What is the method used to obtain coherent light for lens coatings?

There is a physical coating on the surface of the lens, and about 4% of the light is reflected off the contact surface between the lens and the air without coating, and the light reflectivity is about or less after the coating.

There are many ways to coat the lens, and if you want to change the coherent light to enter a light source, you need to look at the transparency.

In the case, you can take the sun to set up some sunlight at home.

There are only three ways to obtain this coherent light by lens coating, because the lens only has degrees? Only then was he able to filter out the sun's rays.

Principle: Wavefront segmentation method.

Divide a beam of light from the same point or a very small area (which can be regarded as a point light source) on the same light source into two beams, let them pass through different propagation paths, and then make them meet, at this time, the pair of lights separated by the same beam have the same frequency and vibration direction, and the phase difference at the meeting point is also constant, so it is coherent light. For example, Young's double-slit interference experiment.

2. Method: Amplitude segmentation method.

A method in which one ray of light is reflected and refracted through a dielectric film to form two rays of light to produce interference. For example, thin-film interference.

Other methods: using a laser light source, the frequency, phase, vibration direction, and propagation direction of the laser light source are all phases.

Let's take a look at the method of lens coating or linear light on the Internet, or pay attention to some of the dynamics of some users in this area.

I haven't heard of the question of how to get coherent light.

The advantage of multi-layer coated lenses and the lack of blue heads is ().

a.The aberration of the lens was corrected.

b.The resolution of the lens is higher.

c.Eliminates chromatic dispersion of lenses.

d.The reflection and refraction of various colors of light are weakened and the light transmittance is improved. (Correct answer).

a. Laser holography is the use of laser coherence is good, to obtain two frequencies of the same light, so as to interfere with the light, so a is correct;

B. 3D movies use the polarization phenomenon of light to produce a three-dimensional picture, so B is wrong;

c. The lens is coated with Xiaoxiao film to increase the reflection of light, so as to increase the transmission ability of the sunball, so it is wrong;

d. Infrared remote sensing uses the thermal effect of infrared rays to be significant and penetrating, so D is correct;

Hence the choice: AD