ORS-Compact

Ultrastable optical reference with excellent phase noise and frequency stability.

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ORS-Compact Optical Reference System - Ultrastable optical reference

Compact High Performance

Efficient system design with integrated monitoring and control

Superior Phase Stability

Excellent phase noise and frequency stability for precision use

Field-ready Design

Rigid cavity mounting ensures reliable deployment outside labs

Broad Customization

Wide wavelength options and flexible configurations available

Integrated Rack System

Single 19” rack with control, monitoring, and vibration isolation

Automated Laser Locking

Stable, unattended operation for continuous 24/7 performance

Specifications

	ORS-Compact
Wavelength	650 – 1600 nm
Stability (MADEV at 1 s, linear drift removed)	< 2 × 10⁻¹⁵
Linewidth	< 1 Hz
Phase Noise (at 1542 nm*, Laser Source Dependent)	at 1 Hz	−7 dBc/Hz
	at 10 Hz	−27 dBc/Hz
	at 100 Hz	−45 dBc/Hz
	at 1000 Hz	−70 dBc/Hz
*Scaling accordingly for different carrier frequencies	For all models spurious signals < −20 dBc
Output Power	> 10 mW (FC/APC connector), high power on request
Cavity Spacer	5 cm, ULE, Cubic Design (licensed from NPL, UK)
Free Spectral Range	3 GHz
Linear Drift Rate	approx. 150 mHz/s
Vibration Isolation Platform	included

Options

The EOM Sideband Lock Package provides a broadly-tunable, ultrastable laser output. Here, an electro-optic modulator (EOM) is used to generate sidebands on the laser light that is sent to the cavity. Subsequently, a modulation sideband is coupled into the reference cavity, while the carrier is used as a frequency tunable, ultrastable user output. A tuning of up to half of the free spectral range (±0.5 × FSR) is possible.

The ORS-FNC extension package enables the transmission of sub-Hz linewidth laser light through active phase-noise compensation of the ultrastable laser output. The ORS-FNC interferometrically detects the phase noise induced by temperature variations and vibrations in the fiber and actively compensates this using a phase-locked loop and an AOM as actuator. The residual noise contribution of such a stabilized fiber link is well below the frequency stability of the ORS.

For the simultaneous stabilization of multiple lasers to the same reference cavity, custom coating designs and cavity mirrors which are highly reflective at two or multiple wavelengths can be tailored to your application.

The ORS-SHG extension includes a frequency doubling unit which is integrated into your system with a free-space or fiber-coupled output. This allows to build an ultrastable laser system at longer wavelengths by frequency doubling its output, which can be advantageous in many applications (e.g., at 1397 nm for the Strontium clock transition at 698 nm).

The ORS-HP options allow to amplify the standard 10 mW output signal of the ultrastable laser to the power level required for your application (e.g. for achieving > 1 W at 729 nm for Ca⁺ experiments). The amplifiers are placed within the frequency stabilization servo loop and thus merely affect the system’s stability.

The ORS-DDRIFT package is designed to compensate the inevitable linear drift of the aging reference cavity. It includes a direct digital frequency synthesizer (DDS), a high-power RF amplifier, an acousto-optic modulator (AOM) and a software-module. An adjustable linear frequency ramp is programmed to the DDS and applied to the system’s acousto-optic modulator to compensate the linear drift.

The ORS-DSRV Package provides a digital servo interface to stabilize the frequency of the ultrastable laser to a user-given target (e.g., a clock transition). It includes a direct digital frequency synthesizer (DDS), a high-power RF amplifier, an acousto-optic modulator (AOM) and a software-module. The user must supply a frequency error reading and the SYNCRO control platform integrates it and feeds it back to an AOM in order to stabilize the laser to the external reference.

General Information:

Electronic modules that come with an extension package typically slide into Menlo Systems SYNCRO (3^rd gen) control platform. This guarantees smooth integration into the existing hardware and software infrastructure.