Departmental Bulletin Paper 半導体レーザを用いた廉価型sub-THz分光器の構成部品の改善
Improvement of parts in a low-cost sub-THz spectrometer using a laser diode

森川,治  ,  小野,高志  ,  池尻,拓樹

59 ( 1-2 )  , pp.29 - 38 , 2016-03-31 , 海上保安大学校
A newly developed lens positioner and an analogue-to-digital (AD) board are used in a low-cost sub-THz spectroscopic system with a multimode laser diode and photoconductive antennas (PAs). Among PAs, the spiral-type ones are preferable for the system, because they have high efficiency for emission and detection of the sub-THz radiation. However, positioning of the focusing lens requires high accuracy (~1μm) and then it takes much time. The new lens positioner utilizes leverage in a commercially available mirror holder and allows for more precise adjustment than the conventional one. In addition, the system employs a lock-in amplifier, which is rather expensive. The AD board costs about one third of the lock-in amplifier and enables cost reduction of the system. Further, the signal-to-noise ratio is improved by about 1.4 times and the measurement time can be reduced to half.

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