Definition

Noun: A gas maser is a specific type of maser (Microwave Amplification by Stimulated Emission of Radiation) in which the active medium, where the amplification of microwave radiation occurs, is a gas. The microwave radiation interacts with the molecules of this gas to produce a coherent beam.

Usage

The term is used in the context of physics, quantum electronics, and precision measurement technologies. It describes the physical implementation of a maser device. - The first working maser was a gas maser using ammonia. - Researchers are developing a more stable hydrogen gas maser for use in atomic clocks.

Advanced Usage

• Scientific Context: In advanced physics, a gas maser is often discussed concerning its linewidth, stability, and the specific quantum transitions of the gas molecules (e.g., ammonia, hydrogen) that are exploited.
• Technical Specifications: The performance of a gas maser, such as its frequency stability, is a key topic in metrology and deep-space communication.

Variants and Related Words

• Maser (n): The broader category of devices for amplifying microwave radiation.
• Ammonia maser (n): A common type of gas maser using ammonia gas.
• Hydrogen maser (n): A highly stable type of gas maser using hydrogen, important for timekeeping.

Synonyms

• Molecular amplifier (in the specific context of using gas molecules).

Related Phrases

• Maser oscillation: The process of generating coherent microwave emission, which occurs in a gas maser.
• Active maser medium: The gain medium; for a gas maser, this is the specific gas used.

Noun

1. a maser in which microwave radiation interacts with gas molecules