By W. P. and Thurston, R. N.(Ed.) Mason
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Extra resources for Physical acoustics, vol.6: principles and methods
Sample text
This method is proposed, first, to form a sufficient density of copper vapours in transient conditions, and secondly, it was hoped to lengthen the lasing pulse due to the removal of metastable atoms from the active medium because of the relatively high speed of movement of copper atoms. A vacuum chamber was constructed for this purpose in which there were two devices for exploding copper or gold wires, made in the form of an atomic gun. Some time after the explosion when the copper atoms reached the axis of the gas-discharge tube a high voltage of 20 kV was applied to the electrodes.
In [43] a laser system was constructed in which the cost of obtaining the atoms of the working medium was minimized due to the fact that a small area (<10 cm 2) of the cathode and a high-speed gas flow were used. , to produce multicolour laser radiation) inserted into the working volume together or separately, with the output power at different colours varying with the characteristic time of ~10 ms. 13. Schematic of the laser tube [43]. from the point of view of implementation of efficient lasing at new transitions.
If the finished quartz blank is available, the entire process of the preparation of the tube together with treatment takes 1–2 days. In the process, it became clear that, after appropriate treatment, it is possible to ensure relatively stable lasing conditions. g. air) has no strong effect on the lasing characteristics. Neon is typically used as the buffer gas. Lasing was also observed with helium, argon, xenon and air used as a buffer gas. Full degassing of the discharge tube in the laboratory could not be achieved.