Phase transfer between three visible lasers for coherent population trapping

Abstract

Stringent conditions on the phase relation of multiple photons are a prerequisite for novel protocols of high-resolution coherent spectroscopy. In a recent experiment we have implemented an interrogation process of a Ca${}^{+}$-ion cloud based on three-photon coherent population trapping, with the potential to serve as a frequency reference in the THz-range. This high-resolution interrogation has been made possible by phase-locking both laser sources for cooling and repumping of the trapped ions to a clock laser at 729~nm by means of an optical frequency comb. The clock laser, a titanium-sapphire laser built in our lab locked onto two high-finesse cavities reaches a linewidth of a few Hertz and a frequency stability below 10${}^{-14}$ at one second, performances which can be copied onto the two other sources. In this paper we discuss the performances of the phase-transfer between the three involved lasers via the optical frequency comb.

References in corpus (13)

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Cited by in corpus (3)

• Experimental Demonstration of a Terahertz Frequency Reference based on Coherent Population Trapping
• Optical frequency analysis on dark state of a single trapped ion
• Laser interferometry based on atomic coherence