4in1 Photonics offers both standard and custom-designed photonics products. We specialize in single mode/multimode UV/Visible/NIR laser modules in fiber or free space.  We also offer Si / InGaAs Avalanche photodetectors, composite laser crystals waveguides, coated fiber focusers, fiber couplers and fiber collimators. Our team has decades of experience in Photonics with custom-product engineering, design and manufacturing. Visit our company web site for more details. www.4in1photonics.com