Gentec-EO S-LINK - Manual (Page 52)

S- LINK User’s Manual Revision 2.4 47
5 Appendix A
5.1 Attenuator/Diffuser Calibration Procedure
Introduction;
These “Attenuator/Diffusers” must be user calibrated for wavelengths other than the calibration
wavelength (typically 1.064µm).
The calibration procedure is relatively easy. First measure without the attenuator, then with the
attenuator. The ratio of these measurements will be your correction.
When using an oscilloscope;
Divide the joulemeter voltage output by the calibration sensitivity we provide to calculate the energy
reading (see joulemeter manual).
To use this procedure at a wavelength other than the wavelength stated on the calibration certificate,
manually adjust the sensitivity value (of the cal. certificate) with the wavelength correction multiplier
from the Personal Wavelength Correction certificate. Use this wavelength-adjusted sensitivity to calculate
the energy readings used in the procedure that follows.
When using a Gentec-EO S-Link;
In the Control menu there should be no check mark in the Attenuator setting. It must be off to access
the wavelength correction (Settings  Corrections menu. You need this to input the wavelength that you
are calibrating at (see monitor manual). The Attenuator setting should be checked off if you are redoing a
calibration at the same wavelength as stated on the joulemeter calibration certificate.
Procedure:
Step 1: Setup your joulemeter to measure the energy of your pulsed laser. If you are working at a
wavelength other than the calibrated wavelength, adjust the sensitivity of your joulemeter for that
wavelength; see When using an oscilloscope or When using a Gentec-EO S-Link or Duo monitor, above.
Ensure that the energy level is below the d
etector’s damage threshhold and your laser is still stable.
Step 2: Apply energy for a few minutes to warm up the detector. This will reduce any thermal bias.
Step 3: Measure the energy level without the attenuator. To reduce random uncertainty, average a
number of shots. We recommend at least one hundred shots. This should reduce random errors by a
factor of 10. (Square root of “n” assuming Gaussian distribution)