Smart active multiwave sensing with zero background amplitude modulated probes

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Description

Recently, a new approach to multi-wavelength remote sensing has been proposed based on the generation and detection of spectral ``pickets`` synthesized from the frequency filtered bandwidth of a modelocked laser. Using linear array liquid crystal spatial light modulator (SLM) technology for spectral filtering permits real time grey scale control of individual picket amplitudes and phases, making it possible to independently modulate picket characteristics in the kHz to MHz regime. Due to the versatility of this approach, a whole suite of spectroscopies based on detection techniques that are similar to conventional sideband spectroscopies can be implemented. These techniques not only inherit ... continued below

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16 p.

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Ruggiero, A.J.; Young, R.A. & Jelsma, L. July 1, 1994.

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Description

Recently, a new approach to multi-wavelength remote sensing has been proposed based on the generation and detection of spectral ``pickets`` synthesized from the frequency filtered bandwidth of a modelocked laser. Using linear array liquid crystal spatial light modulator (SLM) technology for spectral filtering permits real time grey scale control of individual picket amplitudes and phases, making it possible to independently modulate picket characteristics in the kHz to MHz regime. Due to the versatility of this approach, a whole suite of spectroscopies based on detection techniques that are similar to conventional sideband spectroscopies can be implemented. These techniques not only inherit the S/N advantages of their conventional counterparts, they can also be easily extended to simultaneous multi-wavelength operation using frequency multiplex techniques and configured for real time adaptive data acquisition. We report the laboratory demonstration and theoretical development of a new class of zero background AM modulated spectroscopic probes for differential absorption measurements. Preliminary detection sensitivities on the order of 10{sup {minus}6} can be inferred from our measurements. Application of this technique to realistic remote sensing scenarios, advantages over other modulation and direct detection approaches, as well as the present limitations and theoretical limits to detection sensitivity will be discussed.

Physical Description

16 p.

Notes

OSTI as DE95008813

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  • 1994 chemical analysis by laser interrogation of proliferation effluents (CALIOPE ITR) interim technical review, Livermore, CA (United States), 26-28 Apr 1994

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  • Other: DE95008813
  • Report No.: UCRL-JC--118286
  • Report No.: CONF-9404162--19
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 39023
  • Archival Resource Key: ark:/67531/metadc687934

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  • July 1, 1994

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 17, 2016, 4:23 p.m.

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Ruggiero, A.J.; Young, R.A. & Jelsma, L. Smart active multiwave sensing with zero background amplitude modulated probes, article, July 1, 1994; California. (digital.library.unt.edu/ark:/67531/metadc687934/: accessed August 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.