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arXiv · 1805.10162

A self-injection locked DBR laser for laser cooling of beryllium ions

Steven A. King·Tobias Leopold·Premjith Thekkeppatt·Piet O. Schmidt
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Abstract

We present a simple, robust, narrow-linewidth, frequency-doubled semiconductor laser source suitable for laser cooling and repumping of $^9$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.

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Steven A. King, Tobias Leopold, Premjith Thekkeppatt, Piet O. Schmidt. 2018-05-25. A self-injection locked DBR laser for laser cooling of beryllium ions. https://doi.org/10.1007/s00340-018-7080-0

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