Double-pass fiber Raman laser - A powerful and widely tunable in the ultraviolet, visible, and near-infrared fiber Raman laser for biomedical investigations
Ik. Ilev et al., Double-pass fiber Raman laser - A powerful and widely tunable in the ultraviolet, visible, and near-infrared fiber Raman laser for biomedical investigations, IEEE S T QU, 5(4), 1999, pp. 1013-1018
We present the operating principle, general features, and advantages of a n
ovel concept for the development of powerful and widely tunable fiber Raman
lasers (FRL's), based on the high-power pumping of large-core low-loss mul
timode fibers using a simple double-pass laser arrangement with Littrow-pri
sm-tuned emission. Basic experimental results obtained with various modific
ation double-pass FRL schemes, which provide the generation of both discret
ely tunable emission in the UV/blue (360-493 nm) at lambda(p) = 355 nm and
continuously tunable emission in the visible/near-IR (0.54-1.01 mu m) at la
mbda(p) = 532 nm, are reported. The double-pass FRL schemes permit powerful
and widely tunable spectral components to be generated, due to the double
passing of nonlinear-converted laser emission through the optical fiber, ma
ximum cavity feedback, the use of multimode fibers, and high-power pumping.