UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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2024-11-22 2:38
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Conference: Bucharest University Faculty of Physics 2013 Meeting


Section: Optics, Spectroscopy, Plasma and Lasers


Title:
Set up for laser power calibration transfer


Authors:
Dan Sporea, Adelina Sporea, Laura Mihai


Affiliation:
National Institute for Laser, Plasma and Radiation Physics - Laser Metrology and Standardization Laboratory


E-mail
dan.sporea@inflpr.ro


Keywords:
calibration transfer, laser power, traceability


Abstract:
The paper reports a complex set up for the transfer of laser power calibration over a wide ranges of optical power levels, at multiple wavelengths. The laser sources used in this set up are: a Research Electro Optics multi wavelengths tunable He-Ne laser (λ = 543 nm/ 0.3 mW; 594 nm/ 0.6 mW; 604 nm/ 0.5 mW; 612 nm/ 2.5 mW; 633 nm/ 4 mW), a Continuum multi wavelengths tunable Ar+ laser (λ = 472.2 nm/ 60 mW; λ = 488.0 nm/ 1 W; λ = 496.5 nm/ 400 mW; λ = 514.5 nm/ 1.2 W), a set of free space laser diodes operating at λ = 635 nm/ 3 mW; 670 nm/ 3 mW; 780 mn/ 3 mW; 808 nm/ 5 mW. The calibration standards consist of a trap detector from Spectrum Detector Inc. and a dual channel laser power meter connected to thermopile and photodiode power meter heads. The operation wavelength of each calibration source was measured either with a Wavecheck lambda meter or a wavelength meter (calibrated at METAS – Switzerland). The calibration standards used have traceability to the manufacturer or to foreign national institutes of metrology (PTB – Germany, METAS – Switzerland and SP – Sweden). The stability of gas lasers output power was assured by a differential measurement or with a laser power controller from Brockton Electro-Optics Corp. The second approach enables also the continuous change of the optical power from 10 % to 85 % of the laser nominal power, with a long term stability of better than 0.03 %. The output power of the diode lasers and their operating wavelengths are controlled through a Newport 6000 Laser diode controller. This work was supported by the grant PN 09 39.07.01/ 2013 – Program NUCLEU of the Ministerul Educatiei Nationale - Unitatea de Stat pentru Cercetare Stiintifica, Dezvoltare Tehnologica si Inovare.