Nanocrystals of PbSe core, PbSe/PbS, and PbSe/PbSexS1-x core/shell as saturable absorbers in passively Q-switched near-infrared lasers

被引：37

作者：

Brumer, Maya ^{[1
]}

Sirota, Marina

Kigel, Ariel

Sashchiuk, Aldona

Galun, Ehud

Burshtein, Zeev

Lifshitz, Efrat

机构：

[1] Technion Israel Inst Technol, Dept Chem, Solid State Inst, IL-32000 Haifa, Israel

[2] Technion Israel Inst Technol, Russell Berrie Nanotechnol Inst, IL-32000 Haifa, Israel

[3] ElOp Electro Opt Ind Ltd, IL-76111 Rehovot, Israel

[4] Ben Gurion Univ Negev, Dept Mat Engn, IL-84105 Beer Sheva, Israel

来源：

APPLIED OPTICS | 2006年 / 45卷 / 28期

关键词：

D O I：

10.1364/AO.45.007488

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The saturable optical absorption properties of PbSe core nanocrystals (NCs), and their corresponding PbSe/PbS core/shell and PbSe/PbSexS1-x, core/alloyed-shell NCs, were examined at lambda = 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 similar to 10 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) congruent to 10(-16) cm(2), and an effective lifetime of tau(eff) congruent to 5 X 10(-12) s. (c) 2006 Optical Society of America.

引用

页码：7488 / 7497

页数：10

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