Interferometric filters for spectral discrimination in high-spectral-resolution lidar: performance comparisons between Fabry-Perot interferometer and field-widened Michelson interferometer.

Thanks to wavelength flexibility, interferometric filters such as Fabry-Perot interferometers (FPIs) and field-widened Michelson interferometers (FWMIs) have shown great convenience for spectrally separating the molecule and aerosol scattering components in the high-spectral-resolution lidar (HSRL) return signal. In this paper, performance comparisons between the FPI and FWMI as a spectroscopic discrimination filter in HSRL are performed. We first present a theoretical method for spectral transmission analysis and quantitative evaluation on the spectral discrimination. Then the process in determining the parameters of the FPI and FWMI for the performance comparisons is described. The influences from the incident field of view (FOV), the cumulative wavefront error induced by practical imperfections, and the frequency locking error on the spectral discrimination performance of the two filters are discussed in detail. Quantitative analyses demonstrate that FPI can produce higher transmittance while the remarkable spectral discrimination is one of the most appealing advantages of FWMI. As a result of the field-widened design, the FWMI still performs well even under the illumination with large FOV while the FPI is only qualified for a small incident angle. The cumulative wavefront error attaches a great effect on the spectral discrimination performance of the interferometric filters. We suggest if a cumulative wavefront error is less than 0.05 waves RMS, it is beneficial to employ the FWMI; otherwise, FPI may be more proper. Although the FWMI shows much more sensitivity to the frequency locking error, it can outperform the FPI given a locking error less than 0.1 GHz is achieved. In summary, the FWMI is very competent in HSRL applications if these practical engineering and control problems can be solved, theoretically. Some other estimations neglected in this paper can also be carried out through the analytical method illustrated herein.

[1]  Jacques Pelon,et al.  Simultaneous measurements of particle backscattering and extinction coefficients and wind velocity by lidar with a Mach-Zehnder interferometer: principle of operation and performance assessment. , 2003, Applied optics.

[2]  Gordon G. Shepherd,et al.  Wide-Angle Michelson Interferometer for Measuring Doppler Line Widths* , 1966 .

[3]  F. G. Fernald.  Analysis of atmospheric lidar observations: some comments. , 1984, Applied optics.

[4]  E. Eloranta,et al.  High spectral resolution lidar to measure optical scattering properties of atmospheric aerosols. 1: theory and instrumentation. , 1983, Applied optics.

[5]  Maximum-likelihood optimization of a Fabry–Perot interferometer for thermospheric temperature and wind measurements , 1982 .

[6]  Influence of molecular scattering models on aerosol optical properties measured by high spectral resolution lidar. , 2009, Applied optics.

[7]  David S. Hoffman,et al.  Development of a high spectral resolution lidar based on confocal Fabry-Perot spectral filters. , 2012, Applied optics.

[8]  W. Gault,et al.  Optimization of a field-widened Michelson interferometer. , 1985, Applied optics.

[9]  Dong Liu,et al.  Retrieval and analysis of a polarized high-spectral-resolution lidar for profiling aerosol optical properties. , 2013, Optics express.

[10]  E. Eloranta,et al.  Demonstration of a high-spectral-resolution lidar based on an iodine absorption filter. , 1994, Optics letters.

[11]  E. Eloranta,et al.  High spectral resolution lidar to measure optical scattering properties of atmospheric aerosols. 2: calibration and data analysis. , 1983, Applied optics.

[12]  S. A. Lee,et al.  High spectral resolution lidar system with atomic blocking filters for measuring atmospheric parameters. , 1983, Applied optics.

[13]  J. Klett.  Stable analytical inversion solution for processing lidar returns. , 1981, Applied optics.

[14]  W R Skinner,et al.  Analysis techniques for the recovery of winds and backscatter coefficients from a multiple-channel incoherent Doppler lidar. , 1997, Applied optics.

[15]  Gerhard Ehret,et al.  Airborne high spectral resolution lidar for measuring aerosol extinction and backscatter coefficients. , 2008, Applied optics.

[16]  Didier Bruneau,et al.  Wind-velocity lidar measurements by use of a Mach-Zehnder interferometer, comparison with a Fabry-Perot interferometer. , 2004, Applied optics.

[17]  D Bruneau,et al.  Mach-zehnder interferometer as a spectral analyzer for molecular Doppler wind lidar. , 2001, Applied optics.

[18]  L. M. Caldwell,et al.  High-spectral-resolution Rayleigh-Mie lidar measurement of aerosol and atmospheric profiles. , 1992, Optics letters.

[19]  Dong Liu,et al.  System analysis of a tilted field-widened Michelson interferometer for high spectral resolution lidar. , 2012, Optics express.

[20]  Wayne C. Welch,et al.  Airborne high spectral resolution lidar for profiling aerosol optical properties. , 2008, Applied optics.

[21]  Zhaoyan Liu,et al.  High-spectral-resolution lidar using an iodine absorption filter for atmospheric measurements , 1999 .

[22]  C Flesia,et al.  Theory of the double-edge molecular technique for Doppler lidar wind measurement. , 1999, Applied optics.

[23]  G. Shepherd,et al.  Application of Doppler Michelson imaging to upper atmospheric wind measurement: WINDII and beyond. , 1996, Applied optics.

[24]  G. Thuillier,et al.  Fully compensated Michelson interferometer of fixed-path difference. , 1985, Applied optics.

[25]  J. W. Haslett,et al.  WAMDII: wide-angle Michelson Doppler imaging interferometer for Spacelab , 1985 .

[26]  G. Hernandez,et al.  Analytical description of a Fabry-Perot photoelectric spectrometer. , 1966, Applied optics.

[27]  P. Hays,et al.  A technique for recovering Doppler line profiles from fabry-perot interferometer fringes of very low intensity. , 1971, Applied optics.

[28]  G. Thuillier,et al.  Thermally stable field compensated Michelson interferometer for measurement of temperature and wind of the planetary atmospheres. , 1991, Applied optics.