Fixed-focus CW diode-pumped laser diode modules 2501 and 2503 have respective beam divergence values of less than 1.2 and 0.8 mrad. Both require 3 Vdc with operating current around 300 mA. Model 2501 offers 11 mm dia x 37.39 mm long laser housing designed with threads to enable add-on of additional optics. Laser housing for Model 2503 is 12 mm dia x 47.4 mm. Applications include spectroscopy, positioning, flow visualization, and holography.