The focusing of Ne metastable atoms trapped in magnetic-optical trap by a microwave cavity was demonstrated.The cavity was operated at TM010 mode.With a microwave power of 14W,the Ne trap was imaged to a spot of about...The focusing of Ne metastable atoms trapped in magnetic-optical trap by a microwave cavity was demonstrated.The cavity was operated at TM010 mode.With a microwave power of 14W,the Ne trap was imaged to a spot of about 0.25mm(full width at half maximum value)which is nearly the geometric-optics limit.展开更多
Guiding of waves between parallel absorbing walls is considered. The principal mode is constructed;its absorption is estimated. The agreement with previous results about reflection of waves from absorbing walls is dis...Guiding of waves between parallel absorbing walls is considered. The principal mode is constructed;its absorption is estimated. The agreement with previous results about reflection of waves from absorbing walls is discussed. Roughly, the effective absorption of the principal mode is proportional the minus third power of the distance between walls, minus 1.5 d power of the wavenumber and minus 0.5 power of the local absorption of the wave in the wall. This estimate is suggested as hint for the design of the atomic waveguides, and also as tool for optimization of attenuation of the amplified spontaneous emission (and suppression of parasitic oscillations) in high power lasers.展开更多
TORI refers to the Tools for Outstanding Research and Investigation;the site with this name has been available since March 2011 to February 2013 at http://tori.ils.uec.ac.jp;the clone is available at http://mizugadro....TORI refers to the Tools for Outstanding Research and Investigation;the site with this name has been available since March 2011 to February 2013 at http://tori.ils.uec.ac.jp;the clone is available at http://mizugadro.mydns.jp/t. TORI is based on 6 axioms;any scientific concept is postulated to have the following properties: applicability, verifiability, refutability, self-consistency, principle of correspondence and pluralism. The examples of application in physics are suggested.展开更多
A rotating neodymium-doped yttrium aluminum garnet(Nd:YAG)disk laser resonator for efficiently generating vector beams with azimuthal and radial polarization is demonstrated.In the study,the laser crystal rotary for t...A rotating neodymium-doped yttrium aluminum garnet(Nd:YAG)disk laser resonator for efficiently generating vector beams with azimuthal and radial polarization is demonstrated.In the study,the laser crystal rotary for thermal alleviation and polarization discrimination uses c-cut ytterbium vanadate(YVO_(4)).The laser output could be switched between azimuthal and radial polarizations by simply adjusting the cavity length.The laser power reached 4.38 W and 4.64W for azimuthally and radially polarized beams at the slope efficiencies of 45.3%and 48.5%,respectively.Our study proved that an efficient,high-power vector rotary disk laser would be realistic.展开更多
We demonstrate a linearly-polarized, ytterbium-doped fiber laser that uses an uncoated, undoped ceramic YAG plate as the output coupler, and the corresponding polarization extinction ratio of laser beam increases with...We demonstrate a linearly-polarized, ytterbium-doped fiber laser that uses an uncoated, undoped ceramic YAG plate as the output coupler, and the corresponding polarization extinction ratio of laser beam increases with incident pump power and then saturates at larger pump power. For comparison, the output coupler of the fiber laser is replaced by 10% reflectivity plane mirror, while the feature of the polarization of laser output is kept unchanged. The results show that the origin of the pump-dependent and self-started polarization is associated with the intensity-dependent nonlinear birefringence in the gain fiber.展开更多
The energy loss spectrum of the molecular nitrogen in the energy region 12 -14 eV has been measured at 300 eV impact energy and in the range of scattering angles of 2.75℃- 10.25℃. The differential cross sections and...The energy loss spectrum of the molecular nitrogen in the energy region 12 -14 eV has been measured at 300 eV impact energy and in the range of scattering angles of 2.75℃- 10.25℃. The differential cross sections and generalized oscillator strengths have been determined for individual vibronic excitation band (v’ = 1 - 4) of b1Пu from the ground state of N2 and the absolute optical oscillator strengths have also been obtained by taking the limit of K→ 0. Results have been compared with experimental data and theoretical calculations previously published.展开更多
基金Supported by the Ministry of Education,Science and Culture of Japan.
文摘The focusing of Ne metastable atoms trapped in magnetic-optical trap by a microwave cavity was demonstrated.The cavity was operated at TM010 mode.With a microwave power of 14W,the Ne trap was imaged to a spot of about 0.25mm(full width at half maximum value)which is nearly the geometric-optics limit.
文摘Guiding of waves between parallel absorbing walls is considered. The principal mode is constructed;its absorption is estimated. The agreement with previous results about reflection of waves from absorbing walls is discussed. Roughly, the effective absorption of the principal mode is proportional the minus third power of the distance between walls, minus 1.5 d power of the wavenumber and minus 0.5 power of the local absorption of the wave in the wall. This estimate is suggested as hint for the design of the atomic waveguides, and also as tool for optimization of attenuation of the amplified spontaneous emission (and suppression of parasitic oscillations) in high power lasers.
文摘TORI refers to the Tools for Outstanding Research and Investigation;the site with this name has been available since March 2011 to February 2013 at http://tori.ils.uec.ac.jp;the clone is available at http://mizugadro.mydns.jp/t. TORI is based on 6 axioms;any scientific concept is postulated to have the following properties: applicability, verifiability, refutability, self-consistency, principle of correspondence and pluralism. The examples of application in physics are suggested.
文摘A rotating neodymium-doped yttrium aluminum garnet(Nd:YAG)disk laser resonator for efficiently generating vector beams with azimuthal and radial polarization is demonstrated.In the study,the laser crystal rotary for thermal alleviation and polarization discrimination uses c-cut ytterbium vanadate(YVO_(4)).The laser output could be switched between azimuthal and radial polarizations by simply adjusting the cavity length.The laser power reached 4.38 W and 4.64W for azimuthally and radially polarized beams at the slope efficiencies of 45.3%and 48.5%,respectively.Our study proved that an efficient,high-power vector rotary disk laser would be realistic.
文摘We demonstrate a linearly-polarized, ytterbium-doped fiber laser that uses an uncoated, undoped ceramic YAG plate as the output coupler, and the corresponding polarization extinction ratio of laser beam increases with incident pump power and then saturates at larger pump power. For comparison, the output coupler of the fiber laser is replaced by 10% reflectivity plane mirror, while the feature of the polarization of laser output is kept unchanged. The results show that the origin of the pump-dependent and self-started polarization is associated with the intensity-dependent nonlinear birefringence in the gain fiber.
基金Project partially supported by the Ministry of Education,Science and Culture of Japan and the National Natural Science Foundation of China.
文摘The energy loss spectrum of the molecular nitrogen in the energy region 12 -14 eV has been measured at 300 eV impact energy and in the range of scattering angles of 2.75℃- 10.25℃. The differential cross sections and generalized oscillator strengths have been determined for individual vibronic excitation band (v’ = 1 - 4) of b1Пu from the ground state of N2 and the absolute optical oscillator strengths have also been obtained by taking the limit of K→ 0. Results have been compared with experimental data and theoretical calculations previously published.
