Abstract
Coherent antiStokes Raman spectroscopy (CARS) is performed on nitrogen gas (N2) using the tunable signal wave from a pulsed optical parametric oscillator (OPO) based on β-barium borate (BBO). The continuously tunable output frequencies and optical bandwidth of this OPO are controlled by injection seeding at the idler wavelength with single-mode radiation from an external-cavity diode laser (ECDL). It is notable that the tunable BBO OPO ring cavity is passive (such that the cavity length is not locked to the seed frequency as it is scanned)1,2; this is achieved by slightly misaligning die cavity to reduce its effective finesse. Figure 1 plots the linear correlation between the 607-nm signal and 855-nm seed frequencies for an ECDL-seeded BBO OPO, pumped at 355 nm; there is no evidence of mode hops (which would occur in 1.8- GHz steps) throughout a scan of 30 GHz, although there are some minor scanning irregularities as shown in the inset portion of Fig. 1.
© 1996 Optical Society of America
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