6.2 Generation of short laser pulses by Quality factor (Q) switching. (a) What is the energy...

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6.2 Generation of short laser pulses by Quality factor (Q) switching. (a) What is the energy Ep and power Pp of a Q-switched laser pulse (hint: use energy balance with An the inversion built up until Q-factor is switched, V volume of optically active material in resonator, tp pulse duration). Estimate maximum Ep and Pp for given number density nion of optically active ions in the amplifier (e.g. Nd:YAG crystal): nion = 109 cm, = 1064 nm, tp 10 ns, V = 1 cm). This laser pulse is focused to a spot of area A = 1 mm. Calculate the laser energy density (fluence) and intensity in the spot. (d) Is pulse duration tp in Q switching independent on photon storage time in resonator Tres. (b) (c) 6.2 Generation of short laser pulses by Quality factor (Q) switching. (a) What is the energy Ep and power Pp of a Q-switched laser pulse (hint: use energy balance with An the inversion built up until Q-factor is switched, V volume of optically active material in resonator, tp pulse duration). Estimate maximum Ep and Pp for given number density nion of optically active ions in the amplifier (e.g. Nd:YAG crystal): nion = 109 cm, = 1064 nm, tp 10 ns, V = 1 cm). This laser pulse is focused to a spot of area A = 1 mm. Calculate the laser energy density (fluence) and intensity in the spot. (d) Is pulse duration tp in Q switching independent on photon storage time in resonator Tres. (b) (c)

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