High power, low divergent, substrate emitting quantum cascade ring laser in continuous wave operation | Zendy

Donghai Wu | Zendy; M. Razeghi | Zendy

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High power, low divergent, substrate emitting quantum cascade ring laser in continuous wave operation

Author(s) -

Donghai Wu,

M. Razeghi

Publication year - 2017

Publication title -

apl materials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.571

H-Index - 60

ISSN - 2166-532X

DOI - 10.1063/1.4978810

Subject(s) - materials science , grating , continuous wave , cascade , optoelectronics , optics , quantum cascade laser , radius , semiconductor laser theory , laser , substrate (aquarium) , semiconductor , physics , chemistry , computer security , oceanography , chromatography , terahertz radiation , computer science , geology

We demonstrate a surface grating coupled substrate emitting quantum cascade ring laser with high power room temperature continuous wave operation at 4.64 μm. A second order surface metal/semiconductor distributed-feedback grating is used for in-plane feedback and vertical out-coupling. A device with 400 μm radius ring cavity exhibits an output power of 202 mW in room temperature continuous wave operation. Single mode operation with a side mode suppression ratio of 25 dB is obtained along with a good linear tuning with temperature. The far field measurement exhibits a low divergent concentric ring beam pattern with a lobe separation of ∼0.34°, which indicates that the device operates in fundamental mode (n = 1)

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