Analysis and experimental demonstration of spatial mode selection in a coherently combined fiber laser
Abstract
Self-phasing due to spatial mode selection in a two-element passively coupled fiber laser is studied. We find that the addition of a second supermode in a coupled resonator results in a 90% increase in the average output power and nearly π/2 radians of passive phase adjustment versus applied phase errors between the gain elements. These results require a phase of zero (modulo 2π) between the beams in the external cavity. These findings are supported by an eigenmode analysis of the resonator and show that beam recycling is a useful resonator design feature but must be appropriately implemented to obtain beneficial results.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 14, 2020
- Source ID
- 10.1364/oe.28.001854
Entities
People
- Erik Tilseth
- James Leger
- Mint Kunkel
Organizations
- Air Force Office of Scientific Research