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首页> 外文期刊>Applied optics >Nanocrystals of PbSe core, PbSe/PbS, and PbSe/PbSe_(x)S_(1-x) core/shell as saturable absorbers in passively Q-switched near-infrared lasers
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Nanocrystals of PbSe core, PbSe/PbS, and PbSe/PbSe_(x)S_(1-x) core/shell as saturable absorbers in passively Q-switched near-infrared lasers

机译：PbSe核，PbSe / PbS和PbSe / PbSe_（x）S_（1-x）核/壳的纳米晶体作为被动调Q开关近红外激光器中的可饱和吸收体

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摘要

The saturable optical absorption properties of PbSe core nanocrystals (NCs), and their corresponding PbSe/PbS core/shell and PbSe/PbSe_(x)S_(1-x) core/alloyed-shell NCs, were examined at lambda velence 1.54 (mu)m. Saturation intensities of approximately 100 MW/cm~(2) were obtained. The NCs act as passive Q switches in near-infrared pulsed lasers. Q-switched output pulse energies up to 3 mJ, with a pulse duration of 40-55 ns were demonstrated. Analysis of the optical transmission versus pulse light intensity was carried out according to a model that includes ground-state as well as excited-state absorption. For pulses approx10 ns long, the NCs act as fast saturable absorbers. The theoretical fits yield a ground-state absorption cross section of 10~(-16)-10~(-15) cm~(2), an excited-state absorption cross section of (sigma)_(es) approx= 10~(-16) cm~(2), and an effective lifetime of (tau)_(eff) approx= 5 X 10~(-12) s.
机译：PbSe核纳米晶体（NCs）及其相应的PbSe / PbS核/壳和PbSe / PbSe_（x）S_（1-x）核/合金壳NCs的饱和光吸收特性在lambda velence 1.54（mu ）m。获得了大约100 MW / cm〜（2）的饱和强度。 NC在近红外脉冲激光器中充当无源Q开关。演示了Q开关输出脉冲能量高达3 mJ，脉冲持续时间为40-55 ns。根据包括基态和激发态吸收的模型对光传输与脉冲光强度进行了分析。对于大约10 ns长的脉冲，NC用作快速饱和吸收器。理论拟合得出基态吸收截面为10〜（-16）-10〜（-15）cm〜（2），激发态吸收截面为σ_（es）大约= 10〜 （-16）cm〜（2），有效寿命约为（tau）_（eff）= 5 X 10〜（-12）s。

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