ORS
Ultrastable Laser System

Spezifikationen

Advanced Features and Benefits

Top-of-the-line system designed for ultimate performance
Ultimate phase noise and frequency stability
Easily transportable (mechanical transport lock)
Highly customizable—available over wide range of wavelengths and with many options
Robust and well-engineered single 19” rack system including monitor & control system and vibration isolation platform.
Automated laser locking—24/7 operation

	ORS
Wavelength	650–1600 nm (ORS), 900–1600 nm (ORS with ORS-FS-XTAL)
Stability (MADEV at 1 s, linear drift removed)	<7 x 10^-16 (ORS with FS-XTAL option) <1 x 10^-15 (ORS with ULE-IBS)
Linewidth	<1 Hz
Phase Noise (laser source dependent)	ORS ORS with ORS-FS-XTAL at 1 Hz -8 dBc/Hz -10 dBc/Hz at 10 Hz -27 dBc/Hz -30 dBc/Hz at 100 Hz -47 dBc/Hz -47 dBc/Hz at 1000 Hz -70 dBc/Hz -70 dBc/Hz For all models spurious signals <-20 dBc
Output Power	>10 mW (FC/APC connector), high power on request
Cavity Spacer	12.1 cm, ULE, cylindric design
Free Spectral Range	1.24 GHz
Linear Drift Rate	approx. 150 mHz/s
Vibration Isolation Platform	included

Beschreibung

The Optical Reference System (ORS) is designed for uncompromised performance. It delivers ultra-narrow linewidth laser light with outstanding frequency stability.

The system’s centerpiece is a high-finesse Fabry-Pérot cavity (cylindric spacer with a length of 12.1 cm) serving as a reference for a CW laser. The cavity is made out of ultra-low expansion glass (ULE) and is operated in vacuum at the point of zero thermal expansion. The reference cavity is actively decoupled from vibrations and acoustically isolated allowing for ultimate performance also in rough laboratory environments. An easy-to-use cavity-locking mechanism ensures portability without realignment of the optical paths.

The system is operated by the newest generation of Menlo Systems’ proprietary SYNCRO controller—a modular electronics platform designed for versatility and intuitive use. It incorporates all required electronics, e.g., a low-noise laser driver and a very fast (analog) servo loop for laser frequency stabilization. The user controls all parameters using either the 7” front-panel touchscreen or a GUI on a remote PC. The onboard software ensures automatic cavity locking and system monitoring.

Watch a system demonstration of the ORS system here:

Optionen

Crystalline Mirror Coating Package

Product Code: ORS-FS-XTAL
The ORS-FS-XTAL option extension allows to achieve the ultimate short-term frequency stability for clock applications by employing highly reflective crystalline coatings used on fused silica substrates as cavity mirrors, thus strongly reducing the thermal noise floor. In addition, the intracavity power is actively stabilized with a feedback to an AOM.
Available only for the ORS for selected wavelengths above 900 nm.
EOM Sideband Lock Package

Product Code: ORS-EOM-SBL
The EOM Sideband Lock Package provides a broadly-tunable, ultrastable laser output. Here, an electro-optical 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.
Fiber Noise Cancellation Package

Product Code: ORS-FNC
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.
Multiple-Wavelengths Mirror Coatings Package

Product Code: ORS-MWL
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.
Second Harmonic Generation Package

Product Code: ORS-SHG
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).
High Output Power Package

Product Code: ORS-HP
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.
Cavity de-Drifting Package

Product Code: ORS-DDRIFT
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-optical modulator (AOM) and a software-module. An adjustable linear frequency ramp is programmed to the DDS and applied to the system’s acousto-optical modulator to compensate the linear drift.
Digital Servo Interface Package for Stabilization to External Atomic Transition

Product Code: ORS-DSRV
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-optical 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 (3rd gen) control platform. This guarantees smooth integration into the existing hardware and software infrastructure.