跳到主要內容

臺灣博碩士論文加值系統

(3.95.131.146) 您好!臺灣時間:2021/07/29 02:43
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果 :::

詳目顯示

我願授權國圖
: 
twitterline
研究生:戴世芃
研究生(外文):Ship Peng Tai
論文名稱:鉻貴橄欖石鎖模雷射及其應用在高速通訊元件上的量測
論文名稱(外文):Femtosecond Cr4+:forsterite laser and its application in high-speed telecommunication device measurement
指導教授:孫啟光孫啟光引用關係
指導教授(外文):Chi Kuang Sun
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:光電工程學研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2000
畢業學年度:88
語文別:英文
論文頁數:100
中文關鍵詞:鉻貴橄欖石腔內二倍頻低溫'成長砷化鎵高速光偵測器電子取樣系統電光取樣系統
外文關鍵詞:Cr:forsteriteIntracavity frequency doublingLT-GaAsHigh-speed photodetectorElectrical samplingElectro-optic sampling
相關次數:
  • 被引用被引用:0
  • 點閱點閱:142
  • 評分評分:
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
在本論文中,我們報告了建造一台鉻貴橄欖石飛秒雷射的過程。在這台雷射之中我們使用了一個半導體鎖模鏡去引發及穩定飛秒脈衝的產生。在6.3瓦特的激發功率下,此雷射的輸出功率為330毫瓦,脈衝寬度為130飛秒,中心波長是在1230奈米。由於其放光波長在通訊波長而且可以產生非常短的脈衝,因此鉻貴橄欖石雷射可以用來量測高速的通訊元件。此外,當我們逐漸減少腔內負色散的量,我們觀察到光孤子的現象,因此這台雷射中的鎖模機制不光是柯爾透鏡鎖模還包括了光孤子鎖模。
我們藉由在鉻貴橄欖石雷射共振腔內放入BBO晶體,建造了第一台直接由雷射共振腔發出紅光的飛秒脈衝全固態雷射。不同於鎖模的染料雷射,全固態雷射具有體積較小、容易操作、穩定以及長的操作壽命,'因此紅光的飛秒脈衝全固態雷射可以用來取代鎖模的染料雷射。
另外我們用鉻貴橄欖石飛秒脈衝雷射當作激發光源配合電子取樣的技術去量測高速通訊元件在高功率的激發和不同偏壓下的行為。在這個量測中我們量測了兩種不同結構(p-i-n,n-i-n)的的行波式光偵測器,其吸收層是採用低溫成長的砷化鎵製成。當激發光功率超過4毫瓦時,我們在p-i-n元件中觀察到頻寬飽和的現象。這是因為元件中載子飽和、空間電荷屏敝效應以及外部電路飽和共同作用的結果。在n-i-n元件的量測中,由於高電場造成的電子穿遂效應我們觀察到在高偏壓時元件的脈衝響應會變寬和量子效率變得特別好。在這個量測中我們量到的最短脈衝響應為18皮秒,而這是儀器本身的解析度的極限。
由於電子取樣系統的時間解析度不夠高,因此我們計劃建造一個電光取樣系統。這個系統的時間解析度可以達到次皮秒以幫助我們能更深入了解由低溫成長的砷化鎵製成的光偵測器的行為。關於此系統的原理以及實體架設都在論文中有描述。我們並使用了一個簡單的方法去測試此系統的訊號雜訊比,結果顯示,更進一步去減少系統的雜訊是必須的。

In this thesis, we report the construction a femtosecond chromium-doped forsterite laser. A semiconductor saturable absorber mirror (SESAM) is used to initiate and stabilize femtosecond pulse generation. The typical output power is 330 mW at 1230 nm with 130-fs pulse width under 6.3 W pump power. Due to the emission wavelength at telecommunication wavelength and ultrashort pulsewidth, the femtosecond Cr4+:forsterite laser can be used to study high speed telecommunication devices. Soliton behavior is observed in this laser with decreased intracavity negative dispersion so that the Cr4+:forsterite laser are not only Kerr lens mode-locked but also soliton mode-locked.
By placing a 1-mm BBO in the Cr4+:forsterite laser cavity, we construct the first all-solid-state red (near 600 nm) laser direct from laser oscillator. Unlike colliding pulse mode-locking (CPM) dye lasers, all-solid-state lasers are compact, stable with easy operation and have long life time. This all-solid-state femtosecond red laser is a good replacement of CPM dye lasers.
We use the high power femtosecond Cr4+:forsterite laser as a pumping source with an electrical sampling method to study the behaviors of traveling wave photodetectors under high power excitation with different bias voltages at telecommunication wavelength. Two structures (p-i-n and n-i-n) of LT-GaAs traveling wave photodetector are measured. In the p-i-n devices, the saturation behavior is observed while the optical pumping power is above 4 mW at low bias voltage. The saturation is contributed from carrier saturation, space charge screening effect and external circuit saturation. Due to the electron tunneling effect, the impulse response broadening with excellent quantum efficiency is observed in n-i-n devices at high bias voltage. An instrument limited impulse response (18ps) was obtained in this measurement.
Because the time resolution of the electrical sampling is too low to resolve the detailed carrier transport behaviors, we propose to construct an Electro-Optical sampling system. The time resolution of the system is up to subpicosecond which is enough to understand more detail behaviors in high-speed LT-GaAs photodetectors. The principle and embodiment are described in the thesis and a simple method is used to test signal to noise ratio of this system. The result shows that to reduce the system noise is needed.

