Abstract
Wide tunable range, narrow linewidth, and high resolution are the most demanded for industry, medical science, communication systems, optical coherence tomography, and spectroscopy analysis. External cavity diode laser (ECDL) has been the preferred scheme to realize for wide-tuning and narrow-linewidth characteristics. ECDL is advantageous in terms of low noise, high side-mode suppression ratio, high-temperature stability, simple structure, and low cost. Primarily, we will discuss different types of semiconductor lasers and different technique schemes for tuning. Then we will focus on the tunability of laser beams of semiconductor materials by using diffractive grating. Finally, the potential development prospects of wide tuning and high-output power diode lasers are presented and discussed. Keywords: Semiconductor laser, Tunable, Narrow linewidth, diffractive grating.
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