Pigtail style collimator for 633nm with a 0.25 meter long, 3mm OD PVC cabled, 4/125 PM fiber, a 4mm OD housing with a f=1.81mm GRIN lens with -40dB return loss with the other end terminated with an angle polished 1.8mm OD ferrule. The output beam diameter will be 0.4mm. SP: 6 Angle Polish, 2mm ferrule. Many cladding modes
