The mutual interactions of stimulated Raman scattering(SRS)and stimulated four-photon mixing(SFPM)in an Er^(3+)-doped optical fiber have been studied with a tunable pulsed dye laser.Besides normal SRS and SFPM signals...The mutual interactions of stimulated Raman scattering(SRS)and stimulated four-photon mixing(SFPM)in an Er^(3+)-doped optical fiber have been studied with a tunable pulsed dye laser.Besides normal SRS and SFPM signals,we have observed some new spectral lines.Some of the new lines are attributed to three photon mixing(one from the pump,one from the first-order Stokes and one from SFPM)while the others are assigned to new SRS produced by one of the SFPM signals.The mechanisms of the generation of these new spectral lines are discussed.展开更多
A material with the formula ZrMgMo_(3)O_(12) having negative thermal expansion is presented and characterized.It is shown that ZrMgMo_(3)O_(12) crystallizes in an orthorhombic symmetry with space group Pnma(62)or Pna2...A material with the formula ZrMgMo_(3)O_(12) having negative thermal expansion is presented and characterized.It is shown that ZrMgMo_(3)O_(12) crystallizes in an orthorhombic symmetry with space group Pnma(62)or Pna21(33)and exhibits negative thermal expansion in a large temperature range(αl=-3.8×10^(-6) K^(-1) from 300 K to 1000 K by x-ray diffraction andαl=-3.73×10^(-6) K^(-1) from 295 K to 775 K by dilatometer).ZrMgMo_(3)O_(12) remains the orthorhombic structure without phase transition or decomposition at least from 123 K to 1200 K and is not hygroscopic.These properties make it an excellent material with negative thermal expansion for a variety of applications.展开更多
文摘The mutual interactions of stimulated Raman scattering(SRS)and stimulated four-photon mixing(SFPM)in an Er^(3+)-doped optical fiber have been studied with a tunable pulsed dye laser.Besides normal SRS and SFPM signals,we have observed some new spectral lines.Some of the new lines are attributed to three photon mixing(one from the pump,one from the first-order Stokes and one from SFPM)while the others are assigned to new SRS produced by one of the SFPM signals.The mechanisms of the generation of these new spectral lines are discussed.
基金Supported by the National Science Foundation of China(Nos 10974183,11104252)the Ministry of Education of China(No 20114101110003)+1 种基金the Fund for Science&Technology Innovation Team of Zhengzhou(No 112PCXTD337)the Postdoctoral Research Sponsorship in Henan Province(No 2011002).
文摘A material with the formula ZrMgMo_(3)O_(12) having negative thermal expansion is presented and characterized.It is shown that ZrMgMo_(3)O_(12) crystallizes in an orthorhombic symmetry with space group Pnma(62)or Pna21(33)and exhibits negative thermal expansion in a large temperature range(αl=-3.8×10^(-6) K^(-1) from 300 K to 1000 K by x-ray diffraction andαl=-3.73×10^(-6) K^(-1) from 295 K to 775 K by dilatometer).ZrMgMo_(3)O_(12) remains the orthorhombic structure without phase transition or decomposition at least from 123 K to 1200 K and is not hygroscopic.These properties make it an excellent material with negative thermal expansion for a variety of applications.
