Design of laser system for absolute gravimeter based on87Rb atom interferometer

The paper describes a Raman-laser system with high performance for an absolute gravimeter that was based on 87Rb atom interferometer. As our gravimeter is a part of the standard acceleration of gravity of China, the Raman lasers’ characteristics should be considered. This laser system includes two diode lasers. The master laser is frequency locked through the frequency-modulation (FM) spectroscopy technology. Its maximum frequency drift is better than 50 kHz in 11 h, which is measured by home-made optical frequency comb. The slave laser is phase locked to the master laser with a frequency difference of 6.8346 GHz while using an optical phase lock loop (OPLL). The phase noise is lower than −105 dBc/Hz at the Fourier frequency from 200 Hz to 42 kHz. It is limited by the measurement sensitivity of the signal source analyzer in low Fourier frequency. Furthermore, the power fluctuation of Raman lasers’ pulses is also suppressed by a fast power servo system. While using this servo system, Raman lasers’ pulses could be fast re-locked while its fast turning on again in the pulse sequence. The peak value fluctuation of the laser power pulses is decreased from 25% to 0.7%, which is improved over 35 times. This Raman-laser system can stably operate over 500 h, which is suited for long-term highly precise and accurate gravity measurements.

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Compact portable 795nm DFB diode laser system for atom interferometer

International Conference on Optoelectronic and Microelectronic Technology and Application ◽

10.1117/12.2585442 ◽

2020 ◽

Author(s):

Yuan Zhao ◽

Jun Gao ◽

Jie Guo ◽

Yuan Yao ◽

Hongwei Song

Keyword(s):

Diode Laser ◽

Laser System ◽

Atom Interferometer

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A Cold-Atom Interferometer with Microfabricated Gratings and a Single Seed Laser

10.21203/rs.3.rs-736276/v1 ◽

2021 ◽

Author(s):

Jongmin Lee ◽

Roger Ding ◽

Justin Christensen ◽

Randy Rosenthal ◽

Aaron Ison ◽

...

Keyword(s):

System Architecture ◽

Vibration Isolation ◽

Laser System ◽

Cold Atom ◽

Atom Interferometer ◽

Atomic Coherence ◽

Seed Laser ◽

Sensor Head ◽

Single Seed ◽

Vacuum Package

Abstract The extreme miniaturization of a cold-atom interferometer accelerometer requires the development of novel technologies and architectures for the interferometer subsystems. 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. The vacuum package is integrated into the optomechanical design of a compact cold-atom sensor head with fixed optical components. In addition, a multichannel laser system driven by a single seed laser has been implemented with time-multiplexed frequency shifting using single sideband modulators, reducing the number of optical channels connected to the sensor head. This laser system architecture is compatible with a highly miniaturized photonic integrated circuit approach, and by demonstrating atom-interferometer operation with this laser system, we show feasibility for the integrated photonic approach. In the compact sensor head, sub-Doppler cooling in the GMOT produces 15 μK temperatures, which can operate at a 20 Hz data rate for the atom interferometer sequence. After validating atomic coherence with Ramsey interferometry, we demonstrate a light-pulse atom interferometer in a gravimeter configuration without vibration isolation for 10 Hz measurement cycle rate and T = 0 - 4.5 ms interrogation time, resulting in Δg/g = 2.0e-6. All these efforts demonstrate progress towards deployable cold-atom inertial sensors under large amplitude motional dynamics.

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Realization of a compact one-seed laser system for atom interferometer-based gravimeters

Optics Express ◽

10.1364/oe.26.001586 ◽

2018 ◽

Vol 26 (2) ◽

pp. 1586 ◽

Cited By ~ 6

Author(s):

Jie Fang ◽

Jiangong Hu ◽

Xi Chen ◽

Haoran Zhu ◽

Lin Zhou ◽

...

Keyword(s):

Laser System ◽

Atom Interferometer ◽

Seed Laser

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A fibered laser system for the MIGA large scale atom interferometer

Scientific Reports ◽

10.1038/s41598-020-59971-8 ◽

2020 ◽

Vol 10 (1) ◽

Cited By ~ 2

Author(s):

D. O. Sabulsky ◽

J. Junca ◽

G. Lefèvre ◽

X. Zou ◽

A. Bertoldi ◽

...

Keyword(s):

Large Scale ◽

Laser System ◽

Atom Interferometer

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{10} edge dislocations in YSZ films grown on (100)MgO by PLD

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100170384 ◽

1994 ◽

Vol 52 ◽

pp. 530-531

Author(s):

Jason R. Heffelfinger ◽

C. Barry Carter

Keyword(s):

Thin Films ◽

Semiconductor Lasers ◽

Vapor Deposition ◽

Substrate Surface ◽

Laser System ◽

Average Energy ◽

Target Material ◽

Chemical Vapor ◽

Buffer Layers ◽

Organic Chemical

Yttria-stabilized zirconia (YSZ) is currently used in a variety of applications including oxygen sensors, fuel cells, coatings for semiconductor lasers, and buffer layers for high-temperature superconducting films. Thin films of YSZ have been grown by metal-organic chemical vapor deposition, electrochemical vapor deposition, pulse-laser deposition (PLD), electron-beam evaporation, and sputtering. In this investigation, PLD was used to grow thin films of YSZ on (100) MgO substrates. This system proves to be an interesting example of relationships between interfaces and extrinsic dislocations in thin films of YSZ.In this experiment, a freshly cleaved (100) MgO substrate surface was prepared for deposition by cleaving a lmm-thick slice from a single-crystal MgO cube. The YSZ target material which contained 10mol% yttria was prepared from powders and sintered to 85% of theoretical density. The laser system used for the depositions was a Lambda Physik 210i excimer laser operating with KrF (λ=248nm, 1Hz repetition rate, average energy per pulse of 100mJ).

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