Balaswamy, V and Harshitha, S and Ramachandran, S and Supradeepa, VR (2019) High power, ultra-high spectral purity, broadly wavelength tunable cascaded Raman fiber laser. In: Fiber Lasers XVI: Technology and Systems 2019, 4 - 7 February 2019, San Francisco.
Full text not available from this repository.Abstract
Cascaded Raman fiber lasers is the only proven technology which enables high power continuous wave (CW) fiber laser sources outside rare-earth emission bandwidths. Among these systems, recently demonstrated cascaded Raman fiber lasers based on Random distributed feedback (RDFB) provide wavelength agility enabling high-power, ultra-broad band wavelength tunable fiber lasers. However, these systems are limited in terms of power scaling due to degrading spectral purity with increasing input pump power which in turn limits the applicability of these systems. This is due to conversion of desired wavelength into next higher order Raman stokes with increase in pump power. In this work, we demonstrate a high power, ultra-high spectral purity, broadly wavelength tunable cascaded Raman fiber laser. This was enabled by culmination of two significant advances over the last year. To terminate the Raman cascade at the required output wavelength, we utilized our recently proposed distributed filtered feedback mechanism. To achieve high spectral purity, we used a recently demonstrated technique of using high power fiber based Amplified Spontaneous emission (ASE) sources as the input pump. A maximum output power of ~33W at 1.5μm and ~27W at 1.4μm was achieved. High spectral purity of <97% at the final wavelength was achieved over a wide-range of output powers.
| Item Type: | Conference Paper |
|---|---|
| Publication: | Proceedings of SPIE - The International Society for Optical Engineering |
| Publisher: | SPIE |
| Additional Information: | The copyright for this article belongs to SPIE. |
| Keywords: | Continuous wave lasers; Fiber lasers; Fibers; Rare earths; Stimulated Raman scattering, Amplified spontaneous emission source; Distributed feedback; Distributed feedback fiber lasers; High spectral purity; Maximum output power; Raman fiber lasers; Rare-earth emission; Wavelength tunable fiber laser, Distributed feedback lasers |
| Department/Centre: | Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering |
| Date Deposited: | 12 Dec 2022 08:54 |
| Last Modified: | 12 Dec 2022 08:54 |
| URI: | https://eprints.iisc.ac.in/id/eprint/78293 |
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