Agilent/Keysight 5517B

The Agilent/Keysight 5517B is a helium-neon laser head engineered for precision metrology and measurement applications requiring nanometer-level accuracy. This gas laser operates at 633 nm (red, Class 2) with orthogonally polarized frequency components, delivering 180 µW to 1 mW of continuous-wave output power. Integrated control electronics and a compact form factor make it suitable for laser interferometer systems used in dimensional metrology, machine tool calibration, semiconductor alignment, and precision manufacturing workflows.

Technical Specifications

• Wavelength: 633 nm


• Output Power (CW): 180 µW to 1 mW; minimum 120 µW


• Wavelength Stability (1 hour): 2 ppb (vacuum)


• Wavelength Stability (Lifetime): 20 ppb


• Wavelength Accuracy: ±0.1 ppm (standard); ±0.02 ppm (with optional calibration)


• Reference Frequency: 1.9 to 2.4 MHz


• Maximum Linear Velocity: 500 mm/s (with linear optics)


• Beam Diameter: 6 mm


• Beam Height: 79.5 mm


• Warm-up Time: Typical 4 minutes; up to 10 minutes standard; 90 minutes with connected vent fan


• MTBF: > 50,000 hours


• Power Supply: +15 V ±0.3 V at 2.5 A max; −15 V ±0.3 V at 0.02 A max


• Heat Dissipation: 23 W (operating); 35 W (warm-up)


• Operating Temperature: 0 to 40 °C


• Weight: 3.4 kg (7.5 lb)


• Laser Class: Class 2


• Polarization: Orthogonally polarized frequency components (f1 horizontal, f2 vertical)

Key Features

• Sub-nanometer wavelength stability over one-hour intervals (2 ppb vacuum)


• Integrated control unit simplifies system integration


• Multiple mounting options: three M8 × 1.25 tapped feet or six-hole base configuration (M6 or 1/4-20 UNC)


• Extended operating lifetime (> 50,000 hours MTBF)


• Compact packaging smaller than 5517A predecessor

Typical Applications

• Coordinate measuring machine (CMM) calibration


• CNC machine tool alignment and verification


• Laser displacement and position measurement systems


• Precision length standards and dimensional calibration


• Semiconductor manufacturing alignment


• Scientific metrology and research

Compatibility & Integration The 5517B operates with compatible receiver electronics (e.g., E1709A) to achieve specified maximum linear velocity. Kinematic mounting recommended for rear foot placement when not using aluminum mounting surfaces.