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Cross-section rendering of the maser cavity containing the DAP:PTP crystal, dielectric STO resonator and surrounding copper cavity. The STO resonator supported a TE01mode at a frequencyfmode= 1478 MHz. The DAP:PTP crystal was side-pumped through a hole in the copper cavity with 620, 570, and 532 nm laser light. The maser output was then coupled through a copper loop into an isolator, bandpass filter (BPF), and RF detector (a log detector) which could be read on an oscilloscope. A photo of the DAP:PTP crystal in the STO resonator is shown.

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