Sisyphus Laser Cooling of a Polyatomic Molecule

Abstract

We perform magnetically-assisted Sisyphus laser cooling of the triatomic free radical strontium monohydroxide (SrOH). This is achieved with principal optical cycling in the rotationally closed $P\left(N"=1\right)$ branch of either the ${\tilde{X}}^2{\Sigma }^{+}\left(000\right)\leftrightarrow {\tilde{A}}^2{\Pi }_{1/2}\left(000\right)$ or the ${\tilde{X}}^2{\Sigma }^{+}\left(000\right)\leftrightarrow {\tilde{B}}^2{\Sigma }^{+}\left(000\right)$ vibronic transitions. Molecules lost into the excited vibrational states during the cooling process are repumped back through the $\tilde{B}\left(000\right)$ state for both the $\left(100\right)$ level of the Sr-O stretching mode and the $\left(02^{0}0\right)$ level of the bending mode. The transverse temperature of a SrOH molecular beam is reduced in one dimension by two orders of magnitude to $\sim 700\mu \mathrm{K}$. This approach opens a path towards creating a variety of ultracold polyatomic molecules, including much larger ones, by means of direct laser cooling.

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