ORC-Cylindric
ORC-Cubic
Reference Cavity in Vacuum

K E Y S P E C I F I C AT I O N S■ 5 cm Cubic or 12 cm Cylindric ULESpacer■ Thermal Noise Limit at 1.6 x 10-16(ADEV)■ Wavelength
500–2000 nm (IBS Coatings)
900–5000 nm (XTAL Coatings)■ Ion-getter Pump and Controller

A P P L I C AT I O N S

The Optical Reference Cavity (ORC) series is our solution when customization is pivotal.
Choose from the exceptional portfolio of adaptations, auxiliary instruments and services
and profit from our experience in designing generations of ultrastable laser systems.
The ORC family are Fabry-Pérot-type cavities with a resonator spacer made out of ultralow expansion glass (ULE). The cavity is mounted in a sealed vacuum housing, engineeredfor exceptional temperature stability to enable low frequency drift. The compact designensures minimal spatial demand. The ORC-Cubic is available as a 6U, 19” rack module.
It is based on a rigidly mounted cubic spacer licensed from National Physical Laboratory.
The ORC-Cylindric uses a cylindric spacer designed by the Physikalisch Technische Bundesanstalt, that is horizontally mounted on four support points. Here, portability is ensured
by a mechanical locking mechanism.
A broad variety of add-ons and options is available for customization: mirror substrates
are available as ULE or fused silica (FS), mirror coatings can either be ion-beam sputtered (IBS) or crystalline (XTAL), the latter is needed when ultimately low thermal noise
is paramount. The highly reflective coatings are available over a broad wavelength range
and also as dual or triple highly reflective mirrors. Modules for input coupling, PDH locking, and output monitoring can be rigidly mounted onto the chamber, rendering tedious
realignments after transportation obsolete.
Every system is baked-out during the assembly process. The built-in NTC and Peltier elements are accessible via vacuum feedthroughs, allowing for operation at the zero crossingof the coefficient of thermal expansion (CTE). Characterization of the CTE is available on
request. Both cavities are also available without enclosure.

Reference Cavity Spacers■ Laser Frequency Stabilization■ Quantum Computing■ Laser Cooling and Trapping■ High Resolution Spectroscopy

OPTIONS■ Optics Module for Input Coupling, PDH
Locking, and Monitoring■ Fused Silica Mirror Substrates withULE Compensation Rings■ Rack-mounting (ORC-Cubic only)■ Crystalline Mirror Coatings (XTAL)■ Multiple Wavelengths Mirror Coatings■ High / Mid / Low Finesse■ Pound-Drever-Hall Servo Electronics■ TEC Driver■ Reference Cavity without Vacuum
Enclosure■ Reference Cavity Spacer■ Characterization of the Zero-Crossing
Temperature

ORC-Cylindric
ORC-Cubic
Reference Cavity in Vacuum
S P E C I F I C AT I O N SWavelength

ORC-CUBIC

ORC-CYLINDRIC
500 – 2000 nm (IBS Coatings)
900 – 5000 nm (XTAL Coatings)

FinesseCavity Length
Free Spectral Range
Windows
Thermal Shields
Linear Drift Rate
Ambient Temperature Sensitivity
Temperature Sensor
Peltier Elements
Ion Getter Pump
Achievable Pressure
Stainless Steel Valve
Dimensions
Vacuum Chamber Material
Mass
Rack Integration

Low / Mid / High
5 cm
12.1 cm
3 GHz
1.24 GHzAR Coated, Angled and Wedged
Active and Passive
Active~ 150 mHz/s~ 4 mK/°C
10 k W NTC
2 x 25 W
1 x 56 W
5 l/s
10 l/s-7< 10 mbar
Cu Sealed, KF Flange
Cu Sealed, CF Flange
W 28 cm, L 28 cm, H 18 cm
W 48 cm, L 35 cm, H 35 cmAluminum
Stainless Steel
15 kg
55 kg
19”, 6U Enclosure (optional)n.a.

C A L C U L AT E D T H E R M A L N O I S E F L O O R
M I R R O R S U B S T R AT E S – M I R R O R C O AT I N G S
ULE-IBS

FS-IBSF S - X TA L

Thermal noise ADEV limit
5 cm CUBIC

1.4 x 10-16

9 x 104 x 10-16

Thermal noise ADEV limit
12 cm CYLINDRICAL

5.8 x 10-16

3.8 x 10-161.6 x 10-16-15

O R D E R I N G I N F O R M AT I O N
Product CodeORC-Cubic

ORC-CylindricPlease call for pricing. Specifications are subject to change without notice. Custom modifications are available, please inquire. The cubic cavity is an NPL patented design that is soldunder a licensing agreement with the National Physical Laboratory (NPL). This configuration of the NPL cavity is intended for terrestrial use only. For further information on space-customised or space-qualified cavities, please contact NPL.

Menlo Systems GmbHT+49 89 189 166 0sales@menlosystems.com

www.menlosystems.com

Menlo Systems US
T+1 303 635 6406
ussales@menlosystems.com

Menlo Systems Japan
T+81 907 409 20 21
jpsales@menlosystems.com

Menlo Systems China
T+86 21 6071 1678
chinasales@menlosystems.com

D-ORC-Cubic/ORC-Cylindric-EN 01/03/2024