JOURNAL OF FACULTY OF ENGINEERING & TECHNOLOGY, Vol 23, No 1 (2016)

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Enhanced efficiency of GaAs-GaxAl1-xAs laser with /4 antireflections coating of TiO2 thin films: an Optical Engineering

KHALID NADEEM RIAZ, HAFEEZ ULLAH, SADIA KHALID, ABDUL SATTAR MALIK, EJAZ AHMED

Abstract

Titanium dioxide (TiO₂) dielectric material was deposited as ~l/4 antireflections (AR) coating on one facet of GaAs-Ga_xAl_1-xAs double heterostructure (DH) laser. Single layer ~ l/4 AR coating was achieved by successive deposition of TiO₂ thin films in vacuum in small steps by thermal evaporation technique, while measuring the threshold current after each coating outside the vacuum. Threshold current, reflectivity and far-field patterns of laser show the significant influence of AR coatings on light output characteristics. Internal loss parameter a and the gain coefficient b for the DH laser were determined from threshold current under the case temperature of the laser.

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Faculty of Engineering and Technology

University of the Punjab

Lahore-54590-Pakistan