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Optics Communications

Stabilization of the 397nm and 866nm external cavity diode lasers for cooling a single calcium ion

Hua Guan, Bin Guo, Guilong Huang, Hualin Shu, Xue-Ren Huang, Kelin Gao

Published Mar 6, 2007• 14 citations
Publisher
DOI
10.1016/j.optcom.2007.02.018

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Construction and Testing of a Low-Finesse Fabry-Perot Interferometer For Use in Atomic Spectroscopy

Nathan C. Moody

I built a low-finesse confocal cavity with aluminum mirrors for use in the imaging of ultra-cold calcium ion plasmas. The confocal cavity provides stability at large mirror separations, a condition necessary for achieving both low finesse and narrow peak widths. Additionally, the finesse in the case of coherent input is effectively doubled compared to multi-mode resonance. The cavity was tested using a GaN diode laser input at 397nm. The transmission obtained indicated that the finesse of the cavity was slightly lower than the prediction based on measurements of the mirror reflectivities and the assumption of incoherent input.

•Jan 1, 2002•0 citations
We have fabricated an rf ion trap and laser-cooling light sources to observe shelving transition in a single calcium ion. All the radiation required for laser cooling and observation of the transition can be prepared with diode lasers in this system. Continuous-wave radiation at 397 nm for laser cooling was generated by frequency doubling of a GaAlAs laser in an external enhancement cavity. As a preliminary experiment for observing the shelving transition, laser cooling of one hundred calcium ions was demonstrated using this radiation and another diode laser.
An absolutely stabilized laser diode system for high-resolution spectroscopy of the 4 2 S 1/2 –3 2 D 5/2 electric-quadrupole-allowed transition in calcium ions at 729 nm is developed. Both its short-term and long-term stabilities are examined. A system for laser cooling of single calcium ions using an ultraviolet laser diode for excitation of the 4 2 S 1/2 –4 2 P 1/2 transition is also constructed, and by using it we have observed quantum jumps of single calcium ions with a high stability and a high signal-to-background ratio.
I built a low-finesse confocal cavity with aluminum mirrors for use in the imaging of ultra-cold calcium ion plasmas. The confocal cavity provides stability at large mirror separations, a condition necessary for achieving both low finesse and narrow peak widths. Additionally, the finesse in the case of coherent input is effectively doubled compared to multi-mode resonance. The cavity was tested using a GaN diode laser input at 397nm. The transmission obtained indicated that the finesse of the cavity was slightly lower than the prediction based on measurements of the mirror reflectivities and the assumption of incoherent input.