A variety of potential applications such as visible light communications require laser sources with a narrow linewidth and a single wavelength emission in the blue light region. The gallium nitride (GaN)-based distributed feedback laser diode (DFB-LD) is a promising light source that meets these requirements. Here. we present GaN DFB-LDs that share growth and fabrication processes and... https://www.cosmeticssquadets.shop/product-category/acne-treatment/