Coherent control of two-photon absorption of Pr3+ ion by shaped ultrashort laser pulses
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摘要:
Enhancing the photoluminescence and depressing the background emission are important problems in rare earth ion-doped materials.In this letter,the two-photon absorption (TPA) probability in a Pr3+ ion system is enhanced by a factor of 12.3 by a π-phase step scanning of ultrashort laser pulses.This level is significantly higher than that achieved by a transform-limit pulse.However,the laser intensity of shaped pulse is reduced to 37% of the initial transform-limited pulse.In this method,the TPA probability can also be reduced to 58%.Furthermore,the effect of the shift of the intermediate energy level and the bandwidth of final states on TPA probability is discussed.