Precision spectroscopy using a partially stabilized frequency comb

Lyon, Mary; Bergeson, Scott

doi:10.1364/ao.53.005163

Cited by 13 publications

(16 citation statements)

References 31 publications

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“…The 1-Hz variation in the repetition rate contributes only 30 kHz of variability in this laser frequency interval. However, as we have shown previously [30], even this variation is dramatically suppressed when all of the counters are read simultaneously, as we do in our experiment. The benefit of operating the comb in this partially-stabilized way is that the comb runs reliably without intervention all day long.…”

Section: Frequency Comb Errorssupporting

confidence: 81%

“…In this "partially-stabilized" configuration [30], we find that the uncontrolled repetition rate varies by approximately 1 Hz in repeated 1-second measurements. This level of variation is negligible in our experiment because the largest frequency interval that we measure is between the Rb D2 transition at 780 nm and Cs D2 transition at 852 nm, corresponding to 30,000 GHz or 30,000 comb modes.…”

Section: Frequency Comb Errorsmentioning

confidence: 78%

“…1 [30]. The frequency comb is generated by a femtosecond laser oscillator (Laser Quantum Gigajet) with a repetition rate f rep ≈ 984 MHz.…”

Section: The Laser Systemmentioning

confidence: 99%

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Measurement of the Yb IS01−P11transition frequency at 399 nm using an optical frequency comb

2016

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We determine the frequency of the Yb I 1 S0 − 1 P1 transition at 399 nm using an optical frequency comb. Although this transition was measured previously using an optical transfer cavity [D. Das et al., Phys. Rev. A 72, 032506 (2005)], recent work has uncovered significant errors in that method. We compare our result of 751 526 533.49 ± 0.33 MHz for the Yb-174 isotope with those from the literature and discuss observed differences. We verify the correctness of our method by measuring the frequencies of well-known transitions in Rb and Cs, and by demonstrating proper control of systematic errors in both laser metrology and atomic spectroscopy. We also demonstrate the effect of quantum interference due to hyperfine structure in a divalent atomic system and present isotope shift measurements for all stable isotopes.

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Section: Frequency Comb Errorssupporting

confidence: 81%

Section: Frequency Comb Errorsmentioning

confidence: 78%

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Measurement of the Yb IS01−P11transition frequency at 399 nm using an optical frequency comb

2016

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“…Applications range from quantum optics, cold atomic physics and off-resonant light-atom interfaces [1][2][3][4][5], through frequency comb stabilization [6][7][8][9] to precision spectroscopy and sensing [10,11].…”

Section: Introductionmentioning

confidence: 99%

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mentioning

confidence: 99%

Optical frequency locked loop for long-term stabilization of broad-line DFB laser frequency difference

2017

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In multiple applications, phase coherence of the two laser fields locked at a frequency offset is not required [2][3][4][5][6][7][8][9][10][11] and a mere frequency lock is a sufficient solution. Nevertheless, one of the most commonly used solutions is the optical phase locked loop (OPLL) [12][13][14][15]. In a generic OPLL the master laser (ML) and the slave laser (SL) are combined and the beat note is measured on a fast photodiode (PD), compared with a reference value and then the difference is fed through the loop filter and used to tune SL by employing a fast current modulator. However, phase difference has to be kept within tight margins for OPLLs to work, rendering them impractical for broad-line lasers.If the OPLL is constructed to ensure only the frequency drift stabilization and not the phase coherence, it constitutes an optical frequency locked loop (OFLL). Such approach has been presented previously in Ref.[16]; however, it was applied to narrow-line external cavity diodes lasers (ECDL) and was based on a frequency voltage converter, allowing only up to 8 MHz offsets between SL and ML. OPLL setups involving phase-frequency detectors (PFD) have been presented in Refs. [17] or [18] but for frequency offsets only up to 7 GHz. Both works were concerned with phase coherence requiring complicated loop filters and either field programmable gate array (FPGA) implementation or two parallel proportional-integral (PI) controllers. Ivanov et. al. [18] apply their setup to DFB lasers albeit of narrower line (1 MHz) than in our case. They also present a detailed analysis of OPLL performance in the presence of frequency dividers.Here we present an OFLL designed for the stabilization of the long-term (>100 μs) frequency drift. Our setup is based on an integrated PFD chip that compares the beat note signal of ML and SL with low-frequency reference. The PD and PFD are specifically matched to provide the simplicity of setup construction and usage. AbstractWe present an experimental realization of the optical frequency locked loop applied to long-term frequency difference stabilization of broad-line DFB lasers along with a new independent method to characterize relative phase fluctuations of two lasers. The presented design is based on a fast photodiode matched with an integrated phase-frequency detector chip. The locking setup is digitally tunable in real time, insensitive to environmental perturbations and compatible with commercially available laser current control modules. We present a simple model and a quick method to optimize the loop for a given hardware relying exclusively on simple measurements in time domain.Step response of the system as well as phase characteristics closely agree with the theoretical model. Finally, frequency stabilization for offsets within 4-15 GHz working range achieving <0.1 Hz long-term stability of the beat note frequency for 500 s averaging time period is demonstrated. For these measurements we employ an I/Q mixer that allows us to precisely and independently measure the full phase tr...

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Towards Stronger Coulomb Coupling in an Ultracold Neutral Plasma

Lyon

Bergeson

2015

Contrib. Plasma Phys.

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Ultracold neutral plasmas are strongly coupled Coulomb systems that are generated by photoionizing lasercooled atoms close to the ionization threshold. The strong coupling parameter Γ is limited at times later than ∼100 ns by disorder-induced heating. A recent simulation predicted that higher values of Γ can be realized in ultracold neutral plasmas if the plasma ions are excited to higher ionization states. In this paper we present recent results from an experiment that increases the strong coupling of an ultracold neutral plasma by promoting the plasma ions to the second ionization state. Using laser-induced fluorescence we map out the ion velocity distribution of the Ca + ions in a partially doubly ionized plasma and show that the heating due to the second ionization depends on the timing of the second ionization laser pulses. We compare our results to MD simulations, which estimate that Γ increases from approximately 2.5 to 3.6.

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Precision spectroscopy using a partially stabilized frequency comb

Cited by 13 publications

References 31 publications

Measurement of the Yb IS01−P11transition frequency at 399 nm using an optical frequency comb

Measurement of the Yb IS01−P11transition frequency at 399 nm using an optical frequency comb

Optical frequency locked loop for long-term stabilization of broad-line DFB laser frequency difference

Towards Stronger Coulomb Coupling in an Ultracold Neutral Plasma

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