Spezifikationen

Beschreibung

The High Finesse Optical Reference Cavity with Crystalline Mirrors (XM-ORC) is borne out of the combined expertise of Menlo Systems (ultrastable laser systems and reference cavities) and Thorlabs (high performance optical components) and is the solution when customization and ultimate performance are paramount.

The Menlo Systems supplied Fabry-Pérot-type cavity comprises a cylindrical resonator spacer made out of ultra-low expansion glass (ULE) designed by the Physikalisch Technische Bundesanstalt (PTB) in Germany. The cavity is mounted horizontally on four support points within a sealed stainless steel vacuum housing and is engineered for exceptional temperature stability to enable low frequency drift. The compact design ensures minimal spatial demand and portability is ensured by a mechanical locking mechanism.

Thorlabs provides the cavity mirrors consisting of a substrate-transferred crystalline (xtal stable) coating on a fused silica substrate for maximum reduction in thermal noise and excellent optical performance. Note that each mirror is spatially mapped for optical losses to ensure the target finesse is realized.

Every system is baked-out during the assembly process and a vacuum pump and temperature controller are included. The addition of ULE thermal compensation rings (licensed from PTB) ensures that room temperature operation will roughly correspond to the zero crossing of the thermal expansion coefficient for the assembled cavity.

Calculated thermal noise floor

 

	FS-XTAL
Thermal noise ADEV limit 12 cm CYLINDRIC	1.6 x 10-16