Laser Device Winter Anti-Freezing Guide

As temperatures drop in certain regions, protecting laser devices from freezing becomes increasingly important. To ensure stable operation during use, pay attention to the following points:

Extend the warm-up time appropriately

• Do not power on the laser immediately after it has been transported via express delivery. The laser temperature will be as low as the outdoor temperature. Allow the laser to sit indoors for 12 hours to avoid problems caused by rapid temperature changes. For water-cooled lasers, you can run the water cooling cycle without turning on the laser, using the built-in heating function of the chiller to gradually warm up the laser.

• During daily startup, check the temperature of the water chiller and the indoor temperature. Only power on the laser when the water chiller reaches its set temperature. For air-cooled lasers, the indoor environment temperature must be above 15°C for normal operation. If a low-temperature alarm is triggered, it means the laser has detected an unsuitable temperature. Turn off the machine and wait until the temperature rises before restarting.

Choosing the Right Antifreeze

In Winter, Choosing Antifreeze Requires Proper Temperature Consideration.When selecting antifreeze in winter, it is important to note that a lower freezing point does not necessarily mean better performance. The antifreeze should be chosen according to the lowest expected temperature in the local area. Common antifreeze specifications include -15°C, -25°C, -35°C, and -45°C. If a customer already has antifreeze rated for -35°C but does not require such a low freezing point, it can be diluted with water to adjust the freezing point. For example, with -35°C antifreeze:

Antifreeze Mixing Ratios

Drain the Cooling Liquid

When placing the laser in long-term storage or during transportation, please drain the internal water cooling liquid from the laser.

When the temperature drops below the freezing point of the cooling liquid, the liquid will freeze. Upon freezing, the expansion of the liquid volume can cause damage to the water cooling connectors, and in severe cases, it may result in deformation of the resonator cavity, leading to laser damage. Therefore, when placing the laser in long-term storage or transporting it, it is important to drain the internal liquid from the laser. As shown in the illustration below, you can cut two sections of water pipes and insert them into the laser's water inlet and outlet, allowing the internal liquid to drain out. To ensure thorough drainage, you can use an air gun to blow air into one of the pipes. Additionally, if the equipment will be shut down for an extended period, such as during a holiday break, it is recommended to drain the liquid from the cooling system.