Dresden 2009 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 6: Nanophotonics - Theory of Nanophotonic Devices II
DS 6.2: Topical Talk
Montag, 23. März 2009, 14:30–15:00, GER 38
Novel Concepts of High Power Diode Lasers: High Brilliance and Wavelength Stabilization — •Vitaly Shchukin1,2, Nikolai Ledentsov1,2, and Dieter Bimberg1 — 1Technische Universitaet Berlin, Berlin, Germany — 2Present address: VI Systems GmbH, Berlin, Germany
Novel concepts of high power diode lasers enable solving the problem existing since decades: poor beam quality and an unstable wavelength of lasing rapidly shifting upon current and temperature variations.
i) Photonic Band Crystal Laser provides a strong discrimination of a fundamental mode localized at an optical defect against the rest not localized modes, which enables a single mode lasing from an ultra-broad waveguide (WG), and thus high brilliance narrow beam operation.
ii) Tilted Cavity Laser contains a narrow cavity and a multilayer interference reflector (MIR). Different angular behavior of the cavity mode wavelength and MIR reflectance maximum provides wavelength-selective leakage loss from the cavity through the MIR and enables wavelength-stabilized operation. The theory predicts a possibility to reach zero and even negative thermal shift of the lasing wavelength.
iii) Tilted Wave Laser contains a narrow WG coupled with a broad WG. Light generated in the narrow WG leaks to the broad WG, propagates there as a tilted wave, is reflected back, and returns to the narrow WG. The phase matching conditions between the wave propagating along the narrow WG and the returned wave govern the wavelength-stabilized lasing, and the broad WG promotes an ultra-narrow beam.
Modeling and experimental proof-of-concepts will be presented.