Dissertation Defense: Masoud Mollaee, "Thulium Laser and Its Applications"

    Thursday, April 30, 2020 - 10:00am

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    Dissertation Title: Thulium Laser and Its Applications


    The exceptional performance of fiber lasers and their advantages, including robustness, excellent thermal management, compactness, high beam quality, alignment-free, low cost of manufacturing, and maintenance-free have led to extensive applications of fiber lasers in industry, medicine, research, etc. The advancements of fiber lasers have also created a significant demand for fiber integrated devices such as isolators, and circulators.

    This dissertation focuses on thulium-doped fiber lasers at different wavelengths and high Verdet constant magneto-optical glasses for the development of fiber Faraday rotator in the 2 um region.

    Since thulium(3+) has many different emission lines from ultraviolet to mid-infrared, it can be used for different applications. In my dissertation, single-mode, single-frequency Tm-doped ZBLAN fiber amplifiers were developed and investigated for the first time. An output power of 150 mW at 478 nm was obtained. The concept of MOPA based on GaN diode laser oscillator and fiber power amplifier was also demonstrated. An all-fiber laser at 785 nm with an output power of 500 mW was also developed with Tm-doped ZBLAN fiber pumped at 1125 nm. Q-switched Tm-doped fiber laser at 1940 nm was also built and characterized.

    Due to the development of high power fiber lasers in the 2 um region, all-fiber reciprocal devices are in great demand. During my Ph.D. study, the magneto-optical properties of Dysprosium (Dy) doped multicomponent glasses and tellurium-arsenic-selenium glass were measured. World-record Verdet constants of -455 deg/T/m and 870 deg/T/m at 1950 nm were measured with 75 wt.% Dy-doped glass and TASe glass, respectively. This research shows the promise of making Faraday fiber rotators in the 2 um wavelength region.