Optical and electronic solutions for power stabilization of CO 2 lasers.

Autor: Childs C; Department of Physics and Astronomy, University of Nevada Las Vegas, Las Vegas, Nevada 89154, USA., O'Donnell W; Department of Physics and Astronomy, University of Nevada Las Vegas, Las Vegas, Nevada 89154, USA., Ellison PB; Department of Physics and Astronomy, University of Nevada Las Vegas, Las Vegas, Nevada 89154, USA., Shelton DP; Department of Physics and Astronomy, University of Nevada Las Vegas, Las Vegas, Nevada 89154, USA., Salamat A; Department of Physics and Astronomy, University of Nevada Las Vegas, Las Vegas, Nevada 89154, USA.
Jazyk: angličtina
Zdroj: The Review of scientific instruments [Rev Sci Instrum] 2020 Oct 01; Vol. 91 (10), pp. 103003.
DOI: 10.1063/5.0021156
Abstrakt: High pressure-temperature conditions can be readily achieved through the laser-heated diamond anvil cell (LH-DAC). A stable laser source is required for reliable in situ measurements of the sample, as the sample is small with a thermal time constant of the order of microseconds. Here, we show that the power instabilities typical of CO 2 gas lasers used in LH-DAC's are ±5% at the second timescale and ∼±50% at the microsecond timescale. We also demonstrate that the pointing instability of the laser requires either a diffuser or an integrating sphere for reliable total power measurements with small sized detectors. We present a simple solution for stabilizing the power of a CO 2 gas laser on the second timescale by the direct modulation of the current across the tube and another solution that stabilizes the power to the microsecond timescale by externally modulating the CO 2 laser beam. Both solutions can achieve a ±0.3% power stability.
Databáze: MEDLINE
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