UV-Diode-Pumped Green and Yellow Tb3+ Lasers

Trivalent terbium
$(\text{Tb}^{3+})$
has shown promise in recent years as an ion for green and yellow laser emission [1]. A major drawback impeding the application of
$\text{Tb}^{3+}$
for this purpose is its weak absorption under cyan-blue pumping around 486 nm [2]. This requires the use of very long laser crystals to achieve reasonable output powers and optical-to-optical efficiencies, which also restricts the mode-matching efficiency with low-brightness pump sources.