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Making Measurements
Measuring Wavelength and Power
Total power and average wavelength
In the third available display mode, the Agilent 86120C displays the
average wavelength as shown in the following figure. The displayed
power level is the total input power to the instrument. It is the sum of
the powers of each laser line; it is not a measure of the average power
level of the laser lines.
The following equation shows how individual wavelengths of laser lines
are summed together to obtain the average wavelength value:
where,
n is the number of laser lines included in the average.
P
i
is the peak power of an individual laser line. Power units are in Watts (linear).
λ
avg
P
i
λ
i
i1=
n
P
i
i1=
n
--------------------
=