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Cryogenic servo-stabilized Fabry-Perot interferometers for imaging at 3-5 and 8-13 microns

  • N. K. Reay (a1) and K.A.R.B. Pietraszewski (a1)

Abstract

The performance of a new liquid Nitrogen cooled Fabry-Perot etalon for imaging at 3-5µm is described. Capacitance sensors monitor the etalon mirror spacing and parallelism, and error signals produced as a consequence of changes in these parameters are used in a feedback loop with piezoelectric actuators for active cavity control. These new cryogenic etalons are designed to be compatible with the Queensgate Instruments Ltd CS100/ET servo-stabilized Fabry-Perot system.

The cryogenic etalon has a clear aperture of 50mm and a nominal mirror spacing of between 5 and 60µm. It is coated for the 3 - 5µm spectral region, although coatings are also available for the 2 - 2.5µm and 8 - 13µm regions. Under servo-control at operating temperature the etalon has a response time of 30 msec and a minimum cavity tuning range of ±3µm about the nominal cavity length, corresponding to approximately 3 orders of interference at the midrange wavelength of 4µm.

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      Cryogenic servo-stabilized Fabry-Perot interferometers for imaging at 3-5 and 8-13 microns
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Copyright

References

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Hicks, T.R., Reay, N.K., & Scaddan, R.J., 1974, “A servo-controlled Fabry-Perot interferometer using capacitance micrometers for error detection”, J. Phys. E Sci.Instrum., vol 7, pp 2730
Hicks, T.R., Reay, N.K., Stephens, C.L., 1976, “A Servo-controlled Fabry-Perot Interferometer with On-line Computer Control”, Astron. & Astrophysics, vol 51, pp 367-374

Cryogenic servo-stabilized Fabry-Perot interferometers for imaging at 3-5 and 8-13 microns

  • N. K. Reay (a1) and K.A.R.B. Pietraszewski (a1)

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