Abstract
We present a simple, robust, narrow-linewidth, frequency-doubled semiconductor laser source suitable for laser cooling and repumping of \(^9\text {Be}^+\) ions. A distributed Bragg reflector (DBR) laser diode operating at 626 nm is self-injection-locked to a frequency doubling cavity via phase-stabilised optical feedback when the laser is resonant with the cavity mode. The short-term laser instability is reduced from the MHz level to approximately 20 kHz by the injection process, thus eliminating the need for a high-bandwidth feedback loop to suppress the otherwise troublesome high-frequency laser noise. Long-term stability of the laser frequency is achieved by feeding back to the length of the enhancement cavity utilising an electro-optic frequency comb generator to produce a beatnote with a laser that is detuned by 98 GHz. Long-term injection locking and frequency stabilisation via a wavemeter are ensured using automatic relocking algorithms. This work could find applications throughout the atomic physics community as a cost-effective alternative to expensive, intrinsically narrow-linewidth lasers where cavity-enhanced frequency doubling is required.
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Acknowledgements
The authors gratefully thank Uwe Sterr and Dirk Piester for generously loaning equipment to make this project possible, Helen Margolis for her advice regarding the EOM frequency comb, and thank Lennart Pelzer and Mariia Stepanova for their contributions to the experiment. SAK acknowledges support by the Alexander von Humboldt Foundation, and PT was supported by the IP@Leibniz programme of the Leibniz Universität Hannover. We acknowledge support from the Deutsche Forschungsgemeinschaft through SCHM2678/5-1.
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King, S.A., Leopold, T., Thekkeppatt, P. et al. A self-injection locked DBR laser for laser cooling of beryllium ions. Appl. Phys. B 124, 214 (2018). https://doi.org/10.1007/s00340-018-7080-0
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DOI: https://doi.org/10.1007/s00340-018-7080-0