Fabry-Perot Characteristics

Updated 6 Jun 2021, C. Briceno

This page contains information about the two Fabry-Perot units used in the SAM-FP mode. (Note that the Fabry-Perot module in SAM is not currently available).

Low-Resolution Fabry-Perot (LRFP)

Table 1 - LRFP in numbers
Normal gap size 44 μm
Nominal order for Ha 134
Nominal Free-Spectral-Range - 48.95 Å 2236 km.s-1
Free-Spectral-Range 345.99 ± 0.14 bcv - -
Sampling 0.1415 Å.bcv-1
Finesse 41.72
Number of channels 84
Full-width at half-maximum 8.29 ± 0.1 bcv 1.17 ± 0.01 Å 53.4 ± 0.45 km.s-1

High-Resolution Fabry-Perot (HRFP)

Table 2 - HRFP in numbers
Normal gap size 200 μm
Nominal order for Ha 609.48
Nominal Free-Spectral-Range - 10.77 Å 491.96 km.s-1
Free-Spectral-Range 350.24 bcv - -
Sampling 0.0308 Å.bcv-1
Finesse 16.45
Number of channels 36
Full-width at half-maximum 21.29 ± 1.28 bcv 0.655 ± 0.039 Å 29.81 ± 1.80 km.s-1