The Optoelectronics Company has launched a range of direct emission 520nm green laser diode modules, which offer OEMs an alternative to DPSS green laser modules. Because green light is more visible than red laser light of the same power output, the green lasers are suitable for outdoor applications. Rangefinders and distance meters, such as those used by builders and surveyors, can be used over longer distances without losing beam quality and coherence. The modules are suitable for optical imaging and their small package size is advantageous for compact designs. The technology makes high colour rendering and contrast achievable and enables fine details to be displayed. Other applications include machine vision, biotechnology and spectroscopy. The diodes produce a high-quality elliptical beam at 520nm and offer high output stability with optical output powers of up to 35mW. They have an operating voltage of 9V DC and an ambient operating temperature range from -10°C to +50°C, and require 140mA operating current at 35mW. Reliable with externally adjustable optics and self-contained drive electronics, the modules are static, surge and reverse-polarity protected and RoHS compliant. Mechanical dimensions are 53mm x 12mm and the housing material is anodised aluminium.