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Fabrication and analysis of highly-reflective metal-dielectric mirrors for high-performance semiconductor laser applications.
- Source :
-
Current Applied Physics . Feb2016, Vol. 16 Issue 2, p155-159. 5p. - Publication Year :
- 2016
-
Abstract
- The device performance improvement of ridge waveguide (RWG) laser diodes (LDs), operating at a wavelength (λ) of ∼960 nm, with a metal-dielectric high-reflection (HR) mirror consisting of Au/Ti–SiO 2 layers on the back facet was demonstrated. To determine the optimum thickness of each layer, optical reflection calculations were performed using a rigorous coupled-wave analysis method, which leads to the resultant Au (80 nm)/Ti (5 nm)–SiO 2 (164 nm) layers. The layers exhibited a broad high reflection band of >91% over a wavelength range of 920–1000 nm, indicating the reflectivity of ∼91.2% at λ ∼ 960 nm. For 2 mm-cavity RWG LDs with the Au/Ti–SiO 2 HR mirror, an enhanced maximum output power (P max ) of 499.3 mW at an injection current of 3000 mA and a decreased threshold current (I th ) of 516 mA (i.e., P max = 259.4 mW and I th = 650 mA for the uncoated LDs) were obtained, showing an increased slope efficiency percentage of 82%. The external differential quantum efficiency was also increased from ∼17.1 to ∼31.1%. Also, the full widths at half maximum values of beam divergences of the device were 38° (vertical direction) and 4° (horizontal direction). [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 15671739
- Volume :
- 16
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Current Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 111929236
- Full Text :
- https://doi.org/10.1016/j.cap.2015.11.009