Abstract
A novel type of hydrogen (H 2 ) sensor utilizing a thin film of palladium (Pd) deposited on the ridge of an edge-emitting laser has been designed, fabricated, and tested. This Pd film is known to react to H 2 , yielding a change in the complex refractive index and thus also the laser's output power. As the propagating wave travels through the device, the evanescent portions of the wave interact with these changing optical properties, yielding a change in optical output power as a function of H 2 concentration. The measurement results show that there is a definite change in output power as the H 2 concentration is increased. The measured sensitivity of these devices is shown to be about a 2% fractional power change per percent H 2 .
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