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1917 Einstein: Theory of induced emission
1928 Kopfermann and Ladenburg: Experiments on induced emission
1954 Gorden,Zeiger,Townes: First laser (1964 Nobel prize)
1960 Maimann: Ruby aser
1961 Johson and Nassau: Neodyme laser
1966 Sorokin and Lankard: Pulsed-dye laser
1979 Seipp (Germany): Argonlaser in dermatology
1982 Strempel: First Erster pulsed-dye laser in Germany (Aachen)
1992 More pulsed-dye lasers (also in Hamburg)
