Characteristics Of A Flexible Multi-wavelength Distributed Feedback Laser Emission

The Traditional lasers are composed of three parts, such as the pump source, gain medium and resonator. However, the original resonator is replaced by Bragg diffraction grating in distributed feedback laser(DFB), and the Bragg diffraction grating effect makes the incident and diffracted light forming a closed loop in one direction,corresponding to the traditional laser cavity. The distributed feedback laser has many advantages such as with a wide wavelength range, miniature in volume, less weight, low cost, simple and easy to be fabricated in production. Thus, DFB lasers have great potential applications in the fields of forensic science, optical communications.In this paper, a further research was carried on based on plasmons, flexible substrate and the thin film. The results are as following aspects.1. A multi-wavelength distributed feedback laser based on flexible substrate was fabricated successfully, changing the output wavelength by mechanical bending methods.The one-dimensional linear gratings, two-dimensional square lattice gratings and triangular lattice structure gratings were made by adjusting the thickness of the resist,using different gain media concentration and thickness. Pumped by the 400 nm laser, the two-dimensional square lattice structure and the triangular lattice structure distributed feedback laser can simultaneously emit dual and triple wavelength lasers, respectively. In this paper, the wavelengths of output laser emissions will vary with the substrates bending directions and angles, showing red shift or blue shift.2. A film distributed feedback laser with 290 nm thickness without substrate were fabricated, exhibiting a lower threshold energy than that of film DFB on the substrate distributed feedback lasers.3. The multi-wavelength distributed feedback lasers without substrate were masked on optical fiber end faces, realizing the transfer of thin film distributed feedback laser, and showing potential applications of non-substrate-film-type distributed feedback laser in terms of miniaturization.