Power and Efficiency Scaling of Fiber OPO Around 700 to 850 nm and Power-scaling of High Coherence Fiber Raman Amplifiers
Abstract
For the first time, fiber Raman lasers produced near-infrared wavelengths from directly diode-pumped by high-power multimode diode sources and on a fiber OPO at red wavelengths. The fiber Raman laser reached 20 W of output power at 1019 nm, pulsed operation at 835 nm, and M square = 2 at 1019 nm from a double-clad fiber Raman laser. These three results are all world records or world firsts. It was also found that the fiber OPO suffers from below-par gain at the anti-stoles wavelength of ~718 nm. An OTDR is constructed to see how the 718 nm power evolves in the gain fiber. This is likely the first time this has been done. We find that the power grows exponentially for the first part of the fiber. After that, the growth is much slower. Even in the high-growth part, the gain is only ~10% of what theory predicts. The reason for this is unclear, but we suspect it is caused by fiber longitudinal fiber variations, which modify the dispersion and therefore disrupt the phase-matching. Attempts to control the dispersion by heating a section of the fiber showed that the conversion did change, but for the worse rather than for the better in these preliminary attempts.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 2013
- Accession Number
- ADA593221
Entities
People
- Jayanta K. Sahu
- Johan Nilsson
Organizations
- University of Southampton