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Using a temperature-tuned ppKTP crystal, a record 1.3 W single-frequency red laser at 661 nm is achieved from intra-cavity second-harmonic generation of a Nd:YLiF4 ring laser oscillating on the pi-polarized transition (lambda~1321 nm).
Using a type-I critically phase-matched bismuth borate crystal, a record 620 mW single-frequency red laser at 671 nm is achieved from intra-cavity SHG of a pi-polarized single-end pumped Nd:YVO4 ring laser oscillating on the lambda~1342 nm transition.
Single-frequency operation of diode-pumped Nd:YLiF4 and Nd:YVO4 continuous-wave (cw) ring lasers are investigated in the 1.31-1.34 mum range, together with their intracavity second-harmonic generation to the red spectral range (0.65-0.67 mum) using either BiB3O6 (BiBO), LiB3O5 (LBO) or periodically-poled KTiOPO4 (ppKTP). Smooth single-longitudinal mode wavelength tuning over Deltalambda~3-4 nm within...
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