Abstract
This report presents a Raman laser system to drive atoms between the two hyperfine levels
of the ground state of 87Rb. Therefore two external cavity diode lasers are
placed in a phase lock loop (PLL). The lasers are tuned to emit light at a wavelength
of 780,241 nm and have a frequency di_erence of 6,834682 GHz, corresponding to
the atomic transition between the F=1 and F=2 levels of the 5S1=2 state of 87Rb.
Saturated absorption spectroscopy is used to successfully visualize the D2 lines of
Rubidium. One of the lasers is locked on an atomic transition by polarization spectroscopy.
The PLL is used to stabilize the relative frequency and phase between the
two lasers. The coherence of the system is tested in an electromagnetically induced
transparency experiment on Rubidium in a vapor cell. This shows some coherence,
but using the phase-feedback loop above the frequency-feedback loop, does not improve
the coherence of the system. The bandwidth of the PLL is too low to obtain
a stable phase lock.
Maureen Dinkgreve
6192882