ORS-ULN
(Ultra-Low-Noise Ultrastable Laser System)
Ultra-low Noise Optical Reference System with Unmatched Frequency Stability at the 10⁻¹⁷ Level
The ORS-ULN represents the first commercial ultrastable laser system (1542 nm) delivering ultra-narrow linewidth (< 40 mHz) with an unprecedented fractional frequency stability in the 10-17 level at 1 s.
The product is the result of the joint development by Menlo Systems and the Physikalisch-Technische Bundesanstalt (PTB). The ORS-ULN centerpiece is an ultra-high-finesse single-crystal silicon cavity serving as the optical reference for the cw laser and it is based on the silicon cavity design (212 mm) first de monstrated by the PTB and Joint Institute for Laboratory Astrophysics (JILA) collaboration.
To achieve such a level of stability, the reference cavity is actively decoupled from vibrations, acoustically isolated, and stabilized at the zero-crossing tem perature of silicon at 123 K. Furthermore, the transportation lock mechanism ensures portability without realignment.
Each unit of the ORS-ULN consists of an optical and electronic rack, and it includes a separate closed-cycle cooler. Every system is fully characterized be fore shipment. The characterization is carried out against a reference system with equal or better performance.
Key Specifications
- Wavelength: 1542 nm
- Stability (MADEV, 1 s) <9.6 x 10-17
- Linewidth <40 mHz
Features
- Ultra-high-finesse Single-crystal Silicon Cavity
- Zero-crossing Temperature Stabilization at 123 K
- Ultra-high Vacuum (UHV) System
- Transportation-lock Mechanism
- Fiber Coupling
- All-included Commercial Solution (Optical Setup, Electronics and Fiber Rack, Cooling System)
Specifications
| Central Wavelength | 1542 nm | ||
| Stability (MADEV at 1s) | <9.6 x 10⁻¹⁷⁽¹⁾ | The stability performance is subject to further improvements (Best effort, MADEV at 1s: <5x10⁻¹⁷) | |
| Linewidth | <40 mHz ⁽²⁾ | ||
| Absolute Linear Drift Rate | <10 mHz/s ⁽³⁾ | ||
| Output Power | >5 mW (FC/APCc connector) | ||
| Dimensions and Mass | Optical part: 50 cm (L) x 60 cm (W) x 100 cm (H); Mass: 120 kg | Electronics and Fiber rack: 60 cm(L) x 80 cm (W) x 150 cm (H); Mass: 250 kg | Cooling system: 28 cm(L) x 45 cm (W) x 37 cm(H); Mass: 32 kg |
1) Measured at Tlab = 21±0.3 °C.
(2) Linewidth after locking, measurement time t >150 s.
(3) Measured at Tcavity = 123 K.
Operational Requirements
| Operating Voltage | 100 / 115 / 230 VAC at 50 Hz - 60 Hz | |
| Operating Temperature | Tlab = 22 ± 5 °C | The lab temperature must be stabilized within ± 0.5 °C |
| Power Consumption | <700 W | |
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