共查询到19条相似文献,搜索用时 593 毫秒
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提出了一种新的激光器腔面钝化方法.先用(NH4)2S溶液硫化解理后的激光器腔面,然后使用磁控溅射方法对激光器的前腔面镀ZnS钝化膜、后腔面镀Si/SiO2高反射膜.ZnS钝化层光学厚度为λ/4,在中心波长为808 nm处透过率可达95.5%.钝化前激光器的光学灾变损伤(COD)阈值为1.6 W,钝化后为2.0 W,提高了25%倍;未镀膜的激光器阈值电流为0.25 A,经硫化再镀ZnS后阈值电流为0.20 A,降低了20%.实验结果表明,经硫化后溅射ZnS对激光器腔面具有良好的钝化和增透效果. 相似文献
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腔面光学灾变(COD)是影响半导体激光器高功率输出和可靠性的重要问题。不同腔面膜的器件,其腔面光学灾变阈值差别很大。使用离子辅助沉积(IBAD)的工艺可以使基片表面更清洁,膜层更为牢固致密,同时可以改善由吸收、散射等损耗带来的激光输出功率下降。采取N2氛围中在激光器的腔面上涂镀不同的增透膜与介质高反膜来提高腔面光学灾变阈值。 以980 nm半导体激光器为例,进行对比实验,从老化结果中可以看到不同工艺与不同材料选择下腔面膜的腔面光学灾变的明显改善。 相似文献
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研究了808 nm量子阱脊型波导结构掺铝半导体激光器在空气中解理不同镀膜方法对激光损伤阈值的影响.将半导体激光器管芯分别采用前后腔面不镀膜、前后腔面镀反射膜和前后腔面先镀钝化薄膜,再镀腔面反射膜的方法进行对比.测试半导体激光器输出功率的结果表明:腔面镀钝化薄膜的方法比只镀腔面反射膜的方法的激光损伤闽值高36%,并且能有效防止灾变性光学镜面损伤,同时,还分析了半导体激光器管芯和光学薄膜之间发生的物理效应.在大功率半导体激光器芯片腔面上镀钝化薄膜是提高其激光损伤阈值的一个行之有效的方法. 相似文献
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高透腔面大功率650 nm红光半导体激光器 总被引:1,自引:1,他引:1
利用石英闭管法对金属有机化学气相沉积(MOCVD)外延生长的应变量子阱(MQW)650 nm AlGaInP/GaInP材料进行选择区域扩Zn,使扩Zn区域的光致发光(PL)谱的峰值蓝移达175 meV,形成对650 nm波长激光器的高透腔面,有益于减少激光器腔面光吸收,增加了激光器退化的光学灾变损伤(COD)阈值.后工艺制作出条宽100μm,腔长1 mm的增益导引激光器,实现了红光半导体激光器的大功率输出.激光器阈值电流为382 mA,在2.28 A工作电流时达到光学灾变损伤阈值,最大连续输出光功率1.55 W,外微分量子效率达到0.82 W/A. 相似文献
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针对半导体激光器腔面光学灾变损伤的发生机制,设计了一种单管芯半导体激光器腔面真空解理钝化工艺方法。在真空中解理并且直接对半导体激光器腔面蒸镀钝化膜,提出用ZnSe材料作为单管芯半导体激光器真空解理工艺的钝化膜材料,发现利用真空解理钝化工艺方法和ZnSe材料作为钝化膜可以使器件输出功率提高23%。通过电致发光(EL)对半导体激光器腔面损伤机理进行分析。进一步说明对915 nm半导体激光器制备工艺中引入真空解理钝化工艺技术并且选择ZnSe作为钝化膜可以有效保护半导体激光器腔面,提高器件可靠性。 相似文献
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降低VCSELs激射阈值途径的理论研究 总被引:11,自引:2,他引:9
针对量子阱有源层的结构特点,考虑增益和载流子浓度呈对数关系,建立量子陆垂直腔面发射半导体激光器(VCSEL)的速率方程,导出了阈值电流密度的解析表达式,运用MATLAB软件中Simulink可视化仿真系统对理论计算进行模拟仿真,研究了降低VCSEL激射阈值的3个基本途径;有源层选用量子阱实现微腔结构,腔面采取多层介质反射膜提高光腔反射率R:改进外延生长技术在降低各种损耗。 相似文献
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提出了一种基于随机腔激光的新型平面随机微腔激光器,它由一对多层介质膜反射镜组成的平面微腔和随机腔组成.实验发现,该平面随机微腔激光器可产生单方向性、极底阈值、很窄线宽的激光出射.该结果为随机激光这一概念的应用提供了一种可行的技术路线. 相似文献
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Hamada K. Wada M. Shimizu H. Kume M. Susa F. Shibutani T. Yoshikawa N. Itoh K. Kano G. Teramoto I. 《Quantum Electronics, IEEE Journal of》1985,21(6):623-628
An extremely high output power has been obtained with a new structure laser named the buried twin-ridge substrate (BTRS) laser. The very thin active layer formed on a ridged substrate permitted high power output increasing the catastrophic damage level. The buried stripe formed with a blocking layer remarkably improved the current confinement lowering the threshold current. A multilayer coating technique was applied to both facets to increase the front facet output. Fundamental transverse mode is achieved at more than 100 mW in CW with an uncoated laser while the maximum output power attained is as high as 200 mW in CW operation with a multicoated laser. 相似文献
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G.D. Henshall 《Solid-state electronics》1977,20(7):595-602
