ORS
Ultrastable Laser

Specifications

Advanced Features and Benefits

State-of-the-art linewidth (<1Hz) and stability (<2 x 10^-15 Hz)
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

	ORS
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

Description

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.

Options

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.
Active RAM cancellation

Product Code: ORS-RAM
The residual amplitude noise (RAM) can be actively cancelled with an additional phase-locked loop in the ORS.
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.