An efficient, widely tunable, narrow-bandwidth, green-pumped, noncritical phase-matched lithium triborate based optical parametric oscillator (OPO) is applied to coherent anti-Stokes Raman scattering (CARS) spectroscopy and microscopy. The tunable signal beam (740–930 nm) of the OPO is combined with the fundamental of a Nd:YVO4 pump laser (1064 nm, 15 ps) to obtain high resolution vibrational spectra of molecules around the CH vibrational stretch (2700–3100 cm−1). The straightforward and convenient tunability of the OPO is demonstrated by CARS microscopy for the identification of different polymer microparticles on the same substrate.
Jurna, M., Korterik, J. P., Offerhaus, H. L., & Otto, C. (2006). Noncritical phase-matched lithium triborate optical parametric oscillator for high resolution coherent anti-stokes Raman scattering spectroscopy and microscopy. Applied physics letters, 89(25), 251116/1-6. https://doi.org/10.1063/1.2420773