Broadband terahertz-power extracting by using electron cyclotron maser

Area of Science:

• Physics
• Engineering
• Electromagnetics

Background:

• Terahertz (THz) applications demand high-performance, room-temperature THz sources.
• Gyrotrons, based on electron cyclotron maser principles, generate high-power THz radiation but typically operate at single frequencies or narrow bands.

Purpose of the Study:

• To propose and investigate a frequency tuning scheme for terahertz gyrotrons.
• To achieve simultaneous high performance, broadband output, coherence, and high power.

Main Methods:

• Sequential switching among multiple whispering-gallery modes within the gyrotron cavity.
• Utilizing a pre-bunched circuit for single-mode wide-band tuning.
• Implementing wide-range magnetic tuning combined with mode switching.

Main Results:

• Demonstrated potential for broadband radiation with a 100-GHz-level bandwidth.
• Identified frequency-dependent effective electrical length as a limit to wider bandwidths.
• Investigated mode competition and engineering techniques for practical feasibility.

Conclusions:

• The proposed multi-mode-switching scheme offers a promising solution for broadband, high-power terahertz gyrotrons.
• This approach could significantly advance terahertz technology and bridge the 'terahertz gap'.