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A novel method for the generation of a tunable dual-frequency laser source is presented. The proposed system uses a laser diode with optical feedback and operating at period-one (P1) oscillation state. Through investigation on the optical spectra of the laser at this state, dual-frequency components can be obtained and the separation (i.e., the difference) of the two frequencies can be flexibly adjusted from 2.72GHz to 3.12GHz by varying the external cavity length. Such dual-frequency feature and its tunable range have many potential applications for both optical and microwave measurement. The...

As one of the most widely used light sources today, semiconductor lasers (SLs) are an important part of many optical systems, especially for sensing, communications, metrology, and storage applications. SLs have the advantages of small size, easy integration, and miniaturization. The massification of electronic devices has furthered this agenda, allowing the creation of portable systems capable of supporting optical sensing systems. Essentially, SLs are inherently nonlinear devices, in nonlinear systems, the folding and stretching behaviors of variables result in di↵erent dynamical routes. I...

CO2 isotope measurements are a critical tool for studying climate change and for modelling future climate scenarios.

/PRNewswire/ -- CO2 isotope measurements are a critical tool for studying climate change and for modelling future climate scenarios. By measuring CO2 isotopes...

Microwave photonic (MWP) sensing and measurement are envisioned to be a promising alternate to the conventional pure electronic or optical solutions. By using a semiconductor laser (SL) subjected to external optical feedback (EOF) operating at period-one (P1) dynamic state to generate MWP signals, a high performance sensing system is proposed for displacement with wide measurement range and super-high resolution. Through analysis on the state diagram of the system and its dynamics in P1, the relationship between the relaxation oscillation frequency of the system and external cavity length is d...