Two-Photon Sepctroscopy on Excitons in Cu_2O with Developing a High Precision Spectroscopy Systen

Cu_2O中激子的双光子光谱研究及高精度光谱系统的开发

• 批准号: 08454077
• 负责人: HASUO Masahiro
• 金额: $ 0.51万
• 依托单位: KYOTO UNIVERSITY (1997)The University of Tokyo (1996)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08454077/
• 关键词: exciton; semiconductor; Cu_2O; Rydberg state; nonlinear optics; diamagnetic shift; photo conductivity; photo voltaic effect

Cu_2O is one of model materials in which Wannier exciton series are clearly observed. It has been found from high resolution spectroscopic studies sofar that exciton states of large principle quantum numbers(Rydberg exciton state)are stable in high quality Cu_2O crystals. One the other hand, ls-excitons in Cu_2O gather much notice due to the Bose-Einstein condensation(BEC)of excitons. The purpose of this work is to examine the Ryberg exciton states and the ls exciton state with developing a new spectroscopy system of high precision. Achievements of this work are as follows ;1.A high repetition(^-lkHz)frequency tunable IR laser excited by a CW Q-swiched YAG laser has been developed. A spectroscopy system of high resolution and high sensitivity has been also developed using a high resolution monochromator and a CCD camera.2.Diamagnetic shifts of 3[s-d]and 4[s-d]exciton doublet states have been measured to identifys and dexciton.3.Optical processes associated with the two-photon excitation of ls-ortho-excitons have been measured and discussed in view of the BEC of extions.4.Relaxation processes of ls-ortho-excitons have been examined from analyzes of emission spectra associated with the two-photon excitation of ls-ortho-excitons.5.A system to measure photo conductivity and photo-voltaic effects of Cu_2O at liquid helium temperature has been developed.6.Photo-voltaic effects of Cu_2O has been measured. One-and two-photon photo-voltaic spectroscopy has been demonstrated and its usefulness has been verified.

Cu_2O是模型材料之一，其中清晰地观察到了摇摆不定的激子系列。从高分辨率的光谱研究SOFAR中发现，具有较大原理量子数（Rydberg Icciton状态）的激子状态在高质量的CU_2O晶体中是稳定的。另一方面，Cu_2o中的LS脱位由于激子的Bose-Einstein凝结（BEC）而收集了很多通知。这项工作的目的是检查Ryberg激子状态和LS激子状态，并通过开发高精度的新光谱系统。这项工作的成就如下； 1. 1.高度重复（^ - lkHz）频率可调节激光激发了CW Q-SWICHED YAG激光器的激发。 A spectroscopy system of high resolution and high sensitivity has been also developed using a high resolution monochromator and a CCD camera.2.Diamagnetic shifts of 3[s-d]and 4[s-d]exciton doublet states have been measured to identifys and dexciton.3.Optical processes associated with the two-photon excitation of ls-ortho-excitons have been measured and discussed in view of the BEC of 4. LS-ortho-exciton的递延过程已从与LS-Ortho-Excitons的两光子激发相关的发射光谱的分析中进行了检查。5。一个系统以测量液体氦气在液体温度下的CU_2O的光电率和照相式效应的系统。已经证明了一个和两光子的光伏特光谱法，并已验证其实用性。

项目成果

M.Hasuo: "Study on Secondary Optical Processes by K-Selective Two-Photon Excitation of 1S-Ortho-Excitons in Cu_2O" Proceedings of XXIII International Conference of Physics of Semiconductor. 273-276 (1996)

M.Hasuo：“Cu_2O中1S-正激子的K选择性双光子激发的二次光学过程研究”第二十三届国际半导体物理会议论文集。

M.Hasuo: "Two-Photon Photo-Voltaic Spectroscopy on Wannier Excitons in Cu_2O" Fizika Tverdogo Tela (Sov.Phys.Solid State). (印刷中). (1998)

M.Hasuo：“Cu_2O 中万尼尔激子的双光子光伏光谱”Fizika Tverdogo Tela（Sov.Phys.Solid State）（出版中）。

M.Hasuo: ""Study on Resonant Secondary Optical Processes by the Two-Photon Excitation of ls-excitons in Cu_2O"" Proceedings of the 2nd Asia Symposium on Condensed Matter Photophysics. 357-360 (1996)

M.Hasuo：“Cu_2O中ls-激子双光子激发的共振二次光学过程研究”第二届亚洲凝聚态光物理学研讨会论文集。

M.Hasuo: "Study on Resonant Secondary Optical Processes by the Two-Photon Excitation of 1s-excitons in Cu_2O" Proceedings of the 2nd Asia Symposium on Condensed Matter Photophysics. 357-360 (1996)

M.Hasuo：“Cu_2O中1s激子双光子激发的共振二次光学过程研究”第二届亚洲凝聚态光物理学研讨会论文集。

M.Hasuo: ""Two-Photon Photo-Voltaic Spectroscopy on Wannier Excitons in Cu_2O"" Fizika Tverdogo Tela(Sov.Phys.Solid State). (in print).

M.Hasuo：“Cu_2O 中万尼尔激子的双光子光伏光谱”Fizika Tverdogo Tela（Sov.Phys.Solid State）。