buildup tim e(us)
E: 飽和吸收鏡之研究 : 以雙波耦合法量測飽和吸收鏡之特性 , 並以此 類飽和吸收體與 KLM 相結合達到可條波長範圍 100nm 的飛秒雷射
輸出 (780nm 到 880nm).
15.用雙波耦合（two-beam coupling）法研究鎖模用飽和吸收鏡特性（碩士生李 國庭）
半導體飽和吸收反射鏡 (saturable Bragg reflector ,SBR) 在我們設計的飛 秒級被動鎖模 Ti:sapphire 雷射建立的初期扮演了相當重要的角色。在這項工作 中，我們希望能應用 two beam coupling technique(TBC)高敏感度與良好訊噪比的 優點來觀察與模擬 laser pulse 在經過 SBR 後，其相位與波形所產生的變化。期 能從實驗中瞭解 SBR 在 cavity equation 裡所扮演的角色，並更加清楚的認知 SBR 的工作原理與設計方向。圖 15-1 即實驗裝置：
以樣品 K242 為例 ,結構為 17 層 DBR 上之單層量子井吸收層，吸收中心波 長為 810nm，提供高反射率頻譜範圍為 795nm~850nm，飽和能量密度(saturation fluence)為 131.42µJ/cm
2
。調整入射光的功率，可觀察 SBR 在不同能量密度 (lowfluence, near saturation fluence, high fluence)照射下，對脈衝波形與相位上的 影響。圖 15-2 及 15-3 分別是在入射光脈衝為 highly positively chirped 與 transform-limited 的情況下，所獲得的 TBC 實驗結果。由直觀上的判斷可發現雷射光源在經過 SBR 後的確在相位上產生變化。當 能量密度越高，SBR 所表現的就如同一面反射鏡。隨著能量密度降低，SBR 對 laser pulse 的影響越為明顯。除了相位外，我們推測在雷射波形在低能量的密度 下，因量子井參與吸收而訊號有所變化。此外，transform-limited 條件下的訊號 變化較 highly positively chired 條件下為大。這可以解釋為 SBR 本身所導致的 chirp parameter 的變化並不大，故在 highly positively chirped 條件所造成的影響有限，
反之亦然。
16.利用 SBR 的共振被動鎖模雷射之研究（碩士生陳哲聰）
這項工作的目的是結合 KLM 鎖模雷射與具腔內飽和吸收體（如 SBR）的被 動鎖模雷射的優點，使雷射可以輸出超短脈衝，波長可調諧，同時可以自起動
（self-starting）。雷射的結構如圖 16-1 所示：
圖 16-1
此雷射在 KLM 模式下工作時，輸出脈衝寬最短約 73 飛秒，頻譜寬約 15 奈米。
且波長由 780-880 奈米都可以鎖模脈衝輸出（請參考圖 16-2）。
圖 16-2
三．研究成果：
自 7/1/2000 迄今發表於國際性學術期刊之論文計 2 篇，審稿或投稿中之期 刊論文 74 篇，國際會議論文計 13 篇，其中 1 篇為邀請演講。國內會議發表論文 計 2 篇。黃銘杰在國科會（Project report 1）獲大專學生研究創作獎。邢瀠心等 在 中華民國光學工程學會（碩士論文 1）獲最佳學生論文獎－碩士組。上述期刊 與會議論文列表如下：
Part A. Refereed Journal Papers:
1. Zhenlin Liu, Shingo Ono, Hideyuki Ohtake, Nobuhiko Sarukura, Tze-An Liu, Kai-Fung Huang and Ci-Ling Pan, "Efficient terahertz radiation generation from a bulk InAs mirror as an intracavity terahertz radiation emitter," Jpn. J.
Appl. Phys., Vol. 39, pt. 2, No. 4B, pp. L366-L367, Apr 15 2000.
2. Gong-Ru Lin and Ci-Ling Pan, “Characterization of Optically-Excited Terahertz Radiation from Arsenic-ion-implanted GaAs,” Appl. Phys. B, Vol. 72, No. 2, pp.
151 - 155, February 2001.
