gMOT

A compact grating Magneto-Optical Trap chip for the generation of ultra-cold atoms.

Features

Performance

  • Trapping over 10 million 87Rb atoms
  • Cooling below 40 µK

Application
Central to quantum technology research.

Simplification
Enables laser cooling with a single laser beam while significantly reducing the overall system volume, optical access requirements, apparatus complexity and cost.

Adaptable
Can operate either inside the vapour chamber or externally through a suitable window.

Validation
Each chip supplied with actual atom number and cooling data.

This work was published in Nature Nanotechnology.

Grating Magneto-Optical Trap. Laser cooling is greatly simplified, requiring only one laser beam incident on the grating for each stage of laser cooling. The other required beams are generated by diffraction from the grating.

Specifications

Performance Specifications

Loading rate of atoms into the MOT – >5×106 /sec
Steady state number of atoms in MOT – ~107
Temperature – 3 µK to 40 µK
Density – >1010 /cm3

Chip Physical Specifications

Dimensions: 22 x 22 x 0.5 mm
Grating region: 20 x 20 mm
Material coating: Aluminium
Chip material: Silicon
Weight: 0.6 g

Input Laser Beam Requirements

Wavelength: 780.24 nm
Frequency detuning: ~12 MHz
Power: ~50 mW
Polarisation: Circular polarised (Stokes parameter |S3|≥0.9)
Collimation: Divergence angle, |θ|≤0.1o
Incident angle: Normal +/- 1o
Beam size radius: 1/e2 radius ~17 mm

Vacuum and Magnetic Requirements

Base pressure: <1 x 10-9 mbar
Rb partial pressure: <5 x 10-9 mbar
Magnetic field: Quadrupole coils aligned with chip. Axial gradient of 0.1 T/m
Ambient DC field: ≤10 µT

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