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The advantage of a hydrogen maser is in its short-term stability, however, with the same hydrogen masers, their performance are different. In 2004, four hydrogen masers were bought to time keeping laboratory of NTSC, two of which were made in USA, and the other two in China. In order to make full use of the hydrogen masers, it is necessary to study their performance which includes the short-term stability,...
A method for the frequency stabilisation of diode pumped solid-state lasers is suggested. The frequency drift of a monolithic integrated twisted-mode-cavity Nd:YAG laser has been compensated for by light absorption which induces temperature and frequency variations. The resulting frequency jitter was reduced to below 30 kHz, i.e. a relative frequency stability of Delta v/v approximately=10/sup -10/...
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