State Modeling to Investigate the CW Pumping Behaviour of Organic Solid-State Lasers

Abstract

Organic solid-state lasers (OSSLs) have emerged great potential for communication, lab-on-chip applications, bio integration and low-cost sensing for the unique features of organic gain materials. Continuous wave (CW) operation of OSSLs, that is extremely required for spectroscopy and sensing, is limited by the existence of triplet states of organic molecules. This work focuses on advanced state modeling that considers different important properties of organic gain medium required for the realization of CW-OSSLs. Two approaches are considered to investigate the population inversion (i.e. lasing) of OSSLs upon CW pumping: (i) considering three lowest singlets and two triplet states without the loss of the cavity, and (ii) considering triplet managers into a guest/host gain medium with the loss of the cavity. In the first approach, it is observed that intersystem crossing (ISC)–an inherent property of organic dyes–is the key mechanism that kills CW operation of OSSLs. To overcome this problem, the second approach considers a guest/host system incorporating triplet manager that reduces the effect of ISC on CW lasing. This study indicates important properties of organic gain materials required for CW lasing in OSSLs.