Agilent HP 5517C CHAPTER 5 USER free download

File name HP 5517C CHAPTER 5 USER.pdf

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 Shut