Catastrophic degradation in (GaAl)As/GaAs heterostructure lasers is characterised by an irreversible fall in output power together with associated facet damage. The importance of near-field uniformity in interpreting catastrophic degradation is described. The power emission per unit area should primarily determine the onset of catastrophic degradation. It is shown that, when the effect of such factors as the near-field uniformity and internally circulating modes are taken into account, good agreement is obtained between the effective optical width and the limit of catastrophic degradation. This is demonstrated for the five-year LGR structure where it is possible to tailor the far-field pattern width from 50 to 15°, while still retaining low threshold currents. It is now possible to predict the maximum safe operating level of a given laser without destructive measurements. 相似文献
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Wagner D.K. Waters R.G. Tihanyi P.L. Hill D.S. Roza A.J. Jr. Vollmer H.J. Leopold M.M. 《Quantum Electronics, IEEE Journal of》1988,24(7):1258-1265
The operating characteristics of six types of graded-index separate confinement heterostructure single-quantum-well wide-stripe lasers grown by metalorganic chemical vapor deposition are reported. The lasers exhibited intrinsic mode losses as low as 3 cm-1 and internal quantum efficiencies near unity. Measured differential gain coefficients range from 3.7 to 6.5 cm/A, and extrapolated transparency current densities range from 54 to 145 A/cm2. These wide-stripe lasers are typically multilongitudinal mode and exhibit narrowing of the gain envelope and lateral far-field pattern as the cavity length increases. The high value of T 0(>200 K) at long cavity lengths in conjunction with the low current density permits junction-side-up operation to CW optical powers of 0.5-0.7 W/facet, at which level catastrophic facet damage occurs on the uncoated devices. A maximum power conversion efficiency of 57% was measured on the laser structure exhibiting the lowest threshold current 相似文献
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By applying a high-reflectivity metal coating to the rear facet of a GaAs-based quantum cascade laser operating at /spl lambda//spl sim/11.5 /spl mu/m, the threshold current has been reduced by 11% at 260 K and pulsed operation of the epilayer-up mounted device was extended from 283 to 294 K. 相似文献
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大功率半导体激光器腔面抗烧毁技术 总被引:1,自引:0,他引:1
首先介绍了连续激光器单管老化试验,试验通过测试不同老化时间激光器腔面的烧毁功率,对腔面烧毁发生的过程进行了分析。分析认为,大功率半导体激光器腔面烧毁失效的根本原因是腔面烧毁功率在老化过程中持续减小,最终低于激光器输出功率,造成激光器灾变性光学镜面破坏(COMD)。随后对腔面烧毁的微观物理机理进行了介绍,重点讨论了腔面缺陷相关的非辐射复合、量子阱带边吸收、自由载流子吸收造成的腔面温度升高以及腔面高温导致腔面缺陷密度增加并且向腔内攀移的微观过程。最后,介绍了电流非注入腔面、大光腔材料、长腔长设计、腔面离子铣钝化工艺等腔面抗烧毁技术研究情况,并对这些技术提高腔面抗烧毁功率以及改善腔面长期稳定性的效果进行了讨论。 相似文献
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Scifres D.R. Lindstr?m C. Burnham R.D. Streifer W. Paoli T.L. 《Electronics letters》1983,19(5):169-171
A phase-locked multiple-quantum-well (GaAl)As injection laser with a highly reflective rear facet coating and a low reflective front facet coating is reported to emit 2.6 W CW at room temperature from the front facet. 相似文献