3 research outputs found
High-frequency broadband laser phase noise cancellation using a delay line
Laser phase noise remains a limiting factor in many experimental settings,
including metrology, time-keeping, as well as quantum optics. Hitherto this
issue was addressed at low frequencies, ranging from well below 1 Hz to
maximally 100 kHz. However, a wide range of experiments, such as, e.g., those
involving nanomechanical membrane resonators, are highly sensitive to noise at
higher frequencies in the range of 100 kHz to 10 MHz, such as nanomechanical
membrane resonators. Here we employ a fiber-loop delay line interferometer
optimized to cancel laser phase noise at frequencies around 1.5 MHz. We achieve
noise reduction in 300 kHz-wide bands with a peak reduction of more than 10 dB
at desired frequencies, reaching phase noise of less than -160 dB (rad/Hz)
with a Ti:AlO laser. These results provide a convenient noise reduction
technique to achieve deep ground-state cooling of mechanical motion.Comment: 12 pages, 6 figure
Frequency Noise Suppression of a Single Mode Laser with an Unbalanced Fiber Interferometer for Subnanometer Interferometry
We present a method of noise suppression of laser diodes by an unbalanced Michelson fiber interferometer. The unstabilized laser source is represented by compact planar waveguide external cavity laser module, ORIONTM (Redfern Integrated Optics, Inc.), working at 1540.57 nm with a 1.5-kHz linewidth. We built up the unbalanced Michelson interferometer with a 2.09 km-long arm based on the standard telecommunication single-mode fiber (SMF-28) spool to suppress the frequency noise by the servo-loop control by 20 dB to 40 dB within the Fourier frequency range, remaining the tuning range of the laser frequency
Frequency Noise Suppression of a Single Mode Laser with an Unbalanced Fiber Interferometer for Subnanometer Interferometry
We present a method of noise suppression of laser diodes by an unbalanced Michelson fiber interferometer. The unstabilized laser source is represented by compact planar waveguide external cavity laser module, ORIONTM (Redfern Integrated Optics, Inc.), working at 1540.57 nm with a 1.5-kHz linewidth. We built up the unbalanced Michelson interferometer with a 2.09 km-long arm based on the standard telecommunication single-mode fiber (SMF-28) spool to suppress the frequency noise by the servo-loop control by 20 dB to 40 dB within the Fourier frequency range, remaining the tuning range of the laser frequency