ORCID Profile
0000-0002-0554-6999
Current Organisation
University of Adelaide
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Publisher: American Physical Society (APS)
Date: 11-07-2023
Publisher: Optica Publishing Group
Date: 16-12-2019
DOI: 10.1364/OL.45.000045
Abstract: Self-heterodyne fiber interferometers have been shown to be capable of stabilizing lasers to ultra-narrow linewidths and present an excellent alternative to high-finesse cavities for frequency stabilization. In addition to suppressing frequency noise, these devices are highly tunable and can be manipulated to produce high-speed frequency sweeps over the entire range of the laser. We present an analytic approach for choosing a delay-line length for both optimal noise suppression and highest in-loop frequency sweep rate. Based on this model, we stabilize an extended cavity diode laser to a fiber Michelson interferometer and demonstrate a linewidth of 700 Hz over millisecond timescales while also allowing for a frequency scan rate of 1 THz/s. We independently measure the maximum deviation from linearity of the sweep to be only 100 kHz.
Publisher: The Optical Society
Date: 29-02-2016
DOI: 10.1364/OL.41.001014
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2017
Publisher: Optica Publishing Group
Date: 23-07-2020
DOI: 10.1364/OL.394572
Abstract: We present a simple yet powerful technique to measure and stabilize the relative frequency noise between two lasers emitting at vastly different wavelengths. The noise of each laser is extracted simultaneously by a frequency discriminator built around an unstabilized Mach–Zehnder fiber interferometer. Our protocol ensures that the instability of the interferometer is canceled and yields a direct measure of the relative noise between the lasers. As a demonstration, we measure the noise of a 895 nm diode laser against a reference laser located hundreds of nm away at 1561 nm. We also demonstrate the ability to stabilize the two lasers with a control bandwidth of 100 kHz using a Red Pitaya and reach a sensitivity of 1 H z 2 / H z limited by detector noise. We independently verify the performance using a commercial frequency comb. This approach stands as a simple and cheap alternative to frequency combs to transport frequency stability across large spectral intervals or to characterize the noise of arbitrary color sources.
Publisher: IOP Publishing
Date: 03-2020
Abstract: We develop a method for extracting the physical parameters of interest for a conventional dipole-trapped cold atomic ensemble. This technique uses the spatially dependent ac-Stark shift of the trap itself to project the atomic distribution onto a light-shift broadened transmission spectrum. We develop a model that connects the atomic distribution with the expected transmission spectrum. We then demonstrate the utility of the technique by deriving the temperature, trap depth, lifetime, and trapped atom number from data that was taken in a single shot experimental measurement.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2016
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2017
Publisher: American Physical Society (APS)
Date: 25-06-2014
Publisher: IEEE
Date: 05-2014
Publisher: Optica Publishing Group
Date: 30-09-2021
DOI: 10.1364/OL.435219
Abstract: Frequency combs play a crucial supporting role for optical clocks by allowing coherent frequency ision of their output signals into the electronic domain. This task requires stabilization of the comb’s offset frequency and of an optical comb mode to the clock laser. However, the two actuators used to control these quantities often influence both degrees of freedom simultaneously. This non-orthogonality leads to artificial limits to the control bandwidth and unwanted noise in the comb. Here, we orthogonalize the two feedback loops with a linear combination of the measured signals in a field-programmable gate array. We demonstrate this idea using a fiber frequency comb stabilized to a clock laser at 259 THz, half the frequency of the 1 S 0 → 3 P 0 Yb transition. The decrease in coupling between the loops reduces the comb’s optical phase noise by 20 dB. This approach could improve the performance of any comb stabilized to any optical frequency standard.
No related grants have been discovered for Ashby Hilton.