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About: Complex beam parameter     Goto   Sponge   NotDistinct   Permalink

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Type: yago:WikicatOpticsyago:BodyPart105220461yago:Eye105311054yago:Organ105297523yago:Part109385911yago:PhysicalEntity100001930yago:SenseOrgan105299178yago:Thing100002452 New Facet based on Instances of this Class

In optics, the complex beam parameter is a complex number that specifies the properties of a Gaussian beam at a particular point z along the axis of the beam. It is usually denoted by q. It can be calculated from the beam's vacuum wavelength λ0, the radius of curvature R of the , the index of refraction n (n=1 for air), and the beam radius w (defined at 1/e2 intensity), according to: . Alternatively, q can be calculated according to where z is the location at which q is calculated, relative to the location of the beam waist, zR is the Rayleigh range, and i is the imaginary unit.