5517A 5517B 5517C 5517D Agilent laser head

Description

5517A 5517B 5517C 5517D Agilent laser head

Product Information Manual
The Keysight Technologies, Inc. 5517 series is a Class II helium neon laser source that provides highly stable and accurate 633 nm wavelength light for precision dual frequency interferometry measurements.
Various Zeeman splitting frequencies, beam sizes, power levels, and special options can meet your system requirements. Shide Technology Laser is renowned for its reliability, with an average time between failures (MTBF) typically exceeding 50000 hours.
Main features
-2 ppb vacuum wavelength stability (1 hour); 20 ppb (lifetime)
-± 0.1 ppm wavelength accuracy standard; ± 0.02 ppm, optional calibration
-MTBF>50000 hours (typical value)

The Keysight Technologies, Inc. 5517 series are Class II helium-neon lasers sources that provide highly stable and accurate 633 nm wavelength light for precision dual-frequency interferometry. A variety of Zeeman split frequencies, beam size, power levels, and special options are available to meet your systems requirements. Keysight lasers are known for their reliability, with a mean time between failures (MTBF) of greater than 50,000 hours typical.

Number of Measurement Axes
5-4 User’s Manual Before the laser beam leaves the laser head, part of it is sampled to determine the difference frequency between its two optical components. This difference frequency is called the Reference Frequency or Split Frequency. The beam leaving the laser head is directed through a configuration of beam-directing optics and measurement optics and then to a receiver. The receiver provides a Measurement Frequency, which, when compared to the Reference Frequency from the laser head, yields displacement information. If a measurement axis is used for wavelength tracking instead of a displacement measurement, its Measurement Frequency yields wavelength-of-light information instead of displacement information.

Number of Measurement Axes

The output from a single laser head can be used for measurements involving many axes of motion, plus the wavelength tracking compensation axis. The number of axes that can be measured depends on the optical power available from the laser head and the optics and system measurement electronics being used.

Accuracy Considerations

The wavelength of light from the laser head serves as the length standard for Agilent laser measurement systems. Since the laser transition of the neon atom provides a fundamental physical reference, the Agilent interferometric system is considered a “primary standard” for metrology.

The standard long-term wavelength accuracy (in a vacuum) of Agilent laser heads is 0.1 part-per-million (1 × 10-7 ) or 0. 1 micron per meter (0. 1 microinch per inch). It is customary to specify laser accuracy in vacuum because the variable characteristics of air (such as temperature, humidity, pressure, and gas mixture) have a significant effect on the wavelength of light.

As with any measuring device, improper installation or operation can degrade measurement accuracy. Before installing the equipment, you should study the basic measurement capabilities of the system, along with considerations of relevant sources of errors. Many potential problems that could be encountered during installation and initial operation can be avoided by careful planning and a thorough understanding of laser interferometry.

Motion of the receiver or laser head along the beam path (X) has no effect on the measurement, since both f1 and f2 would exhibit Doppler shift. Small motions of the laser head, receiver, interferometer, or retroreflector in a direction perpendicular to the beam path (Y or Z) have no effect on the measurement. The only restriction is that sufficient light returns to the receiver.

Angular motion of the laser head about the Z or Y axis has the effects described below:

• It introduces a measurement error (cosine error).

• It may displace the laser beam so that insufficient light returns to operate the receiver.

Related models: 5517A, 5517B, 5517C, 5517CL, 5517D, 5517DL, 5517EL, 5517FL, 5517GL