Quantum coherent control of blue, green and red emissions from codoped lanthanide ions of Er³⁺/ Tm³⁺/Yb³⁺ by two shaped infrared ultrashort laser beams

The enhancement and tunable color emissions from codoped lanthanide ions of Er³⁺/Tm³⁺/ Yb³⁺ have been studied extensively in recent decades In this paper we present a new scheme for quantum coherent control of two-photon absorption (TPA) and color emission in codoped lanthanide ions of Er³⁺/Tm³⁺/ Yb³⁺ by properly phase shaping two infrared ultrashort laser beams at central frequencies of 10 650 cm ^-1 and 7650 cm ^-1 respectively Compared with the results irradiated by transform-limited pulses the TPA probabilities of the blue green and red emissions are independently controlled in the ranges 0-133 0-145 and 0-10 respectively The effects of the energy states of lanthanide ions and the laser spectral bandwidths on the coherent features are also discussed The TPA probabilities for the blue and green emissions increase with the laser spectral bandwidths and decrease with the energy bandwidths of the final level states As the intermediate energy level shifts in the range 10 100-10 500 cm^-1 the TPA probabilities for the blue and green emissions change in the ranges 7-15 and 8-17 respectively