Ultrastable Laser

MENLO ORS1500 3w


Advanced Features and Benefits

  • State-of-the-art linewidth (<1Hz) and stability (<2 x 10-15 )
  • Compact footprint (60 x 80 cm)
  • Fully characterized at Menlo Systems against another Optical Reference System
  • Custom systems tailored to customers' needs
  • The ORS can save you valuable R&D time, enabling you to focus on your experiments.
  • 12 cm long cylindrical cavity
Wavelength 1542, 1064, 657, 698, 729, 1156 nm and many others between 500-1600 nm
Temperature of minimal thermal expansion between 20-35 °C
Output power >10 mW
Finesse ≈250 000*
Linewidth <1 Hz
Stability (MADEV at 1s, linear drift removed) <2 x 10-15 (ULE substrate), <1 x 10-15 (fused silica substrate), <7 x 10-16 (crystalline coatings)
Linear drift rate approx. 150 mHz/s



The Optical Reference System (ORS) delivers an optical output with ultra narrow linewidth and outstanding short term stability. It consists of a cw laser locked to a stable high-finesse cavity made of ultra low expansion (ULE) glass. The compact design allows for integration of the vacuum chamber, control electronics, vibration isolation platform and acoustic isolation into a 19” rack system and delivers 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. Every system is fully characterized at Menlo Systems before shipment. The characterization is carried out either against a reference system with equal or better performance, or in a three cornered hat comparison.

Watch a system demonstration of the ORS system here:


  • Doppler cancellation system

    Product Code: ORS-Doppler

    For long distance transmission of sub-Hz linewidth through optical fibers (over 5 or 10 m) we recommend active phase noise compensation of the ORS Output. This involves measuring the phase noise induced by temperature variations and vibrations in the fiber through a back-reflection, and actively compensates this with a phase-locked loop.

  • Frequency shifting AOM

    Product Code: ORS-Frequency Shift

    The ORS can be tuned over tens of picometers in steps of the free-spectral-range. To reach a specific frequency in-between these steps (e.g. the Strontium transition at 698 nm), an additional noise-free frequency shift is required using acousto-optic modulators. ORS-Frequency Shift provides the precise output at the desired frequency for the ORS.

  • Frequency doubling

    Product Code: ORS-SHG

    It can be advantageous to lock the CW at half the frequency of the desired output, and add second harmonic generation (e.g. 1397 nm for the Strontium clock transition, with SHG to 698 nm). Frequency doubling can be integrated into your ORS system with free-space or fiber-coupled output.


 modallan ORS v2 20190129


PN ProfKatoriCavities v3 20190129 2

Menlo Expert Sandra de Vega 2021
Dr. Sandra de Vega
Your direct line to our expert

Data sheets

Product literature

Ordering information

  • Product Code
  • ORS

+49 89 189166 0

Menlo Systems, Inc.
+1 973 300 4490

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