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5501B Laser Head

Product Status: Obsolete | View Service Options
This product is no longer available

A replacement for this product is available:


The Keysight 5501B laser head, used in Keysight interferometer systems, offers a vacuum wavelength accuracy (3 &sigma, lifetime) of 0.1 ppm, and a standard beam diameter of 6 mm. The laser head uses a proven long-life laser tube and includes a reference receiver and high voltage power supply. The 5501B is a drop-in replacement for the Keysight 5501A laser head. The 5517 family of laser heads should be considered for new applications.

The Keysight 5501B is configured with appropriate optics and system electronics to build a laser interferometer system that meets the unique physical layout and measurement requirements of individual applications. The custom positioning system improves product quality, increases yields, and facilitates manufacture of precision products.

  • Weight: 3.4 Kg (7.5 pounds)
  • Magnetic field strength (Non-Operating): Does not exceed 5.25 milligauss at a distance of 4.6 m (15 ft) from any point on the surface of the packaged Laser Head.
  • Clearance required for cabling: 10.16 cm (4 in) beyond back
  • Power Input Requirements: +15 V ±0.3 V at 0.79 A maximum =15 V ±0.3 V at 0.67 A maximum
  • Heat Dissipation: 23 W during operation, 35 W during warmup
  • Beam power output: 1 milliwatt maximum, 180 microwatts minimum
  • Beam diameter: 6 mm (0.25 inch) typical
  • Vacuum wavelength stability: 0.002 ppm typical 1 hour 0.02 ppm typical lifetime
  • Nominal vacuum wavelength: 632.991372 nanometers
  • Safety classification: Class II Laser Product conforming to U.S. National Center for Devices and Radiological Health Regulations 21 CFR 1040.10 and 1040.11.
  • Reference Frequency: 1.5 MHz to 2.0 MHz
  • Helium-neon, continuous wave, two-frequency laser
  • Fast warm-up (typically four minutes)
  • Compact package adds configuration versatility
  • Industry-leading reliability