Smallest Laser Diode

The smallest commercially available laser diode modules have housing diameters as small as 3.3 mm, offering compact, low-power solutions for a variety of applications.Overview of Small Laser DiodesSeveral manufacturers offer ultra-compact laser diode modules designed for space-constrained applications:FLC - Frankfurt Laser Company offers the ML-ARX-YYY-ZZ series, which are among their smallest modules. These are available in wavelengths of 635 nm, 650 nm, 780 nm, and 850 nm, with output powers ranging from 1 mW to 5 mW, suitable for low-cost and volume applications .Laser Components provides the LC-LMD series, with the smallest dot laser module featuring a 3.3 mm housing diameter. These modules include the laser diode, drive electronics, and optics in a compact metal housing, available at 635/650 nm and 780/850 nm .ProPhotonix offers compact laser modules starting at 8 mm in diameter for elliptical beams and 9 mm for line or cross-generating lasers. These modules are highly efficient, battery-operable, and configurable for CW or TTL modulation .EIT Lasertechnik produces 635 nm and 650 nm mini lasers that are lightweight, low-power, and compact, designed for industrial alignment, machine vision, laser sighting, and portable devices .Key FeaturesCompact Size: Housing diameters range from 3.3 mm to 9 mm, making them ideal for handheld or integrated systems.Low Power Consumption: Typically 0.9 mW to 5 mW, suitable for battery-powered devices.Wavelength Options: Commonly 635 nm and 650 nm (red), 780 nm and 850 nm (infrared), with some green options at 515–520 nm.Applications: Industrial alignment, machine vision, medical devices, laser sights, bar scanning, and portable optical systems.Integrated Design: Many modules include built-in optics, drive electronics, and adjustable focus, reducing the need for external components.ConclusionFor the smallest laser diode modules, the 3.3 mm housing diameter dot lasers from Laser Components represent the most compact commercially available option, while other manufacturers offer slightly larger but still highly compact modules suitable for OEM, industrial, and portable applications . These miniaturized modules balance size, efficiency, and cost, making them ideal for applications where space is at a premium.