Under the resonant excitation of Zn atomic 4p^(3)P_(1) state a strong stimulated emission at 481.0nm is produced,which corresponds to the transition between 5s^(3)S_(1) and 4p^(3)P_(2) of Zn.If N_(2) molecular gas is ...Under the resonant excitation of Zn atomic 4p^(3)P_(1) state a strong stimulated emission at 481.0nm is produced,which corresponds to the transition between 5s^(3)S_(1) and 4p^(3)P_(2) of Zn.If N_(2) molecular gas is used as buffer gas instead of rare gas He or Ar,the stimulated emission may be enhanced by several orders of magnitude.The dependences of intensity on density of atomic Zn and N_(2) pressure are studied experimentally.The mechanism which causes population inversion is propased.展开更多
Under laser excitation of vaporized zinc to 4s4p ^(3)P^(0)_(1) metastable level,the emission bands at violet and ultraviolet ranges were observed.The radiative decay time of 20 ns has been measured for both bands.The ...Under laser excitation of vaporized zinc to 4s4p ^(3)P^(0)_(1) metastable level,the emission bands at violet and ultraviolet ranges were observed.The radiative decay time of 20 ns has been measured for both bands.The temporal behavior and excitation condition indicate that they are possibly from the same state 3Σ^(+)_(u) of Zn_(2) molecule.The wavelength range of the two bands coincides with theoretical predication.展开更多
Stimulated emission was generated at the 722.9nm line of neutral lead atoms by multiphoton dissociation of PbCl_(2) molecules with a DPS dye laser.Anti-Stokes Raman scattering around 283.Snm was also observed.The effe...Stimulated emission was generated at the 722.9nm line of neutral lead atoms by multiphoton dissociation of PbCl_(2) molecules with a DPS dye laser.Anti-Stokes Raman scattering around 283.Snm was also observed.The effects of the heat-pipe oven temperature and pump laser energy on the 722.Snm radiation was studied.The energy conversion efficiency of the 722.9nm laser is about 5%.It provides a way for frequency conversion by multiphoton dissociation of simple molecules with a visible laser.展开更多
In PbCI2 vapor under the mutual interaction of two laser beams with wavelengths atλ1=266nm andλ2=280.2nm(or 282.3nm),a strong coherent emission at 405.8nm is generated,which corresponds to transition between states ...In PbCI2 vapor under the mutual interaction of two laser beams with wavelengths atλ1=266nm andλ2=280.2nm(or 282.3nm),a strong coherent emission at 405.8nm is generated,which corresponds to transition between states 6p7s 3p01 and 6p23p2 in atomic Pb.The dependences of its intensity I405.8 on the power and detuning ofλ2 are measured.The results show that it is caused by a four-wave mixing process in Pb,in which the initial state is a metastable state,6p23p2.展开更多
Under excitation of 355nm or 266nm UV radiation some strong emissions have been observed in PbI_(2) vapor.Analysis shows that they are 1st,2nd order Stokes and 1st anti-Stokes components of 355nm laser and 1st order S...Under excitation of 355nm or 266nm UV radiation some strong emissions have been observed in PbI_(2) vapor.Analysis shows that they are 1st,2nd order Stokes and 1st anti-Stokes components of 355nm laser and 1st order Stokes and enti-Stokes components of 266nm laser.The initial states of Raman transition are 6p23p1 and 6p23p_(2) metastable states of atomic Pb,respectively.The population on it is created by photodissociation of PbI_(2).The dependences of Raman components on pump power,PbI_(2) density and pressure of buffer gas are investigated experimentally.展开更多
Competitive phenomena between stimulated Raman scattering and resonant laser emission In atomic lead are studied through photodissociation of PbCl_(2) with a UV laser.The different dependences of their intensities on ...Competitive phenomena between stimulated Raman scattering and resonant laser emission In atomic lead are studied through photodissociation of PbCl_(2) with a UV laser.The different dependences of their intensities on the UV power,the density of PbCl_(2) and the pressure of buffer gases are investigated.The results indicate that under the conditions of high pump intensity and low buffer gas pressure SRS can have the advantage of RLE.展开更多
The novel material of photonic crystal makes it possible to control a photon, and the photonic integration will have breakthrough progress due to the application of photonic crystal. It is based on the photonic crysta...The novel material of photonic crystal makes it possible to control a photon, and the photonic integration will have breakthrough progress due to the application of photonic crystal. It is based on the photonic crystal device that the photonic crystal integration could be realized. Therefore, we should first investigate photonic crystal devices based on the active and the passive semiconductor materials, which may have great potential application in photonic integration. The most practical and important method to fabricate two-dimensional photonic crystal is the micro-manufacture method. In this paper, we summarize and evaluate the fabrication methods of two-dimensional photonic crystal in near-infrared region, including electron beam lithography, selection of mask, dry etching, and some works of ours. This will be beneficial to the study of the photonic crystal in China.展开更多
基金Supported by the National Natural Science Foundation of China。
文摘Under the resonant excitation of Zn atomic 4p^(3)P_(1) state a strong stimulated emission at 481.0nm is produced,which corresponds to the transition between 5s^(3)S_(1) and 4p^(3)P_(2) of Zn.If N_(2) molecular gas is used as buffer gas instead of rare gas He or Ar,the stimulated emission may be enhanced by several orders of magnitude.The dependences of intensity on density of atomic Zn and N_(2) pressure are studied experimentally.The mechanism which causes population inversion is propased.
