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Absolute measurement of F2-laser power at 157 nm

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Abstract

We report a comparison of laser power measurements at the F 2-laser wavelength of 157  nm made at two facilities of the Physikalisch-Technische Bundesanstalt (PTB), the German national metrology institute. At the PTB laboratory at the electron storage ring BESSY II in Berlin, the scale for laser power was directly traced to a cryogenic radiometer operating at 157  nm, whereas at the PTB laser radiometry facility in Braunschweig the calibration of transfer detectors was performed with a newly developed standard for laser power at 157  nm, which is traceable in several steps to a cryogenic radiometer operating at 633  nm. The comparison was performed under vacuum conditions with laser pulse energies of 10  μJ, however with different average powers because different primary standard radiometers were used. The relative deviation for the responsivity of the transfer detector was 4.8% and thus within the combined standard uncertainty.

© 2006 Optical Society of America

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