Research on biexcitons by ultra-high resolution two-photon solid state spectroscopy

超高分辨率双光子固态光谱研究双激子

• 批准号: 02452033
• 负责人: NAGASAWA Nobukata
• 金额: $ 5.06万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-02452033/
• 关键词: Solid state spectroscopy; Laser spectroscopy; CuCl; Biexciton; Nonlinear spectroscopy; 非線形光学; 非線型光学

CuCl crystal gathers much notice as one of the model materials for developing optical devices because of the large optical nonlinearity due to the two-photon resonance of biexcitons. However, the estimation of the level width of biexciton (gamma_M) which is necessary to estimate the nonlinear susceptibility and to clarify the origin of photon-noise of optical devices is difficult because of the broad line width of the ordinary pulse laser light which is used to measure gamma_M. The purpose of this research are 1) to develop a UV light source of very narrow linewidth and moderate peak power by frequency doubling of IR light from a dye amplified Ti-sapphire ring laser, 2) to measure gamma_M directly with it and 3) to apply this high resolution spectroscopy to the research on solid state quantum physics.The results are as follows,l. Pulsed UV light of very narrow line width (1mueV) and of moderate power density (1OOkW/cm^2) was generated.2. The two-photon resonance of biexcitons was observed by this UV light.3. The value of gamma_M was obtained to be 24mueV under very weak excitation density (<1kW/cm^2).4. Increase of gamma_M was found under the excitation density of >lkW/cm^2.This research is the first successful example of the ultra-high resolution nonlinear spectroscopy on intrinsic electronic excitation state in solid state material, so various progress is expected from now on.

CuCl晶体由于双激子共振引起的大的光学非线性，作为开发光学器件的模型材料之一受到广泛关注。然而，由于用于测量gamma_M的普通脉冲激光的线宽较宽，估计双激子能级宽度（gamma_M）是估计光学器件非线性磁化率和阐明光子噪声来源所必需的。本研究的目的是：1)利用染料放大钛蓝宝石环形激光器的红外光倍频，开发出线宽很窄、峰值功率适中的紫外光源；2)用它直接测量γ - m； 3)将这种高分辨率光谱技术应用于固态量子物理的研究。结果如下：1。产生了极窄线宽（1mueV）和中等功率密度（100kw /cm^2）的脉冲紫外光。用这种紫外光观察到了双激子的双光子共振。在极弱的激发密度（<1kW/cm^2）下，gamma_M的值为24mueV。在>lkW/cm^2的激发密度下，gamma_M增大。本研究是固体材料本征电子激发态超高分辨率非线性光谱研究的第一个成功实例，今后有望取得多方面的进展。

项目成果

Masahiro Hasuo: "Measurement of the biexciton level width of CuCl at k-0 with a Ti-sapphire ring laser" Optics Communications. 85. 219-222 (1991)

Masahiro Hasuo：“使用钛蓝宝石环形激光器测量 k-0 时 CuCl 的双激子能级宽度”光学通讯。

Masaru Nishino: "Direct measurement of the biexciton level width of CuCl by high resolution nonlinear solid state spectroscopy" Optics Communications.

Masaru Nishino：“通过高分辨率非线性固态光谱直接测量 CuCl 的双激子能级宽度”光学通讯。

Masaru Nishino: "Direct mesurement of the biexciton level width of CuCl by high resolution nonlinear solid state spectroscopy" OPTICS COMMUNICATIONS.

Masaru Nishino：“通过高分辨率非线性固态光谱直接测量 CuCl 的双激子能级宽度”光学通讯。

Masahiro Hasuo: "Measurement of the biexciton level width of CuCl at k 〜 0 with a Ti-sapphire ring laser" OPTICS COMMUNICATIONS. 85. 219-222 (1991)

Masahiro Hasuo：“用钛蓝宝石环形激光器测量 k ~ 0 时 CuCl 的双激子能级宽度”，光学通讯 85. 219-222 (1991)。

Masaru Nishino: "Direct mesurement of the biexciton level width of CuCl by high resolution ninlinear solid state spectroscopy" OPTICS COMMUNICATIONS.

Masaru Nishino：“通过高分辨率非线性固态光谱直接测量 CuCl 的双激子能级宽度”光学通讯。