Ge etalon
 

Ge etalon part number #GEFPE1/0.5
Length 1.00 +/- 0.01 inch
Diameter 0.50 +/- 0.05 inch
1/4 lambda flat each end, HeNe
parallel to 3 ARC SEC or better
length measure to 0.0005"
small bevels
surface quality F-f(80/50) per MIL-F-48616

Ge etalon part number #GEFPE3/1.25
Length 3.00 +/- 0.01 inch
Diameter 1.25+/- 0.05 inch
Other specification as in #GEFPE1/05

Ge etalon part number #GEFPE20mm/1.5

Ge etalon for QCL (Quantum Cascade Laser) for 9.6 mkm
Specification:
Ge etalon has a hard  requirement for parallelism : < 2 sec.
dia 38.1 (-0.1) mm
thickness: 20 (+/-0.1) mm
Flatness: 1 fringe ( Lambda/2 at 633 nm) , delta N = 0.2 fringes
Surface quality: 60-40 s/d
Parallelism: 2 sec
Perpendicularity: 5 min

Germanium Optics>

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