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5.4.4
Laser Rough Adjustment 2
1
Adjusting the AOTF driver
Refer to the data sheet provided with the laser unit. Adjust and register the frequency and power
settings of the AOTF driver for the four wavelengths of the Ar laser, the wavelength of each of the
green HeNe laser and the 561-nm solid-state laser (and 405-nm (440-nm) laser and 638-nm laser for
LU4A).
In this section, an example case is explained. (The case for the 457-nm wavelength of the Ar laser is
explained.)
Figure 5.4-77
Figure 5.4-78
Figure 5.4-79
Chapter 5 Laser Unit
5.4 LU4A Four-laser Module A
1.
Select the line one [L1] with the AOTF driver remote
controller.
2.
Manually open the L3 laser shutter.
3.
Press the [1] key on the AOTF remote controller and
the display changes as shown in Figure 5.4-78.
Set the power to 18 dB on the AOTF remote
controller.
Subject the sensor of the power meter to the laser
light from the AOTF. Refer to the AOTF data sheet
provided with the laser unit and adjust the frequency
by pressing arrow keys (< and >) so that the laser
power value of the power meter becomes the
maximum. Keep pressing the arrow key to
consecutively or incrementally increase or decrease
the figure.
Note:
When performing frequency control, keep in
mind that if a horizontal arrow is kept pressed,
the figure will increase/decrease very quickly
after the increase or decrease balance exceeds 2
MHz.
The frequency value on the data sheet is only a
guide. The optimum frequency value varies
depending on the incidence angle and wavelength of
the laser light emitted to the AOTF.
When some steps of the frequency value cause the
same maximum power, the lowest frequency value is
used.
To select another wavelength number, press the key
assigned to it.
1-183
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