high and anti-reflection facet coating of high power GaAs/AlGaAs single quantum well lasers
碩士 === 國立交通大學 === 光電工程研究所 === 84 === In this thesis, we present our study on the facet coating of high power GaAs/AlGaAs lasers. Performance of the high power lasers is improved by coatings the combination of AR and HR to the two facets...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
1996
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| Online Access: | http://ndltd.ncl.edu.tw/handle/61460001912499173835 |
| Summary: | 碩士 === 國立交通大學 === 光電工程研究所 === 84 === In this thesis, we present our study on the facet coating of
high power GaAs/AlGaAs lasers. Performance of the high power
lasers is improved by coatings the combination of AR and HR to
the two facets using E-beam evaporation. Anti-reflectivity
coating which consist of a single (/4 thick SiO2 film is
deposited to the front facet (the emission facet) to reduce its
reflectivity from 31% (as-cleaved facet) to 6%. High
reflectivity coating which consists of 3 pairs of quarter wave
SiO2/TiO2 stacks on the back facet to increases the reflectivity
to more than 92%. The combination of AR and HR coating
increases the differential quantum efficiency of light output
from the front facet from the uncoated value 0.55 W/A to 1.1 W/
A. The output power reaches as high as 2W at room temperature
at 2.5 A. The threshold current changes only slightly from 235
mA to 260 mA. The front facet external quantum efficiency has
increased from 0.37 to 0.72. The front facet wall plug
efficiency has increased from 0.225 to 0.37.
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