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Continuously linewidth tunable, polarisation maintaining narrow linewidth fiber laser

Vikram, BS and Choudhury, V and Prakash, R and Aparanji, S and Supradeepa, VR (2019) Continuously linewidth tunable, polarisation maintaining narrow linewidth fiber laser. In: Fiber Lasers XVI: Technology and Systems 2019, 4 - 7 February 2019, San Francisco.

Full text not available from this repository.
Official URL: https://doi.org/10.1117/12.2510431


High power polarised narrow linewidth sources are of immense importance in coherent beam combining (increased path length accuracy), spectral beam combining (reduced angular spread), non-linear frequency conversion (increased parametric gain) and remote detection. Power scaling of narrow linewidth sources is primarily limited by Stimulated Brillouin Scattering which can be overcome by spectral broadening before amplification to higher powers. Various applications have different requirements of spectral purity and power which can be met if the source line width is tunable. We demonstrate a narrow line width polarisation maintaining (PM) laser with continuous linewidth tuning from ∼2.88 GHz to ∼9.88 GHz with over 20 W of output power with a polarisation extinction ratio (PER) greater than 20 dB. We achieve continuous linewidth tuning through pure phase modulation of a 1064 nm DBR laser with a white noise source whose bandwidth and power are tuned with a low pass filter bank and variable attenuation of the drive voltage to the modulator. This dual control mechanism enables gapless tuning of the linewidth of the source. A cascade of optimized PM Yb-doped fiber preamplifier and power amplifier is used to scale the output power to over 20W. Combined with the wavelength tuning of the DBR seed, the tunable spectral width makes it versatile for use in a wide range of applications.

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: DBR lasers; Fiber lasers; Fibers; Linewidth; Low pass filters; Phase modulation; Polarization; Polarization-maintaining fiber; Power amplifiers; Single mode fibers; Stimulated Brillouin scattering; White noise, Coherent beam combining; Dual control mechanism; Narrow linewidth fiber laser; Noise source; Nonlinear frequency conversion; Spectral beam combining; Spectral broadening; Ytterbium Doped Fiber Amplifier, Fiber amplifiers
Department/Centre: Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 12 Dec 2022 08:51
Last Modified: 12 Dec 2022 08:51
URI: https://eprints.iisc.ac.in/id/eprint/78294

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