Laser technology has become deeply integrated into industrial manufacturing, medical aesthetics, optical communications, autonomous driving, and many other fields. As core components, the output power and wavelength accuracy of lasers directly determine application effectiveness and product safety. For laser R&D and manufacturing companies, establishing a standardised power and wavelength testing process is not only a core part of quality control but also an essential prerequisite for compliant market launch and successful export.
I. Power and Wavelength: The “Backbone” and “Soul” of Lasers
Laser power refers to the laser energy output per unit time, usually expressed in watts (W) or milliwatts (mW). It directly determines the laser’s processing capability and application performance – industrial cutting requires high power, while optical communications and medical aesthetics demand strict power stability. Too high a power may introduce safety hazards, while insufficient power fails to meet application requirements.
Laser wavelength determines the way the laser interacts with matter. Different wavelengths have varying absorption rates and penetration depths for materials, and also directly affect the eye safety class. For example, ultraviolet lasers can damage the cornea, while infrared lasers can penetrate deep into the retina. Wavelength deviation may lead to product failure or safety risks.
II. Core Process for Power and Wavelength Testing
Standardised laser performance testing is like a comprehensive “health check” for the product. Power and wavelength testing typically includes the following key steps:
1. P‑I‑V (Power‑Current‑Voltage) characteristic testing
Plot the output power versus drive current curve, as well as the voltage‑current (V‑I) curve. This is the most basic performance characterisation of a laser, directly reflecting key parameters such as threshold current and slope efficiency.
2. Output power testing
Using a calibrated laser power meter, project the beam spot onto the active area of the receiving surface, and read the power value after the laser reaches stable operation. Power stability (RMS power stability and peak‑to‑peak power stability) is an important indicator of laser quality.
3. Peak wavelength and spectral testing
Couple the laser into a spectrum analyser, set an appropriate scanning range and resolution, and record the distribution curve of relative spectral intensity versus wavelength. The wavelength corresponding to the maximum relative spectral intensity is the peak wavelength. Wavelength stability testing focuses on the wavelength drift of the laser under operating conditions.
4. Wavelength tuning characteristic testing
For tunable lasers, test the wavelength variation under different temperature and current conditions, and plot the temperature‑current‑wavelength tuning curve.
III. Testing Timeline and Third‑Party Bodies
The timeline for laser power and wavelength testing varies depending on the product type and the complexity of test items. Generally, standard performance testing takes about 7 to 15 working days, with some organisations offering expedited services (approximately 5 working days). For products requiring full certification (e.g., laser safety classification, FDA, CE, etc.), the overall timeline should be assessed in combination with the specific certification requirements.
When looking for a professional laser testing body, key factors to consider include accreditations, testing capabilities, and industry experience. Test reports issued by third‑party laboratories with CMA/CNAS accreditation carry legal weight and international mutual recognition. Shenzhen Zhongwei Inspection Technology (CTNT) is a professional laser equipment testing and certification organisation, holding dual CNAS/CMA accreditations, with more than 70 laser‑related authorised standards and over 120 testing capability parameters. Its power measurement range covers pW to 5 kW, and pulse measurement is capable down to the picosecond level, having served more than 5,000 laser companies.
IV. From Testing to Market Launch: The Essential Path to Compliant Export
Compliance for laser products involves not only meeting performance parameters but also optical radiation safety certification. The national mandatory standard GB 44703‑2024 (General requirements for optical radiation safety) was published in 2024 and will come into effect in October 2026, specifying clear requirements for optical radiation safety classification, labelling, and control of laser products. In international markets, IEC 60825‑1 is the passport for laser products entering the EU, North America, and other markets, classifying them into safety classes from Class 1 to Class 4 based on wavelength, output power, and other parameters.
Shenzhen Zhongwei Inspection not only provides testing of power, wavelength, and other performance parameters but also offers one‑stop services including laser eye safety certification, laser safety classification testing, and FDA/CE/IEC certification – supporting laser products throughout the entire process from R&D validation and production quality control to market access, ensuring compliant market launch and smooth export.
