(DURIP) CONTINUOUS-WAVE TERAHERTZ SYSTEM FOR INTEGRATED TIME- AND FREQUENCY-DOMAIN MEASUREMENTS
Abstract
Terahertz time-domain spectroscopy (THz-TDS) is poorly suited to a number of critical terahertz research applications. The low average power dictates a form of averaging that requires the measured scene to remain quasi-static (repeating exactly for every repetition of the terahertz pulse) over several minutes. The broad bandwidth results in low spectral power density. Finally, the spectral linewidth is not narrow enough for many applications. Laser-driven, continuous-wave (CW) terahertz systems are a complementary alternative that use synchronized fiber lasers to make single-frequency THz waves. These provide coherent measurements having high dynamic range (greater than 70 dB), high tunability (0.05 – 2.7 THz) high average power (up to 100 microW), and, importantly, very narrow linewidth (less than 10 MHz), resulting in very high spectral power density. However, their time-resolution is orders of magnitude less than TDS, meaning such systems do not capture rapid dynamics. These descriptions make it clear that the combination of CW and pulsed terahertz systems represents an opportunity to perform one-of-a-kind research studies.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Mar 07, 2023
- Source ID
- FA95502110243
Entities
People
- John O Hara
Organizations
- Air Force Office of Scientific Research
- Oklahoma State University–Stillwater
- United States Air Force