Text preview for : HP 5517C CHAPTER 5 USER.pdf part of Agilent HP 5517C CHAPTER 5 USER Agilent HP 5517C User HP 5517C CHAPTER 5 USER.pdf
Back to : HP 5517C CHAPTER 5 USER.p | Home
5
Laser Heads
Chapter 5 Laser Heads
General
General
One laser head is required in most measurement systems, regardless of
the number of measurement axes in the system.
The wavelength of light from the laser head is used as the length
standard for Agilent laser measurement systems. The laser head
generates a coherent (all light waves in phase), collimated (all waves
traveling parallel to one another), light beam consisting of two
orthogonally polarized frequency components. To differentiate between
the frequencies, the lower frequency is identified as f1 and the higher
as f2.
The difference between these two frequencies is the "Reference
Frequency", listed in Table 5-1.
Agilent offers several laser head models to fill a variety of
requirements. A summary listing of Agilent laser heads is provided in
Table 5-1.
In addition to system information for the laser heads, complete
descriptions, equipment supplied information, and specifications for
each laser heads are given in this chapter.
Each of these laser heads requires a cable to connect it to the
measurement system electronics. Cables are listed in Chapter 9,
"Accessories," of this manual.
Table 5-1. Laser Heads Summary
Agilent Reference Beam
Model Requency Diameter Polarization Indicators Shutter
5517A 1.5 MHz to 6 mm f1 Horiz LASER ON Open, reduced,
2.0 MHz f2 Vert READY closed
5517B 1.9 MHz to 6mm f1 Horiz +15V POWER ON Open, reduced
2.4 MHz f2 Vert -15V POWER ON closed
LASER ON
READY
5517C 2.4 MHz to 6 mm (std) f1 Horiz +15V POWER ON Open, reduced
3.0 MHz 3 mm (5517C-003) f2 Vert -15V POWER ON closed
9 mm (5517C-009) LASER ON
READY
5-2 User's Manual
Chapter 5 Laser Heads
Frequencies and Polarizations
Table 5-1. Laser Heads Summary (Continued)
Agilent Reference Beam
Model Requency Diameter Polarization Indicators Shutter
5517D 3.4 MHz to 6 mm f1 Horiz +15V POWER ON Open, reduced
4.0 MHz f2 Vert -15V POWER ON closed
LASER ON
READY
5519A 2.4 to 6 mm f1 Horiz LASER ON Turret ring
3.0 MHz f2 Vert SIGNAL configures for
READY straightness or
other measurement
5519B 3.4 to Same as 5519A Same as Same as 5519A Same as 5519A
4.0 MHz 5519A
F1 is the lower frequency, and f2 is the higher frequency. The Agilent 5517A is the basic laser head.
The Agilent 5517B, Agilent 5517C, and Agilent 5517D are smaller
packages than the Agilent 5517A.
The Agilent 5517B, Agilent 5517C, and Agilent 5517D have higher
reference frequencies than the Agilent 5517A. The higher frequencies
allow higher axis velocity capability, depending on the electronics used.
The Agilent 5519A and Agilent 5519B are designed to be used as a part
of the Agilent 5529A Dynamic Calibrator system. The Agilent 5519B
has a higher frequency that the Agilent 5519A. The higher frequency
allows higher axis velocity capability.
Frequencies and Polarizations
Agilent laser heads produce a coherent, collimated, two-frequency laser
beam consisting of two orthogonally polarized frequency components.
Frequencies f1 (the lower frequency) and f2 are always orthogonally
polarized with respect to one another. However, either may be
vertically (or horizontally) polarized. Agilent laser heads have f1
horizontally polarized. Polarization affects the direction sense. For
example, if