The Experts below are selected from a list of 36282 Experts worldwide ranked by ideXlab platform
Juan Liu - One of the best experts on this subject based on the ideXlab platform.
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Extraordinary variation of Pump Light intensity inside a four-level solid-state laser medium
Optics and Lasers in Engineering, 2008Co-Authors: Hua Qin, Zhaoqi Wang, Juan LiuAbstract:A theoretical investigation of the absorption of the Pump Light at different intensities through a four-level solid-state laser medium is presented. It is found that the variation of the Pump intensity inside the laser medium cannot always simply be dominated by Beer's law. Transmission of the Pump Light through this laser medium is closely related to the Pump intensity itself. In fact, when the Pump intensity is relatively low, whose values depend on the characteristics of the medium, the variation of the Pump Light through the laser medium is consistent with Beer's law. However, while the Pump intensity is high enough, the relationship between the transmission of the Pump Light and its propagation distance is demonstrated to be linear. These theoretical results have been confirmed by the experiment with a medium of YAG:Nd.
Hua Qin - One of the best experts on this subject based on the ideXlab platform.
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Extraordinary variation of Pump Light intensity inside a four-level solid-state laser medium
Optics and Lasers in Engineering, 2008Co-Authors: Hua Qin, Zhaoqi Wang, Juan LiuAbstract:A theoretical investigation of the absorption of the Pump Light at different intensities through a four-level solid-state laser medium is presented. It is found that the variation of the Pump intensity inside the laser medium cannot always simply be dominated by Beer's law. Transmission of the Pump Light through this laser medium is closely related to the Pump intensity itself. In fact, when the Pump intensity is relatively low, whose values depend on the characteristics of the medium, the variation of the Pump Light through the laser medium is consistent with Beer's law. However, while the Pump intensity is high enough, the relationship between the transmission of the Pump Light and its propagation distance is demonstrated to be linear. These theoretical results have been confirmed by the experiment with a medium of YAG:Nd.
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Absorption of Pump Light inside solid-state laser medium Pumped by long pulse
High-Power Lasers and Applications IV, 2007Co-Authors: Hua Qin, Weijun Sun, Zhaoqi WangAbstract:The theoretical solution to the absorbed Pump Light inside a laser medium is presented. It is shown that the Pump Light absorbed with respect to the transport distance is not simply an exponential function. When the Pump intensities go high enough, their relation becomes a nonexponential function. These theoretical results have been applied to YAG:Nd, and the regularity of Pump Light intensity variation inside a laser medium is indicated. We experimented with YAG:Nd, and the experimental result is in agreement with the theoretical result.
Ken-ichi Ueda - One of the best experts on this subject based on the ideXlab platform.
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cascade conical refraction for annular Pumping of a vortex nd yag laser and selective excitation of low and high order laguerre gaussian modes
Laser Physics Letters, 2018Co-Authors: Zhongyang Wang, Sanbin Chen, Akira Shirakwa, Ken-ichi UedaAbstract:We proposed an efficient and vortex Nd:YAG laser for selective lasing of low- and high-order vortex modes, in which multiple-ring Pump Light was originated from cascaded conical refraction of multiple biaxial crystals. In our proof of concept demonstration, we used two-crystal cascade conical refraction to generate two-ring Pump Light; the mutual intensity ratio and relative separation of the inner ring and outer ring were controlled by rotating the second biaxial crystal and by moving the imaging lens, respectively. As a result, we obtained selective excitation of Laguerre–Gaussian (LG01 and LG03) vortex modes in the end-Pump Nd:YAG laser. For LG01-mode output, the laser power reached 439 mW with 52.5% slope efficiency; for LG03-mode output, the laser power reached 160 mW with 41.3% slope efficiency. Our results revealed that the multiple-ring Pumping technique based on cascaded conical refraction would pave the way for realization of the efficient and switchable excitation of low- and high-order LG modes in an end-Pumped solid-state laser.
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Residual Pump Light as a probe of self-pulsing instability in an ytterbium-doped fiber laser.
Optics letters, 2006Co-Authors: Ken-ichi Ueda, Mitsuru Musha, Akira ShirakawaAbstract:Self-pulsing instability in the ytterbium-doped fiber (YDF) laser is investigated with the Pump-bypassed cavity configuration. The residual Pump Light acts as a probe of the intracavity dynamics, and the temporal behavior of the Light shows correlations with the self-mode locking instability in the original cavity and the sustained self-pulsing instability in the modified cavity of the YDF laser. The results suggest that the interactions among stimulated emission, Pump absorption and/or reabsorption could account for self-pulsing instability in the YDF laser. The Pump-bypassed laser cavity configuration can be used to investigate the instabilities of various kinds of fiber lasers.