3. Gong-Ru Lin, Tze-An Liu, and Ci-Ling Pan, “Correlation between Defect Concentration and Carrier Lifetime of GaAs Grown by Molecular Beam Epitaxy
at Different Temperatures,” submitted to Jpn. J. Appl. Phys., under revision, Sept.
2000.
4. Tze-An Liu, Kai-Feng Huang, Ci-Ling Pan, Shingo Ono
2
, Hideyuki Ohtake2
, And Nobuhiko Sarukura, “Generation of THz-radiation from resonant absorption in Strained Multiple-Quantum-Well in a magnetic field,” accepted to publication on Jpn. J. Appl. Phys., july., 2001.5. Jia-Min Shieh, Shang-Cheng Liu, and Ci-Ling Pan, “Theoretical and experimental studies of the pulse forming dynamics of cw passively mode-locked Ti:sapphire lasers with intracavity saturable absorbers - Part I:
Experimental Studies, submitted to IEEE J. Quantum Electron..
6. Jia-Min Shieh, Shang-Cheng Liu, and Ci-Ling Pan, “Theoretical and experimental studies of the pulse forming dynamics of cw passively mode-locked Ti:sapphire lasers with intracavity saturable absorbers - Part II:
Theoretical Studies, submitted to IEEE J. Quantum Electron..
7. Jia-Min Shieh, Liang-Iao Chang, S. C. Wang and Ci-Ling Pan, "Simultaneous time-domain detection and suppression of laser timing jitter," submitted to Optics Lett.
8. Ci-Ling Pan, C. C. Yu, L. Hsu, and S. C. Wang, " Design and operation of a tunable cw triple-wavelength external-cavity diode laser," submitted to Jpn. J.
Appl. Phys.
9. C. -K. Lee, F. J. Kao, S. C. Wang, and Ci-Ling Pan, "Confocal Micro-Spectroscopic Observation of Second Harmonic Emission and Three-Photon-Excited Photoluminescence from Gallium Nitride,: submitted for publication, Opt. Lett., April 2001.
Part B. International Conference Papers（7/1/200 - present:
1. Ci-Ling Pan（潘犀靈）, “Tunable Dual-Wavelength Semiconductor Lasers:
Applications to CW THz Generation,” invited lecture, presented at the NCTS Topical Schools: Theory & Advance Measurement on Novel Semiconductor System (part II), July 17-18, 2000, National Tsing Hua University, Hsinchu, Taiwan.
2. Ci-Ling Pan, Tze-An Liu, Gong-Ru Lin, and Masahiko Tani, “Multi-energy arsenic-ion-implanted GaAs photoconductors for ultrafast switching and THz Generation,” in 2000 IEEE/LEOS Annual Meeting Conference Proceedings, 13-16, November 2000, The Westin Rio Mar Beach, Puerto Rico, paper TuE 4, pp. 179-180.
3. Tze-An Liu, Masahiko. Tani, Gong–Ru Lin and Ci-Ling Pan, “THz Emission Characteristics of Photoconductive Antennas with Different Gap Size Fabricated on Arsenic-Ion-Implanted GaAs”, National Chiao Tung University, Hsinchu, Taiwan, ROC, paper W-S2-A001, 2
nd
International Photonics Conference, Dec 11-15,2000 (IPC2000)4. Zhenlin Liu, Yuji Suzuki, Shingo Ono, Hideyuki Ohtake, Nobuhiko Sarukura, Tze-An Liu, Kai-Fung Huang and Ci-Ling Pan, “Efficient THz radiation generation from a bulk InAs mirror as an intracavity emitter”, W-S2-A003, International Photonics Conference, Dec 11-15,2000 (IPC2000)
5. Gong–Ru Lin, Y. –C. Chang, Tze-An Liu and Ci-Ling Pan, “A Novel Delay-Time-Tunable Passively mode-locked Ti:Sapphire Laser”, Th-S2-E005,
International Photonics Conference, Dec 11-15,2000 (IPC2000)
6. Tze-An LIU, K. F. HUANG, Shingo ONO, Hideyuki OHTAKE, and Nobuhiko
SARUKURA, Ci-Ling PAN“Generation of THz-radiation from exciton in strained-multiple-quantum-wells under the magnetic field” CTuA, Conference on lasers and Electro-Optics, CLEO’2001, May 6-11, 2001
7. Y. S. Hsing, J. M. Hsieh, and Ci-Ling Pan, “Time-gated FROG: A new technique for studying the buildup of optical pulse field in mode-locked ultrafast lasers,”
The 12th International Conference on Ultrafast Phenomena, July 9 –13, 2000, Charleston, South Carolina, paper MF38, pp. 203 – 205.
