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The laser parameters such as an inversion density, a stimulated transition cross section and a loss factor in the glass laser amplifier medium were experimentally determined. Using these values, the rate equations of Baser amplifier were solved with various input pulse forms. To get extremely high output power, it is necessary to send a very steep input pulse into an amplifier. An experiment of two-stage amplifier was performed and the maximum output power obtained was 1.1 GW, which well agreed with calculations. The various problems in amplification were considered. To get larger power, the mode locked laser was prepared. The SeOCl2-Nd3+ liquid laser seems to be more durable against a damage of laser rod. An experiment of laser amplifier consisting of glass and SeOCl2 lasers was performed. The sufficient gain could be obtained even if the center spectrum of the SeOCl2 laser was about 50 Å shorter than that of the glass Baser.