Journal of Physical Chemistry & Biophysics
Open Access
ISSN: 2161-0398
+44 1478 350008
ISSN: 2161-0398
+44 1478 350008
Dan Botez1, J D Kirch1, C-C Chang1, C Boyle1, L J Mawst1, D Lindberg III2 and T Earles2
1University of Wisconsin, USA 2Intraband, LLC, USA
Scientific Tracks Abstracts: J Phys Chem Biophys
Resonant leaky-wave coupling of antiguides has been used for phase-locking near-infrared (IR) lasers to high pulsed (10 W) and CW (1.6 W) near diffraction-limited (D.L.) powers. The structures are analogous to 2nd-order lateral distributed-feedback (DFB) structures; thus, they represent high-index-contrast (HC) (��n â�� 0.10) photonic-crystal (PC) structures that allow global coupling between array elements in an in-phase mode of uniform intensity profile. For mid-IR QCLs coherence over large apertures has been reported from PCDFB lasers and master-oscillator power-amplifier (MOPA) structures. PCDFBs involve diffraction gratings; thus, inherently have low index contrast (��n ~ 0.008) and have shown near-D.L. operation to only 0.5 W/facet pulsed power. Flared MOPAs, have shown near-D.L operation to 3.9 W, but have no index steps; thus, are vulnerable to thermal lensing in quasi-CW or CW operation. We have implemented resonant leaky-wave coupling in 8.4 �¼m-emitting arrays of QCLs. Preliminary results are 5.5 W near-D.L. peak powers. Such HC-PC structures hold potential for >5 W quasi-CW coherent power in the 8-10 �¼m wavelength range, and >5 W CW coherent power in the 4.5-5.5 �¼m wavelength range. Furthermore, in combination with singlelobe- emitting, 2nd-order metal/semiconductor gratings, such arrays hold potential for >15 W CW surface-emitted, coherent power from 2-D HC-PC mid-IR QCLs.
Dan Botez is Philip Dunham Reed Professor at the University of Wisconsin-Madison. He received his PhD from University of California, Berkeley. He is co-inventor of the resonant-optical-waveguide array concept which represents the first photonic-crystal laser structure for spatial-mode control. His recent work focused on midinfrared quantum cascade lasers (QCLs), which led to the first model for carrier leakage in QCLs. He is a Fellow member of the IEEE and OSA, and recipient of the 2010 OSA Nick Holonyak Jr. Award. He has authored or co-authored more than 400 technical publications of which over 300 were refereed, and holds 52 patents.
Email: botez@engr.wisc.edu