Stable CW laser based on low thermal expansion ceramic cavity with 49 mHz/s frequency drift

Itō, Isao; Silva, Alissa; Nakamura, Takaki; Kobayashi, Yohei

doi:10.1364/oe.25.026020

Cited by 12 publications

(9 citation statements)

References 25 publications

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“…Using this lock, we achieve a long-term stability which is limited by the cavity spacer's aging process, which initially causes a linear frequency drift on the order of 2π × 5 kHz per day. The drift slows down exponentially with a measured time constant of 375 days as the spacer approaches equilibrium [34,35].…”

Section: Stirap Setupmentioning

confidence: 99%

Efficient conversion of closed-channel dominated Feshbach molecules of $^{23}$Na$^{40}$K to their absolute ground state

Bause,

Kamijo,

Chen

et al. 2021

Preprint

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We demonstrate the transfer of 23 Na 40 K molecules from a closed-channel dominated Feshbachmolecule state to the absolute ground state. The Feshbach molecules are initially created from a gas of sodium and potassium atoms via adiabatic ramping over a Feshbach resonance at 78.3 G. The molecules are then transferred to the absolute ground state using stimulated Raman adiabatic passage with an intermediate state in the spin-orbit-coupled complexOur measurements show that the pump transition dipole moment linearly increases with the closed-channel fraction. Thus, the pump-beam intensity can be two orders of magnitude lower than is necessary with open-channel dominated Feshbach molecules. We also demonstrate that the phase noise of the Raman lasers can be reduced by filter cavities, significantly improving the transfer efficiency.

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Section: Stirap Setupmentioning

confidence: 99%

Efficient conversion of closed-channel dominated Feshbach molecules of $^{23}$Na$^{40}$K to their absolute ground state

Bause,

Kamijo,

Chen

et al. 2021

Preprint

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“…Ultra-low-expansion glass (ULE) is today the most common material for use at or near room temperature. Another promising material is the ceramic Nexcera [12][13][14] . However, the Brownian motion imposes a fundamental limitation to their length stability 15 .…”

Section: Introductionmentioning

confidence: 99%

“…The drift rates vary substantially between units, with one of the smallest values being 1.6 × 10 −17 /s (Ref. 14). One approach for reducing both limitations is the operation of the resonators at cryogenic temperatures 6,7,[22][23][24][25][26][27][28][29] .…”

Section: Introductionmentioning

confidence: 99%

A simplified cryogenic optical resonator apparatus providing ultra-low frequency drift

Wiens

Kwong

Müller³

et al. 2020

Review of Scientific Instruments

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A system providing an optical frequency with an instability comparable to that of a hydrogen maser is presented. It consists of a 5 cm long, vertically oriented silicon optical resonator operated at temperatures between 1.5 K and 3.6 K in a closed-cycle cryostat with low-temperature Joule-Thomson stage. We show that with a standard cryostat, a simple cryogenic optomechanical setup, no active or passive vibration isolation, a minimum frequency instability of 2.5 × 10 −15 at τ = 1500 s integration time can be reached. The influence of pulse-tube vibrations was minimized by using a resonator designed for low acceleration sensitivity. With reduced optical laser power and interrogation duty cycle an ultra-low fractional frequency drift of −2.6×10 −19 /s is reached. At 3.5 K the resonator frequency exhibits a vanishing thermal sensitivity and an ultra-small temperature derivative 8.5×10 −12 /K 2 . These are favorable properties that should lead to high performance also in simpler cryostats not equipped with a Joule-Thomson stage.

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“…It is advertised as having high rigidity, high workability, and good long-term stability. It is used as the reference standard for coordinate measuring machines, high-precision mirrors for semiconductor inspection systems, telescopes [6], and stable laser cavities [7,8].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of long-term stability of low thermal expansion coefficient materials using gauge block interferometers

Hirai

Bitou

Oike

2018

Meas. Sci. Technol.

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The long-term stability of NEXCERA ™ ceramics having a low coefficient of thermal expansion was evaluated over a period of eight years. Several gauge blocks of differing lengths were prepared, using two types of NEXCERA. Each gauge block was kept wrung to a platen and its absolute length was periodically measured by gauge block interferometer during the eight years. Relative uncertainties of measurement of changes in gauge block length were estimated as 4.1 × 10 −8 and 2.9 × 10 −8 for 200 mm and 800 mm gauge blocks, respectively. The experimental results show the trend of expansion and a relative change of less than 0.1 × 10 −6 /year for every gauge block.

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Stable CW laser based on low thermal expansion ceramic cavity with 49 mHz/s frequency drift

Cited by 12 publications

References 25 publications

Efficient conversion of closed-channel dominated Feshbach molecules of $^{23}$Na$^{40}$K to their absolute ground state

Efficient conversion of closed-channel dominated Feshbach molecules of $^{23}$Na$^{40}$K to their absolute ground state

A simplified cryogenic optical resonator apparatus providing ultra-low frequency drift

Evaluation of long-term stability of low thermal expansion coefficient materials using gauge block interferometers

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