Discussion

Match the following :

Answer: D

The keyed matching is a-ii, b-iv, c-i, d-iii.

(a) A narrow spectral line width means a long coherence time, so line width is tied to coherence (ii).
(b) Directionality, the spread of the beam, is degraded by scattering in the medium (iv).
(c) Photon energy is fixed by the wavelength, \(E = hc/\lambda\) (i).
(d) The quality factor of a laser cavity is the ratio of the energy stored to the energy lost per cycle (iii).

The other codes pair energy with coherence or stored energy, or line width with wavelength, which breaks these relationships.

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