (BA-QCLs) a dual lobed “bat-ear” far-field pattern as would be produced by a single yet high order transverse mode [3]
Mode creation and temporal response of broad-area quantum cascade lasers (BAQCL) placed within an external feedback cavity are described in this publication
Dynamics are strongly dominated by transverse mode competition ranging for less than 20MHz to greater than 100MHz
Summary
Multi-transverse mode quantum cascade lasers exhibit curious behavior such as the coherent locking of low order modes [1,2] and for wider striped broad-area quantum cascade lasers (BA-QCLs) a dual lobed “bat-ear” far-field pattern as would be produced by a single yet high order transverse mode [3].
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
