Appendix b: using the xlp12 with the xlp12 filter, Fig. 1-15 xlp12 filter specifications – Gentec-EO UP and XLP12 User Manual

Page 39

Version 5.0

Ultra Series UP Instruction Manual

Appendix B: Using the XLP12 with the XLP12 filter:

The XLP12 filter features ease of installation and removal. To use an XLP12 series wattmeter
(@ any wavelength) with the XLP12 filter, the user must calibrate the assembly using the
following procedure:

Step 1: Set up the XLP12 wattmeter without the filter to measure the power of your laser. Adjust
the sensitivity of the wattmeter to your working wavelength. Verify that the power level is below
the detector’s damage threshold and that the laser has a good stablity.

Step 2: Warm up the detector by applying power to it for a few minutes. This will reduce thermal
bias.

Step 3: Measure the power level (without the filter). To reduce random uncertainty, we
recommend taking the average of 5 distinct measurements.

Step 4: Install the filter. Without changing the laser settings, measure the power level by
averaging the same number of distinct measurements as in Step 3. All laser settings remain
identical as in Step 3, including beam size and position on detector.

Step 5: Repeat the first measurement (Step 3)

to verify that there hasn’t been any change

during the procedure that would invalidate the calibration. A difference that is larger than the
uncertainty of your measurement means that something in the laser or environment changed.
You may add this to your



uncertainty when using the filter or you may try stabilizing the laser

and environment and repeat from Step 3.

The correction multiplier for the Duo (rev 2.0) and the Solo will be given by:

Reading without attenuator

(no units)

Reading with attenuator



The correction factor for the Duo (prior to rev 2.0) will be:

100

(%)



Now use calibration factor F

for the filter when using it at the wavelength established in Step

XLP12 Filter

Spectral Range

280 nm

– 1.36 µm

Typical Transmittance (@ 1.064 µm)

93 %

Typical Reflectance (@ 1.064 µm)

7 %

Dimensions (installed in own mount and

XLP12, ext.



x thickness)

1.2 ‘’ x 1/3 ‘’

FIG. 1-15 XLP12 FILTER SPECIFICATIONS