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Development of Surface Grating Distributed Feedback Quantum Cascade Laser for High Output Power and Low Threshold Current Density
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作者 刘颖慧 张锦川 +3 位作者 江建民 孙素娟 李沛旭 刘峰奇 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第2期60-62,共3页
We report on the room-temperature cascade laser (QCL) at λ -4.7μm. cw operation of a surface grating Both grating design and material distributed feedback (DFB) quantum optimization are used to decrease the thre... We report on the room-temperature cascade laser (QCL) at λ -4.7μm. cw operation of a surface grating Both grating design and material distributed feedback (DFB) quantum optimization are used to decrease the threshold current density and to increase the output power. For a high-reflectivity-coated 13-μm-wide and 4- mm-long laser, high wall-plug efficiency of 6% is obtained at 20℃ from a single facet producing over I W of ew output power. The threshold current density of DFB QCL is as low as 1.13kA/cm^2 at 10℃ and 1.34kA/cm2 at 30℃ in cw mode. Stable single-mode emission with a side-mode suppression ratio of about 30 dB is observed in tile working temperature range of 20-50℃. 展开更多
关键词 DFB QCL Development of Surface Grating distributed feedback quantum cascade Laser for High Output Power and Low Threshold Current Density
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Stable single-mode operation of a distributed feedback quantum cascade laser integrated with a distributed Bragg reflector 被引量:1
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作者 FENG-MIN CHENG ZHI-WEI JIA +7 位作者 JIN-CHUAN ZHANG NING ZHUO SHEN-QIANG ZHAI LI-JUN WANG JUN-QI LIU SHU-MAN LIU FENG-QI LIU ZHAN-GUO WANG 《Photonics Research》 SCIE EI 2017年第4期320-323,共4页
We report an index-coupled distributed feedback quantum cascade laser by employing an equivalent phase shift(EPS) of quarter-wave integrated with a distributed Bragg reflector(DBR) at λ~5.03 μm. The EPS is fabricate... We report an index-coupled distributed feedback quantum cascade laser by employing an equivalent phase shift(EPS) of quarter-wave integrated with a distributed Bragg reflector(DBR) at λ~5.03 μm. The EPS is fabricated through extending one sampling period by 50% in the center of a sampled Bragg grating. The key EPS and DBR pattern are fabricated by conventional holographic exposure combined with the optical photolithography technology, which leads to improved flexibility, repeatability, and cost-effectiveness. Stable single-mode emission can be obtained by changing the injection current or heat sink temperature even under the condition of large driving pulse width. 展开更多
关键词 MODE Stable single-mode operation of a distributed feedback quantum cascade laser integrated with a distributed Bragg reflector DBR
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