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Cryo-Optical Spectroscopies

The Montana Instruments CryoRaman microscope is used to perform low temperature microphotoluminescence and microRaman spectroscopies at temperatures of 3K-350K.  Quantum Opus superconducting nanowire single photon detectors (SNSPDs) are fiber coupled to the microscope for single photon and two-photon interferometry at visible wavelengths, and a PI IsoPlane SCT-320 imaging spectrograph is integrated with the sample stage for hyperspectral mapping.  Free-space microphotoluminescence and microRaman measurements are developed now.  Microwave and fiber excitation are under development for initial experiments in spring 2020. Pulsed and CW excitation is possible with a variety of available laser sources.


  • Cryogen-free operation at temperatures of 3-350 K
  • Agile-temperature sample mount provides rapid sample temperature sweep while maintaining base temperature in cryostat
  • Dual 100x (0.85 NA and 0.75 NA) objective configuration for multiple laser excitation or transmission spectroscopies
  • Dual fiber micro positioners orthogonal to free-space access for fiber-optic access to sample
  • Tunable CW excitation at 405 nm, 532 nm, 450-650 nm, and 900-1300 nm
  • Pulsed excitation at 700-900 nm and 350-450 nm.
  • Microwave excitation available for ODMR and spin coherence measurements
  • Quantum Opus SNSPDs with 30-micron active area for single photon detection at wavelengths of 400-1000 nm
  • 5x5x5 mm sample travel
  • Gas tube assembly for gas injection to sample
  • Solid-state magnet for <0.3 T operation