ABSTRACT: We present a single mode intra-cavity spectroscopy system in which the test laser is locked to a narrow band external single
mode laser. This technique solves many problems typically encountered in single mode intra-cavity spectroscopy: it results
in good tuning properties, a stable single mode operation close to the lasing threshold, a high side-mode suppression and
a reduction of spontaneous emission without the use of any frequency selective element. Measurements of broadband absorptions
as well as measurements of a narrow band absorption line of the oxygen A-band are presented and compared with theoretical
model predictions. The prototype described in this work provides an enhancement in sensitivity of approximately a factor of
12, and it demonstrates the influence of optical injection to single mode intra-cavity spectroscopy. As there is no need for
any frequency selective element inside the cavity, the sensitivity can be massively enhanced by optimizing the laser cavity.
Applied Physics B 04/2012; 96(2):281-286. · 2.19 Impact Factor
ABSTRACT: We present spectrally resolved pump-probe experiments on the photoassociation of ultracold rubidium atoms with shaped ultrashort
laser pulses. The pump pulse causes a free-bound transition leading to a coherent transient signal of rubidium molecules in
the first excited state. In order to achieve a high frequency resolution the bandwidth of the pump pulse is reduced to a few
wavenumbers. The frequency dependence of the transient signal close to the D1 atomic resonance is investigated for characteristic
pump-probe delay times. The observed spectra, which show a pronounced dip for pump-probe coincidence, are interpreted using
quantum dynamical calculations.
The European Physical Journal D 04/2012; 54(3):711-714. · 1.48 Impact Factor
ABSTRACT: We demonstrate the photoassociation of ultracold rubidium dimers using coherent femtosecond pulses. Starting from a cloud of ultracold rubidium atoms, electronically excited rubidium molecules are formed with shaped photoassociation pump pulses. The excited state molecules are projected with a time-delayed probe pulse onto molecular ion states which are detected in a mass spectrometer. Coherent transient oscillations of the excited state population are observed in the wings of the pump pulse, in agreement with the time-dependent solution of the Schrödinger equation of the excitation process.
Physical Review Letters 06/2008; 100(23):233003. · 7.37 Impact Factor
Physical Review A 01/2007; 76:063404. · 2.88 Impact Factor