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Advanced PhysicsQ&A Library28Introduction to LasersChap. 1(e) More solid-state and somiconductor diode lasersE (eV)E (J)2 (nm)v (Hz)1/A (cm-)AIGAAS1.851Ruby2.861 10-1Alexandrite760Cr:LISAF3.568 10"Er:glass6493.51Population inversion1.6 Two energy levels E, and E, are separated by an energy gap E2-E,. Evaluate the ratio N2/N,(where N2 is the population in level Ez and N, is the population in level E) for the followingcases.T(K) Energy gapN2/N3006328 A30011 GHz3006 eV10006328 Å100011 GHz10006 eV1.7 Two energy levels E2 and E, are separated by an energy gap E- E. Evaluate the temperaturethat gives the specific population ratio N2/N, (where N2 is the population in level E, and N,is the population in level E) for the following cases.N2/NEnergy gapT(K)0.016328 A0.0111 GHz0.016 eV0.16328 A0.111 GHz0.16 eVPower and energy1.8 (a) A Nd:YAG laser has an energy of 0.4 joules/pulse, a repetition rate of 30 Hz, a pulsewidthof 20 nsec and has been focused into a spot of radius 0.5 mm. Calculste the average andpeak power of the laser. Also calculate the energy density and the peak power density atthe focus.Question

Asked Jan 24, 2020

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Energy gap is given by,

Step 2

Population inversion is governed ...

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