We report difference frequency measurements on the spectrum of helium by phase-locking two DBR diode lasers at 1.08 μm. A mirror terminated extended cavity is used for narrowing the laser linewidth to few hundred kHz. Phase-locking between two narrowed lasers is then achieved up frequency differences of 40 GHz. From the investigation of the 23P helium multiplet we extract a preliminary value for the 23P0 – 23P1 fine structure splitting with an accuracy of 25 kHz, corresponding to 9 parts in 107.
Frequency control of DBR diode lasers at 1.08 micrometer and precision spectroscopy of helium / M. Prevedelli;P. Cancio;G. Giusfredi;F.S. Pavone;M. Inguscio. - In: OPTICS COMMUNICATIONS. - ISSN 0030-4018. - STAMPA. - 125:(1996), pp. 231-236. [10.1016/0030-4018(96)00053-3]
Frequency control of DBR diode lasers at 1.08 micrometer and precision spectroscopy of helium
PREVEDELLI, MARCO;GIUSFREDI, GIOVANNI;PAVONE, FRANCESCO SAVERIO;INGUSCIO, MASSIMO
1996
Abstract
We report difference frequency measurements on the spectrum of helium by phase-locking two DBR diode lasers at 1.08 μm. A mirror terminated extended cavity is used for narrowing the laser linewidth to few hundred kHz. Phase-locking between two narrowed lasers is then achieved up frequency differences of 40 GHz. From the investigation of the 23P helium multiplet we extract a preliminary value for the 23P0 – 23P1 fine structure splitting with an accuracy of 25 kHz, corresponding to 9 parts in 107.
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