量子點雷射動態特性及雙能態放光機制分析

Analysis of Dynamic Properties and Two-State Lasing Mechanisms of Quantum-Dot Lasers

王關鑑(Kuan-Chien Wang)

指導教授 ： 毛明華

國立臺灣大學/電機資訊學院/光電工程學研究所/碩士(2005年)

https://doi.org/10.6342/NTU.2005.02166

摘要

在本論文中，我們針對以砷化鎵為基板的量子點雷射在室溫下進行光功率-電流，電激發光以及高速動態這三種量測，並且針對在特定長度下會發生雙能態放光的樣品，於實驗上進行各別的分光動態量測以期和理論上的模擬結果進行比對討論。
在動態特性的量測上，十層量子點雷射樣品發光波長約在1.2微米，共振腔長度在0.9毫米時，我們觀測到最大的鬆弛振盪頻率可達7.9 GHz，此為本實驗室截至目前為止觀測到最快速的量子點雷射。
五層量子點雷射樣品，長度為3毫米時，發光波長在1.3微米，最大鬆弛振盪頻率為1.5 GHz，相當於調變頻寬可達2.3 GHz。長度為1.5毫米時，發光波長在1.22微米，最大振盪頻率為3 GHz，相當於調變頻寬可達4.6 GHz。
在雙能態放光部分，目前理論以及實驗上都有相當多的論文發表結果[1][2]，然而就我們所知，截至目前為止尚未出現對雙能態放光雷射樣品各別動態行為的實驗量測結果，我們於實驗上首次成功的觀測到雙能態放光的動態行為，發現激發態放光的動態行為反應速度較基態迅速，與理論模擬的結果吻合。

關鍵字

雷射 ； 量子點 ； 雙能態放光

並列摘要

In this paper, we measured the L-I, EL and time-resolved dynamic properties of quantum-dot lasers based on GaAs substrate. Moreover, we measured the dynamic properties of two-state lasing QD laser at specific wavelength.
In dynamic measurement, ten-layer quantum dot sample is lasing at 1.2 μm while the cavity length is 0.9 mm. And the RO frequency is 7.9 GHz which is the highest RO frequency we have observed in our lab up to now.
Five-layer quantum dot laser is lasing at 1.3 μm while the cavity length is 3 mm and the RO frequency is 1.5 GHz. When the cavity length is shorten to 1.5 mm, the emitting wavelength is switched to 1.22 μm and the RO frequency is 3.0 GHz.
Recently, experimentally observations of simultaneous lasing in steady state from ground states (GS) and excited states (ES) in QD lasers has been reported. However, to our knowledge, there is no experimentally investigation about the transient of GS and ES ,respectively, from two-state lasing QD lasers up to now. In this work, spectrally-resolved dynamics of two-state lasing in QD lasers is experimentally demonstrated for the first time. The onset of excited-state lasing prior to ground-state lasing is consistent with our theoretical prediction.

並列關鍵字

laser ； quantum dot ； two-state lasing

參考文獻

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[12] L. A. Coldren, and S. W. Corzine, Diode Lasers and PhotonicIntegrated Circuits, Wiley, (1995)

[15] S. Fathpour, Z, Mi and P. Bhattacharya, Appl. Phys. Lett. 38, pp.2103-2111, (2005)