An innovative gas sensor with on-chip reference using a monolithic twin laser is proposed. In this sensor a monolithic twin laser generates two closer laser beams with slight different wavelengths alternatively, one p...An innovative gas sensor with on-chip reference using a monolithic twin laser is proposed. In this sensor a monolithic twin laser generates two closer laser beams with slight different wavelengths alternatively, one photodiode is used to catch both absorption and reference signals by time division multiplexing. The detection of nitrous oxide adopting this scheme using a 2.1 I^m antimonide laser and an InGaAs photodiode has been demonstrated experimentally with detection limit below i ppm. Using this on chip reference scheme the fluctuations from the optical path and devices can be compensated effectively; the sensor system is simplified distinctly.展开更多
We investigate the properties of symmetrical triangular quantum wells composed of InGaAs/InAs chirped superlattice, which is grown by gas source molecular beam epitaxy via digital alloy method. In the quantum well str...We investigate the properties of symmetrical triangular quantum wells composed of InGaAs/InAs chirped superlattice, which is grown by gas source molecular beam epitaxy via digital alloy method. In the quantum well structure tensile AlInGaAs are used as barriers to partially compensate for the significant compressive strain in the wells, the strain compensation effects are confirmed by x-ray measurement. The photoluminescence spectra of the sample are dominated by the excitonic recombination peak in the whole temperature range. The thermal quenching, peak energy shift and line-width broadening of the PL spectra are analysed in detail, the mechanisms are discussed.展开更多
报道了一种基于氧化镁掺杂的周期性极化铌酸锂的高功率、窄线宽的2.1μm近简并单谐振光学参量振荡器.该光学参量振荡器使用一台自行搭建的近基模调Q线偏振Nd:YAG激光器作为抽运源,抽运光经过聚焦后二次抽运四镜驻波腔结构的周期性极化...报道了一种基于氧化镁掺杂的周期性极化铌酸锂的高功率、窄线宽的2.1μm近简并单谐振光学参量振荡器.该光学参量振荡器使用一台自行搭建的近基模调Q线偏振Nd:YAG激光器作为抽运源,抽运光经过聚焦后二次抽运四镜驻波腔结构的周期性极化铌酸锂光学参量振荡器,实现了稳定的高功率和高光束质量2.1μm激光输出.利用体光栅作为输出镜,在重复频率为10 k Hz时,产生的2.1μm激光线宽小于2 nm,最高功率为8.4 W,水平方向和竖直方向的光束质量因子M2分别为3.8和4.1.展开更多
文摘An innovative gas sensor with on-chip reference using a monolithic twin laser is proposed. In this sensor a monolithic twin laser generates two closer laser beams with slight different wavelengths alternatively, one photodiode is used to catch both absorption and reference signals by time division multiplexing. The detection of nitrous oxide adopting this scheme using a 2.1 I^m antimonide laser and an InGaAs photodiode has been demonstrated experimentally with detection limit below i ppm. Using this on chip reference scheme the fluctuations from the optical path and devices can be compensated effectively; the sensor system is simplified distinctly.
文摘We investigate the properties of symmetrical triangular quantum wells composed of InGaAs/InAs chirped superlattice, which is grown by gas source molecular beam epitaxy via digital alloy method. In the quantum well structure tensile AlInGaAs are used as barriers to partially compensate for the significant compressive strain in the wells, the strain compensation effects are confirmed by x-ray measurement. The photoluminescence spectra of the sample are dominated by the excitonic recombination peak in the whole temperature range. The thermal quenching, peak energy shift and line-width broadening of the PL spectra are analysed in detail, the mechanisms are discussed.
文摘报道了一种基于氧化镁掺杂的周期性极化铌酸锂的高功率、窄线宽的2.1μm近简并单谐振光学参量振荡器.该光学参量振荡器使用一台自行搭建的近基模调Q线偏振Nd:YAG激光器作为抽运源,抽运光经过聚焦后二次抽运四镜驻波腔结构的周期性极化铌酸锂光学参量振荡器,实现了稳定的高功率和高光束质量2.1μm激光输出.利用体光栅作为输出镜,在重复频率为10 k Hz时,产生的2.1μm激光线宽小于2 nm,最高功率为8.4 W,水平方向和竖直方向的光束质量因子M2分别为3.8和4.1.
