自發輻射放大量測系統之應用 與雷射光路之串連;The application of the ASE measurement system and interconnection of laser path

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题名:	自發輻射放大量測系統之應用與雷射光路之串連;The application of the ASE measurement system and interconnection of laser path
作者:	周峻弘;JHOU, JYUN-HONG
贡献者:	光電科學與工程學系
关键词:	自發輻射放大;雷射;ASE;laser
日期:	2024-06-26
上传时间:	2024-10-09 15:35:40 (UTC+8)
出版者:	國立中央大學
摘要:	本論文主要是自發輻射放大量測系統的架設和量測，以及沿續學長和同學之研究結果，以波長355 nm的Q-smart 450 Nd:YAG脈衝雷射為起點並使用反射鏡將即時性多角度光譜系統、即時性多角度動量影像量測系統和自發輻射放大系統三者的光路串連起來。自發輻射放大量測系統是以透鏡、柱狀透鏡和可調式狹縫所組成的，高功率的脈衝雷射首先透過電控光學衰減器控制雷射功率大小，再利用帶通濾波片過濾不需要的雜光，並透過無焦透鏡組、柱狀透鏡和可調式狹縫調整光束的大小、形狀和長度，以長度變化法的方式進行樣品的量測，因有機薄膜、空氣和玻璃基板三者折射率大小的不同而形成了如同波導的結構，自發輻射的光子在波導中通過受激輻射而得到增益，最後經由有機材料的側邊斷面出光，再使用光纖接收光譜儀分析。自發輻射放大系統的優點在於能透過量測有機薄膜加上玻璃基板這樣的簡單結構，不需要透過製作共振腔這樣繁瑣的結構，就能夠正確且快速的了解有機材料的雷射特性，這對於有機雷射的材料選擇能夠節省下非常多的時間，且系統組成的光學元件都是可拆卸式的，因此能夠簡單的使用反射鏡將雷射導入即時性多角度光譜系統和即時性多角度動量影像量測系統之中，方便有機雷射的激發進而透過上述兩系統量測其光學上的特性。 ;The main focus of this thesis is the establishment and measurement of the amplified spontaneous emission measurement system, building upon previous research results. It starts with Q-smart 450 Nd:YAG pulsed laser at a wavelength of 355 nm, utilizing reflectors to interconnect the one-snap multi-angle spectroscopy optical system, the one-snap multi-angle momentum imaging system, and the amplified spontaneous emission measurement system. The amplified spontaneous emission measurement system comprises of lenses, cylindrical lens, and an adjustable slit. The high-power pulsed laser is first controlled by a tunable optical attenuator to regulate laser power. Unwanted wavelength of the laser is filtered out using a bandpass filter, and the beam size, shape, and length are adjusted by afocal system, cylindrical lens, and an adjustable slit. Measurement of samples is conducted via the variable stripe length method, utilizing the refractive index differences between organic films, air, and glass substrates, which form a waveguide structure. Photons of spontaneous emission get gain via stimulated emission inside the waveguide, resulting in amplification, and finally emit from the side face of the glass. The emitted light is then analyzed using a spectrometer via optical fiber. The advantage of amplified spontaneous emission measurement system lies in the ability to measure the laser characteristics of organic materials, through the structure of organic films on glass substrates, without building complex structures like resonant cavities. This approach saves considerable time in material selection for organic lasers. Moreover, the optical components of the system are modular. As a result, the laser can be conveniently directed into the one-snap multi-angle spectroscopy optical system and the one-snap multi-angle momentum imaging system, exciting organic lasers and the measuring the optical properties through the above two systems.
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