Browsing by Author "Omatsu, T."

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Bottle beam generation from a frequency-doubled Nd:YVO4 laser
(2018-11-08)
Tung, J. C.
;
Ma, Y. Y.
;
Miyamoto, K.
;
Chen, Y. F.
;
Omatsu, T.
We demonstrate, for the first time, the direct generation of a bottle beam with a well-isolated threedimensional zero-intensity dark core (high potential barrier) from a compact intracavity frequency-doubled Nd:YVO4 laser with a nearly hemispherical cavity. We also numerically calculate the physical properties of the generated bottle beam using a coherent superposition of a series of frequency-locked Laguerre-Gaussian modes.
Bottle beam generation from a frequency-doubled Nd:YVO4 laser with a tightly end-pumping geometry
(2018-01-01)
Tung, J. C.
;
Ma, Y. Y.
;
Chen, Y. F.
;
Miyamoto, K.
;
Omatsu, T.
We first demonstrated the generation of an optical bottle beam with a zero-intensity region surrounded by three-dimensional bright regions from an intra-cavity frequency-doubled Nd:YVO4 laser with a nearly hemispherical cavity configuration. We also numerically analyzed the components of the generated bottle beam which consists of a series of Laguerre-Gaussian modes. The experimental results can be excellently reconstructed with the theoretical model.
Direct generation of a 'bottle beam' from an end-pumped Nd:YVO4 laser with second-harmonic generation
(2018-01-01)
Tung, J. C.
;
Ma, Y. Y.
;
Chen, Y. F.
;
Huang, K. F.
;
Omatsu, T.
We have demonstrated, for the first time, the generation of an optical 'bottle beam' with a 'zero-intensity' region surrounded by three-dimensional bright regions from an intra-cavity frequency-doubled Nd:YVO4 laser with a nearly hemispherical cavity configuration.
Exploring the self-mode locking and vortex structures of nonplanar elliptical modes in selectively end-pumped Nd: YVO4 lasers: manifestation of large fractional orbital angular momentum
(2017-09-18)
Tung, J. C.
;
Omatsu, T.
;
Liang, H. C.
;
Huang, K. F.
;
Chen, Y. F.
An end-pumped Nd: YVO4 laser under selective pumping is used to excite lasing modes with transverse patterns performed to exhibit the characteristics of multiple spots arranged on elliptical features near degenerate cavities. The spatial distribution of elliptical lasing modes is clearly revealed to be localized on the nonplanar ray orbits, so-called nonplanar elliptical modes, which possess large fractional orbital angular momentum. Moreover, temporal dynamics for the output emission of nonplanar elliptical modes are verified to obtain self-mode-locked operation. We further numerically manifest not only the influence of radial-asymmetry distributions on the vortex structures of nonplanar elliptical modes, but also the vector field of transverse lasing modes altered with twisting phase structures in the propagation direction. (C) 2017 Optical Society of America
Generating laser transverse modes analogous to quantum Green's functions of two-dimensional harmonic oscillators
(2017-12-01)
Tung, J. C.
;
Hsieh, Y. H.
;
Omatsu, T.
;
Huang, K. F.
;
Chen, Y. F.
We theoretically analyzed the relationship between quantum Green's functions of two-dimensional harmonic oscillators and radial-order Laguerre - Gaussian laser modes of spherical resonators. By using a nearly hemispherical resonator and a tight focusing in the end-pumped solid-state laser, we successfully generated various laser transverse modes analogous to quantum Green's functions. We further experimentally and numerically verified that the transverse order associated with quantum Green's functions is noticeably raised with increasing the pump power induced by the thermal effect. More importantly, the high lasing efficiency and the salient structure enable the present laser source to be used in exploring the light -matter interaction. (C) 2017 Chinese Laser Press