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Demonstration of input wavelength flexible cascaded Raman resonators based on the inclusion of a broadband distributed feedback reflector

Prakash, R and Balaswamy, V and Choudhury, V and Lakshmi, CG and Supradeepa, VR (2019) Demonstration of input wavelength flexible cascaded Raman resonators based on the inclusion of a broadband distributed feedback reflector. In: Nonlinear Frequency Generation and Conversion: Materials and Devices XVIII 2019, 5 - 7 February 2019, San Francisco.

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Official URL: https://doi.org/10.1117/12.2509759


Cascaded Raman fiber lasers are agile and scalable offering high optical powers at various wavelength bands inaccessible with rare-earth doped fiber lasers. Although several architectures for building cascaded Raman lasers exist, only the use of cascaded Raman resonators (CRRs) provide a high degree of power-independent wavelength conversion. A cascaded Raman resonator comprises of nested cavities built with two sets of high reflectivity fiber Bragg gratings at fixed Stokes wavelengths and thus can be used only for a fixed input wavelength; thereby restricting its use to a specific Ytterbium-doped fiber laser. The need for fabricating separate grating sets for each input wavelength compromises the simplicity and cost-effectiveness of this technique. Here, we demonstrate through experiment and simulations that the simple inclusion of a distributed broadband reflector at the first-order Stokes component along with the grating sets makes the CRR module very flexible to the input wavelengths, with remarkable improvement in efficiency over a widerange of inputs. In our experiment, a 17W Ytterbium-doped fiber laser tunable from 1055nm to 1080nm is used to pump a CRR module designed for an input wavelength of 1117nm and output wavelength of 1480nm. In conventional operation, for a non-resonant pump input into the CRR, nearly all the output was still unconverted pump. However, with the addition of the broadband distributed feedback reflector for the first-order Stokes component we achieved the 6thorder Stokes at 1480nm over the entire tuning range with a significant improvement in conversion ranging from ∼33% to 86% of output at 1480nm.

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: Cost effectiveness; Fiber Bragg gratings; Fiber lasers; Fibers; Four wave mixing; Mixer circuits; Optical communication; Optical fiber communication; Pumping (laser); Rare earth-doped fibers; Rare earths; Reflection; Resonators; Ytterbium, Broadband reflector; Distributed feedback; Frequency combs; Nonlinear Fiber-Optics; Output wavelengths; Raman fiber lasers; Stokes wavelength; Ytterbium-doped fiber lasers, Erbium doped fiber amplifiers
Department/Centre: Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 22 Nov 2022 09:19
Last Modified: 22 Nov 2022 09:19
URI: https://eprints.iisc.ac.in/id/eprint/77954

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