Influence of spatial localization on the threshold of quasi-state cavities in random lasers
随机激光器中准态腔的阈值与其局域化程度的关系

Laser phenomena in random media have been studied based on the localized theory for optical waves in finite random media. The relationship between spatial localization and amplification for quasi-state modes has been investigated by use of the finite difference time domain method. The spatial profile and the spectra characteristics of quasi-state modes are determined by analyzing the localized processes of optical light beams in random media without gain. The amplification and threshold of quasi-state modes are analyzed in random media with gain. Results show that the quasi-state mode with a stronger spatial localization has lower threshold and can be amplified preferentially.