[MenloSystems GmbH]


The Optical Reference System (ORS) consists of a fiber laser locked to a stable high‐finesse cavity made of ultralow expansion (ULE) glass. The compact design allows for integration of high vacuum, temperature stabilization, vibration and acoustic isolation into a 19” system while delivering state‐of‐the‐art laser linewidth and stability. Additionally, the system design includes a mechanical locking feature which allows for transportation of the system without the need to readjust the beam coupling into the cavity, once the mechanism is disengaged.




  • ultra high-finesse cavity (spacer and mirrors) made out of ultra low expansion glass
  • temperature stabilization of the cavity
  • complete conflat flange sealed UHV system
  • mechanical transport lock which allows for setting up and moving the system without optical readjustment
  • active vibration isolation platform
  • acoustic isolation
  • polarization maintaining cw laser
  • stabilization of optical power
  • SYNCRO lockbox using the Pound-Drever-Hall locking scheme



Related Applications

  • ultra high precision spectroscopy
  • low noise RF generation
  • interrogation of optical clocks
  • metrology




1542 nm (customizable)

Temperature of minimal thermal expansion > 20°C
Stabilized output power > 5 mW
Finesse > 400 000
Linewidth < 1 Hz
Stability : Allan deviation (1-10 s) (linear drift removed) < 3 · 10-15
Linear drift rate < 150 mHz/s
Utility and environmental requirements
Power AC power 110-230 V
Frequency 50 to 60 Hz

Lab temperature stability

± 1°C

Dimensions and weight

Optical unit

600 mm x 600 mm x 800 mm; 150 kg

Control electronics

rack unit 12U; 20 kg