National Aeronautics and Space Administration

Goddard Space Flight Center

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Key Technologies

Compact efficient molecular Doppler receiver

Doppler receiver modules (left) are enclosed (right) in an environmentally controlled vessel

Holographic Optical Element Telescope/Scanne

Wasatch Photonics Corp

• Primary Optic: Transmission Holographic Optical Element (HOE)
• 45-deg off-axis FOV
• Folded optical path
• 3-rod metering structure
• Static structure, rotating HOE
• Coaxial laser transmission
• Active laser alignment

Tunable Fabry Perot etalon and Controller

The Fabry Perot etalon has three sub-apertures (left) corresponding to the filter bandpass functions labeled Edge1, Edge2 and Locking Channel in the Figure (right). Each channel has nearly identical optical properties (peak transmission, finesse, free spectral range) with a slightly different bandpass center frequency. The separation of the two edge filters is chosen so that the sensitivity of the broader molecular signal is equal to that of the narrower aerosol signal. The locking etalon peak is located such that the outgoing laser frequency is aligned to the half width half height point of the locking filter bandpass.

Single Frequency, Nd:YAG laser at Wavelength=355 nm

Fibertek, Inc.

• Utilizes a dual compartment optical cavity
• Oscillator and electronic modules in one compartment
• Power amplifiers, SHG and THG in 2nd compartment
• Folded optical path reduces overall volume