8 N ov 2 01 2 Rovibrational cooling of molecules by optical pumping

Sensitivity and resolution in frequency comb spectroscopy of buffer gas cooled polyatomic molecules

spectroscopy [1, 2]. While the use of combs as frequency references is now ubiquitous, they can also be directly employed for optical spectroscopy using techniques known as direct frequency comb spectroscopy [3]. By coupling frequency combs to high-finesse optical cavities, cavityenhanced direct frequency comb spectroscopy (CE-DFCS) combines broad spectral bandwidth, high spectral resolution, a...

ar X iv : a st ro - p h / 99 11 43 8 v 1 2 3 N ov 1 99 9 H 2 molecules and cold clouds in cooling flow clusters †

Deeply bound ultracold molecules in an optical lattice

We demonstrate efficient transfer of ultracold molecules into a deeply bound rovibrational level of the singlet ground state potential in the presence of an optical lattice. The overall molecule creation efficiency is 25%, and the transfer efficiency to the rovibrational level |v = 73, J = 2 > is above 80%. We find that the molecules in |v = 73, J = 2 > are trapped in the optical lattice, limit...

Implementation of a single femtosecond optical frequency comb for rovibrational cooling

We show that a single femtosecond optical frequency comb may be used to induce two-photon transitions between molecular vibrational levels to form ultracold molecules (e.g., KRb). The phase across an individual pulse in the pulse train is sinusoidally modulated with a carefully chosen modulation amplitude and frequency. Piecewise adiabatic population transfer is fulfilled to the final state by ...

Molecular vibrational cooling by Optical Pumping with shaped femtosecond pulses

Some of us have recently reported in Science [1] vibrational cooling of translationally cold Cs2 molecules into the lowest vibrational level v = 0 of the singlet XΣg ground electronic state. Starting from a sample of cold molecules produced in a collection of vibrational levels of the ground state, our method was based on repeated optical pumping by laser light with a spectrum broad enough to e...