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F-P Cavity and DFB Yb~(3+)-doped Fiber Laser Research

Author: LiangLiPing
Tutor: LiZhuang;WeiWenLou;FangZuJie
School: Guangxi University
Course: Theoretical Physics
Keywords: Fiber lasers Yb-doped Quasi - four-level F-P cavity Gain spatial hole burning Saturable absorber spatial hole burning Fiber grating Fiber DFB structure Single longitudinal mode
CLC: TN248
Type: Master's thesis
Year: 2001
Downloads: 303
Quote: 3
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Abstract


Yb-doped fiber laser with a broad absorption spectrum, a wide gain band and tuning range, and the upper level and long life, high pumping efficiency, suitable for mature performance LD pumped. Coupled as a fiber laser having a low threshold, high gain, continuous output characteristics, as well as small size, portable, integrated and flexible curved optical waveguide structure and other characteristics, so that the Yb-doped fiber laser having a broad prospects for development of this article first The chapter describes the basic structure and characteristics of the fiber laser. Fiber grating is an important element in the fiber laser devices, the first chapter also details the characteristics and production methods of fiber grating. The second chapter analyzes the fiber grating distributed feedback (distributed-feedback ─ ─ DFB) structure of the fiber laser mode spectrum and threshold characteristics derived for the first time to describe fiber grating the uniform DFB structure and fiber grating phase shift DFB fiber laser threshold formula. The third chapter of the free-running conditions, the characteristics of Yb-doped fiber laser fiber FP cavity. The study showed that the Yb-doped fiber with a wide gain spectrum characteristics, the standing wave cavity structure leads to gain spatial hole burning easily in the Yb-doped fiber laser caused by multi-wavelength oscillation. At the most, can be observed to the three-wavelength laser oscillation adjacent wavelength spacing of 10nm. l When the cavity optical fiber grating for the filter element, the gain spatial hole burning effect will lead to a multi-wavelength oscillation in the reflection within the bandwidth of the fiber grating. In the fourth chapter, Yb-doped fiber FP cavity lasers using fiber grating. Gain spatial hole burning effect to cause the spacing of the multi-wavelength oscillation of about 0.15nm. 55.2 in description Yb-doped fiber saturable absorption effect is derived formula. Theoretical studies show that the smaller the stronger the signal laser saturable absorption coefficient encountered. From the theory for the first time found that the quasi-four level of the saturated absorption coefficient of the medium of the signal laser with temperature, as the temperature increases, the saturable absorption coefficient increases. First experiment qualitatively prove the above conclusions. The above experiments and results are described in 95.2. As a single longitudinal mode laser with important applications in many areas, we Yb-doped fiber single longitudinal mode laser in-depth study. In the standing wave cavity structure and is not pumped Yb-doped optical fiber in the presence of the saturable absorption spatial hole burning effects. This effect is conducive to the compensation gain spatial hole burning, and conducive to single-longitudinal-touch laser output. First, the use of the the FI cavity structure, a length Zm, higher concentrations of Yb-doped fiber, due to the above-described effects obtained smw single longitudinal mode laser output. In the above experiment, the probability of occurrence of a single longitudinal mode is related to the size of the pump power. When the pump power super-threshold moderate, a single longitudinal mode appears most likely. Fiber length can also affect the probability of occurrence of a single longitudinal mode. 193urn excimer laser, using a phase mask directly inscribed in the Yb-doped fiber grating DFB Yb-doped fiber laser. At 97. l, when the pump power in the vicinity of the threshold value when the uniform DFB fiber laser to achieve single longitudinal mode operation. > 2 / \output laser output power of about linW o

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