Injection locking of two frequency-doubled lasers with 3.2 GHz offset for driving Raman transitions with low photon scattering in ${}^{43}$Ca${}^{+}$

Abstract

We describe the injection locking of two infrared (794 nm) laser diodes which are each part of a frequency-doubled laser system. An acousto-optic modulator (AOM) in the injection path gives an offset of 1.6 GHz between the lasers for driving Raman transitions between states in the hyperfine split (by 3.2 GHz) ground level of ${}^{43}$Ca${}^{+}$. The offset can be disabled for use in ${}^{40}$Ca${}^{+}$. We measure the relative linewidth of the frequency-doubled beams to be 42 mHz in an optical heterodyne measurement. The use of both injection locking and frequency doubling combines spectral purity with high optical power. Our scheme is applicable for providing Raman beams across other ion species and neutral atoms where coherent optical manipulation is required.

3 pages, 3 figures

References in corpus (7)

• Randomized Benchmarking of Quantum Gates
• Errors in trapped-ion quantum gates due to spontaneous photon scattering
• Experimental quantum information processing with 43Ca+ ions
• Deterministic entanglement and tomography of ion spin qubits
• A microfabricated ion trap with integrated microwave circuitry
• A long-lived memory qubit on a low-decoherence quantum bus
• Injection-locking of violet laser diodes with a 3.2GHz offset frequency for driving Raman transitions in 43Ca+

Cited by in corpus (3)

• High-fidelity quantum logic gates using trapped-ion hyperfine qubits
• High-fidelity two-qubit quantum logic gates using trapped calcium-43 ions
• Optical injection and spectral filtering of high-power UV laser diodes