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Control of the thermal lensing effect with different Pump Light distributions
Applied optics, 1997Co-Authors: Jie Song, Anping Liu, Kazunori Okino, Ken-ichi UedaAbstract:We built a 32-laser-diode-formed virtual point source Pumping system and achieved different Pump Light distributions from central intense to central uniform and central depressed. Continuous wave TEM(00) operations of a Nd:YAG laser were performed under these Pump Light distributions and their thermal lensing effects were estimated. Results show that the operation under central depressed Pump Light distribution has the lowest thermal lensing effect and can provide the highest output power, which agrees with the results derived from the theoretical calculation with the heat conduction equation.
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Propagation losses of Pump Light in rectangular double‐clad fibers
Optical Engineering, 1996Co-Authors: Ken-ichi UedaAbstract:The propagation losses of Pump Light in rectangular double- clad fibers are investigated both experimentally and theoretically. The dependence of propagation losses on the incidence of Pump Light as well as fiber lengths are measured using a simple method. It is found that for the same material compositions, the effective numerical apertures (NAs) of rectangular fibers is less than those of circular fibers and the Pump Light propagation loss in rectangular fibers is larger. The difference of propagation losses between both fibers is rationalized with a geometrical optics analysis. © 1996 Society of Photo-Optical Instrumentation Engineers.
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Propagation losses of Pump Light in rectangular double-clad fibers
Optical Engineering, 1996Co-Authors: Anping Liu, Ken-ichi UedaAbstract:The propagation losses of Pump Light in rectangular double- clad fibers are investigated both experimentally and theoretically. The dependence of propagation losses on the incidence of Pump Light as well as fiber lengths are measured using a simple method. It is found that for the same material compositions, the effective numerical apertures (NAs) of rectangular fibers is less than those of circular fibers and the Pump Light propagation loss in rectangular fibers is larger. The difference of propagation losses between both fibers is rationalized with a geometrical optics analysis. © 1996 Society of Photo-Optical Instrumentation Engineers.
A. L. Wilson - One of the best experts on this subject based on the ideXlab platform.
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Energy-scavenging amplifiers for miniature solid-state lasers.
Optics letters, 2004Co-Authors: John J. Zayhowski, A. L. WilsonAbstract:Longitudinally Pumped miniature lasers are inefficient, partly because of their inefficient absorption of the Pump Light. Scavenging the unabsorbed Pump Light to Pump an in-line amplifier can greatly enhance the efficiency of the system, with minimal added cost, size, or complexity.
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Energy-scavenging amplifiers for miniature solid-state lasers
2004Co-Authors: John J. Zayhowski, A. L. WilsonAbstract:Longitudinally Pumped miniature lasers are inefficient, partly because of inefficient absorption of the Pump Light. By scavenging the unabsorbed Pump Light to Pump an in-line amplifier, the efficiency of the system can be greatly enhanced.
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Pump induced bleaching of the saturable absorber in short pulse nd yag cr sup 4 yag passively q switched microchip lasers
IEEE Journal of Quantum Electronics, 2003Co-Authors: J J Zayhowski, A. L. WilsonAbstract:Bleaching of the saturable absorber by Pump Light increases the length of the pulse generated in a passively Q-switched Nd:YAG/Cr/sup 4+/:YAG microchip laser and decreases the pulse energy. This effect is greatest when transmitted Pump Light is nearly focused in the Cr/sup 4+/:YAG and when Pumping is sufficiently intense to bleach the absorption of the Nd:YAG. Both effects are important in short-pulse microchip lasers. The maximum repetition rate of a passively Q-switched Nd:YAG/Cr/sup 4+/:YAG microchip laser is correlated with the pulsewidth. In general, it decreases as the pulsewidth gets shorter.
Zhaoqi Wang - One of the best experts on this subject based on the ideXlab platform.
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Extraordinary variation of Pump Light intensity inside a four-level solid-state laser medium
Optics and Lasers in Engineering, 2008Co-Authors: Hua Qin, Zhaoqi Wang, Juan LiuAbstract:A theoretical investigation of the absorption of the Pump Light at different intensities through a four-level solid-state laser medium is presented. It is found that the variation of the Pump intensity inside the laser medium cannot always simply be dominated by Beer's law. Transmission of the Pump Light through this laser medium is closely related to the Pump intensity itself. In fact, when the Pump intensity is relatively low, whose values depend on the characteristics of the medium, the variation of the Pump Light through the laser medium is consistent with Beer's law. However, while the Pump intensity is high enough, the relationship between the transmission of the Pump Light and its propagation distance is demonstrated to be linear. These theoretical results have been confirmed by the experiment with a medium of YAG:Nd.
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Absorption of Pump Light inside solid-state laser medium Pumped by long pulse
High-Power Lasers and Applications IV, 2007Co-Authors: Hua Qin, Weijun Sun, Zhaoqi WangAbstract:The theoretical solution to the absorbed Pump Light inside a laser medium is presented. It is shown that the Pump Light absorbed with respect to the transport distance is not simply an exponential function. When the Pump intensities go high enough, their relation becomes a nonexponential function. These theoretical results have been applied to YAG:Nd, and the regularity of Pump Light intensity variation inside a laser medium is indicated. We experimented with YAG:Nd, and the experimental result is in agreement with the theoretical result.
