During project development, engineers facing a wide array of laser modules may find that an incorrect selection leads to insufficient system performance or project delays. To address this, we have compiled an efficient five-step selection process to assist in accurately choosing the suitable product.
• Core Five-Step Selection Process:
Determine Wavelength → Determine Power → Determine Package & Size → Determine Power Supply & Control → Verify Special Requirements & Certifications
• Step 1: Determine Laser Wavelength
Wavelength is a fundamental property of lasers, determining their interaction with materials and application scope.
Ultraviolet lasers (e.g., 355nm) are suitable for cold processing scenarios like fine machining and semiconductor inspection.
Blue lasers (e.g., 405nm, 450nm) are commonly used for fluorescence excitation, 3D printing, indication, and projection light sources.
Green lasers (e.g., 520nm, 532nm), due to high eye sensitivity, are widely used for aiming and medical applications.
Red lasers (e.g., 632nm, 650nm) are often used for barcode scanning and alignment.Infrared lasers like 808nm and 980nm are commonly used as pump sources; 1064nm is widely used for metal processing and ranging; 1550nm is an eye-safe wavelength, primarily used in LiDAR and military fields.
Wavelength selection should be based on specific application requirements and budget.
• Step 2: Determine Output Power
Power level affects processing results, effective range, and brightness.Below 500mW is suitable for non-processing applications like indication, aiming, and sensing; 500mW to 50W applies to plastic marking and scientific research; over 50W is used for heavy industrial applications like metal cutting.
Selection requires a 10%-20% power margin to handle aging and fluctuations; pulsed laser performance should be evaluated based on average power; high-power lasers must comply with safety standards and include protective measures.
• Step 3: Determine Package Form and Size
The physical form of the laser module must match the device structure.C-Mount packages offer threaded fixation and good heat dissipation, suitable for medium to high-power scenarios.
TO-Can structures are compact and economical but require additional heat sinks and optical components.
Fiber-coupled output facilitates integration and provides high beam quality.Modular modules integrate driver and optical systems for simplified use.Open structures support custom optical design but involve complex integration.Selection requires confirming installation space and matching a cooling solution. Particularly for high-power laser modules, active cooling methods like forced air or water cooling are necessary to prevent damage from overheating.
• Step 4: Determine Power Supply and Control Method
The power supply method impacts system electrical integration.Low-voltage DC (e.g., 3V, 5V, 12V, 24V DC) is common in modular designs.High-voltage AC (e.g., 110V, 220V AC) is mostly used in industrial laser equipment.Control methods include:CW (Continuous Wave): 2-wire control, module operation via power on/off.Digital Level TTL: Laser switching via high/low level signals; duty cycle adjustment controls the average output power.
Analog Modulation: Linear adjustment of laser power via continuously varying voltage or current signals.
• Step 5: Verify Special Requirements and Certifications
Confirm optical parameters such as working distance, spot size and shape, divergence angle, Gaussian characteristics, and straightness.
Ensure the operating temperature range meets environmental requirements.Compliance with target market regulations, including laser safety classes and RoHS certifications, is mandatory. Discuss application fields and regulatory requirements with suppliers early in the selection process.
• Summary
By sequentially determining wavelength, power, package, power supply, and special requirements, user needs can be translated into precise technical specifications. This method enhances selection efficiency and project success rate.
Wishing you a successful selection process!