Si-Te acousto-optic modulator for fiber optic gas sensor based on midwave InGaAsSb/InAsSbP diode laser

摘要

Abstract: Modulator based on the amorphous Si-Te acousto-optic cell and operating in the mid-IR region has been manufactured and tested using 3.3 micrometer diode laser based on InGaAsSb/InAsSbP double heterostructure. Amplitude modulation efficiency for the laser beam coming from the end of a As$-2$/S$-3$/ fiber appeared to be not less than 70% allowing to use the cell in optical gas sensor applications. Methane gas fiber optic sensing was demonstrated using temperature tuning of the laser diode emission in the 3.28 - 3.34 micrometer range. !3