9-5-A. Internal Control
Press the option key. (This key toggles the ne tuning control ON/OFF.) When this key is
pressed, the option LED is lit. Wavelength display changes into ne tuning display. The initial
value is 0.00. Make sure that the rotary encoder wavelength setting LED is lit.
If the LED is not lit, change the rotary encoder change key (toggle action) to the wavelength
side.
When the wavelength setting LED is lit, the ne tuning amount may be set within the range
–100 to + 100 by the rotary encoder. Almost perfectly continuos tuning of wavelength is
available. During ne tuning control, the coarse tuning is not available (rotation of the dif-
fraction grating). To turn OFF the ne tuning control, press the option key once again. When
it is turned off, the control amount returns to the initial value of 0.00, and the external cavity
changes back to it’s original length.
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