Electrically pumped semiconductor laser with low spatial coherence and directional emission
Abstract
We design and fabricate an on-chip laser source that produces a directional beam with low spatial coherence. The lasing modes are based on the axial orbit in a stable cavity and have good directionality. To reduce the spatial coherence of emission, the number of transverse lasing modes is maximized by fine-tuning the cavity geometry. In a cavity with the size of hundreds of micrometers, 1000 transverse modes lase simultaneously and independently, reducing the speckle contrast to 0.03. Decoherence is reached in a few nanoseconds as a result of frequency detuning of lasing modes. Such rapid decoherence will facilitate applications in ultrafast speckle-free full-field imaging.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 12, 2019
- Source ID
- 10.1063/1.5109234
Entities
People
- Hui Cao
- Kyungduk Kim
- Qi Jie Wang
- Seng Fatt Liew
- Stefan Bittner
- Yongquan Zeng
Organizations
- Air Force Office of Scientific Research
- Ministry of Education
- Nanyang Technological University
- National Research Foundation
- Office of Naval Research
- Yale University