Single-mode, high-power, mid-infrared, quantum cascade laser phased arrays
Abstract
We demonstrate single-mode, 16-channel, optical phased arrays based on quantum cascade laser technology, with emission wavelengths around 4.8 µm. The integrated device consists of a distributed feedback seed section, a highly-efficient tree array multi-mode interferometer power splitter, and a 16-channel amplifier array with a 4° angled facet termination. With a single layer Y2O3 coating, the angled facet reflectivity is estimated to be less than 0.1% for suppressing amplifier self-lasing. A peak output power of 30 W is achieved with an emission spectrum narrower than 11 nm and a side mode suppression ratio over 25 dB. Far field distribution measurement result indicates a uniform phase distribution across the array output. Using the same phased array architecture, we also demonstrate single-mode 3.8 µm QCL amplifier arrays with up to 20 W output power.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 05, 2018
- Source ID
- 10.1038/s41598-018-33024-7
Entities
People
- Donghai Wu
- Manijeh Razeghi
- Quan-yong Lu
- Steven Slivken
- Wenjia Zhou
Organizations
- Office of Naval Research