Air-cooled Laser VS Water-cooled Laser
Air-cooled laser: laser is cooled by the environment air (fan, fin, TEC etc.)
    
    
Water-cooled laser: laser is cooled by chiller, two tubes connect laser and chiller
(there are two types of chiller: air-cooled chiller and water cooled chiller, click here for the difference)
Comparison:
| Air-cooled laser | Water-cooled laser | 
| Compact | Bulky, external chiller needed | 
| Temperature cannot be lower than environment air temperature | Temperature can be lower than environment air temperature | 
| Cooling performance is affected by air temperature | Cooling performance is slightly or not affected by air temperature | 
| Cooling capacity is low | Cooling capacity is high | 
| Dust problem | No dust problem | 
| Noise | Can be quiet | 
| Cost low | Cost high | 
| For small power lasers | For high power lasers | 
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