Pigtail style collimator for 633nm with an f=4.7mm Grin-lens in a 4mm OD housing, with -40dB return loss, with a 1 meter long, 900µm OD cabled, 4/125µm singlemode fiber, terminated with an angled FC/APC connector. The predicted collimated beam diameter will be around 0.9mm at the 1/e^2 level.
