Title :
Multiple-frequency generation of sub-terahertz radiation by multimode LD excitation of photoconductive antenna
Author :
Tani, Masahiko ; Matsuura, Shuji ; Sakai, Kiyomi ; Hangyo, Masanori
Author_Institution :
Commun. Res. Lab., Minist. of Posts & Telecommun., Kobe, Japan
fDate :
9/1/1997 12:00:00 AM
Abstract :
Multiple-frequency coherent radiation in the sub-terahertz region was generated by excitation of a photoconductive antenna with a commercially available multimode laser diode (LD). The origin of the radiation was the current modulations in the photoconductive antenna caused by the optical beats between the longitudinal modes of the LD. An interferometric spectral measurement showed line spectra at frequency multiples of 52 GHz beyond 400 GHz. This result indicates that the photoconductive antenna with a multimode LD excitation can achieve a wavelength-selectable coherent radiation source in the sub-terahertz region with a very simple and compact device configuration
Keywords :
laser beam applications; laser modes; multiwave mixing; optical modulation; photoconducting devices; semiconductor lasers; signal generators; submillimetre wave mixers; 400 GHz; coherent radiation source; compact device configuration; current modulation; interferometric spectral measurement; longitudinal modes; multimode LD excitation; multimode laser diode; multiple-frequency generation; optical beats; photoconductive antenna; sub-terahertz radiation; wavelength-selectable radiation source; Antenna measurements; Current measurement; Diode lasers; Frequency measurement; Laser excitation; Optical interferometry; Optical modulation; Photoconducting devices; Photoconductivity; Wavelength measurement;
Journal_Title :
Microwave and Guided Wave Letters, IEEE
