A simple low-cost system for detection of polycyclic aromatic hydrocarbon (PAH) in solution based on multiphoton ionization configuration is designed using a circulating ionization cell of 0.1 × 2 × 5 mm dim...A simple low-cost system for detection of polycyclic aromatic hydrocarbon (PAH) in solution based on multiphoton ionization configuration is designed using a circulating ionization cell of 0.1 × 2 × 5 mm dimension with quartz optical window. Fourth harmonic emission of Nd:YAG laser (266 nm, 6 ns, 10 Hz, and 2 mJ) and second harmonic generation of distributed feedback dye laser (278 - 286 nm, 20 ps, 10 Hz, and 300 μJ) were used as the ionization source. A high voltage of 800 V was applied to separate the ions after ionization. The photocurrent includes a sharp peak and a broad tail indexed to electron and ion currents, respectively. The lowest concentration of anthraxcene (C14H10) in order of few nano-grams per milliliter was detected by this multiphoton ionization configuration.展开更多
A single mode operation of 1.55μm-wavelength GaInAsP/InP membrane BH-DFB laser was demonstrated under RT-CW optical pumping with a threshold power of 1.5 mW and a sub-mode suppression-ratio (SMSR) of 42 dB. We also d...A single mode operation of 1.55μm-wavelength GaInAsP/InP membrane BH-DFB laser was demonstrated under RT-CW optical pumping with a threshold power of 1.5 mW and a sub-mode suppression-ratio (SMSR) of 42 dB. We also demonstrated a membrane-based laser array which covers a wavelength span of 72 nm with a fluctuation of less than±1.2nm.展开更多
文摘A simple low-cost system for detection of polycyclic aromatic hydrocarbon (PAH) in solution based on multiphoton ionization configuration is designed using a circulating ionization cell of 0.1 × 2 × 5 mm dimension with quartz optical window. Fourth harmonic emission of Nd:YAG laser (266 nm, 6 ns, 10 Hz, and 2 mJ) and second harmonic generation of distributed feedback dye laser (278 - 286 nm, 20 ps, 10 Hz, and 300 μJ) were used as the ionization source. A high voltage of 800 V was applied to separate the ions after ionization. The photocurrent includes a sharp peak and a broad tail indexed to electron and ion currents, respectively. The lowest concentration of anthraxcene (C14H10) in order of few nano-grams per milliliter was detected by this multiphoton ionization configuration.
文摘A single mode operation of 1.55μm-wavelength GaInAsP/InP membrane BH-DFB laser was demonstrated under RT-CW optical pumping with a threshold power of 1.5 mW and a sub-mode suppression-ratio (SMSR) of 42 dB. We also demonstrated a membrane-based laser array which covers a wavelength span of 72 nm with a fluctuation of less than±1.2nm.
