1.During the replacement process, the placement, inspection and installation of the optical lens must be taken to protect the lens from damage and contamination. After a new lens is installed, it should be cleaned regularly.

2.When the laser cuts the material, the working surface will release a lot of gas and spatter, which will cause damage to the lens.

3.When the contaminant falls on the surface of the lens, it will absorb energy from the laser beam, resulting in a thermal lens effect. If the lens has not yet formed thermal stress, the operator can disassemble and clean it.

4.During the installation and cleaning process of the lens, any sticky matter or even nail marks printed on the oil will increase the absorption rate of the lens and reduce the service life. Therefore, the following precautions must be taken:
(1) Never use bare fingers to install the lens. Finger cots or rubber gloves should be worn.
(2) Do not use sharp instruments to avoid scratching the surface of the lens.
(3) When the lens is taken, the film layer should not be touched, but the edge of the lens is held.
(4) The lens should be placed in a dry, clean place for inspection and cleaning. A good workbench should have several layers of cleaning paper towels on the surface and several cleaning lens tissues.

Users should avoid talking above the lens and keep food, beverages and other potential contaminants away from the work environment.
In the process of cleaning the lens, a relatively low risk method should be adopted. The following steps are set up for this purpose and should be used by the user.

This step is necessary to blow off the float on the surface of the original with a blower, especially a lens with tiny particles and flocs on the surface. But don’t use compressed air on the production line, because it will contain oil mist and water droplets, which will deepen the pollution of the lens.

In the second step, the lens was slightly cleaned by analyzing pure acetone. This grade of acetone is almost anhydrous, which reduces the likelihood of lens contamination.

The acetone on the cotton ball must be cleaned under illumination and circularly moved. Once the cotton swab is dirty, it must be replaced. Cleaning should be done at one time to avoid creating ribs. If the lens has two coated surfaces, such as lenses, each side needs to be cleaned in this way. The first side needs to be placed on a clean lens paper for protection.

If acetone does not remove all the dirt, then use acid vinegar to clean. When the vinegar is cleaned, it is used to dissolve the dirt to remove the dirt, but it will not cause damage to the optical lens. This acid vinegar can be experimental grade (diluted to 50% strength), or white vinegar containing 6% acetic acid for household use. The cleaning procedure is the same as for acetone cleaning, then the acid vinegar and the dry lens are removed with acetone. At this time, the cotton balls are frequently changed to completely absorb the acid and hydrate. Until it is clean.

When contaminants and lens damage cannot be removed by cleaning, especially due to metal splashes and dirt, the only way to restore good performance is to replace the lens.