The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
Yung-fu Chen - One of the best experts on this subject based on the ideXlab platform.
-
Exploring the power scaling of the cryogenic 946 nm monolithic laser
Laser Physics Letters, 2018Co-Authors: T. L. Huang, Hao-ping Cheng, Kai-feng Huang, Yung-fu ChenAbstract:The criterion for achieving power scaling of the cryogenically cooled monolithic 946 nm laser is investigated by varying crystal length. Theoretical analysis of the mode-to-Pump Size matching indicates that the optimal power can be obtained with a crystal length of 8 mm. Furthermore, the Pump–wavelength dependence of the output power can be less sensitive when a longer crystal was employed. We demonstrate 946 nm monolithic lasers with various crystal lengths to verify the theoretical analysis. The highest output power (30.2 W) is obtained by using an 8 mm Nd:YAG crystal at 130 K. Moreover, the output power reduction ratio is found to be smaller than 15% with the Pump wavelength fluctuating between ±1 nm.
-
Exploring the Emergence of the Self-Q-Switching in Diode-Pumped Yb:KGW Monolithic Lasers
IEEE Journal of Selected Topics in Quantum Electronics, 2018Co-Authors: Tzu-lin Huang, Hsin-chih Liang, Kuan-wei Su, Yung-fu ChenAbstract:We perform through experiments to explore the key factors for the emergence of a self-Q-switching phenomenon in diode-Pumped Yb:KGW lasers. In addition to the output transmission, it is found that the mode-to-Pump Size ratio is a critical factor leading to the self-Q-switching. The region of the cavity mode volume without overlapping the Pump volume plays a role of modulation loss to result in self-Q-switching. With an output transmission of 4% and a mode-to-Pump Size ratio of approximately 1.2, simultaneous self-Q-switching and self-mode-locking with the repetition rate of 23.1 GHz were experimentally observed. At an incident Pump power of 9.2 W, the maximum pulse energy was estimated to be 1.4 μJ at the repetition rate of 880 kHz with an average output of 1.27 W.
-
Generation of Self-Q-Switching in a Diode-Pumped Monolithic Yb:KGW Laser
Laser Congress 2018 (ASSL), 2018Co-Authors: Tzu-lin Huang, Kai-feng Huang, Hsing Chih Liang, Yung-fu ChenAbstract:Mode-to-Pump Size ratio of the laser system was experimentally found to be the key factor leading to self-Q-switching. The maximum pulse energy was estimated to be 1.4 μJ at the repetition rate of 880 kHz.
-
Modeling of diode-end-Pumped Q-switched solid-state lasers: influence of energy-transfer upconversion
Journal of the Optical Society of America B, 2002Co-Authors: Yung-fu Chen, Yu-pin Lan, Shing Chung WangAbstract:The influence of energy-transfer upconversion (ETU) on diode-end-Pumped actively Q-switched lasers is investigated by the space-dependent rate equation analysis. The numerical analysis reveals that as a consequence of the ETU effect there is an optimum Pump Size for yielding the largest pulse energy and a different optimum Pump for yielding the highest peak power at a given Pump power. The practical example of the diode-Pumped actively Q-switched Nd:YAG laser has been used to verify the present model.
-
Influence of energy-transfer upconversion on the performance of high-power diode-end-Pumped CW lasers
IEEE Journal of Quantum Electronics, 2000Co-Authors: Yung-fu Chen, Yu-pin Lan, Shing Chung WangAbstract:The influence of energy-transfer upconversion (ETU) on the performance of diode-end-Pumped lasers is studied by including ETU effects into the space-dependent rate equations. The dependence of ETU rates on the mode-to-Pump Size ratio and on the output mirror transmission is derived. Experiments for Nd:YAG and Nd:YVO/sub 4/ crystals are performed to validate the present model. It is found that the ETU process increases the sensitivity of the output power to the output mirror transmission but its influence on the output power is not significant for low output transmission.
Shing Chung Wang - One of the best experts on this subject based on the ideXlab platform.
-
Modeling of diode-end-Pumped Q-switched solid-state lasers: influence of energy-transfer upconversion
Journal of the Optical Society of America B, 2002Co-Authors: Yung-fu Chen, Yu-pin Lan, Shing Chung WangAbstract:The influence of energy-transfer upconversion (ETU) on diode-end-Pumped actively Q-switched lasers is investigated by the space-dependent rate equation analysis. The numerical analysis reveals that as a consequence of the ETU effect there is an optimum Pump Size for yielding the largest pulse energy and a different optimum Pump for yielding the highest peak power at a given Pump power. The practical example of the diode-Pumped actively Q-switched Nd:YAG laser has been used to verify the present model.
-
Influence of energy-transfer upconversion on the performance of high-power diode-end-Pumped CW lasers
IEEE Journal of Quantum Electronics, 2000Co-Authors: Yung-fu Chen, Yu-pin Lan, Shing Chung WangAbstract:The influence of energy-transfer upconversion (ETU) on the performance of diode-end-Pumped lasers is studied by including ETU effects into the space-dependent rate equations. The dependence of ETU rates on the mode-to-Pump Size ratio and on the output mirror transmission is derived. Experiments for Nd:YAG and Nd:YVO/sub 4/ crystals are performed to validate the present model. It is found that the ETU process increases the sensitivity of the output power to the output mirror transmission but its influence on the output power is not significant for low output transmission.
