Q-switched lasing as a result of the 4F3/2→4I13/2 transition in a YAG:Nd3+ crystal and second harmonic generation in LiNbO3

Comparative calculations are made on the subject of lasing due to the ⁴F_3/2–⁴I_13/2 and ⁴F_3/2–⁴I_11/2 transitions in a YAG:Nd³⁺ crystal in the Q-switching regime. Characteristics of extracavity and intracavity generation of the second harmonic of the fundamental-frequency radiation of wavelength 1.318 μ in a lithium niobate crystal are considered. An extracavity conversion frequency of ~48% is reported. Recommendations are given on the construction of a YAG:Nd³⁺ laser utilizing the ⁴F_3/2–⁴I_13/2 transition.