Agilent/Keysight 10725B

The Keysight 10725B is a precision laser head and beam splitter designed for interferometric displacement measurement and positioning systems. Operating at 632.99137 nm with exceptional wavelength stability, this component divides incident light into two orthogonally polarized beams with a 50:50 splitting ratio. The unit delivers wavelength accuracy of ±0.1 ppm over its lifetime and short-term stability of ±0.002 ppm in one hour, making it suitable for precision dimensional metrology and motion control applications requiring measurement ranges up to 40 meters across all axes.

– Technical Specifications

• Wavelength: 632.99137 nm (nominal, vacuum)
• Wavelength Accuracy: ±0.1 ppm (vacuum, 3 sigma, lifetime)
• Wavelength Stability: ±0.002 ppm (1 hour, typical, vacuum); ±0.02 ppm (lifetime, vacuum)
• Beam Splitting Ratio: 50:50
• Polarization: f1 horizontal, f2 vertical; measurement reference derived from f1–f2 difference
• Beam Diameter: Typically 6 mm or less; 9 mm options available with appropriate optics
• Measurement Range: 40 meters (130 feet) sum of all axes
• Heat Dissipation: 23W operating; 35W warm-up
• MTBF: > 50,000 hours typical
• Magnetic Field Strength: ≤5.25 milliGauss at 4.6 m (15 ft) from packaged unit surface
• Safety Classification: Class II laser (21 CFR 1040.10, 1040.11)

– Key Features

• Precision glass beam splitter construction with minimal optical loss
• Exceptional wavelength stability over short and extended timeframes
• Dual orthogonal polarization outputs enable heterodyne measurement schemes
• Compact optical head rated for extended operational life
• Magnetic shielding inherent to design meets field strength limits

– Typical Applications

• Laser interferometry positioning and displacement measurement
• Precision dimensional metrology systems
• Multi-axis motion control feedback
• High-accuracy positioning applications

– Compatibility & Integration

Integrates within Keysight laser interferometer systems with optics configured for 6 mm or smaller beam diameters. Bare optical components (10725A, 10726A, 10728A) support 9 mm beam paths with user-supplied mounts. System integration via Keysight IO Libraries Suite (VISA, SICL) for PC-based control. Cabling clearance: 12 cm (5517A) or 10.16 cm (5517B/BL/C/CL/D/DL/EL/FL/GL) beyond unit rear.