Study of the attenuator for the high extinction ratio testing system
-
摘要: 为了提高消光比测试系统的测试精确度,利用偏振干涉原理研究设计了一种用于此系统的衰减器,并对它的工作机理进行了详细分析。此衰减器主要包括3个偏光棱镜,1个λ/4波片(632.8nm),两个步近电机。它可以对光强度进行连续调节,其调节范围在0~60dB之间,插入损耗小于1.5dB,消除了以往更换固定衰减量的衰减器带来的误差。此光衰减器用在高消光比测试系统中可以得到优于10-7量级的消光比,它不仅可以用于高消光比测试系统,同样可用于其它光学测试系统。当用消色差波片代替λ/4波片时,它能对多种波长的光进行衰减,扩大测试系统对光谱区的使用范围。Abstract: In order to improve the measuring accuracy of the intelligence high extinction ratio measuring system,the polarization interference principle is used to study and design an attenuator used in the system,and the attenuator's principle is analyzed carefully.The attenuator is consisted of three polarization prisms,one λ/4 wave-plate(λ=632.8nm),and two stepper motors.It can continuously adjust intensity of light within the range of about 0~60dB and the insertion lossof less than 1.5dB,so the aberration generated by changing attenuator with fixing attenuation value can be canceled effectively.If the attenuator is used to measure the extinction,the extinction ratio better than 10-7 can be obtained.The attenuator can be used not only in the high extinction ratio measuring system,but also in other optical measuring systems.The attenuator can adjust kinds of wavelength lights with achromatic plate in place of λ/4 wave-plate,so the useful range can be expanded.
-
Keywords:
- optical devices /
- attenuator /
- polarization interference /
- extinction ratio /
- attenuation value
-
-
[1] ZHANG J B,LI G H,ZHAO M Sh.Study on the feasibility about automatic measurements of extinction ration[J].Journal of Optoelectronic s · Laser,1995,12 (6):343～347 (in Chinese).
[2] WANG Zh B,LI G H,LUSh L et al.Experimental study of the extinction ratio auto-measuring system[J].Chinese Journal of Lasers,2000,5(5):415～418(in Chinese).
[3] LIU X Zh,LI G P,WU B N et al.Study of an instrument with three wavelengths for measuring the extinction radio of laser crystal[J].Applied Optics,16(6):14～16(in Chinese).
[4] LIU X Zh,LI G P,YANG Zh J et al.Study of the measurement of crystal extinction ratio by the use of a single 1/4 wave plate[J].Chinese Journal of Lasers,1999,26 (7):599～601 (in Chinese).
[5] WANG G H,WU F Q.Effect of magnetic circular dichroism on Faraday rotator's extinction ration[J].Laser Technology,1999,23 (6):350～352(in Chinese).
[6] ZHENG Ch H,SONG L K,LIANG R R.Optimization design scheme for three in one composite achromaticλ/4 wave plate[J].Chinese Journal of Lasers,2004,31 (6):662～664(in Chinese).
[7] XUE D,LI G H,HAO D Zh et al.Achromatic analysis of the two-inone composite 1/4 wave-plate[J].Laser Technology,2004,28 (2):184～185 (in Chinese).
[8] HAO D Zh,WU F Q.Measurement of the phase retardation of waveplate using beam splitting and differential method[J].Laser Technology,2005,29 (1):80～81 (in Chinese).
[9] WANG W,LI G H,WU F Q et al.A new method of measuring wave plate phase delay and fast axis azimuth[J].Chinese Journal of Lasers,2003,30 (12):1121～1123 (in Chinese).
[10] SHI Sh X,ZHANG H X,LIU J S.Physical optics and applied optics[M].Xi'an:Xidian University Press,2000.230～234(in Chinese).
计量
- 文章访问数: 0
- HTML全文浏览量: 0
- PDF下载量: 9
下载: