During summer, especially in hot and humid environments, laser condensation (dew formation) can easily occur. This is particularly dangerous for precision equipment like fiber lasers, potentially leading to optical contamination, fiber damage, or even permanent laser failure. The following measures can effectively help prevent condensation on lasers:

1. Why Does Condensation Occur?

Condensation happens when the surface temperature of the device falls below the dew point of the ambient air, causing moisture to form as water droplets on cold surfaces.

In summer, air conditioning lowers indoor temperatures while outdoor humidity remains high.

This causes laser surfaces or internal components to drop below the dew point, resulting in condensation.

Optical interfaces and light paths are the most vulnerable areas.

2. Core Measures to Prevent Laser Condensation

lControl Ambient Humidity (Most Critical)

Maintain relative humidity ≤ 60%

Use industrial dehumidifiers, especially in humid regions or during rainy seasons

Set air conditioning to “dehumidify” mode, which is more effective than standard cooling

lSet Reasonable Air Conditioning Temperature

Avoid very low indoor temperatures—keep it around 24°C to 28°C (75°F to 82°F)

Limit indoor-outdoor temperature differences to within 8°C (14°F) to reduce condensation risk

lPreheat the Device Before Operation

Do not power on the laser immediately after a rapid temperature change

Let the machine run in standby or cooling mode for 10–30 minutes to stabilize temperatures

lEnsure Optical Path Cleanliness and Sealing

Check fiber connectors, lenses, and optical modules for proper sealing

Prevent external moisture from entering the laser path

lUse Dry Air or Nitrogen Protection (if available)

High-end systems may allow dry air or nitrogen purging into the optical cavity to prevent condensation

lInstall Dew Point Monitoring Devices

Optional: Install temperature, humidity, or dew point sensors to provide early warnings of condensation risk

3.Recommended Operating Practices

Timing	Recommended Action
Before powering on	Check room temperature and humidity; ensure dew point is below laser surface temp
When using A/C	Enable dehumidification mode or run a dehumidifier simultaneously
After long shutdown	Run cooling/standby mode for 10–30 minutes before powering on the laser
When not in use	Keep the device in a well-ventilated or dry environment; use constant temp/humidity if needed

4. Conclusion

To prevent laser condensation in summer, the key is:

Humidity control > Temperature control

Maintain temperature above dew point

Good sealing + Standard operating practices

If you are using a specific fiber laser brand (e.g., IPG, Raycus, MAX, etc.), I can also provide brand-specific condensation prevention guidelines. Just let me know the model or brand.Welcome to contact us!

Learn more:

Fiber laser cutting machines;CO2 Laser