How to identify the model number of a laser diode

You can obtain a laser diode model number by checking the laser marking on the diode, consulting the datasheet, or using manufacturer search tools.1. Check the Laser MarkingMost laser diodes have a laser-etched code on the diode cap that represents the part number. For example, Ushio laser diodes use a combination of letters and numbers (typically 6–8 characters) to indicate the model, production year, and month . The first few characters often identify the diode type, while the last character may indicate the production year, and a letter may represent the month.2. Consult the DatasheetIf you have access to the diode's datasheet, it will clearly list the model number, wavelength, power, and package type. Manufacturers like ProPhotonix and Thorlabs provide online selectors and datasheets where you can match your diode's specifications to find the exact model . Key parameters to note include wavelength, output power, and package style.3. Use Online Search ToolsWebsites such as Laser Components and ProPhotonix offer laser diode search engines. By entering your diode's specifications (wavelength, power, package), you can quickly locate the corresponding model number . If no exact match is found, contacting technical support can help identify custom or discontinued models.4. Visual and Module InspectionFor diode modules, sometimes the enclosure or PCB has a label with the model number. You can also refer to YouTube tutorials or manufacturer guides that demonstrate how to identify the diode inside a module safely without damaging it . This is especially useful for older or unmarked diodes.5. Contact Manufacturer SupportIf markings are unclear or the diode is custom, contacting the manufacturer with the diode's physical characteristics and measured parameters (wavelength, power, package) is often the most reliable way to obtain the model number . By combining these methods—checking markings, consulting datasheets, using search tools, and contacting support—you can accurately determine the laser diode model number for replacement, troubleshooting, or documentation purposes.