Abstract: Measurements were carried out on the spectral properties of the transmission volume holo-graphic north DCG filter using an ult raviolet/visible transmittance spectrometer.The experimental results show that the filter has anarrow bandwidth,a half-bandwidth less than 13nm,and 1/10width of the bandwidth is less than 19nm.The relative transmittance of ma in spectrum of this filter is less than 2%in the visible region between 400nm and 800nm,and,the rela tive transmittance of other spectra are more than 85%.The results indicate that this new kind of filter has an excellent filter characteristic to the main spectrum of LD-pumped laser at the wavelength of 532.0nm.