Laser-diode-excited laser apparatus, fiber laser apparatus, and fiber laser amplifier in which laser medium doped with one of Ho3+, Sm3+, Eu3+, Dy3+, Er3+, and Tb3+ is excited with GaN-based compound laser diode

摘要

A solid-state laser crystal constituting a laser-diode-excited solid-state laser apparatus or an optical fiber constituting a fiber laser apparatus or fiber laser amplifier is doped with one of Ho³⁺, Sm³⁺, Eu³⁺, Dy³⁺, Er³⁺, and Tb³⁺ so that a laser beam is emitted from the solid-state laser crystal or the optical fiber, or incident light of the fiber laser amplifier is amplified, by one of the transitions from ⁵S₂ to ⁵I₇, from ⁵S₂ to ⁵I₈, from ⁴G_5/2 to ⁶H_5/2, from ⁴G_5/2 to ⁶H_7/2, from ⁴F_3/2 to ⁶H_11/2, from ⁵D₀ to ⁷F₂, from ⁴F_9/2 to ⁶H_13/2, from ⁴F_9/2 to ⁶H_11/2, from ⁴S_3/2 to ⁴I_15/2, from ²H_9/2 to ⁴I_13/2, and from ⁵D₄ to ⁷F₅. The above solid-state laser-crystal or optical fiber is excited with a GaN-based compound laser diode.