Pulse stretching of Q-switched lasers

227-W Q-switched self-doubling Yb:YAB laser with controllable pulse length

“…In fact Kalashnikov 16 calculated that with the addition of an intracavity stimulated Raman scattering process, pulses could be shortened by up to 1 order of magnitude if the initial saturable absorption and the Q-factor were controlled at both the fundamental and Raman wavelengths. Kalashnikov does not report on overcoupling or pulse lengthening, although this effect has been demonstrated by use of Raman, 17 Rayleigh, 18 and Brillouin scattering, 19 as well as two-photon absorption. [20][21][22] We report here detailed experimental and numerical studies of Q-switched intracavity self-doubled operation of Yb:YAB.…”