Abstract
Acentric phosphate KGd(PO 3) 4 crystal is a new candidate for self-frequency-doubling laser host material. A large single crystal of KGd 0.95Nd 0.05(PO 3) 4 has been successfully grown by the top seeded growth method from a high-temperature self-flux melt. Morphology of the as-grown crystal has been discussed and crystal cleavage has been observed. Optical absorption spectrum of the crystal has been measured, and the results showed that KGd 0.95Nd 0.05(PO 3) 4 crystal would be very suitable to be pumped by laser diode and especially its self-absorption for the second harmonic of the incident 1064 nm laser was weakened remarkably compared with KNd(PO 3) 4 crystal with the same acentric structure. The experiment for second harmonic generation (SHG) also confirmed that the SHG efficiency of KGd 0.95Nd 0.05(PO 3) 4 had been hardly influenced by the self-absorption of Nd 3+ for low concentration.
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