2018/05/25 by S. A. King, Steven A. King, Tobias Leopold +2
Physics and Astronomy · #Advanced Fiber Laser Technologies #Advanced Frequency and Time Standards #Cold Atom Physics and Bose-Einstein Condensates #Distributed Bragg reflector #Distributed feedback laser #Injection locking #Injection seeder #Laser #Laser linewidth #Laser power scaling #Materials science #Optics #Optoelectronics #Physics #Semiconductor laser theory #physics.atom-ph #physics.ins-det #physics.optics
paper · pdf · doi:10.1007/s00340-018-7080-0
8 pages, 8 figures
arxiv created 2018/05/25 · openalex publication_date 2018/10/19 · arxiv updated 2018/11/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present a simple, robust, narrow-linewidth, frequency-doubled semiconductor laser source suitable for laser cooling and repumping of 9Be+ 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.