A laser-aided technique has been used for measuring time-resolved optical transmissions of xenon flash lamps at numerous visible and infrared wavelengths, flash-lamp current densities, lamp diameters, pulse durations, and xenon pressures. Long-pulse (~ 600-μs) and short-pulse (~ 10-μs) cases specific for optically pumping solid-state, dye, and atomic iodine lasers were studied. Opacity measurements were made for flash-lamp current densities up to 30 kA/cm2. Flash lamps having fused silica envelope diameters between 0.8 and 4.5 cm and xenon pressures between 2 and 450 Torr were investigated in these experiments. Xenon temperatures between 6000 and 25,000 K were estimated from the frequencies of observed arc-acoustic oscillations. Important applications for increasing the pumping efficiencies of large Nd:glass and photolytic iodine laser amplifiers are discussed.
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Transmission–Absorption Coefficients of Long-Pulse Xenon Flash Lampsa
No.
Wavelength (μm)
Laser Source
Lamp Transmission T
Absorption Coefficient (cm−1)
1
3.391
Ne I
0.012 ± 0.008
3.38 ± 0.8
2
1.152
Ne I
0.089 ± 0.06
2.41 ± 0.2
3
1.064
Nd+3
0.21 ± 0.03
2.00 ± 0.11
4
0.647
Kr II
0.150 + 0.14
1.46 ± 0.07
5
0.633
Ne I
0.195 ± 0.018
1.26 ± 0.07
6
0.568
Kr II
0.279 ± 0.012
0.98 ± 0.03
7
0.488
Ar II
0.269 ± 0.015
1.01 ± 0.04
8
0.482
Kr II
0.299 ± 0.004
0.93 ± 0.01
9
0.476
Kr II
0.334 ± 0.005
0.84 ± 0.01
Measurements were made at j = 2.54 kA/cm2, 1.5-cm-bore flash lamp with cerium-doped fused silica walls, 450-Torr xenon pressure, and circuit time constant 600 μs.
Measurements were made at current density of 10.8 kA/cm2 with a 1.8-cm-bore flash lamp, Suprasil walls, 30-Torr xenon pressure, and circuit time constant 10 μs.
Mean 0.094 ± 0.018 cm/kA. The mean value of g including the long-pulse results in Table 2 is 0.112 ± 0.037 cm/kA.
Table 4
Estimated Xenon Temperatures from Arc-Acoustic Frequencies (1.8-cm-Bore Flash Lamps)a
Arc-acoustic oscillation dat were observed in absorption at the 488-nm wavelength with a xenon fill of 90 Torr. The circuit time constant (3√LC) was 10 μs.
Local thermodynamic equilibrium.
Tables (4)
Table 1
Transmission–Absorption Coefficients of Long-Pulse Xenon Flash Lampsa
No.
Wavelength (μm)
Laser Source
Lamp Transmission T
Absorption Coefficient (cm−1)
1
3.391
Ne I
0.012 ± 0.008
3.38 ± 0.8
2
1.152
Ne I
0.089 ± 0.06
2.41 ± 0.2
3
1.064
Nd+3
0.21 ± 0.03
2.00 ± 0.11
4
0.647
Kr II
0.150 + 0.14
1.46 ± 0.07
5
0.633
Ne I
0.195 ± 0.018
1.26 ± 0.07
6
0.568
Kr II
0.279 ± 0.012
0.98 ± 0.03
7
0.488
Ar II
0.269 ± 0.015
1.01 ± 0.04
8
0.482
Kr II
0.299 ± 0.004
0.93 ± 0.01
9
0.476
Kr II
0.334 ± 0.005
0.84 ± 0.01
Measurements were made at j = 2.54 kA/cm2, 1.5-cm-bore flash lamp with cerium-doped fused silica walls, 450-Torr xenon pressure, and circuit time constant 600 μs.
Measurements were made at current density of 10.8 kA/cm2 with a 1.8-cm-bore flash lamp, Suprasil walls, 30-Torr xenon pressure, and circuit time constant 10 μs.
Mean 0.094 ± 0.018 cm/kA. The mean value of g including the long-pulse results in Table 2 is 0.112 ± 0.037 cm/kA.
Table 4
Estimated Xenon Temperatures from Arc-Acoustic Frequencies (1.8-cm-Bore Flash Lamps)a
Arc-acoustic oscillation dat were observed in absorption at the 488-nm wavelength with a xenon fill of 90 Torr. The circuit time constant (3√LC) was 10 μs.
Local thermodynamic equilibrium.
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