Laser interferometers have many types of interferometer products based on different optical bases, but interferometers have the following advantages and disadvantages because of their principle.

The first high precision.

In the case of optical components, since small changes in components can seriously change the original optical quality, it is necessary to have very accurate measuring instruments. The interferometer has the advantage of very high precision, up to 1/100 wavelength or even 1/1000 wavelength, wavelength refers to the wavelength value of the light source used in the interferometer. For example: the wavelength of a general interferometer is 632.8 (nm), and the one percent of 632.8 is about 6 (nm), the current Nanotechnology is at this scale, and even some better interferometers can go to 0.6 (nm).

Second, the measurement method is non-contact measurement.

Another type of profiler used for measurement is a contact type measurement method. Even if it is possible to fine-tune the contact force at present, it is still impossible to determine whether the object with weak surface is really not damaged at all. When the interferometer measures, it illuminates the object to be measured, so the probe on the interferometer is just light, and it does not cause any damage to the surface of the object.

The third ,speed is fast.

When using the probe to measure, it is impossible to measure all the areas at once, and it may be necessary to divide the scanning line to measure. Relatively speaking, the measuring speed of the interferometer is very fast, and it may be measured in a few seconds without waiting. A few hours.

The disadvantage of the fourth interferometer is that the threshold is high.

When an operator uses an interferometer but is not sure about the interference limits, conditions, and principles of the interferometer, it may not measure what he wants, and because the interferometer is measured by light, it will also cost adjustments. More time, it may take a few seconds for the measurement to take place, but the adjustment beforehand takes dozens of minutes or even hours.