从平板有机晶体中双光子激发的高度偏振和定向上转换发射。

Two-photon excited highly polarized and directional upconversion emission from slab organic crystals.

机构信息

State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University,2699 Qianjin Street, Changchun 130012, China.

出版信息

Opt Lett. 2010 Feb 1;35(3):441-3. doi: 10.1364/OL.35.000441.

DOI:10.1364/OL.35.000441

PMID:20125748

Abstract

Effective upconversion emission from an organic crystal of cyano-substituted oligo (p-phenylenevinylene) (CNDPASDB) based on two-photon absorption is presented. Frequency upconverted cavityless lasing, or amplified spontaneous emission, from the crystal pumped by a femtosecond laser of 800 nm was observed when the excitation energy exceeded the threshold of 1.3 mJpulse(-1)cm(-2). Its polarization contrast was estimated to be approximately 0.93. This large ratio is due to the unified unidirectional configuration of the molecular long axis in crystal, beneficial to the stimulated emission with a low threshold. These results indicate that the present CNDPASDB crystal has a potential for upconversion laser device application.

摘要

本文报道了基于双光子吸收的氰基取代寡聚（对苯乙炔）（CNDPASDB）有机晶体的有效上转换发射。当激发能超过 1.3 mJpulse(-1)cm(-2)的阈值时，用 800nm 的飞秒激光泵浦该晶体，观察到无腔上转换激光或受激放大自发辐射。其偏振对比度约为 0.93。这个大的比值是由于晶体中分子长轴的统一单向构型有利于低阈值的受激发射。这些结果表明，目前的 CNDPASDB 晶体具有上转换激光器件应用的潜力。