今年2月在纽约召开的美帝物理协会年会上,报告和展览了去年所取得的一些成就。会议谈到了金属蒸汽激光器的进展。展品中比较突出的是美帝无线电公司研制的氦-硒激光器,它可以在电磁波谱的可见区产生24条谱线。在一次技术性会议上,布鲁克林工业大学的研究人员报导了一种脉冲铜蒸汽激光器。
A four-level tripod active-Raman-gain scheme is analyzed for obtaining phase-controlled gain, phase shift, and group velocity at room temperature. The scheme can be used to eliminate significant probe field attenuation or distortion which is unavoidable i
稀土上转换发光纳米颗粒(UCNPs)可将近红外光转化为紫外可见光,能有效解决光动力抗菌疗法(PACT)中组织穿透深度小、治疗效率低的问题。综述了基于稀土上转换发光纳米平台的光动力抗菌疗法的研究进展,并对新型联合抗菌平台的开发及其在临床上的应用进行了展望。
在受驱动光学系统中增设内腔多光子吸收元件是抑制腔场噪声的有效手段。为在好腔条件(k《γ∥,γ⊥)下获得低噪声强光场,应选用高吸收非线性元件。若所需场强较弱,在主动腔状态应选用非线性吸收最低的双光子吸收体,在被动腔状态则应让系统工作在无吸收状态。
分析了引起磁光石榴石薄膜光衰减的各种因素,导出了光吸收系数α和光散射系数γ的表达式。采用磁光调制比较法测量了(BiTm)3(FeGa)5O12薄膜的α、γ值。与通常方法相比,这种方法不仅消除了衬底吸收,薄膜-衬底界面反射对测量α值的影响,而且可以将γ与α分离开来,从而使得到的α值比较接近于真值。
Digital speckle pattern interferometry (DSPI) is a high-precision deformation measurement technique for planar objects. However, for curved objects, the three-dimensional (3D) shape information is needed in order to obtain correct deformation measurement
这是一项借助于匈牙利物理研究中心和自动化研究所的光学设备完成的工作。
We have performed a pump and probe experiment for real-time reflectivity measurements as a function of superimposed laser shots at the fluence below the ablation threshold to induce nanostructure formation on thin films of diamond-like carbon (DLC). The e
We propose a speckle-reduction method based on wavelength characteristics of speckle effect in synthetic aperture imaging ladar (SAIL). The return signal, which is the back scattering field with speckle effect from the rough surface of target, can be inte