Fabrication Of Dye Random Media And Detection Of Lasing Spectra

Random lasers, which correspond with lasing phenomenon due to interaction between the optical wave and the amplifying random media, have become a hotspot in laser physics. The investigations on random lasers present an important value both in theory and application. Depending on different feedback mechanism, random lasers are classified into two categories: incoherent feedback random lasers and coherent feedback random lasers. In the past decade, several experiments on these two types of random lasers have been reported, thus many theoretical models have been developed to explain the experimental results. In this paper, we summarize and analyze the experimental phenomenon and methods of these two types of random lasers, and then introduce the fabrication and testing of the dye random laser. Based on this, a new type of random laser is brought forward. The paper is organized as follows. First we summarize the basic experimental results and the theoretical explanation of random lasers. The difference between these two types of random lasers and the bases of the classification are intensively discussed. In the second part we summarize and analyze the experimental methods on incoherent feedback random lasers. The progress we made in this field, especially the fabrication technique and the spectral testing method on solid-state dye random laser media, are introduced in details. We then take deep research on the external-feedback effects in high-gain scattering media. Thirdly the nanoporous random laser is brought forward. After summarizing the fabrication technique of the nanoporous polymer film, we demonstrate the feasibility of the nanoporous random laser combining the knowledge we mastered in dye random lasers. In the last section based the theory in morphological dependence of random lasers, we present an experimental project on it, and discuss the feasibility in details.