Question

2. Consider a He-Neon laser characterized by the following parameters: Operating wavelength ?? = 632.8 ????, tube

length ?? = 30 ????, cavity end-mirror reflectance values ??1 = 0.95 and ??2 = 1.00, linewidth ∆?? = 0.8 ??????, Einstein6 −1

coefficient for the lasing transition ??21 = 8 × 10 ?? and loss coefficient ???? = 0.07 ?? . Calculate (a) the threshold gain ????h and (b) the threshold population inversion ∆????h. (c) If the tube diameter is

Answer 1

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