1 Introduction
Reference
2 Femtosecond Cr4+:Forsterite Laser with a Semiconductor Saturable Absorber Mirror
2.1 Mode-locking
2.2 Pulse shaping mechanisms
2.2.1 Self phase modulation
2.2.2 Group velocity dispersion
2.2.3 Gain dispersion
2.2.4 Saturable loss from a slow saturable absorber
2.3 The master equation of soliton mode-locking with a slow saturable absorber
2.4 Structure and performance of our femtosecond Cr4+:forsterite laser
2.4.1 Dispersion compensation
2.4.2 Astigmatic compensation
2.4.3 Semiconductor saturable absorber mirror
2.4.4 Femtosecond Cr4+: forsterite laser system
2.4.5 Performance of our femtosecond Cr4+:forsterite Laser
2.5 Reference
3 Intracavity Frequency Doubled Femtosecond Cr4+:Forsterite Laser
3.1 Motivation
3.2 Experiment setup
3.3 Results and discussion
3.4 Reference
4 Electrical Sampling Measurement of High-Speed Photodetectors for Telecommunication
4.1 Introduction
4.2 Device structure
4.3 Experiments and discussion
4.3.1 D.C. measurement
4.3.2 Electrical sampling measurement
4.3.2.1 The electrical sampling on the p-i-n LT-GaAs photodetector
4.3.2.2 The electrical sampling on the n-i-n LT-GaAs photodetector
4.4 Reference
5 Future Work: Electro-Optical Sampling System
5.1 Introduction
5.2 Electro-optic voltage probing in a ZnTe crystal
5.3 System description
5.4 Results and system improvement
5.5 Reference
6 Summary

1.1 V. Petri?evi?, S. K. Gayen, and R. R. Alfano, "Laser action in chromium-activated forsterite for near-infared excitation: Is Cr4+ the lasing ion?" Appl. Phys. Lett., vol. 52, pp. 2590-2592 (1988).
1.2 Horacio R. Verdun, Leonard M. Thomas, Donna M. Andrauskas, Tom McCollum, and Albert Pinto, "Chromium-doped forsterite laser pumped with 1.06 mm radiation." Appl. Phys. Lett., vol. 53, pp. 2593-2595 (1988).
1.3 C. Chudoba, J. G. Fujimoto, E.P. Ippen, H.A. Haus, U. Morgner, F. X. Kartner, V. Scheurer, G. Angelow, and T. Tschudi., " All-solid-state Cr:forsterite laser generating 14-fs pulses at 1.3μm" CLEO Postdeadline paper, CPD4 (2000).
1.4 Zhigang Zhang, Kenji Torizuka, Taro Itatani, Katsuyuki Kobayashi, Takeyoshi Sugawa, and Tadashi Nakagawa, "Self-starting mode-locked femtosecond forsterite laser with a semiconductor saturable-absorber mirror." Opt. Lett., vol. 22, pp. 1006-1008 (1997).
1.5 Zhigang Zhang, Kenji Torizuka, Taro Itatani, Katsuyuki Kobayashi, Takeyoshi Sugawa, and Tadashi Nakagawa, "Femtosecond Cr:forsterite laser with mode-locking initiated by a quantum-well saturable absorber." IEEE J. Quantum Electron., vol. 33, pp. 1975-1981 (1997).
1.6 E. V. Dianov, V. I. Karpov, M. V. Grekov, A. M. Prokhorov, V. F. Kamalov, and E. V. Slobodchikov, ?.3 mm Raman fiber amplifier pumped by Cr:forsterite laser." Electron. Lett., vol. 32, pp. 1481-1483 (1996).
1.7 B. Golubovic, B. E. Bouma, I. P. Bilinsky, J. G. Fujimoto, and V. P. Mikhailov, "Self-phase modulated Kerr-lens mode-locked Cr:forsterite laser source for optical coherent tomography." Opt. Lett., vol. 21, pp. 1839-1841 (1996).
1.8 R. Rox Anderson and John A. Parrish, "The Optics of Human Skin." J. Investigative Dermatology, vol. 77, pp. 13-18 (1981).
1.9 Liejia Qian, Xiang Liu, Frank Wise, "Cr:forsterite laser pumped by broad-area laser diodes." Opt. Lett., vol. 22, pp. 1707-1709 (1997).
1.10 Y. P. Tong, P. M. W. French, J. R. Taylor, "All-solid-state femtosecond sources in the near infarred." Optics Communications, vol. 136, pp. 235-238 (1997).

QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top