Laser transient induced by a pumping step t Ip Case of HeNe :  and  c same order of magnitude n0n0 Laser intensity  n th nn.

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Presentation transcript:

Laser transient induced by a pumping step t Ip Case of HeNe :  and  c same order of magnitude n0n0 Laser intensity  n th nn

Laser transient induced by a pumping step t Ip Case of Nd:YAG:  >>  c spiking  =230µs  c =22ns n0n0 Laser intensity  n th nn

Zoom on the first spike

Laser transient induced by a pumping step t Ip Case of Nd:YAG:  >>  c spiking  =230µs  c =33ns relaxation oscillations n0n0 Laser intensity  n th nn

 n always in steady state 1/R 1 R 2 R 3 n0n0 Laser intensity  n th nn In case of HeNe, approximation correct Comparison with hypothesis chapter 3

 n always in steady state 1/R 1 R 2 R 3 In case of Nd:YAG, approximation not correct Comparison with hypothesis chapter 3

Q-switched regime E1E1 E2E2 Lower level Upper level E0E0 Fundamental level Amplifying medium Pumping Spontaneous emission Switch off Energy storage in the upper level Cavity blocked : high losses, no laser action

E1E1 E2E2 Lower level Upper level E0E0 Fundamental level Amplifying medium Pumping Switch on Q-switched regime Energy storage in the upper level Laser pulse

Q-switched regime E1E1 E2E2 Lower level Upper level E0E0 Fundamental level Amplifying medium Pumping Switch on Energy storage in the upper level Cavity draining

Q-switched regime and spiking

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