journal article·2015-11-20Open access

High-Power Continuous-Wave Directly-Diode-Pumped Fiber Raman Lasers

Tianfu Yao, Achar Harish, Jayanta Sahu, Johan Nilsson

Applied Sciences· Volume 5· Issue 4

Abstract

We describe novel fiber Raman lasers pumped directly by spectrally combined high power multimode laser diodes at ~975 nm and emitting at ~1019 nm. With a commercial multimode graded-index fiber, we reached 20 W of laser output power with a record slope efficiency of 80%. With an in-house double-clad fiber, the beam quality improved to M2 = 1.9, albeit with lower output power and slope efficiency due to higher fiber loss. We believe this is the first publication of a fiber Raman laser cladding-pumped directly by diodes.
Source: crossref · Quality: baseline

Research context

OpenAlex topics: Photonic Crystal and Fiber Optics · Optical Network Technologies · Advanced Fiber Optic Sensors

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, UK

Funding

Engineering and Physical Sciences Research Council · European Office of Aerospace Research and Development

References (22)

Show source-provided references
1. High power fiber lasers: Current status and future perspectives [Invited]10.1364/JOSAB.27.000B63 ↗
2. Shiner, B. (2013, January 10). High power fiber laser technology. Proceedings of the Annual Department of Energy Laser Safety Officer (DOE LSO) Workshop, Boulder, CO, USA.
3. Advances in Raman fibers10.1109/JLT.2002.800263 ↗
4. Agarwal, G.P. (2006). Nonlinear Fiber Optics, Academic press. [4th ed.].10.1016/B978-012369516-1/50011-X ↗
5. High brightness, quantum-defect-limited conversion efficiency in cladding-pumped Raman fiber amplifiers and oscillators10.1364/OE.18.014705 ↗
6. Photodarkening rate in Yb-doped silica fibers10.1364/AO.47.001247 ↗
7. 1064 nm laser-induced defects in pure silica fibers10.1364/OL.38.002717 ↗
8. Raman beam cleanup of a severely aberrated pump laser10.1109/JQE.1985.1072678 ↗
9. Stimulated Raman scattering in multi-mode fibers and its application to beam cleanup and combine10.1142/S0218863502001036 ↗
10. High-power continuous-wave cladding-pumped Raman fiber laser10.1364/OL.31.002290 ↗
11. Zhang, L., Jiang, H., and Feng, Y. (2014, January 18–21). A 1.3 kW Raman fiber laser. Proceedings of the International Photonics and OptoElectronics Meetings, Wuhan, China.10.1364/FBTA.2014.FF4B.1 ↗
12. Ultrabroad-band Raman amplifiers pumped and gain-equalized by wavelength-division-multiplexed high-power laser diodes10.1109/2944.924003 ↗
13. 835 nm fiber Raman laser pulse pumped by a multimode laser diode at 806 nm10.1364/JOSAB.31.000882 ↗
14. An LD-pumped Raman fiber laser operating below one micrometer10.1088/1612-2011/10/8/085103 ↗
15. Yao, T., and Nilsson, J. (2013, January 12–16). Fibre Raman laser directly pumped by multimode laser diode at 975 nm. Proceedings of the Conference on Lasers and Electro-Optics—International Quantum Electronics Conference, Munich, Germany.10.1109/CLEOE-IQEC.2013.6801354 ↗
16. Beam Quality Factor of Higher Order Modes in a Step-Index Fiber10.1002/j.1538-7305.1973.tb02033.x ↗
17. Beam Quality Factor of Higher Order Modes in a Step-Index Fiber10.1109/JLT.2005.863337 ↗
18. Theory of cw Raman oscillation in optical fibers10.1364/JOSA.69.000803 ↗
19. An explanation of SRS beam cleanup in graded-index fibers and the absence of SRS beam cleanup in step-index fibers10.1364/OE.15.017509 ↗
20. Nilsson, J., Sahu, J.K., Jang, J.N., Selvas, R., Hanna, D.C., and Grudinin, A.B. (2002, January 14–17). Cladding-pumped Raman fiber amplifier. Proceedings of the Topical Meeting on Optical Amplifiers and Their Applications, Vancouver, BC, Canada.10.1364/OAA.2002.PD2 ↗
21. Efficient power scaling of laser radiation by spectral beam combining10.1364/OL.33.000384 ↗
22. Design, performance, and limitations of fibers for cladding-pumped Raman lasers10.1016/j.yofte.2010.09.011 ↗