Compact atom interferometer using single laser

Chiow, Sheng‐wey; Yu, Nan

doi:10.1007/s00340-018-6965-2

Cited by 12 publications

(3 citation statements)

References 29 publications

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“…Furthermore, to obtain a long-term coherent time, the phase noise of the Raman operation laser has to be as low as possible. Plenty of technologies, such as optical phase locking (OPL) [21][22][23][24][25] and directly modulated lasers [26][27][28][29] , have been developed to generate phase-coherent optical fields with gigahertz frequency difference for Raman operation. Among these technologies, OPL typically necessitates two separate laser sources and complex electrical feedback controls and suffers from poor robustness and high system complexity.…”

Section: Introductionmentioning

confidence: 99%

Generation of visible Raman operation laser by a fiber electro-optical modulator feedback loop

Li,

Ye,

Chen

et al. 2024

中国光学快报

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Phase-coherent multi-tone lasers play a critical role in atomic, molecular, and optical physics. Among them, the Raman opeartion laser for manipulating atomic hyperfine qubits requires gigahertz bandwidth and low phase noise to retain long-term coherence. Raman operation lasers generated by directly modulated and frequency-multipled infrared lasers are compact and stable but lack feedback control to actively suppress the phase noise, which limits their performance in practical applications. In this work, we employ a fiber electro-optical modulator driven by a voltage-controlled oscillator (VCO) to modulate a monochromatic laser and employ a second-harmonic generation process to convert it to the visible domain, where the beat note of the Raman operation laser is stabilized by controlling the output frequency of VCO with a digital phase-locked loop (PLL). The low-frequency phase noise is effectively suppressed compared to the scheme without active feedback and it reaches −80 dBc=Hz@5 kHz with a 20 kHz loop bandwidth. Furthermore, this compact and robust scheme effectively reduces the system's complexity and cost, which is promising for extensive application in atomic, molecular, and optical physics.

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Section: Introductionmentioning

confidence: 99%

Generation of visible Raman operation laser by a fiber electro-optical modulator feedback loop

Li,

Ye,

Chen

et al. 2024

中国光学快报

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“…This integrated beam delivery approach can be designed to support wavelengths from 405 nm -2350 nm 41 and can be integrated with other key active and passive components [48][49][50][51] , including lasers 52,53 , ultra-low power consumption modulators 51 , and reference cavities 54 , to further reduce the size of 3D-MOTs. The system can be designed for operation at wavelengths for different atom species, including, for example, neutral strontium (atomic clock transitions in the range from 461 nm − 813 nm 6 ) and cesium (MOTs at 852 nm 55 ). These results show promise for the next generation of ultracompact and portable cold atom systems.…”

mentioning

confidence: 99%

Photonic integrated beam delivery for a rubidium 3D magneto-optical trap

et al. 2023

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Cold atoms are important for precision atomic applications including timekeeping and sensing. The 3D magneto-optical trap (3D-MOT), used to produce cold atoms, will benefit from photonic integration to improve reliability and reduce size, weight, and cost. These traps require the delivery of multiple, large area, collimated laser beams to an atomic vacuum cell. Yet, to date, beam delivery using an integrated waveguide approach has remained elusive. Here we report the demonstration of a 87Rb 3D-MOT using a fiber-coupled photonic integrated circuit to deliver all beams to cool and trap > 1 ×106 atoms to near 200 μK. The silicon nitride photonic circuit transforms fiber-coupled 780 nm cooling and repump light via waveguides to three mm-width non-diverging free-space cooling and repump beams directly to the rubidium cell. This planar, CMOS foundry-compatible integrated beam delivery is compatible with other components, such as lasers and modulators, promising system-on-chip solutions for cold atom applications.

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“…To ensure that the LPAI can operate in high-dynamic conditions, the laser system must be designed to withstand such conditions since it is subjected to similar dynamics. Substantial efforts have been made towards the development of compact and robust laser systems [58][59][60][61][62] , including recent demonstrations with SSBMs 63,64 and single seed lasers 24,[65][66][67] . Many of these systems are based on discrete components with fiber-to-fiber connections or free-space optical path connections (with optomechanical alignment mounts), which limit their ability to withstand high dynamics and severely limit manufacturing scalability.…”

mentioning

confidence: 99%

A compact cold-atom interferometer with a high data-rate grating magneto-optical trap and a photonic-integrated-circuit-compatible laser system

et al. 2022

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The extreme miniaturization of a cold-atom interferometer accelerometer requires the development of novel technologies and architectures for the interferometer subsystems. Here, we describe several component technologies and a laser system architecture to enable a path to such miniaturization. We developed a custom, compact titanium vacuum package containing a microfabricated grating chip for a tetrahedral grating magneto-optical trap (GMOT) using a single cooling beam. In addition, we designed a multi-channel photonic-integrated-circuit-compatible laser system implemented with a single seed laser and single sideband modulators in a time-multiplexed manner, reducing the number of optical channels connected to the sensor head. In a compact sensor head containing the vacuum package, sub-Doppler cooling in the GMOT produces 15 μK temperatures, and the GMOT can operate at a 20 Hz data rate. We validated the atomic coherence with Ramsey interferometry using microwave spectroscopy, then demonstrated a light-pulse atom interferometer in a gravimeter configuration for a 10 Hz measurement data rate and T = 0–4.5 ms interrogation time, resulting in Δg/g = 2.0 × 10−6. This work represents a significant step towards deployable cold-atom inertial sensors under large amplitude motional dynamics.

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Compact atom interferometer using single laser

Cited by 12 publications

References 29 publications

Generation of visible Raman operation laser by a fiber electro-optical modulator feedback loop

Generation of visible Raman operation laser by a fiber electro-optical modulator feedback loop

Photonic integrated beam delivery for a rubidium 3D magneto-optical trap

A compact cold-atom interferometer with a high data-rate grating magneto-optical trap and a photonic-integrated-circuit-compatible laser system

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