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Persistent Hole Burning and Femtosecond Photon Echo Using Diode Laser

使用二极管激光器进行持续烧孔和飞秒光子回波

基本信息

批准号：
01460045
负责人：
NAKATSUKA Hiroki
金额：
$ 0.7万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01460045/
关键词：
persistent hole burning diode laser photon echo optical memory fractal organic dye polymer glass spectral diffusion 位相緩和フェムト秒フォトンエコ-有機非晶質

项目摘要

1. The incoherent light photon echoes by using a cw multi-mode diode laser or a superluminescent diode have been performed for the first time.2. Persistent hole burning has been attracting much attention because of its potentiality as future multi-wavelength optical memory. We found out an efficient persistent hole burning material HITC/PVA at the wavelength region of conventional diode lasers, near 780 nm.3. Using the wavelength sweep by changing the injection current into diode lasers, we observed the time evolution of the persistent hole in HITC/PVA with a temporal resolution of 10 msec.4. We found that the persistent hole in HITC/PVA can be proved more than 1000 times when it was once burnt.5. By using the methods mentioned above, we observed spectral diffusion and self-refilling process of the persistent hole in HITC/PVA.6. We observed the temporal evolution of persistent holes in two samples HITC/PVA (polymeric host) and HITC/EtOH (monomeric host), and explained the behavior by assuming that the two level systems in the host are spatially distributed like a fractal. This theory gives the photon echo decay curve, persistent hole shape and the temperature dependence of the hole width which depend on the fractal dimension D. By comparison with the experiment, we obtained D=2.1 2.3 for HITC/PVA and D=2.7 for HITC/EtOH.

1．首次利用连续多模二极管激光器或超辐射发光二极管进行非相干光光子回波。2．持久烧孔因其作为未来多波长光学存储器的潜力而备受关注。我们在传统二极管激光器的波长区域（780 nm 附近）发现了一种高效的持久烧孔材料 HITC/PVA。3。通过改变二极管激光器的注入电流来进行波长扫描，我们以 10 毫秒的时间分辨率观察了 HITC/PVA 中持久空穴的时间演化。4。我们发现，HITC/PVA经燃烧1000次以上，仍可证明其持久性空洞。5．利用上述方法，我们观察到了HITC/PVA.6中持久空穴的光谱扩散和自填充过程。我们观察了 HITC/PVA（聚合物主体）和 HITC/EtOH（单体主体）两个样品中持久空穴的时间演化，并通过假设主体中的两个能级系统像分形一样在空间上分布来解释该行为。该理论给出了光子回波衰减曲线、持续孔形状以及孔宽度对分形维数D的温度依赖性。通过与实验比较，我们得到HITC/PVA的D=2.1 2.3和HITC/EtOH的D=2.7。