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Highly efficient Raman distributed feedback fibre lasers.
Opt Express. 2012 Feb 27; 20(5):5082-91.OE

Abstract

We demonstrate highly efficient Raman distributed feedback (DFB) fibre lasers for the first time with up to 1.6 W of continuous wave (CW) output power. The DFB Bragg gratings are written directly into two types of commercially available passive germano-silica fibres. Two lasers of 30 cm length are pumped with up to 15 W of CW power at 1068 nm. The threshold power is ~2 W for a Raman-DFB (R-DFB) laser written in standard low-NA fibre, and only ~1 W for a laser written in a high-NA fibre, both of which oscillate in a narrow linewidth of <0.01 nm at ~1117 nm and ~1109 nm, respectively. The slope efficiencies are ~74% and ~93% with respect to absorbed pump power in the low-NA fibre and high-NA fibre respectively. Such high conversion efficiency suggests that very little energy is lost in the form of heat through inefficient energy transfer. Our results are supported by numerical simulations, and furthermore open up for the possibility of having narrow linewidth all-fibre laser sources in wavelength bands not traditionally covered by rare-earth doped silica fibres. Simulations also imply that this technology has the potential to produce even shorter R-DFB laser devices at the centimetre-level and with mW-level thresholds, if Bragg gratings formed in fibre materials with higher intrinsic Raman gain coefficient than silica are used. These materials include for example tellurite or chalcogenide glasses. Using glasses like these would also open up the possibility of having narrow linewidth fibre sources with DFB laser oscillating much further into the IR than what currently is possible with rare-earth doped silica glasses.

Authors+Show Affiliations

Optoelectronics Research Centre, University of Southampton, Highfield, Southampton, SO17 1BJ, UK. jxs@orc.soton.ac.ukNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22418313

Citation

Shi, Jindan, et al. "Highly Efficient Raman Distributed Feedback Fibre Lasers." Optics Express, vol. 20, no. 5, 2012, pp. 5082-91.
Shi J, Alam SU, Ibsen M. Highly efficient Raman distributed feedback fibre lasers. Opt Express. 2012;20(5):5082-91.
Shi, J., Alam, S. U., & Ibsen, M. (2012). Highly efficient Raman distributed feedback fibre lasers. Optics Express, 20(5), 5082-91. https://doi.org/10.1364/OE.20.005082
Shi J, Alam SU, Ibsen M. Highly Efficient Raman Distributed Feedback Fibre Lasers. Opt Express. 2012 Feb 27;20(5):5082-91. PubMed PMID: 22418313.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Highly efficient Raman distributed feedback fibre lasers. AU - Shi,Jindan, AU - Alam,Shaif-ul, AU - Ibsen,Morten, PY - 2012/3/16/entrez PY - 2012/3/16/pubmed PY - 2012/7/4/medline SP - 5082 EP - 91 JF - Optics express JO - Opt Express VL - 20 IS - 5 N2 - We demonstrate highly efficient Raman distributed feedback (DFB) fibre lasers for the first time with up to 1.6 W of continuous wave (CW) output power. The DFB Bragg gratings are written directly into two types of commercially available passive germano-silica fibres. Two lasers of 30 cm length are pumped with up to 15 W of CW power at 1068 nm. The threshold power is ~2 W for a Raman-DFB (R-DFB) laser written in standard low-NA fibre, and only ~1 W for a laser written in a high-NA fibre, both of which oscillate in a narrow linewidth of <0.01 nm at ~1117 nm and ~1109 nm, respectively. The slope efficiencies are ~74% and ~93% with respect to absorbed pump power in the low-NA fibre and high-NA fibre respectively. Such high conversion efficiency suggests that very little energy is lost in the form of heat through inefficient energy transfer. Our results are supported by numerical simulations, and furthermore open up for the possibility of having narrow linewidth all-fibre laser sources in wavelength bands not traditionally covered by rare-earth doped silica fibres. Simulations also imply that this technology has the potential to produce even shorter R-DFB laser devices at the centimetre-level and with mW-level thresholds, if Bragg gratings formed in fibre materials with higher intrinsic Raman gain coefficient than silica are used. These materials include for example tellurite or chalcogenide glasses. Using glasses like these would also open up the possibility of having narrow linewidth fibre sources with DFB laser oscillating much further into the IR than what currently is possible with rare-earth doped silica glasses. SN - 1094-4087 UR - https://www.unboundmedicine.com/medline/citation/22418313/Highly_efficient_Raman_distributed_feedback_fibre_lasers_ L2 - https://www.lens.org/lens/search?q=citation_id:22418313 DB - PRIME DP - Unbound Medicine ER -