9-6 Coherence Control
Press the coherence control key.
(This key toggles ON/OFF of the coherence control.)
When the key is pressed, the coherence control LED is lit, to show that the coherence control is
ON. To turn OFF the coherence control, press the coherence control key once again.
9-6-A Variable Coherence Control
By utilizing an external cavity structure in the design, the TSL-210 makes the most of the char-
acteristics of a semiconductor laser. The greatest of these characteristics is the improvement of
spectrum purity. However, when spectrum purity is improved, interference distance becomes
longer, and interference by a slight reection point somewhere in a test set-up may deteriorate
the quality of the measurement system. To solve such a problem, the TSL-210 has a spectrum
linewidth control function, the Coherence Control. The Coherence Control, in a sense, puts
noise on a light source. If its level becomes strengthened too much, it becomes a noise signal.
To optimize the effects of the Coherence Control, it is best to be able to control in small incre-
ments. The standard model only has a single Coherence Control setting.
In the Variable Coherence Control option, a volume knob is attached to the option panel on the
rear panel. Turning the knob clockwise makes the level larger. Adjust the level by turning the
adjustment potentiometer. The level and control amount does not necessarily appear linear.
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