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Multiple-color cw visible lasers by frequency sum-mixing in a cascading Raman fiber laser

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Abstract

Multiple cw visible lasers at wavelengths ranging from 550nm to 625nm were generated by intracavity frequency sum-mixing of a cascading Raman fiber laser in a type-I noncritically phase-matched lithium triborate crystal. The phase matching conditions for individual wavelengths were realized by tuning the temperature of the lithium triborate crystal.

©2004 Optical Society of America

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Figures (3)

Fig. 1
Fig. 1 Schematic of the experimental setup. Cavity is formed by FBG, M1. M2 is a dichroic mirror through which visible lights escape from the cavity. Inset is a picture of dispersed visible emission (from left to right, 569nm, 589nm, and 606.5nm) when temperature is tuned to near 30°C, where all frequency sum-mixing channels are off the phase-match condition so that the intensities of these emissions were comparable.
Fig. 2
Fig. 2 (left) The emission spectra at the near-infrared wavelength range at pump power of 5.6W and 11W, respectively. (right) typical emission spectra at visible wavelength range when the temperature of LBO crystal was tuned to 70°C (dash line), 40°C (solid line), and 20°C (dot line), which correspond to phase matching condition for 569nm, 589nm and 606.5nm generation, respectively.
Fig. 3.
Fig. 3. The output power at 569nm, 589nm, and 606.5nm as a function of the pump power.

Tables (1)

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Table 1 Calculated phase matching temperature and effective nonlinear coefficient for all frequency sum-mixing channels

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