A dual-wavelength random laser of polymer film is fabricated by a spincoating method, and the dual cavities of step type are prepared on a silica substrate. The random microstructure forms due to the phase separation in the fabrication process, and provides a multiscattering mechanism for random lasing. The wavelength of output emission alters from 450 nm to 467 nm, when the pump spot totally shifts from cavity A to Cavity B. The output intensities can be adjusted by the ratio of illuminate areas on the dual cavities. The design of step cavities provides simple approach of a dual-wavelength random lasing emission, demonstrating potentials for compact laser devices.

通过旋涂法制造聚合物膜的双波长随机激光器，并在二氧化硅基板上制备阶梯型的双腔。由于制造过程中的相分离，形成了随机的微观结构，并为随机激射提供了多散射机制。当泵浦光斑完全从腔A移到腔B时，输出发射的波长从450 nm更改为467 nm。可以通过双腔上照明面积的比例来调整输出强度。阶梯腔的设计提供了双波长随机激光发射的简单方法，展示了紧凑型激光设备的潜力。