The Non-Mode-Locked Picosecond Laser
In the present paper we report the first application of the re generative compression technique to the self-injected Nd-YAG laser to generate band-limited picosecond pulses [1,2]. With this technique we are able to reduce the typical 30 nanosecond pulse duration of a normal Pockets Cell Q-switched laser down to less than 6ps, realizing a pulse compression by about 3 orders of magnitude. This is achieved by first stepping down the Q-switched pulse to a seed pulse about lns long using the self-injection (i.e. cavity flipping) technique. Then this seed pulse is amplified by the active medium and, at the same time, undergoes a further compression due to the nonlinear transmission characteristics of a saturable dye flowing in a cell inserted in the laser cavity. Since the shortening process is quasi-adiabatic, very high pulse peak power can be obtained, limited basically by damage to the optical components and by effects of nonlinear loss and self actions arising in the active medium . In addition to that, the system has very good stability characteristics.
KeywordsCoherence Rhodamine Dichloroethane Chloroethane
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