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Multiplexed dispersive spectrometers using reduced background infrared detectors.

C L Wyatt, R W Esplin

|February 6, 2010

Summary

Multiplex spectrometry for cooled photodetectors is hindered by system noise, limiting throughput. Doubly encoded systems offer potential throughput gains proportional to matrix elements, overcoming bandwidth limitations.

Area of Science:

Optics and Photonics
Infrared Technology
Detector Physics

Background:

Multiplex spectrometry is applied to cryogenically cooled Long-Wave Infrared (LWIR) extrinsic photodetectors.
System noise is a primary limitation in these applications.
Detector Noise Equivalent Power (NEP) is directly proportional to bandwidth.

Purpose of the Study:

To investigate the limitations of multiplex spectrometry in LWIR photodetectors.
To explore alternative multiplexing schemes for improved performance.
To identify strategies for enhancing detector throughput.

Main Methods:

Analysis of noise limitations in multiplexed photodetector systems.
Evaluation of bandwidth dependency of detector NEP.

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Theoretical assessment of doubly encoded multiplexing strategies (2n - 1 and n + N - 1 measurements).

Main Results:

Increased bandwidth in multiplex schemes does not yield significant advantages due to noise limitations.
Doubly encoded systems demonstrate potential for real throughput gain.
Throughput gain is proportional to the number of elements in the throughput matrix.

Conclusions:

System noise fundamentally limits multiplex spectrometry for cooled LWIR photodetectors.
Doubly encoded multiplexing offers a viable path to increase detector throughput.
Future research should focus on doubly encoded systems to overcome bandwidth constraints.