We demonstrate a dual-wavelength passively Q-switched Nd^（3＋）-doped glass fiber laser using a few-layer topological insulator Bi2Se3 as a saturable absorber（SA） for the first time, to the best of our knowledge. T...We demonstrate a dual-wavelength passively Q-switched Nd^（3＋）-doped glass fiber laser using a few-layer topological insulator Bi2Se3 as a saturable absorber（SA） for the first time, to the best of our knowledge. The laser resonator is a simple and compact linear cavity using two fiber end-facet mirrors. The SA is fabricated by Bi2Se3/polyvinyl alcohol composite film. By inserting the SA into the laser cavity, a stable Q-switching operation is achieved with the shortest pulse width and maximum pulse repetition rate of 601 ns and 205.2 kHz,respectively. The maximum average output power and maximum pulse energy obtained are about 6.6 mW and 38.8 nJ, respectively.展开更多
The direct generation of passively Q-switched lasers at a green wavelength has rarely been investigated in the past.In this Letter,we demonstrate a passively Q-switched praseodymium-doped yttrium lithium fluoride gree...The direct generation of passively Q-switched lasers at a green wavelength has rarely been investigated in the past.In this Letter,we demonstrate a passively Q-switched praseodymium-doped yttrium lithium fluoride green laser at 522 nm using CdTe/CdS quantum dots as a saturable absorber.A maximum average output power of 33.6 m W is achieved with the shortest pulse width of 840 ns.The corresponding pulse energy and peak power reached 0.18μJ and 0.21 W,respectively.To the best of our knowledge,this is the first demonstration in regard to a quantum dots saturable absorber operating in the green spectral region.展开更多
The non-local optical interaction of two semiconductor microdisks with a waveguide bridged at radial direction is proposed and studied by three dimensional finite-difference time-domain （FDTD） electromagnetic simula...The non-local optical interaction of two semiconductor microdisks with a waveguide bridged at radial direction is proposed and studied by three dimensional finite-difference time-domain （FDTD） electromagnetic simulations. The strong and weak optical interactions between two microdisks are observed and ascribed to the internal coupled modes with different coupling ratios. The vertical radiation losses and the related mode quality factors are modulated by waveguide length and present oscillation characteristics for the resonant modes. In addition, the optical leakage of coupling system is affected by the etching depth of disks due to tile emission of minor components of electric field.展开更多
基金supported by the National Natural Science Foundation of China(NSFC)(No.61275050)the Project funded by the Department of Education of Guizhou Province(No.[2016]140)+3 种基金the Science and Technology Foundation of Guizhou Province(Nos.[2014]2124,[2010]2146,and[2009]06)the Science and Technology Plan Projects of Guizhou Province(No.SY2013[3055])the Science-Technology Union Foundation of Guizhou Province(No.[2014]7045)the International Science-Technology cooperation project of Guizhou Province of China(No.[2013]7019)
文摘We demonstrate a dual-wavelength passively Q-switched Nd^（3＋）-doped glass fiber laser using a few-layer topological insulator Bi2Se3 as a saturable absorber（SA） for the first time, to the best of our knowledge. The laser resonator is a simple and compact linear cavity using two fiber end-facet mirrors. The SA is fabricated by Bi2Se3/polyvinyl alcohol composite film. By inserting the SA into the laser cavity, a stable Q-switching operation is achieved with the shortest pulse width and maximum pulse repetition rate of 601 ns and 205.2 kHz,respectively. The maximum average output power and maximum pulse energy obtained are about 6.6 mW and 38.8 nJ, respectively.
基金supported by the National Natural Science Foundation of China(No.61575164)the Natural Science Foundation of Fujian Province of China(Nos.2017J06016 and 2014J01251)the Shenzhen Science and Technology Projects(No.JCYJ20160414160109018)
文摘The direct generation of passively Q-switched lasers at a green wavelength has rarely been investigated in the past.In this Letter,we demonstrate a passively Q-switched praseodymium-doped yttrium lithium fluoride green laser at 522 nm using CdTe/CdS quantum dots as a saturable absorber.A maximum average output power of 33.6 m W is achieved with the shortest pulse width of 840 ns.The corresponding pulse energy and peak power reached 0.18μJ and 0.21 W,respectively.To the best of our knowledge,this is the first demonstration in regard to a quantum dots saturable absorber operating in the green spectral region.
基金supported by the Fundamental Research Funds for the Central Universities(No.2011121048)the National Natural Science Foundation of China(No.61107045)the Open Project of Integrated Optoelectronic State Key Laboratory(No.2011KFB001)
文摘The non-local optical interaction of two semiconductor microdisks with a waveguide bridged at radial direction is proposed and studied by three dimensional finite-difference time-domain （FDTD） electromagnetic simulations. The strong and weak optical interactions between two microdisks are observed and ascribed to the internal coupled modes with different coupling ratios. The vertical radiation losses and the related mode quality factors are modulated by waveguide length and present oscillation characteristics for the resonant modes. In addition, the optical leakage of coupling system is affected by the etching depth of disks due to tile emission of minor components of electric field.
