We present a synchronously pumped fiber optical parametric oscillator for coherent anti-Stokes Raman scattering microscopy. Pulses from a 1 μm Yb-doped fiber laser are amplified and frequency converted to 779–808 nm through normal dispersion four-wave mixing in a photonic crystal fiber. The idler frequency is resonant in the oscillator cavity, and we find that bandpass filtering the feedback is essential for stable, narrow-bandwidth output. Experimental results agree quite well with numerical simulations of the device. Transform-limited 2 ps pulses with energy up to 4 nJ can be generated at the signal wavelength. The average power is 180 mW, and the relative-intensity noise is much lower than that of a similar parametric amplifier. High-quality coherent Raman images of mouse tissues recorded with this source are presented.
© 2013 Optical Society of America
Original Manuscript: July 9, 2013
Revised Manuscript: August 23, 2013
Manuscript Accepted: September 9, 2013
Published: October 10, 2013
Erin S. Lamb, Simon Lefrancois, Minbiao Ji, William J. Wadsworth, X. Sunney Xie, and Frank W. Wise, "Fiber optical parametric oscillator for coherent anti-Stokes Raman scattering microscopy," Opt. Lett. 38, 4154-4157 (2013)