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High-power operation and lateral divergence angle reduction of broad-area laser diodes at 976 nm
- Source :
- Optics & Laser Technology
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- Broad-area diode lasers with high output power and low lateral divergence angle are highly desired for extensive scientific and industrial applications. Here, we report on the epitaxial design for higher output power and a flared waveguide design for reduced divergence, which leads to high power operation with a low lateral divergence angle. A vertically asymmetric epitaxial structure was employed and optimized for low internal optical loss and high efficiency to realize high output power operation. Using a flared waveguide design, the lateral divergence angle was efficiently reduced by decreasing the number of high-order lateral optical modes significantly. The flared waveguide design introduces a smooth modification of the ridge width along the cavity without deteriorating laser performance. Based on the optimized epitaxial and waveguide design, we scaled the waveguide width to realize high continuous-wave power of 34.5 W at 25 °C. A low lateral divergence angle of 8° and high power conversion efficiency of 60% were achieved at the operating power level of 25 W. The life test data (30 A at 45 °C for 39 units, 0 failures in 1000 h) demonstrated reliable operation illustrating the efficient design for reduced lateral divergence angle and high operating power.
- Subjects :
- Semiconductor laser
Materials science
Physics::Optics
02 engineering and technology
Waveguide (optics)
law.invention
Reduction (complexity)
020210 optoelectronics & photonics
Optics
law
Low divergence angle
0202 electrical engineering, electronic engineering, information engineering
Electrical and Electronic Engineering
Divergence (statistics)
Diode
business.industry
Energy conversion efficiency
Diode laser
976 nm
021001 nanoscience & nanotechnology
Laser
Ridge (differential geometry)
Atomic and Molecular Physics, and Optics
Electronic, Optical and Magnetic Materials
Power (physics)
0210 nano-technology
business
High power
High efficiency
High brightness
Subjects
Details
- ISSN :
- 00303992
- Volume :
- 141
- Database :
- OpenAIRE
- Journal :
- Optics & Laser Technology
- Accession number :
- edsair.doi.dedup.....02d338e39724d372be4a4c74cef04c90