Abstract
We have demonstrated simultaneous laser frequency stabilization of a UV and IR laser, to coupled transitions of ions in the same spectroscopic sample, by detecting only the absorption of the UV laser. Separate signals for locking the different lasers are obtained by modulating each laser at a different frequency and using lock-in detection of a single photodiode signal. Experimentally, we simultaneously lock a 369 nm and a 935 nm laser to the (2)S(1/2) → (2)(P(1/2) and (2)D(3/2) → (3)D([3/2]1/2) transitions, respectively, of Yb(+) ions generated in a hollow cathode discharge lamp. Stabilized lasers at these frequencies are required for cooling and trapping Yb(+) ions, used in quantum information and in high precision metrology experiments. This technique should be readily applicable to other ion and neutral atom systems requiring multiple stabilized lasers.
Highlights
Frequency stabilized lasers are an integral part of many atomic physics experiments
Streed et al [2] and Lee at al. [3] have demonstrated locking a UV diode laser to the 2S1/2 → 2P1/2 transition of Yb+ ions generated in a hollow cathode discharge lamp
We have presented a method for simultaneously locking both a UV and IR laser to coupled resonances in a single spectroscopic sample and applied the method for locking different lasers to the 2S1/2 →2P1/2 and 2D3/2 → 3D[3/2]1/2 transitions of 174Yb+
Summary
Frequency stabilized lasers are an integral part of many atomic physics experiments. in trapped ion or neutral atom experiments, the laser frequency must be stabilized to be within a fraction of the natural line width of an atomic transition for effective cooling and state manipulation [1]. Absorption of the 935 nm laser is further suppressed because, without optical pumping, only few ions in the electric discharge of our HCDL will be in the 2D3/2 state [9] These effects conspire to make observation of absorption of the 935 nm laser very challenging, precluding the use of conventional techniques like saturated absorption spectroscopy for stabilizing its frequency. In the model we use the same laser beam intensities as those used experimentally to obtain Fig. 3, and the following quantities were used as fitting parameters: the homogenous width of the 2D3/2 → 3D[3/2]1/2 transition (Γ2), the rate of non-radiative decay from 2D3/2 →2S1/2 (R31), and the rate of non-radiative population of the 2D3/2 from the ground state (R13), and the strong velocity collision rate (Rc). The model clearly explains the appearance of the double resonance signal in Fig. 3, it somewhat overestimates the depth of the central dip
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