A Research On Excitation Characteristics Of Random Laser Based On The Biological Membrane

A traditional laser is usually consisted of two basic elements: a material that provides optical gain and amplified to the photons through stimulated emission and an optical Fabry-Perot cavity which trapping the light partially. At the same time, the characteristics of a laser such as the wavelength, the modes, the direction of the output and polarization state are all determined by the cavity. Unlike tradictional laser, the normal optical cavity is not necessary for the random laser. It is the multiple scatterring of the photons in the random active medium that provides the optical gain. Moreover, the modes and the directionality depend on the multiple scattering but not by a laser cavity.Due to the special luminescence mechanism, random laser has some unique luminescent properties different from the traditional laser, making it greatly a potential application for exploration and development. In recent years, random laser has attracted widely attention and become the focus in the field of laser display, detection of biological tissue, and the materials science.In this investigation, we study the excitation properties of random lasers based on eggshell biomembrane for the first time by coupling the theoretical, experimental and numerical respectively. The research of paper is becoming a hot spot field of random laser with great significance and valuale application. It will enrich the basic theory and analysis tools of random laser.Fisrt of all, the paper narrates the recent development situation of random laser and then describes three different scattering modes including Rayleigh scattering, Raman scattering and Mie scattering that can occur in random laser respectively; Moreover, the excitation characteristic and basic principles of incoherent random laser, coherent random laser, Raman laser and SPASER random laser are also briefly discussed; Finally we summarize the features of random lengths and laser physics concepts that are widely used in the random laser.The second part of the paper introduces the generation of random lasers based on biomembrane. From the experimental results, we find that eggshell biomembrane is mainly constructed from highly complex interlaced fiber network structure which is made of protein and collagen. In addition, we also designed and adjust two sets of optical test platform to test and compare the excitation characteristics and time response process of biomembrane random laser systematically. Eventually, the formation mechanism of the bio-based random laser is in discussion too.The final part of our work establishes a two-dimensional random laser model based on biomembrane prototype. We simulate radiation intensity distribution of random laser under different pump conditions. The experimental results show that if the pump light incidents to random medium from multiple angles simultaneously, the electric field will be superimposed on each other and induce electric field distribution with greater intensities On the other hand, we also use Mie scattering theory to simulate the scattering mean free path of photons in the biomembrane-based random laser, which infers that biomembrane / Rh6 G random laser system achieved in this experiment is a very weakly scattering structure.