Huang Chong, Ouyang Yan-dong, Wu Jian-hong, Yu Yun-peng, Lin Shun-hui
Department of Physics, Shantou University, Shantou, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2005 Apr;25(4):637-8.
Optical filter has extremely important applications in spectroscopy, optical measurement and laser physics. Holographic filter, especially the transmission volume holographic notch filters using dichromate gelatin (DCG), is a new kind of filter with the main characteristic of a very narrow bandwidth. In this paper, measurements were carried out on the spectral properties of this transmission volume holographic notch DCG filter using an ultraviolet-visible transmittance spectrometer. The experimental results show that the relative transmittance of main spectrum of this filter is less than 2% in the visible region between 400 and 800 nm, and the relative transmittance of other spectra are more than 85%. Moreover, the filter has a narrow bandwidth with a half-bandwidth less than 12 nm, and a 1/10 width of the bandwidth less than 15 nm. These results indicate that this new kind of filter has an excellent filter characteristic to the main spectrum of Ar+ laser at the wavelength of 514.5 nm.
光学滤波器在光谱学、光学测量和激光物理学中有着极其重要的应用。全息滤波器，特别是使用重铬酸盐明胶（DCG）的透射体全息陷波滤波器，是一种新型滤波器，其主要特点是带宽非常窄。本文利用紫外可见透过率光谱仪对这种透射体全息陷波DCG滤波器的光谱特性进行了测量。实验结果表明，该滤波器在400至800nm的可见光区域内，主光谱的相对透过率小于2%，其他光谱的相对透过率大于85%。此外，该滤波器带宽很窄，半高宽小于12nm，带宽的1/10宽度小于15nm。这些结果表明，这种新型滤波器对波长为514.5nm的Ar+激光主光谱具有优异的滤波特性。
