Frequency Locking and Power Enhancement by Coherent Addition of a Clock Laser for a Portable Multi-⁴⁰Ca⁺ Optical Clock
Student Contest:
No
Affiliation Type:
Academia
Keywords:
portable clock, multiple ions, fast feedback, coherent addition
Abstract:
We construct a frequency locking system for a portable multi-ion optical clock and develop a clock laser whose power is enhanced by the coherent addition method. We reduce the feedback cycle time down to 50 ms, which realizes short-term stabilization with a compact optical reference cavity. To excite the clock transition at 729 nm of multiple ions, we perform coherent addition of 1458-nm optical amplifier outputs and obtain 100 mW at 729 nm by second-harmonic generation.
