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正Distributed feedback(DFB) quantum cascade lasers(QCLs) in continuous-wave(CW) mode emitting atλ≈7.6μm are presented.Holographic lithography was used to fabricate the first-order distributed feedback grating. For a high-reflectivity-coated QCL with 14.5-μm-wide and 3-mm-long cavity,CW output powers of 300 mW at 85 K and still 10 mW at 270 K are obtained.Single-mode emission with a side-mode suppression ratio(SMSR) of about 30 dB and a wide tuning range of ~300 nm in the temperature range from 85 to 280 K is observed. 相似文献
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本文提出了一种由分子束外延生长的应变补偿InP基InGaAs/InAlAs量子级联探测器。该探测器工作中心波长位于4.3微米,工作温度可达室温。在室温下其响应率为1.27 mA/W,热噪声限探测率为1.02×〖10〗^7 cm?〖Hz〗^(1?2) W^(-1)。在80K温度下,该探测器的响应率和热噪声限探测率分别为14.55 mA/W 和 1.26×〖10〗^10 cm?〖Hz〗^(1?2) W^(-1)。其响应波段与大气二氧化碳的最强吸收范围相对应,因此该探测器十分适合于温室气体检测。 相似文献
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