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Simplified Method of Designing FIR Filter with Controllable Center Frequency
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作者 黄翔东 褚晶辉 +2 位作者 吕卫 崔海涛 王兆华 《Transactions of Tianjin University》 EI CAS 2010年第4期262-266,共5页
A novel simplified method is presented to design FIR filter with controllable center frequency. The properties of transfer curves for all-phase filters are illustrated under 3 windowing conditions. By combining single... A novel simplified method is presented to design FIR filter with controllable center frequency. The properties of transfer curves for all-phase filters are illustrated under 3 windowing conditions. By combining single-window all-phase filter design steps and double phase-shift combination, a series of design formulas for point-pass filter, notch filter, band-pass filter and band-stop filter are derived, thus the design computation complexity is greatly reduced. Experiments prove that the center frequency of all the filters can be accurately specified at arbitrary position by adjusting frequency parameters m and λ. 展开更多
关键词 filter design all-phase double phase-shift combination center frequency
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Narrow-wavelength-spread spectral combining laser with a reflector for a double pass with a single grating 被引量:2
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作者 于娜 周常河 +2 位作者 韦春龙 贾伟 鲁云开 《Chinese Optics Letters》 SCIE EI CAS CSCD 2018年第7期55-59,共5页
We proposed a novel wavelength-spread compression technique for spectral beam combining of a diode laser array. A reflector, which is parallel to the grating, is introduced to achieve a double pass with a single grati... We proposed a novel wavelength-spread compression technique for spectral beam combining of a diode laser array. A reflector, which is parallel to the grating, is introduced to achieve a double pass with a single grating.This facilitated the reduction of the wavelength spread by half and doubled the number of combined elements in the gain range of the diode laser. We achieved a power of 26.1 W under continuous wave operation using a19 element single bar with a wavelength spread of 6.3 nm, which is nearly half of the original wavelength spread of 14.2 nm, demonstrating the double-compressed spectrum capability of this structure. The spectral beam combining efficiency was 63.7%. The grating efficiency and reflector reflectance were both over 95%; hence, the efficiency loss of the double-pass grating with a reflector is acceptable. In contrast to double-grating methods,the proposed method introduces a reflector that efficiently uses the single grating and shows significant potential for a more efficient spectral beam combining of diode laser arrays. 展开更多
关键词 length SBC Narrow-wavelength-spread spectral combining laser with a reflector for a double pass with a single grating
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