Absolute frequency references at 1529 and 1560  nm using modulation transfer spectroscopy

Escobar, Y. N. Martinez de; Palacios, Silvana; Coop, Simon; Vanderbruggen, Thomas; Kaczmarek, Krzysztof T.; Mitchell, Morgan W.

doi:10.1364/ol.40.004731

Cited by 22 publications

(17 citation statements)

References 36 publications

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“…The output at 780 nm has a maximum power of 170 mW and Voigt linewidth of about 4.75(6) kHz 7 . The master laser is locked 80 MHz to the blue side of the F F 2 3 = ñ  ¢ = ñ | | cooling transition (see figure 2) using modulation transfer spectroscopy [31]. The cooling and repumper lasers ('slave lasers') are extended-cavity diode lasers (Toptica) which are offset locked to the master laser using an optical phase-locked loop, as described in [32], where the ultrafast photodiode is a PIN receiver (PT10GC, Bookham) and the digital phase-frequencydiscriminator chip is an ADF4110 (Analog Devices) in the case of the cooler and an ADF41020 for the repumper.…”

Section: Apparatus and State Preparationmentioning

confidence: 99%

Multi-second magnetic coherence in a single domain spinor Bose–Einstein condensate

et al. 2018

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We describe a compact, robust and versatile system for studying the macroscopic spin dynamics in a spinor Bose-Einstein condensate. Condensates of Rb 87 are produced by all-optical evaporation in a 1560 nm optical dipole trap, using a non-standard loading sequence that employs an ancillary 1529 nm beam for partial compensation of the strong differential light-shift induced by the dipole trap itself. We use near-resonant Faraday rotation probing to non-destructively track the condensate magnetization, and demonstrate few-Larmor-cycle tracking with no detectable degradation of the spin polarization. In the ferromagnetic F=1 ground state, we observe the spin orientation between atoms in the condensate is preserved, such that they precess all together like one large spin in the presence of a magnetic field. We characterize this dynamics in terms of the single-shot magnetic coherence times 1  and 2 *  , and observe them to be of several seconds, limited only by the residence time of the atoms in the trap. At the densities used, this residence is restricted only by one-body losses set by the vacuum conditions.

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Section: Apparatus and State Preparationmentioning

confidence: 99%

Multi-second magnetic coherence in a single domain spinor Bose–Einstein condensate

et al. 2018

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“…The shaded areas mark the uncertainty of the theoretical prediction due to uncertainties in the determination of Γ ef f . Figure 5 [11, 14-16, 21, 22] and AOMs [7,23].…”

Section: Modulation Parametersmentioning

confidence: 99%

Optimization strategies for modulation transfer spectroscopy applied to laser stabilization

Preuschoff¹,

Schlosser²,

Birkl³

2018

Opt. Express

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We present a general analysis for determining the optimal modulation parameters for the modulation transfer spectroscopy scheme. The results are universally valid and can be applied to spectroscopy of any atomic species requiring only the knowledge of the effective linewidth Γeff. A signal with optimized slope and amplitude is predicted for a large modulation index M and a modulation frequency comparable to the natural linewidth of the spectroscopic transition. As a result of competing practical considerations, a modulation index in the range of 3 ≤ M ≤ 10 has been identified as optimal. This parameter regime is experimentally accessible with a setup based on an acousto-optic modulator. An optimized signal for spectroscopy of the rubidium D2 line is presented. The signal shape and the dependence on the modulation parameters are in very good agreement with the theoretical description given. An experimental procedure for achieving a strong suppression of residual amplitude modulation is presented. Based on the optimized signal, we demonstrate long-term laser stabilization resulting in a laser linewidth of 150 kHz (16 s average) and a frequency stability of 18 kHz (rms) over 15 hours.

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“…Recently, stabilization of a telecom laser at 1560 nm was demonstrated using a photonic chip frequency doubler by using the second harmonic generated at 780 nm to probe the rubidium D2 transition. [ 27 ] Additionally, stabilization of a laser at 1529 nm to an excited state transition in rubidium was also demonstrated, [ 28,29 ] though in general, the number of telecom reference transitions available in atomic species is limited due to their simple electronic structure.…”

Section: Introductionmentioning

confidence: 99%

A Chip‐Scale Optical Frequency Reference for the Telecommunication Band Based on Acetylene

Zektzer

Hummon

Stern

et al. 2020

Laser & Photonics Reviews

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Lasers precisely stabilized to known transitions between energy levels in simple, well‐isolated quantum systems such as atoms and molecules are essential for a plethora of applications in metrology and optical communications. The implementation of such spectroscopic systems in a chip‐scale format would allow to reduce cost dramatically and would open up new opportunities in both photonically integrated platforms and free‐space applications such as lidar. Here the design, fabrication, and experimental characterization of a molecular cladded waveguide platform based on the integration of serpentine nanoscale photonic waveguides with a miniaturized acetylene chamber is presented. The goal of this platform is to enable cost‐effective, miniaturized, and low power optical frequency references in the telecommunications C band. Finally, this platform is used to stabilize a 1.5 µm laser with a precision better than 400 kHz at 34 s. The molecular cladded waveguide platform introduced here could be integrated with components such as on‐chip modulators, detectors, and other devices to form a complete on‐chip laser stabilization system.

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Absolute frequency references at 1529 and 1560 nm using modulation transfer spectroscopy

Cited by 22 publications

References 36 publications

Multi-second magnetic coherence in a single domain spinor Bose–Einstein condensate

Multi-second magnetic coherence in a single domain spinor Bose–Einstein condensate

Optimization strategies for modulation transfer spectroscopy applied to laser stabilization

A Chip‐Scale Optical Frequency Reference for the Telecommunication Band Based on Acetylene

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