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Extra info for Experiments with Modified Mucronate Electrodes
What makes gas lasers highly efficient is that there always exist in gaseous media many transitions capable of laser emission that terminate on levels above the ground state. It is essential that the atoms, once they have fallen back on such terminal levels, leave them as fast as they arrive and return instantly to the ground state, where they are again available for regenerating the populations of the active levels. Deexcitation of the terminal levels can be, and usually is, accelerated by adding to the laser medium some other appropriate gases, which provoke 23 4.
7 L I R e s o n a n c e condition in a standing-wave laser cavity of l e n g t h L. FIG. 8 G a i n profile of a typical laser s y s t e m . T h e available axial-mode frequencies are equally spaced, separated b y c/2L, where L is t h e cavity length. T h e centrally-located frequency coincides w i t h t h e natural a t o m i c transition frequency, w,o. 18 I. LASERS AND PHYSICS Radiation emitted by a laser, just as ordinary light, could take place throughout the Doppler-broadened distribution of frequencies (Fig.
It is essential that the atoms, once they have fallen back on such terminal levels, leave them as fast as they arrive and return instantly to the ground state, where they are again available for regenerating the populations of the active levels. Deexcitation of the terminal levels can be, and usually is, accelerated by adding to the laser medium some other appropriate gases, which provoke 23 4. TYPES O F LASERS He Ne He Ne He Ne He Ne an t h e ground states (a). H e l i u m a t o m s are excited b y electron bombardment ( b ) and subsequently transfer t h e i r surplus energy, v i a collisions, t o n e o n a t o m s w h i c h are excited t o high-energy levels (c).