Abstract
The importance of laser guide stars to the practical usefulness ofadaptive optics cannot be understated, and yet there are veryfew working systems.This contribution discusses the current status of the ALFAlaser guide star, with regard to the particular difficulties encounteredwhile observing as well as both the expected performance and that so farachieved from scientific observations.A description is given of a number of experiments involving ALFA whichaim to determine the atmospheric turbulence and sodium layercharateristics, and demonstrate the possibility for tilt recovery fromlaser guide stars.
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Ageorges, N., Hubin, N. and Redfern,M.: 1999, ‘Atmospheric Sodium Column Density Monitoring’. in Astronomy with Adaptive Optics.
Davies, R., Hackenberg, W., Ott, T., Holstenberg, H.-C., Rabien, S., Quirrenbach, A. and N. Wilnhammer, N.: 1998a, ‘ALFA: First Operational Experience of the MPE/MPIA Laser Guide Star System for Adaptive Optics’. in D. Bonaccini and R. Tyson (eds.), Adaptive Optical System Technology 3353, pp. 116–124.
Davies, R., Hackenberg, W., Ott, T., Rabien, S., Eckart, A., Hippler, S. and Kasper, M.: 1998b, ‘Observational Results from ALFA with Natural and Laser Guide Stars’. in Astronomy with Adaptive Optics.
Davies, R., Hackenberg, W., Ott, Y., Eckart, A., Rabien, S., Anders, S. Hippler, S., Kasper, M., Kalas, P., Quirrenbach, A. and Glindemann, A.: 1999, ‘The Science Potential of ALFA: Adaptive Optics with Natural and Laser Guide Stars’, A&A 138, 1.
Delplancke, F., Ageorges, N., Hubin, N. and O'Sullivan, C.: 1999, ‘LGS Light Pollution Investigation at Calar Alto’, in Astronomy with Adaptive Optics.
Eckart, A. et al.: 2000, ‘ALFA: theMPIA/MPE laser guide star AO system’, Experimental Astronomy 10(1), 1–3 (Introduction, this issue).
Esposito, S. et al.: 2000, ‘Absolute tilt from a laser guide star: a first experiment’, Experimental Astronomy 10(1), 135–145 (this issue).
Foy, R., Migus, A., Biraben, F., Grynberg, G., McCullough, P. and Tallon, M.: 1995, ‘The Polychromatic Artificial Sodium Star: A New Concept for Correcting the Atmospheric Tilt’, A&AS 111, 569.
Fried, D.: 1965, JOSA 55, 1427.
Ge, J., Angel, J., Jacobsen, B., Roberts, T., Martinez, T., Livingston, W., McLeod, B., Lloyd-Hart, M., McGuire, P. and Noyes, R.: 1997, ‘Mesosphere Sodium Column Density and Laser Guide Star Brightness’, in N. Hubin (ed.), Laser Technology for Laser Guide Star Adaptive Optics Astronomy 55, pp. 10–15.
Ge, J., Jacobsen, B., Angel, J., McGuire, P., Roberts, T., McLeod, B. and Lloyd-Hart, M.: 1998, ‘Simultaneous Measurements of Sodium Column Density and Laser Guide Star Brightness’, in: Adaptive Optics System Technologies 3353, pp. 242–253.
Giovanelli, R. and Haynes, M.: 1985, ApJ 292, 404.
Greenwood, D.: 1977, JOSA 67, 390.
Hillenbrand, L., Meyer, M., Strom, S. and Skrutskie, M.: 1995. AJ 109, 280.
Hippler, S., Glindemann, A., Kasper, M., Kalas, P, Rohloff, R.-R., Wagner, K., Looze, D. and Hackenberg, W.: 1998, ‘ALFA: The MPIA/MPE Adaptive Optics with Lasers for Astronomy Project’, in D. Bonaccini and R. Tyson (eds.), Adaptive Optics System Technologies 3353, 44–55.
Kasper, M. et al.: 2000, ‘ALFA: Adaptive optics for the Calar Alto Observatory-optics, control system, and performance’, Experimental Astronomy 10(1), 49–73 (this issue).
Knapen, J.: 1999, ‘Observations of Barred Galaxies’, in J. Beckmand and T. Mahoney (eds.), The Evolution of Galaxies on Cosmological Timescales.
Noll, R.: 1976, JOSA 66, 207.
O'Sullivan, C., Redfern, M., Ageorges, N., Holstenberg, H.-C., Hackenberg, W., Rabien, S., Ott, T., Davies, R. and Eckart, A.: 1999, ‘The Mesospheric Sodium Layer At Calar Alto, Spain’, in Astronomy with Adaptive Optics.
O'Sullivan, C. et al.: 2000, ‘Short timescale variability of the mesopheric sodium layer’, Experimental Astronomy 10(1), 147–156 (this issue).
Ott, T. et al.: 2000, ‘The ALFA laser: beam relay and control system’, Experimental Astronomy 10(1), 89–101 (this issue).
Rabien, S., Davies, R., Hackenberg, W., Eckart, A. and Ott, T.: 1999, ‘Analysis Tools and Beam Relay System for the ALFA Laser’. in Astronomy with Adaptive Optics.
Rabien, S. et al.: 2000, ‘The ALFA laser and analysis tools’, Experimental Astronomy 10(1), 75–88 (this issue).
Ragazzoni, R., Esposito, S. and Marchetti, E.: 1995, ‘Auxiliary Telescopes for the Absolute Tip-Tilt Determination of a Laser Guide Star’, MNRAS 276, P76.
Ridgway, S.: 1998, ‘Scientific Porgrams in Adptive Optics-An Overview and Commentary’, in D. Bonaccini and R. Tyson (eds.), Adaptive Optical System Technology 3353, pp. 438–446.
Rousset, G.: 1994, ‘Wavefront Sensing’, in D. Alloin and J.-M. Mariotti (eds.), Adaptive Optics for Astronomy 423 of ASI, pp. 115–137.
Viard, E. et al.: 2000, ‘Rayleigh scattering and laser spot elongation problems at ALFA’, Experimental Astronomy 10(1), 123–133 (this issue).
Wirth, A., Navetta, J., Looze, D., Hippler, S., Glindemann, A. and Hamilton, D.: 1998, ‘Real-Time Modal Control Implementation for Adaptive Optics’, Appl. Optics 37(21), 4586–4597.
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Davies, R., Eckart, A., Hackenberg, W. et al. The ALFA Laser Guide Star: Operation and Results. Experimental Astronomy 10, 103–121 (2000). https://doi.org/10.1023/A:1008165517543
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DOI: https://doi.org/10.1023/A:1008165517543