1.4 The Resonance Fluorescence Method for Hydrogen Plasma …
33
Fig. 1.21 Dependence of fluorescence intensity in time under the exciting of hydrogen plasma by
dye laser radiation with lamp pumping. Reprinted from [54] with permission
the watch window (3); the monochromator MDR-2 (4); the radiation detector PMT84 (5); the pulse amplifier (6); the oscilloscope C8-2 (7); the laser pulse energy meter
(8); the monochromator DM-1 with the microscope for laser oscillation frequency
control (9).
Beam cross section in the chamber was about 1 cm
2 , solid angle of light acquisition
was 5 × 10
−3 . Fluorescence radiation was observed under the angle of 90° to the
laser beam. Fluorescence volume was designed on the monochromator slot with
the reduction of 1:5. For the detection of absolute value of hydrogen neutral atoms
concentration, the experiments were carried out on Rayleigh scattering of gas laser
radiation. Argon has been chosen as working gas. Gas pressure in the discharge
chamber was about 1 atm. Figure 1.21 shows the results of measuring fluorescence
intensity in time under plasma excitation by dye laser radiation with lamp pumping.
The curve (1) is related to the discharge standard conditions (discharge current is
27 kA) after long training of the chamber by heating and by discharge. The curve (2)
corresponds to the conditions with less thorough training of the chamber (discharge
current is 17 kA). Hydrogen neutral atoms concentration near discharge maximum
calculated by the amplitude of a signal is equal to 1 × 10
9 cm
−3 and 2 × 10
9 cm
−3 ,
respectively.
33
Fig. 1.21 Dependence of fluorescence intensity in time under the exciting of hydrogen plasma by
dye laser radiation with lamp pumping. Reprinted from [54] with permission
the watch window (3); the monochromator MDR-2 (4); the radiation detector PMT84 (5); the pulse amplifier (6); the oscilloscope C8-2 (7); the laser pulse energy meter
(8); the monochromator DM-1 with the microscope for laser oscillation frequency
control (9).
Beam cross section in the chamber was about 1 cm
2 , solid angle of light acquisition
was 5 × 10
−3 . Fluorescence radiation was observed under the angle of 90° to the
laser beam. Fluorescence volume was designed on the monochromator slot with
the reduction of 1:5. For the detection of absolute value of hydrogen neutral atoms
concentration, the experiments were carried out on Rayleigh scattering of gas laser
radiation. Argon has been chosen as working gas. Gas pressure in the discharge
chamber was about 1 atm. Figure 1.21 shows the results of measuring fluorescence
intensity in time under plasma excitation by dye laser radiation with lamp pumping.
The curve (1) is related to the discharge standard conditions (discharge current is
27 kA) after long training of the chamber by heating and by discharge. The curve (2)
corresponds to the conditions with less thorough training of the chamber (discharge
current is 17 kA). Hydrogen neutral atoms concentration near discharge maximum
calculated by the amplitude of a signal is equal to 1 × 10
9 cm
−3 and 2 × 10
9 cm
−3 ,
respectively.