Gentec-eo QE and XLE4 Manuel d'utilisateur télécharger pdf (Page 27)

QE Series Joulemeter Instruction Manual Version 3.0 April 2014

light must be directed within the detector aperture and that the transmission loss

through the optical component must be known.

5- Adjust the oscilloscope to trigger on the joulemeter pulse or on the laser sync. signal.

6- Measure the foot to crest peak voltage generated by the joulemeter.

7- Determine the joulemeter Volt/Joule sensitivity from the detector identification label or calibration

certificate. Choose the value stated for the wavelength being used.

8- Calculate the optical energy using the following equation:

Energy = V

peak

/ Calibration sensitivity

Ex:

- V

peak

= 1 volt

- Detector calibration sensitivity (10 Volts / Joule)

Energy = 1 Volt / 10 V/J = 100 mJ

NOTE: Exclude any DC offset from the pulse peak value measurement; this offset is a function

of the repetition rate.

2.2.2 Working at other wavelengths than 1.064µm

For measurements with a QE Series

joulemeter at wavelengths other than 1.064µm, a

correction factor must be set to compensate for the change in sensitivity of the joulemeter

caused by the change in absorption of the optical absorber at different wavelengths.

To correct for the change in absorption refer to the spectral curve of the “ Personal

Wavelength Correction

“ certificate supplied for the joulemeter and calculate K by taking

the percentage difference between the absorption @1.064µm and that at the desired

wavelength.

 

μm064.1@





Energy = V

peak

/ Calibration sensitivity / K

Here

 



= Absorption of the QE

@ the desired wavelength.

 

μm064.1@A

= Absorption of the QE

@ 1.064µm

A sample calculation follows:

 



= 92 %.

 

μm064.1@A

= 94 %

K =

 

μm064.1@



x 100

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Gentec-eo QE and XLE4 Manuel d'utilisateur Page 27

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