We report optimization of a stretched-pulse erbium-doped fiber laser for second-harmonic generation and the evaluation of several nonlinear crystals for this application. With compressed fundamental pulse energies of 2.7 nJ at 31.8 MHz, we achieved 10% conversion efficiency and 86-fs, 771-nm pulses with energies of 270 pJ. Frequency-resolved optical gating was used to analyze both the fundamental and the frequencydoubled pulses.
© 1996 Optical Society of America
L. E. Nelson, S. B. Fleischer, G. Lenz, and E. P. Ippen, "Efficient frequency doubling of a femtosecond fiber laser," Opt. Lett. 21, 1759-1761 (1996)