8. Ci-Ling Pan, Ru-Pin Pan, Wen-Li Lu, and Chia-Reng Sheu, "Electronically Tunable Multiple Wavelength Semiconductor Laser by Using a Liquid Crystal Pixel Mirror" presented at the 18th International Liquid Crystal Conference., Sendai International Center, Sendai, Japan, July 24 – 28, 2000, paper 25D-24-P, p/ 297.
9. Chao-Kuei Lee, Fu-Jen Kao, S. C. Wang, Ci-Ling Pan,“Observation of second harmonic emission and three-photon fluorescence from Gallium-Nitride", Proceedings of International Workshop On Nitride, Nagoya, Japan, Sept. 25 – 27, 2000, p.336.
10. Chao-Kuei Lee, Fu-Jen Kao, S. C. Wang, Ci-Ling Pan,“Concurrent generation of high-order optical nonlinear optical emission from GaN film” , Conference Digest of OSA Annual Meeting and Exhibit 2000 and ILS-XVI: 16th Interdisciplinary Laser Science Conference, Providence, Rhode Island, Oct. 22- 26, 2000, p.113.
11. Ru-Pin Pan, Wen-Li Lu, Chia-Rong Sheu, and Ci-Ling Pan, “Electronically Tunable Single- and Multiple- Wavelength Broad-Area Semiconductor Laser,” in 2000 IEEE/LEOS Annual Meeting Conference Proceedings, 13-16, November 2000, The Westin Rio Mar Beach, Puerto Rico, paper ThP 6, pp. 830-831.
12. Chao-Kuei Lee, Fu-Jen Kao, S. C. Wang, and Ci-Ling Pan, “Nonlinear optical property of Gallium-Nitride film,” ibid., paper Th-S3-E004.
13. Gong-Ru Lin, Jui-Lin Chang, Wei-Kuo Chen, and Ci-Ling Pan, “Transmission line measurements of nearly semi-insulating GaN diode with Au contacts,” ibid., paper Th-S1-P001.
Part B. Local Conferences:
1. Hsiu-Chi Tung (董修琦), Ming-Chieh Huang (黃銘杰), Wen-Li Lu (呂文禮), Ru-Pin Pan (趙如蘋), C. L. Pan (潘犀靈), “Progress in Tunable External-Cavity Semiconductor Laser Using Liquid Crystal Pixel Mirror,” 2000 國際華人液晶研 討會,18-19 December 2000, 台南成功大學, p. 102.
2. Tze-An LIU （劉子安）, K. F. HUANG （黃凱風）, Shingo ONO, Hideyuki OHTAKE, and Nobuhiko SARUKURA, Ci-Ling PAN（潘犀靈）, “Generation of THz-radiation from resonant absorption in Strained Multiple-Quantum-Well in a magnetic field” Poster paper, PE31, Feb 12~Feb 14, 2001. 2001年中華民國物理 學會年會
Part C 碩士論文
1. 邢瀠心，”Time-gated FROG: A new technique for studying the buildup of optical pulse field in ultrafast mode-locked Ti: sapphire laser 時間閘－FROG：研究鎖模 超快雷射光脈衝場起動之新技術,” M. S. Thesis, National Chiao Tung
University, Hsinchu, Taiwan, June 2000.
Part D Project report
1. Ming Ja Huang（黃銘杰）, “Novel electronically wavelength-tunable
external-cavity laser diode, 新型電控波長可調外腔式半導體雷射”, Project report, National Science Council Undergraduate Research Project, 2000.