The single-beam magneto-optical trap (MOT) based on the diffractive optical element offers a new route to develop compact cold atom sources. However, efficiency in previous MOT systems is usually low and unbalanced, which will affect quality of trapped atoms. To solve this issue, we developed centimeter-scale dielectric metasurface chip with dynamic phase distributions, was used split single incident laser beam into five separate ones well-defined polarization states uniform energy...

The performance of absolute atom gravimeters used on moving platforms, such as vehicles, ships and aircrafts, is strongly affected by the vibration noise. To suppress its influence, we introduce a compensation method, in which classical accelerometer to measure measurement results obtained show noise vehicle can be 2 orders magnitude greater than that lab during daytime, induce an interferometric phase fluctuation with standard deviation <inline-formula...

A low-cost distributed temperature sensing system based on Rayleigh scattering in irradiated optical fibers was first proposed. The prototype developed with a conventional time domain reflectometer and Ge/P co-doped fiber of 100 m. Three thermal tests were conducted the range -40 °C ~ 60 °C. Experimental results indicate that can achieve resolution 0.05 spatial 16.3 m at an average 52 s. Furthermore, analyzed theoretically simulations. simulation show 0.007 5 is obtained mainly by adjusting...

In order to explain the contradictory results on temperature dependence of radiation-induced attenuation (RIA) in optical fiber, color center absorption was proposed as a complementary explanation. The tests were conducted four prototype fibers after irradiation. During RIA at near infrared (NIR) wavelengths measured continuously. verified. competition between thermally annealing and temperature-dependent observed. test show that dependent NIR is an important factor influencing besides...

This paper shows a new way for measuring temperature in interferometric fiber-optic gyroscopes based on the dependence of integrated optical circuit. No component irrelevant to rotation sensing is involved. Calibration and tests were conducted. The demonstrated repeatability resolution are better than 0.5 °C. hysteresis error less 1.76% full scale. proposed method reliable, radiation-resistant, simple be implemented, which would make it suitable space application.

Polarization gradient cooling (PGC) plays an important role in many cold atom applications including the formation of Bose-Einstein condensates (BECs) and single atoms. Traditional parameter optimization PGC usually relies on subjective expertise, faces challenges fine manipulation, exhibits low efficiency. Here, we propose a segmented control method that differs from traditional process by expanding experiment parameters 3 to 30. Subsequently, conventional timing problem is reformulated as...

A model for the temperature sensitivity of radiation-induced attenuation (RIA) is investigated. The RIA spectra in a germanium (Ge) and phosphorous (P) co-doped fiber ranging from 825 to 1600 nm at different temperatures are measured decomposed according configurational coordinate model. It found that there linear relationship between parameters color center absorption band temperature. verified 850, 1310, 1550 by both simulation experiment. This work will be useful research on applications...

Polarization gradient cooling (PGC) plays an important role in many cold atom applications including the formation of Bose-Einstein condensates (BECs) and single atom. Traditional parameter optimization PGC usually relies on subjective expertise, faces challenges fine manipulation, exhibits low efficiency. Here, we propose a segmented control method that differs from traditional process by expanding experiment parameters 3 to 30. Subsequently, conventional timing problem is reformulated as...

Polarization gradient cooling (PGC) plays an important role in many cold atom applications including the formation of Bose-Einstein condensates (BECs) and single atom. Traditional parameter optimization PGC usually relies on subjective expertise, faces challenges fine manipulation, exhibits low efficiency. Here, we propose a segmented control method that differs from traditional process by expanding experiment parameters 3 to 30. Subsequently, conventional timing problem is reformulated as...

Laser cooling, which cools atomic and molecular gases to near absolute zero, is the crucial initial step for nearly all gas experiments. However, fast achievement of numerous sub-$\mu$K cold atoms challenging. To resolve issue, we propose experimentally validate an intelligent polarization gradient cooling approach enhanced by optical lattice, utilizing Maximum Hypersphere Compensation Sampling Bayesian Optimization (MHCS-BO). MHCS-BO demonstrates a twofold increase in optimization...

Polarization gradient cooling (PGC) plays an important role in many cold atom applications including the formation of Bose-Einstein condensates (BECs) and single atom. Traditional parameter optimization PGC usually relies on subjective expertise, faces challenges fine manipulation, exhibits low efficiency. Here, we propose a segmented control method that differs from traditional process by expanding experiment parameters 3 to 30. Subsequently, conventional timing problem is reformulated as...

Abstract We numerically study a matter wave interferometer realized by splitting trapped Bose-Einstein condensate with phase imprinting. show that simple step-like imprinting pattern rapidly decays into string of vortices can generate opposite velocities on the two halves condensate. first in detail and launching effect these vortex structures, whose functioning resembles one conveyor belt, we initial exit velocity along belt be controlled continuously adjusting distance. finally...

An all fiber-optic temperature sensor based on the dependence of radiation-induced attenuation (RIA) Ge/P co-doped optical fiber at 850 nm was proposed.The principle interpreted by color center absorption.Characteristics sensor, such as dynamic range, sensitivity, linearity, and repeatability, were tested analyzed.The range -40°C to 60°C, sensibility 0.1146dB/°C.The nonlinearity error repeatability respectively ±2.75% 1.06%.

A technique for determining the optical path difference (OPD) between two Raman beams using a frequency-modulated continuous-wave method is investigated. This approach greatly facilitates measurement and adjustment of OPD when tuning essential to minimize effects diode laser's phase noise on lasers. As demonstration, frequencies beat note with different OPDs are characterized analyzed. When measured frequency 0.367 Hz, zero. The laser system after implementation zeroing also measured.

The high-precision gravity measurements of cold atom experiments puts highly demands on the design and qualification magneto-optical trap. We present a new modular trap for cooling manipulation rubidium interferometry based free space optical bench technology, which has been developed portable atomic inertial sensor. setup consists an integrated laser injecting module, Raman module reflecting mirror attached to single tri-axial accelerometer. traditional includes 3 pairs commercial lens, are...

We have developed a modified Michelson interferometer type Raman laser system to manipulate cold 87 Rb atoms interfere. A frequency modulated continuous wave technique was introduced determine the optical path difference, thus compensating it zero minimize effects of common mode noise. The linewidth (full width at half maximum) beat signal 6.834 GHz measured 1Hz limited by resolution bandwidth spectral analyzer. rms phase variance noise 166 MHz 0.015 rad2, mainly restricted our poor...

Raman-pulse atom interferometers, having been proved as powerful tools for quantum sensing, become more and compact, transportable, field-applicable benefiting from the advances of matured all-fiber laser sources, but also suffer polarization degradation, power ratio fluctuations accompanied with fiber links, frequency conversion phase modulation process. In this paper, we propose a fiber-integrated single-sideband modulated Raman source simultaneous implementation optimization,...

We numerically study a matter wave interferometer realized by splitting trapped Bose-Einstein condensate with phase imprinting. show that simple step-like imprinting pattern rapidly decays into string of vortices can generate opposite velocities on the two halves condensate. first in detail and launching effect these vortex structures, whose functioning resembles one conveyor belt, we initial exit velocity along belt be controlled continuously adjusting distance. finally characterize...