Tilted cavity concept for the high-power wavelength stabilized diodelasers

摘要

We discuss wavelength stabilized all-epitaxial Tilted Cavity Lasers (TCLs). Optical cavity of a TCL favors propagationof only one tilted optical mode ensuring wavelength–selective operation. The possibility of full control of the thermalshift of the lasing wavelength dλ/dT in TCL including positive, zero or negative shift, is proved theoretically. Broad-area(100 gm) 970-nm-range devices have been fabricated showing a high temperature stability of the lasing wavelength(0.13 nm/K), a high power operation (> 7 W in pulsed mode and > 1.5 W in continuous wave (cw) mode), and a narrowvertical far–field beam divergence (FWHM~20). Single transverse mode edge-emitting 4 gm-wide-ridge TCLsdemonstrated high-power spatial and spectral single mode cw operation with a longitudinal side mode suppression ratio(SMSR) up to 41.3 dB at 93 mW output power. Such a result is similar to the best values achieved for DFB lasers in thesame spectral range, while no etching and overgrowth is used in present case.