Browsing by Author "Chang, Ting-Yuan"

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Electrically pumped quantum dot surface emitting lasers with Bragg grating capped by ITO cladding layers
(2016)
Hong, Kuo-Bin
;
Chang, Ting-Yuan
;
Pan, Chien-Hung
;
Lin, Chien-Hung
;
Lin, Gray
QD based Bragg gratings surface emitting lasers using ITO as transparent cladding layers were demonstrated. Measured lasing peak locates at 1298nm and threshold current density of 210 A/cm(2). The laser shows extremely small divergence surface-emitted beam and thermal redshift of 0.08 nm/K in peak wavelength.
Quantum-Dot Surface Emitting Distributed Feedback Lasers Using Indium-Tin-Oxide as Top Claddings
(2016-08-01)
Chang, Ting-Yuan
;
Pan, Chien-Hung
;
Hong, Kuo-Bin
;
Lin, Chien-Hung
;
Lin, Gray
We demonstrate InAs/InGaAs quantum-dot surface emitting distributed feedback (SE-DFB) lasers, using an indium-tin-oxide layer as top cladding, which eliminates the regrowth process used in conventional DFB lasers to greatly simplify laser process. The lasing peak near 1.30 mu m realized using the grating period of 375 nm exhibited a 0.13-nm linewidth and a low-temperature red-shift rate of 0.1 nm/K. The laser had a threshold current density of 210 A/cm(2) and a characteristic temperature of 94.6 K. The surface emitting laser light had the divergence angles of less than 1 degrees and 8 degrees similar to 9 degrees along and perpendicular to the grating direction, respectively.