Phase compensation using acousto-optic programmable dispersive filter

Abstract

scheme of future high power laser. Output energy is estimated to be 5 kJ for 3-ns-longpulses. A oscillator is pumped by two cw laser diodes. Stable modelocked pulses were obtained by a solid-state saturable absorber and prism pairs for dispersion compensation. Autocorrelation of the output pulses is shown in Fig. 2. Temporal wave form is well defined by sech' function of 151 fs. Spectrum width is 8.7 nm (2.6 THz). Product (6t X 6v) is 0.39 and nearly Fourier transfer limited. The operation stability was tested for 16 hours. The fluctuation of oscillation wavelength is 20.15 nm and much smaller compared with gain spectrum of the Nd:glass laser. The main amplifier of the new beamline consists of four disk amplifiers with 350-mm aperture in Cassegrain type 3 pass geometry. Each disk amplifier has two LHG-80 disks (694 X 380 X 45). Laser disks are pumped by flashlamps from two sides. The maximum pump energy is about 400 kJ. The performance of the disk amplifier was measured. Small signal gain and pumping efficiency were 1.88 and CFK4 U 3 0 am