Abstract
Dual-wavelength and tri-wavelength operation of solid-state lasers has been attracting a great deal of attention, due to the need for such sources in applications like coherent terahertz generation [1]. Multicolor laser operation has been shown in many solid-state laser gain media including Nd:YAG, Yb:KGW, Tm:YAP, Cr:LiSAF, Alexandrite, Tm:CaYAlO4, and Ti:Sapphire. Most of the earlier studies report dual/triple wavelength operation in a few pairs of lines. Furthermore, the ratio of the power in each line varies with external factors such as pump power, and could not be controlled easily. These disadvantages are due to the method used for frequency selection, where operating in a multi-wavelength regime requires specially coated cavity optics and/or coupled cavities, which can usually be optimized for a single transition pair at a fixed output coupling and pump power.
© 2017 IEEE
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