Passive Hydrogen MASER
CH1-76 - Precise Time and Frequency, Inc. (PTF)
The CH1-76 Passive Hydrogen MASER is a frequency standard of a passive type. As in an active MASER the CH1-76 comprises a beam source, a sorting magnet and a storage quartz bulb situated in a cavity and coated with fluoroplastic. The Passive MASER differs from the Active MASER in that an atom medium in a bulb is not self-excited and provides an atom emission
caused by an external signal the frequency of which is nearly equal to the hydrogen atoms emission frequency. Thanks to this the requirements to a cavity quality (Q) are reduced.