What is M2 factor in laser?

What is M2 factor in laser?

In laser science, the parameter M2, also known as the beam propagation ratio or beam quality factor is a measure of laser beam quality. It represents the degree of variation of a beam from an ideal Gaussian beam.

How is laser beam quality measured?

For laser beams for which the second-order moments of intensity (beam width) and divergence can be determined, the beam-propagation ratio M2 is often used to characterize beam quality. The M2 factor compares the actual shape of the beam to that of an ideal Gaussian beam.

How are M Squared Lasers measured?

How is M2 calculated?

1. Start with a collimated beam.
2. Focus it with an aberration-free lens.
3. Measure the diameter of the beam at various positions around the focal point: take at least 10 data points, approximately half within the first Rayleigh distance of the focal point, and the other half beyond 2 Rayleigh lengths.

What is beam quality of fiber laser?

Together with the optical power, the beam quality factor determines the brightness (more precisely, the radiance) of a laser beam. For example, if a beam has M2 =1.6 (or greater), it cannot be focused down to a spot less than 1.6 times the focal spot diameter of a diffraction limited beam with the M2 =1.

What is a Class 3B laser?

WHAT IS A CLASS 3B LASER? Class 3B lasers are hazardous for eye exposure. They can heat skin and materials but are not considered a burn hazard. For visible-light lasers, Class 3B lasers’ output power is between 5 and 499 milliwatts.

What is M2 value?

M2 or Beam Propagation Ratio, is a value that indicates how close a laser is to being a single mode TEM00 beam, which in turn determines how small a beam waist can be focused. For real beams, M2 will be greater than 1, and thus the minimum beam waist will be larger by the M2 factor.

What is power in the bucket?

Power in the Bucket (PIB) is a key index to describe the quality of Laser. It is defined as all the power within a circular region in the cross section of the laser beam, and the radius of the circular region is defined as the bucket radius[1].

What is the M Squared?

The square meter is the SI-derived unit of area. It has a symbol m² (33A1 in Unicode). It is defined as the area of a square whose sides measure exactly one metre.

What type of laser is first created?

For example, the first working laser was a ruby laser, made from ruby (chromium-

What are Class 4 lasers used for?

Class 4 lasers are high power (CW. > 500mW or pulsed >10J/cm²) devices. Some examples of Class 4 laser use are surgery, research, drilling, cutting, welding, and micromachining. The direct beam, specular and diffuse reflections from Class 4 lasers are hazardous to the eyes and skin.

What is m Squared m?

The square meter is the SI-derived unit of area. It has a symbol m² (33A1 in Unicode). It is defined as the area of a square whose sides measure exactly one metre. But a square that is 4 metres squared would have 4 metres on each side. This means it would have 16 square metres of area.