基金Supported by National Natural Science Foundation of China.
文摘Under laser excitation of vaporized zinc to 4s4p ^(3)P^(0)_(1) metastable level,the emission bands at violet and ultraviolet ranges were observed.The radiative decay time of 20 ns has been measured for both bands.The temporal behavior and excitation condition indicate that they are possibly from the same state 3Σ^(+)_(u) of Zn_(2) molecule.The wavelength range of the two bands coincides with theoretical predication.
文摘Stimulated emission was generated at the 722.9nm line of neutral lead atoms by multiphoton dissociation of PbCl_(2) molecules with a DPS dye laser.Anti-Stokes Raman scattering around 283.Snm was also observed.The effects of the heat-pipe oven temperature and pump laser energy on the 722.Snm radiation was studied.The energy conversion efficiency of the 722.9nm laser is about 5%.It provides a way for frequency conversion by multiphoton dissociation of simple molecules with a visible laser.
文摘In PbCI2 vapor under the mutual interaction of two laser beams with wavelengths atλ1=266nm andλ2=280.2nm(or 282.3nm),a strong coherent emission at 405.8nm is generated,which corresponds to transition between states 6p7s 3p01 and 6p23p2 in atomic Pb.The dependences of its intensity I405.8 on the power and detuning ofλ2 are measured.The results show that it is caused by a four-wave mixing process in Pb,in which the initial state is a metastable state,6p23p2.
文摘Under excitation of 355nm or 266nm UV radiation some strong emissions have been observed in PbI_(2) vapor.Analysis shows that they are 1st,2nd order Stokes and 1st anti-Stokes components of 355nm laser and 1st order Stokes and enti-Stokes components of 266nm laser.The initial states of Raman transition are 6p23p1 and 6p23p_(2) metastable states of atomic Pb,respectively.The population on it is created by photodissociation of PbI_(2).The dependences of Raman components on pump power,PbI_(2) density and pressure of buffer gas are investigated experimentally.
文摘Competitive phenomena between stimulated Raman scattering and resonant laser emission In atomic lead are studied through photodissociation of PbCl_(2) with a UV laser.The different dependences of their intensities on the UV power,the density of PbCl_(2) and the pressure of buffer gases are investigated.The results indicate that under the conditions of high pump intensity and low buffer gas pressure SRS can have the advantage of RLE.
基金Supported by the National Natural Science Foundation of China (Grant Nos. 60345008, 60377011 and 60537010)the China "863" Program (Grant No. 2005AA311030)
文摘The novel material of photonic crystal makes it possible to control a photon, and the photonic integration will have breakthrough progress due to the application of photonic crystal. It is based on the photonic crystal device that the photonic crystal integration could be realized. Therefore, we should first investigate photonic crystal devices based on the active and the passive semiconductor materials, which may have great potential application in photonic integration. The most practical and important method to fabricate two-dimensional photonic crystal is the micro-manufacture method. In this paper, we summarize and evaluate the fabrication methods of two-dimensional photonic crystal in near-infrared region, including electron beam lithography, selection of mask, dry etching, and some works of ours. This will be beneficial to the study of the photonic crystal in China.
