提出并实现了新型隧道再生耦合大光腔半导体激光器，近场光斑宽度达到1μm ，较普通半导体激光器提高了一个数量级，有效地解决了普通半导体激光器由于发光面积狭窄而导致的端面灾变性毁坏和垂直发散角大的问题。采用低压金属有机物化学气相沉积方法生长了以C和Si分别作为掺杂剂的Al Ga As 隧道结、Ga As/In Ga As 应变量子阱有源区和新型半导体激光器外延结构，并制备出器件，其垂直发散角为20°，阈值电流密度为277APcm2，斜率效率在未镀膜时达到0.80WPA。

The thermal property of tunnel-regenerated multiactive-region (TRMAR) light-emitting diodes (LEDs) is studied in detail in this letter. These devices have the advantages of high quantum efficiency and high output optical power. To obtain the same output optical power, it has been shown that the thermal performance for TRMAR LEDs is much better than that of conventional ones. The heat generated from the reverse-biased tunneling junction in TRMAR LEDs is small and can be neglected as compared with heat produced from the active region as illustrated in scanning thermal microscopy result. An experimental comparison shows that the improved input power dependence on the luminescence intensity proves that TRMAR LEDs have better thermal properties than those of conventional ones.

In order to resolve the prevailing problems in conventional light-emitting diodes (LEDs), novel high-efficiency tunneling-regenerated multi-active-region (TRMAR) LEDs are proposed, which have such advantages as low heat generation, carrier overflow level and non-radiation recombination rate and whose quantum efficiency and the output optical power can be scaled with the number of the active regions. Experiments show that the on-axis luminous intensity of TRMAR LEDs increases linearly with the number of active regions. The novel LEDs have high quantum efficiency under low current injection and their maximum on-axis luminous intensity exceeds 5 candelas at 20 mA current injection at the peak wavelength of 625nm with a 15

The main problems of conventional multi-quantum well infrared photodetectors (QWIPs) were discussed. In order to overcome the limitations of the conventional QWIPs, such as small photocurrent, high dark current and low response speed, novel QWIPs in which photocurrent increases with the number of well were proposed. The novel structure with several wells were calculated and analyzed in detail, and successfully fabricated. The dark current lower than conventional QWIPs by about one order of magnitude was obtained, well in agreement with theoretical value. I-V characteristics of the novel QWIPs with six wells has been presented, and six related negative differential resistance regions were observed at positive bias. The absorption photocurrents of the novel QWIPs at 77 K were found to increase with well numbers, confirming the mechanism of the new structure. Furthermore, the transportation of the optoelectronic and some other problems of the QWIPs were discussed.

Tunnel-regenerated multiple-active-region (TRMAR) light-emitting diodes (LEDs) with high quantum efficiency and high brightness have been proposed and fabricated. We have proved experimentally that the efficiency of the electrical luminescence and the on-axis luminous intensity of such TRMAR LEDs scaled linearly approximately with the number of the active regions. The on-axis luminous intensity of such TRMAR LEDs with only 3μm GaP current spreading layer have exceeded 5 cd at 20 mA dc operation under 15° package. The high-quantum-efficiency and high-brightness LEDs under the low injection level were realized. © 2001 American Institute of Physics.

针对大功率半导体激光器面临的主要困难，提出并实现了一种隧道再生多有源区耦合大光腔高效大功率半导体激光器机理。该机理能有效地解决光功率密度过高引起的端面灾变性毁坏、热烧毁和光束质量差等大功率激光器存在的主要问题。采用低压金属有机化合物气相淀积方法生长了以碳和硅作为掺杂剂的GaAs隧道结、GaAs/In2GaAs 应变量子阱有源区和新型多有源区半导体激光器外延结构，并制备了高性能大功率980nm激光器件。三有源区激光器外微分量子效率达2.2，2A驱动电流下单面未镀膜激光输出功率高达2.5W。