Four laser heads are available for different size, velocity, and interface requirements.The Keysight 5517 series of laser heads provides choices for all available size and velocity requirements in a consistent interface. The 5517A is the basic laser head. The 5517B offers 25% greater axis velocity in a smaller package. The 5517C offers still higher velocity, 75% higher than the 5517A. The 5517D offers the highest axis velocity and is the same size as the 5517B.
Standard beam diameter is 6 mm. In addition, there are two beam size options available for the 5517C. Option 003 provides a 3-mm beam diameter for use with the Keysight 10719A and 10721A differential interferometers and 10737L/R compact three-axis interferometers. Option 009 provides a 9-mm beam diameter for use with the 10735A and 10736A three-axis interferometers. The larger beam allows these interferometers a larger angular range of measurement.
Finally, the Keysight 5501B laser head is available to replace the previous 5501A laser head in existing applications that require the same polarization, cabling, and electrical power as the 5501A. The 5501B also offers improved accuracy, reliability, and serviceability compared to the previous 5501A.
All laser heads use a proven long-life laser tube with a demonstrated Mean Time Between Failure greater than 50,000 hours of operation, making them the most reliable lasers of their type available.