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We describe the design and characterization of a versatile pulsed (5 ns, 10Hz repetition rate) optical parametric oscillator and amplifier system capableof generating single longitudinal mode, narrow linewidth (0.01 cm$^{-1}$)radiation in the wavelength range of 680 - 870 nm and 1380 - 4650 nm. Using acombination of power-normalized photoacoustic signal and a Fizeauinterferometer-based wavemeter, we are able to actively stabilize the outputwavenumber to within 0.005 cm$^{-1}$ (3$\sigma$) over a timescale longer than1000 seconds. We demonstrate an application of this system by performingro-vibration state-selected preparation of CO in v = 2 state, via directovertone excitation (v = 0 $\rightarrow 2$ at 2346 nm) and subsequentstate-selected detection in an internally cold molecular beam.

A versatile and narrow linewidth infra-red radiation source for ro-vibration state selected preparation of molecules in molecular beams