Abstract
The beam propagation factor, M2 of the master-oscillator power-amplifier (MOPA) CuBr laser emission compliant with ISO 11146 is studied methodically. Statistical parameters of 2D intensity profile of the near and far fields of MOPA laser radiation are measured by a beam analyzing technique as functions of timing delay between MO and PA. For first time the influence of the gas buffer (causing the radiation profile to change from annular to top-hat and Gaussian-like) and light polarization on CuBr laser beam focusability (M2) was under investigation. 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. 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. With polarized light, M2 drops to 3 at the end of gain curve. The brightness of laser emission with hydrogen goes up 3–5 times and the linearly-polarized beam is at least 40% brighter than that of partial or non-polarized beams.
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Astadjov D.N., Stoychev L.I., Dixit S.K., Nakhe S.V. and Sabotinov N.V. (2005). High-brightness CuBr MOPA laser with diffraction-limited throughout-pulse emission. IEEE J. Quantum Electron. 41: 1097–1101
Astadjov D.N., Vuchkov N.K. and Sabotinov N.V. (1988). Parametric study of the CuBr laser with hydrogen additives. IEEE J. Quantum Electron. 24: 1927–1935
Brown, D.J.W., Coutts, D.W.: Beam quality issues in copper vapour lasers. In: Little, C.E., Sabotinov, N.V. (eds.) Proceedings of NATO Advanced Research Workshop, St Andrews, August 1995, NATO ASI Series, 1. Disarmament Technologies. Pulsed Metal Vapour Laser, Vol. 5, pp. 241–254. Kluwer Academic Publishers, Dordrecht, Boston, London (1996)
Brown D.J.W., Withford M.J. and Piper J.A. (2001). High power, high brightness master oscillator power amplifier copper laser system based on kinetically enhanced active elements. IEEE J. Quantum Electron. 37: 518–524
Chang J.J. (1994). Time-resolved beam-quality characterization of copper-vapour lasers with unstable resonators. Appl. Opt. 33: 2255–2265
Chang J.J. (1995). Copper-laser oscillator with adjoint-coupled self-filtering injection. Opt. Lett. 20: 575–577
Chang, J.J., Warner, B.E., Boley, C.D., Dragon, E.P.: High-power copper vapour lasers and applications. In: Little, C.E., Sabotinov, N.V. (eds.) Proceedings of NATO Advanced Research Workshop, St Andrews, August 1995, NATO ASI Series, 1. Disarmament Technologies. Pulsed Metal Vapour Laser, Vol. 5, pp. 101–112. Kluwer Academic Publishers, Dordrecht, Boston, London (1996)
Coutts D.W. (2002). Double-pass copper vapour laser master-oscillator power-amplifier systems: generation of flat-top focused beams for fiber coupling and percussion drilling. IEEE J. Quantum Electron. 38: 1217–1224
Dixit S.K. (2001). Filtering resonators: a historical perspective. In: Dixit, S.K. (eds) Filtering resonators, pp 1–12. Nova Science Publishers, Huntington, New York
Dixit S.K., Singh B., Mittal J.K., Choube R. and Bhatnagar R. (1994). Analysis of the temporal and spatial characteristics of the output from short-inversion-time self-terminating lasers with various resonators. Opt. Eng. 33: 1908–1920
Giao M.A.P., Miyakawa W., Rodrigues N.A.S., Zezell D.M., Riva R., Destro M.G., Watanuki J.T. and Schwab C. (2006). High beam quality in a HyBrID copper laser operating with an unstable resonator made of a concave mirror and a plano-convex BK7 lens. Opt. Laser Technol. 38: 523–527
Guyadec E.Le., Countance P., Bertrand G. and Peltier G. (1999). A 280-W average power Cu–Ne–HBr laser amplifier. IEEE J. Quantum Electron. 35: 1616–1622
ISO 11146: Lasers and Laser-related Equipment—Test Methods for Laser Beam Parameters—Beam Widths, Divergence Angle and Beam Propagation Factor. International Organization of Standardization (2005)
OmPrakash Tiwari, G.N., Dixit S.K. and Bhatnagar R. (2003). Single-pulse time-resolved comparative study on the performance of a master-oscillator, power-amplifier copper-vapor-laser system with generalized diffraction-filtered and unstable resonators as master oscillators. Appl. Opt. 42: 3538–3545
Salimbeni, R.: Beam quality issues in CVL applications. In: Little, C.E., Sabotinov, N.V. (eds.) Proceedings of NATO Advanced Research Workshop, St Andrews, August 1995, NATO ASI Series, 1. Disarmament Technologies. Pulsed Metal Vapour Laser, Vol. 5, pp. 229–240. Kluwer Academic Publishers, Dordrecht, Boston, London (1996)
Siegman A.E. (1997). OSA Annual Meeting, Tutorial presentation. Long Beach, California
Siegman, A.E.: How to (maybe) measure laser beam quality. Available via DIALOG. http://www.stanford.edu/~siegman/beam_quality_seminar.pdf. Cited 31 July 2007 (2004)
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Astadjov, D., Stoychev, L. & Sabotinov, N. M2 of MOPA CuBr Laser Radiation. Opt Quant Electron 39, 603–610 (2007). https://doi.org/10.1007/s11082-007-9113-5
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DOI: https://doi.org/10.1007/s11082-007-9113-5