| dc.description.abstract | 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. | en_US |