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arXiv · 2305.19792

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

Avinash Kumar·Saurabh Kumar Singh·Pranav R. Shirhatti
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Abstract

We describe the design and characterization of a versatile pulsed (5 ns, 10 Hz repetition rate) optical parametric oscillator and amplifier system capable of generating single longitudinal mode, narrow linewidth (0.01 cm$^{-1}$) radiation in the wavelength range of 680 - 870 nm and 1380 - 4650 nm. Using a combination of power-normalized photoacoustic signal and a Fizeau interferometer-based wavemeter, we are able to actively stabilize the output wavenumber to within 0.005 cm$^{-1}$ (3$\sigma$) over a timescale longer than 1000 seconds. We demonstrate an application of this system by performing ro-vibration state-selected preparation of CO in v = 2 state, via direct overtone excitation (v = 0 $\rightarrow 2$ at 2346 nm) and subsequent state-selected detection in an internally cold molecular beam.

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Avinash Kumar, Saurabh Kumar Singh, Pranav R. Shirhatti. 2023-05-31. A versatile and narrow linewidth infra-red radiation source for ro-vibration state selected preparation of molecules in molecular beams. https://doi.org/10.1063/5.0157912

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