【摘 要】
：
We report lasing properties of distributed feedback quantum cascade lasers (DFB QCLs) including a doublephonon-resonance active region, at wavelength of about 8
【机 构】
：
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and
论文部分内容阅读
We report lasing properties of distributed feedback quantum cascade lasers (DFB QCLs) including a doublephonon-resonance active region, at wavelength of about 8.4 μm. A broad gain spectrum is generated due to the coupling between the lower laser level in the active region and the levels in the injector, and is demonstrated by current. As a result, the DFB QCLs employing different grating periods exhibit a wavelength span of 0.18μm at room temperature and total wavelength coverage of 0.28μm at various heat sink temperatures. A high side mode suppression ratio of about 30 dB and a low threshold current density of 1.78 kA/cm2 are achieved as the lasers operate at room temperature in pulsed mode.
其他文献
We investigate the field ionization spectra of ultracold cesium Rydberg atoms in dc electric field. The ionization thresholds of different electric fields are m
随着2020年初台湾地区两项选举投票日益临近,民进党不择手段造谣所谓“大陆介入台湾选举”,持续炒作香港问题,阻挠两岸正常交流合作,在岛内制造强化对大陆的敌意对抗氛围,民
Silicon nanotubes (SiNTs) are novel one-dimensional nanomaterials, which have potential applications in nanophotoelectric devices, sensors and field-emission de
Oblique detonation structures induced by the wedge in the supersonic combustible gas mixtures are simulated numerically. The results show that the stationary ob
Zirconium oxide (ZrO2) thin films are deposited at room temperature by cathodic arc at substrate biases of 0V,-60V and-120V, respectively. The crystal structure
We investigate the third-order nonlinear optical properties of six novel fullerene derivatives under picosecond laser excitation by Z-scan technique.The experim
今年4月,在苏宁电器召开的2011年业绩说明会上,苏宁电器董秘任峻透露,今年下半年,苏宁在线商城苏宁易购将推出自有品牌服装。时隔3个月后,苏宁对此就有了新动作。有报道称,苏
TiO2 thin films are prepared on fused silica with conventional electron beam evaporation deposition. After annealed at different temperatures for 4 h, the spect
中国本土广告公司数以万计,然而真正实力强大、理念先进、发展潜力巨大的又有几个?本土广告公司是否真的一无是处,还是可圈可点?本土广告公司的弱点是什么?未来的发展方向在
We use the Kruskal time coordinate T to define the initial time. By this way, the stability study naturally becomes the one connected with the two regions, i.e.