CW Self-Frequency-Doubling Laser Operating on Nd: MgO: LiNbO3 High-Gain Polarization

The CW second-harmonic wave of high-gain polarization at λ=1.085 μm was demonstrated with Nd: MgO: LiNbO3 self-frequency-doubling laser cavity inserted with a quarter wave-plate of the fundamental wavelength. The pump power threshold for the second-harmonic generation as low as 9.9 mW was achieved. The maximum second-harmonic output was 11.4 mW, the conversion efficiency for the total second-harmonic output was 11.3% per Watt.