Title :
Development of high accuracy power meter in terahertz region
Author :
Nishina, Shigeki ; Imamura, Motoki
Author_Institution :
ADVANTEST Corp., Sendai, Japan
Abstract :
A calorimetric power meter has been developed for the highly accurate power measurement of terahertz spatial light. A solid-state terahertz absorber is used when constant terahertz wave absorption occurs due to the dielectric loss of the absorber and the sensor frequency sensitivity can be calibrated by measuring the reflectance characteristics of the absorber in the terahertz region. The stable absorption of the absorber in the terahertz region reduces the variation in sensitivity and provides a highly accurate power measurement. Over a frequency range between 0.4 THz and 10 THz, this system can provide users with a power meter that can measure power with a small uncertainty of 8% (2σ).
Keywords :
calorimetry; dielectric losses; light absorption; power measurement; power meters; reflectivity; sensitivity; terahertz wave devices; absorber reflectance characteristics; constant terahertz wave absorption; frequency 0.4 THz to 10 THz; high accuracy calorimetric power meter development; sensor frequency sensitivity variation reduction; solid-state terahertz absorber dielectric loss; terahertz region; terahertz spatial light power measurement; Absorption; Accuracy; Frequency measurement; Power measurement; Quantum cascade lasers; Sensitivity; Standards;
Conference_Titel :
Infrared, Millimeter, and Terahertz waves (IRMMW-THz), 2014 39th International Conference on
Conference_Location :
Tucson, AZ
DOI :
10.1109/IRMMW-THz.2014.6956136
