Rubidium spectroscopy at 778–780 nm with a distributed feedback laser diode

✍ Scribed by S. Kraft; A. Deninger; C. Trück; J. Fortágh; F. Lison; C. Zimmermann

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 245 KB
• Volume: 2
• Category: Article
• ISSN: 1612-2011
• DOI: 10.1002/lapl.200410155

✦ Synopsis

We have performed high resolution spectroscopy of
rubidium with a single mode continuous wave distributed feedback
(DFB) laser diode. The saturation spectrum of the D~2~-line of
^85^Rb and ^87^Rb was recorded with a resolution close to
the natural line width. The emission frequency was actively
stabilized to Doppler-free transitions with a relative accuracy of
better than 7 parts in 10^9^ using commercially available servo
devices only. An output power of 80 mW was sufficient to allow for
two-photon spectroscopy of the 5S-5D-transition of ^87^Rb.
Further, we report on the spectral properties of the DFB diode,
its tuning range and its frequency modulation properties. The line
width of the diode laser, determined with high resolution Doppler
free two photon spectroscopy, was 4 MHz without applying any
active stabilization techniques. For time scales below 5 μs
the line width drops below 2 MHz.