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Cascaded Raman fiber lasers (CRFLs) pumped by wavelength-tunable Ytterbium-doped fiber laser (YDFL) can generate multi-watt level output powers in the near-infrared (NIR) wavelength range. Output from such a CRFL can be frequency-doubled using Second harmonic generation (SHG) to generate power in the visible region, from green to red and beyond. The advantage of generating power in visible in this process is that as the NIR pump is widely wavelength tunable, the generated visible power will also be widely wavelength tunable with CW output.
Figure 1: Schematic of generating power in any wavelength from UV-A to NIR region using tunable Cascaded Raman fiber lasers and subsequent nonlinear conversions.
Sum frequency generation (SHG) of the undepleted NIR power with the frequency-doubled visible power can extend the output further from UV-A to green.
References:
Y. Feng, S. Huang, A. Shirakawa, and K. Ueda, "Multiple-color cw visible lasers by frequency sum-mixing in a cascading Raman fiber laser," Opt. Express, OE 12(9), 1843–1847 (2004).
E. I. Dontsova, S. I. Kablukov, I. D. Vatnik, and S. A. Babin, "Frequency doubling of Raman fiber lasers with random distributed feedback," Opt. Lett. 41(7), 1439 (2016).
H. Wu, W. Wang, B. Hu, Y. Li, K. Tian, R. Ma, C. Li, J. Liu, J. Yao, and H. Liang, "Widely tunable continuous-wave visible and mid-infrared light generation based on a dual-wavelength switchable and tunable random Raman fiber laser," Photon. Res., PRJ 11(5), 808–816 (2023).
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