We have demonstrated a 0.7 μm – 1.9 μm wavelength-tunable light source based on a single-pass optical parametric amplification (OPA) in a multiperiod magnesium oxide-doped periodically poled lithium niobate crystal. The OPA pump was a frequency-doubled ultrafast ytterbium-doped fiber oscillator, and the residual 1040 nm laser power after frequency doubling was recycled to generate a supercontinuum seeding source. Compared with conventional OPAs, this system is free from timing jitter between the pump laser and the seeding source. Over 50% conversion efficiency was obtained with 10 nJ pump energy. Combined with a 50 MHz repetition rate, this versatile source is ideal for biomedical and spectroscopic applications.
Tzeng, Y. W., Lin, Y. Y., Huang, C. H., Liu, J. M., Chui, H. C., Liu, H. L., Stone, J. M., Knight, J. C., & Chu, S. W. (2009). Broadband tunable optical parametric amplification from a single 50 MHz ultrafast fiber laser. Optics Express, 17(9), 7304-7309. https://doi.org/10.1364/OE.17.007304