Feng Jin

TL;DR: A novel scheme that combines gain switching with passive Q switching of a miniature diode-pumped solid-state laser is proposed and implemented and a greater-than-tenfold reduction in timing jitter is demonstrated.

TL;DR: In this article, a high surface displacement detection sensitivity of the photo-electromotive-force (photo-EMF) pulsed laser vibrometer, combined with its tolerance to the presence and moderate temporal variations of optical speckles in the light beams, allows the detection of human heartbeats, breathing, and gross physical movement from essentially any part of a human subject's surface, even in the presence of clothing, all the while without limiting the interrogation points to specific locations like the chest and carotid areas.

TL;DR: Emissions from laser-induced breakdown spectroscopy in the mid-infrared (MIR) and long-wave infrared (LWIR) spectral regions were obtained for potential applications in explosive material sensing and revealed vibrational and rotational signatures of functional groups in molecules and fragments thereof.

TL;DR: The combination of atomic emission signatures derived from conventional ultraviolet–visible-near-infrared LIBS with fingerprints of intact molecular entities determined from IR LIBS promises to be a powerful tool for chemical detection.

TL;DR: In this article, a high sensitivity pulsed laser vibrometer that is capable of detecting optically rough surfaces vibrating with the displacement value of 75 pm as well as its application as a laser microphone is presented.