Amplification of Pulsed Single-Frequency Lasers
Regarding the amplification of pulsed single-frequency laser, the seed laser is generally obtained by modulating the output of a CW single-frequency laser with an electro-optic modulator (EOM) or acousto-optic modulator (AOM). As we discussed in Sect. 5.3, besides the disadvantage of compromised power, externally modulating CW laser could flexibly adjust the pulsing parameters such as pulse width and repetition rate. Therefore, the configuration of external modulation combines with MOPA that is beneficial for achieving high average/peak power single-frequency pulsing laser with adjustable parameters. Meanwhile, although it is feasible to realize relatively high average/peak power from a single Q-switched fiber resonator, by exploiting the high gain of heavily RE ion-doped multicomponent fiber, stable pulses are rather difficult to maintain in the high-power regime. Therefore, stable laser pulses from a Q-switched cavity also need to be externally amplified to higher power levels.
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