D. Leduc - One of the best experts on this subject based on the ideXlab platform.
-
Spatial patterns in optical parametric oscillators with spherical mirrors: classical and quantum effects.
Optics express, 1998Co-Authors: Monika A. M. Marte, Helmut Ritsch, K. I. Petsas, Alessandra Gatti, Luigi A. Lugiato, Claude Fabre, D. LeducAbstract:We investigate the formation of transverse patterns in a doubly resonant degenerate optical parametric oscillator. Extending previous work, we treat the more realistic case of a spherical mirror cavity with a finite–Sized input Pump field. Using numerical simulations in real space, we determine the conditions on the cavity geometry, Pump Size and detunings for which pattern formation occurs; we find multistability of different types of optical patterns. Below threshold, we analyze the dependence of the quantum image on the width of the input field, in the near and in the far field.
-
Spatial patterns in optical parametric oscillators with spherical mirrors: classical and quantum effects: errata
Optics express, 1998Co-Authors: Monika A. M. Marte, Helmut Ritsch, K. I. Petsas, Alessandra Gatti, Luigi A. Lugiato, Claude Fabre, D. LeducAbstract:We investigate the formation of transverse patterns in a doubly resonant degenerate optical parametric oscillator. Extending previous work, we treat the more realistic case of a spherical mirror cavity with a finite–Sized input Pump field. Using numerical simulations in real space, we determine the conditions on the cavity geometry, Pump Size and detunings for which pattern formation occurs; we find multistability of different types of optical patterns. Below threshold, we analyze the dependence of the quantum image on the width of the input field, in the near and in the far field.
S. C. Wang - One of the best experts on this subject based on the ideXlab platform.
-
Generation of Laguerre–Gaussian modes in fiber-coupled laser diode end-Pumped lasers
Applied Physics B, 2001Co-Authors: Y. F. Chen, Yu-pin Lan, S. C. WangAbstract:A technique has been developed for the generation of Laguerre–Gaussian (LG0,l) modes in a fiber-coupled laser diode end-Pumped microchip laser. A theoretical model is also developed to predict how the oscillation of LG0,l modes is affected by the Pump position, the Pump Size and the cavity mode Size. With a 1-W fiber-coupled diode, the highest-order LG0,l mode that can be generated is l=23.
-
Analysis of the effect of Pump position on transverse modes in fiber-coupled laser-diode end Pumped lasers
Optics Communications, 1997Co-Authors: Yung-fu Chen, T. M. Huang, K. H. Lin, C. F. Kao, C. L. Wang, S. C. WangAbstract:Abstract We have derived a formula to study the effect of Pump position on transverse modes of end-Pumped solid-state lasers. From this formula an analytical expression relating the threshold power of the single TEM n ,0 -mode oscillation to the Pump position can be obtained with suitable average Pump Size. The permissible limit to obtain single-transverse-mode operation can be also determined. Experimental results have shown a fairly good agreement with the theoretical predictions.
-
Single-mode oscillation of compact fiber-coupled laser-diode-Pumped Nd:YVO/sub 4//KTP green laser
IEEE Photonics Technology Letters, 1997Co-Authors: Yung-fu Chen, T. M. Huang, C. F. Kao, C. L. Wang, L.j. Lee, S. C. WangAbstract:A compact efficient single-longitudinal-mode green laser has been demonstrated in a simple resonator formed by a coated Nd:YVO/sub 4/ crystal and a coated KTP crystal. The thermal-induced lens in the crystal provides a stable resonator with a good overlap of laser mode and Pump Size due to the circular Pump profile of the fiber-coupled diode. Under the optimum cavity-length condition, 206 mW of green output power corresponding to a conversion efficiency 26.8% was obtained when Pumped by a 770 mW fiber-coupled laser diode.
Dae Y. Jung - One of the best experts on this subject based on the ideXlab platform.
-
Development of a New Moving–Actuator Type Electromechanical Total Artificial Heart
Artificial organs, 2008Co-Authors: Byoung Goo Min, Hyunchul Kim, Sang Hoon Lee, In Y. Kim, Jong W. Kim, Jinwook Choi, Jin T. Kim, Dae Y. JungAbstract:A new type of electromechanical total artificial heart based on a moving-actuator mechanism was developed to decrease the total Pump Size and to improve the fitting characteristic of the Pump to atrial remnants and arterial vessels. The blood Pump consists of three major parts: right and left blood sacs and a moving Pump actuator between two sacs. The total weight is 810 g and the volume of the Pump is 770 ml. The actuator rolls back and forth on a circular track, producing alternating blood ejection. The Pump performance was evaluated in mock circulation and animal implant experiments. The Pump was implanted for 100 h in a calf (approximately 100 kg) with a stable hemodynamic state until accidental (electrical short circuit) death.
