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Apparatus and method for providing a single-mode grating-outcoupled surface emitting laser with detuned second-order outcoupler grating
Apparatus and method for providing a single-mode grating-outcoupled surface emitting laser with detuned second-order outcoupler grating
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机译:提供具有失谐二阶外耦合器光栅的单模光栅外耦合表面发射激光器的设备和方法
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摘要
An improved grating-outcoupled surface-emitting semiconductor laser architecture is provided. A second-order grating is placed between two distributed Bragg reflector gratings. The period of the second order grating is positively or negatively detuned from the distributed Bragg reflector selected optical wavelength at which the laser operates. Detuning of the second-order grating towards shorter or longer wavelengths allows kink-free, linear LI curves light output versus forward current) for grating-outcoupled surface-emitting lasers. Due to the detuning of the outcoupler grating, the outcoupled radiation emits two beams that deviate slightly from the normal axis. A design point may then be chosen where the power outcoupled by symmetric and antisymmetric modes cross and where the outcoupled power is independent of the phase variation.
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