Title :
Power and spatial mode measurements of sideband generated, spatially filtered, submillimeter radiation
Author :
Mueller, Eric R. ; Waldman, Jerry
Author_Institution :
Submillimeter Technol. Lab., Massachusetts Univ., Lowell, MA, USA
fDate :
10/1/1994 12:00:00 AM
Abstract :
The first coherent measurement of submillimeter-wave sideband generator (SBG) output power is reported here. This SBG utilizes a submillimeter laser, microwave synthesizer, and high frequency Schottky diode to produce tunable radiation. Record efficiency and output power (10.5 μW) at a drive frequency of 1.6 THz has been obtained, and SBG radiation was efficiently separated from the laser driver with Si etalons. The power measurements were made using a dual CO2-submillimeter laser system and two Schottky diodes, one as the sideband generator and one as the receiver. The SBG efficiency of four different models of University of Virginia (UVa) diodes were studied and the first measurement of the output mode of the sideband (without the unshifted laser present) was also performed. Finally, confirmation of the optimal parameters for coupling a Gaussian beam into a corner-reflector mounted Schottky diode is presented
Keywords :
Schottky-barrier diodes; carbon compounds; gas lasers; measurement by laser beam; microwave generation; microwave measurement; power measurement; solid-state microwave devices; submillimetre wave devices; 1.6 THz; 10.5 muW; CO2; Gaussian beam; corner-reflector mounted Schottky diode; dual CO2-submillimeter laser system; high frequency Schottky diode; microwave synthesizer; output mode; power measurements; sideband generator; spatial mode measurements; spatially filtered radiation; submillimeter radiation; tunable radiation; Frequency synthesizers; High power microwave generation; Laser modes; Masers; Power generation; Power lasers; Power measurement; Schottky diodes; Submillimeter wave measurements; Tunable circuits and devices;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
