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The minimum angular spread of a 633 nm wavelength He Ne laser beam that is originally 1.00 mm in diameter is 7.72×10⁻⁴ rad
For the case of two light sources producing individual diffraction patterns, if the center of one pattern overlaps with the first minima of the other pattern, the images are just resolvable. This is called Rayleigh's criterion for a limit of resolution in the case of diffraction.
Let λ be the wavelength of the He-Ne laser, D be the diameter of the beam, and θ be the angular spacing in radians. We can write the expression for the angular spacing using Rayleigh's formula, as follows:
θ =(1.22)λ/D
= 7.72×10⁻⁴ rad
The first gas laser was the He-Ne laser, which produced a continuous output. The very first He-Ne gas laser was able to put out an infrared beam of wavelength 1150 nm, although the laser's emitted light from the visible part of the electromagnetic spectrum was more popular. This kind of laser is based upon the principle of population inversion.
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