What's The Difference Between Laser And Light?

Both Laser and light are electromagnetic waves, and they have many similarities, such as both can be used for lighting, have a wide range of wavelengths, and both can reflect and refract, etc. But at the same time, lasers and lights are also very different in other ways, you know?

1. Differences in the principle of light emission
A laser is a monochromatic, coherent, and directional beam produced by a laser. The generation of laser is based on the stimulated radiation in the laser cavity. The laser makes the particles in the device transition from a low energy level to a high energy level by inputting energy. When a large number of particles are in a high energy level state, only a weak excitation can stimulate a large-scale, almost all photon emission of the same energy. out, forming a laser. Lasers are monochromatic, coherent, and linear.

Light, on the other hand, is a broad-spectrum, incoherent source of light, usually produced by methods such as resistive wire, gas discharge, and semiconductors. In these light-emitting modes, after the particles generate energy and release it, they will be scattered randomly in all directions. Therefore, the photons generated by the light have different frequencies and phases, and the scattering angles are not uniform, so it is difficult to guarantee coherence and linear directionality.

2. Hazard difference
Because the laser is generated in the resonant cavity, the optical path difference is very small, and the attenuation loss in the resonant cavity is also very small, so the laser has high monochromaticity and directivity. The laser can be further modulated to have a fairly high laser intensity, which can concentrate the energy and spread it through the air. Under short-distance conditions, the laser can show a high degree of focus, which is very harmful. The light beam is different, because it cannot overcome the polarization effect and scattering effect, the beam is not clear enough, the visible distance will be shorter, and the spot is not as single as the laser spot. The hazard is very low.

3. Optical power difference
Lasers have greater light output power than lamps. Stimulated emission of radiation causes a large increase in the energy of photons at the same time, traveling in a single direction, thereby increasing the intensity of the laser beam produced by the laser. The photons of the light are generated by spontaneous radiation, the direction is random, and they are transmitted in a divergent state. We look like soft light.

4. Use difference
Laser can be used for myopia surgery, which is an effective and quick way to treat high myopia. At the same time, laser can completely remove scars, moles, and freckles, restore skin surface elasticity, and make skin smoother. It can be used in cutting, welding and other industries. Uses, optical communication, security, lighting and other uses are much wider than lighting.

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