Question

1.7

28
Introduction to Lasers
Chap. 1
(e) More solid-state and somiconductor diode lasers
E (eV)
E (J)
2 (nm)
v (Hz)
1/A (cm-)
AIGAAS
1.851
Ruby
2.861 10-1
Alexandrite
760
Cr:LISAF
3.568 10"
Er:glass
6493.51
Population inversion
1.6 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 following
cases.
T(K) Energy gap
N2/N
300
6328 A
300
11 GHz
300
6 eV
1000
6328 Å
1000
11 GHz
1000
6 eV
1.7 Two energy levels E2 and E, are separated by an energy gap E- E. Evaluate the temperature
that 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/N
Energy gap
T(K)
0.01
6328 A
0.01
11 GHz
0.01
6 eV
0.1
6328 A
0.1
11 GHz
0.1
6 eV
Power and energy
1.8 (a) A Nd:YAG laser has an energy of 0.4 joules/pulse, a repetition rate of 30 Hz, a pulsewidth
of 20 nsec and has been focused into a spot of radius 0.5 mm. Calculste the average and
peak power of the laser. Also calculate the energy density and the peak power density at
the focus.
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Transcribed Image Text:28 Introduction to Lasers Chap. 1 (e) More solid-state and somiconductor diode lasers E (eV) E (J) 2 (nm) v (Hz) 1/A (cm-) AIGAAS 1.851 Ruby 2.861 10-1 Alexandrite 760 Cr:LISAF 3.568 10" Er:glass 6493.51 Population inversion 1.6 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 following cases. T(K) Energy gap N2/N 300 6328 A 300 11 GHz 300 6 eV 1000 6328 Å 1000 11 GHz 1000 6 eV 1.7 Two energy levels E2 and E, are separated by an energy gap E- E. Evaluate the temperature that 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/N Energy gap T(K) 0.01 6328 A 0.01 11 GHz 0.01 6 eV 0.1 6328 A 0.1 11 GHz 0.1 6 eV Power and energy 1.8 (a) A Nd:YAG laser has an energy of 0.4 joules/pulse, a repetition rate of 30 Hz, a pulsewidth of 20 nsec and has been focused into a spot of radius 0.5 mm. Calculste the average and peak power of the laser. Also calculate the energy density and the peak power density at the focus.
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