Optofluidic distributed feedback lasers with evanescent pumping: Reduced threshold and angular dispersion analysis | Zendy

Markus Karl | Zendy; Guy L. Whitworth | Zendy; Marcel Schubert | Zendy; Christof P. Dietrich | Zendy; Ifor D. W. Samuel | Zendy; Graham A. Turnbull | Zendy; Malte C. Gather | Zendy

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Optofluidic distributed feedback lasers with evanescent pumping: Reduced threshold and angular dispersion analysis

Author(s) -

Markus Karl,

Guy L. Whitworth,

Marcel Schubert,

Christof P. Dietrich,

Ifor D. W. Samuel,

Graham A. Turnbull,

Malte C. Gather

Publication year - 2016

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4954650

Subject(s) - lasing threshold , grating , materials science , optics , refractive index , dispersion (optics) , laser , optoelectronics , semiconductor laser theory , waveguide , physics

We demonstrate an evanescently pumped water-based optofluidic distributed feedback (DFB) laser with a record low pump threshold of ETH=520 nJ. The low threshold results from an optimized mode shape, which is achieved by a low refractive index substrate, and from the use of a mixed-order DFB grating. Investigating the photonic band structure via angular dispersion analysis both above and below lasing threshold allows us to measure the refractive index of the liquid gain layer and to determine the device parameters such as the waveguide core layer thickness. We show that it is possible to tailor the divergence of the lasing emission by varying the number of second order grating periods used for outcoupling.

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