Study of the single-mode injection laser

Photothermal lens technique: a comparison between conventional and self-mixing schemes

“…In most cases, optical feedback is considered undesirable [3] as it significantly affects the operating parameters of the laser. Conversely, external optical feedback enhances the longitudinal mode selection, which can be used to narrow the emission spectrum width [1,4]. Additionally, another scheme has also been proposed [5] in which a semiconductor diode laser is used not only as a light source, but also as a detector.…”

Optical-feedback cavity-enhanced absorption spectroscopy in a linear cavity: model and experiments

“…It has long been known that external fields entering a single-mode semiconductor laser cavity act as injection seeding and stimulate emission, causing the laser emission to deviate from the free-running condition dictated by the current and temperature changes being applied [29,30]. In OF-CEAS, the external feedback field arises due to reflections that allow photons from the source laser to re-enter the laser cavity after traversing through an external optical system.…”

Crisis route to chaos in semiconductor lasers subjected to external optical feedback

“…Semiconductor lasers subjected to optical self feedback from a distant reflector undergo profound modification to the coupled nonlinear dynamics of its three variables: the slowly varying amplitude of the optical field E(t), the optical phase φ(t), and the carrier density in the gain medium (inversion) n(t). These systems have been studied for nearly 50 years [1][2][3], and they provide an important archetype for nonlinear time-delayed systems. Further, these systems are of intense interest for a number of high-speed applications in neuromorphic computing [4], compressive sensing [5], random number generation [6,7], secure communications [8][9][10], and optoelectronic oscillators [11].…”