M2-factor for MOPA CuBr laser system

Dimo N. Astadjov; Lyubomir I. Stoychev; Nikola V. Sabotinov

doi:10.1117/12.726991

5 March 2007 M²-factor for MOPA CuBr laser system

Dimo N. Astadjov, Lyubomir I. Stoychev, Nikola V. Sabotinov

Proceedings Volume 6604, 14th International School on Quantum Electronics: Laser Physics and Applications; 66040Z (2007) https://doi.org/10.1117/12.726991
Event: 14th International School on Quantum Electronics: Laser Physics and Applications, 2006, Sunny Beach, Bulgaria

Abstract

M²-factor of the master-oscillator power-amplifier (MOPA) CuBr laser emission compliant with ISO 11146 is studied for first time. M² is an invariant that gives how many times diffraction-limited is a laser beam compared to a perfect Gaussian TEM₀₀ beam. Statistical parameters of the near and far fields of MOPA laser radiation are measured by a beam analyzing technique. Two patterns of the MOPA laser emission are examined: annular that is typical for lasers without addition of hydrogen, and of filled-center (top-hat and Gaussian-like) with addition of hydrogen. 2D intensity profile changes of the near and far fields are recorded as functions of delay time of laser excitation current pulses. The MOPA gain curve is found and the influence of gain on the input signal (from MO into PA) due to the absorption/amplification in PA on the field profiles is shown. The change of position and waveform of laser pulses is given too. For annular radiation M² range is from 13-14 (small delays) to 5-6 (large delays) and for filled-center radiation M² is 6-7 (small delays) and at the end of gain curve is as much as 4.

Citation Download Citation

Dimo N. Astadjov, Lyubomir I. Stoychev, and Nikola V. Sabotinov "M²-factor for MOPA CuBr laser system", Proc. SPIE 6604, 14th International School on Quantum Electronics: Laser Physics and Applications, 66040Z (5 March 2007); https://doi.org/10.1117/12.726991

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