FTL-f32.5mm
mounted focusing TPX lens with focal length 32.5 mm
Description
FTL-f30mm is a mounted TPX (Polymethylpentene) lens. It is used in combination with CTL-D25mm or CTLF-D25mm to focus the terahertz radiation emitted by a photoconductive antenna (PCA). The collimated THz beam of a photoconductive emitter antenna with a collimating TPX lens (CTL-D25mm or CTLF-D25mm) is focused using the mounted TPX lens FTL-f32.5mm. The focal length is 32.5 mm.
Focusing TPX lens
material
TPX (Polymethylpentene)
refractive index n
1.45 @ 1 THz
absorption coeff. a
0.3 cm-1
diameter
25.4 mm
thickness
8.0 mm
back focal length
32.5 mm
Focused THz beam
aperture angle a
17.6°
Airy disc diameter
at 300 GHz
1.9 mm
at 1 THz
554 µm
at 3 THz
185 µm
Lens Tube
outer diameter
30.5 mm
total length
16.5 mm
Compatible PCAs
The FTL-f32.5mm can be used with both CTL-D25mm and CTLF-D25mm.
Fig. 2: FTL-f32.5mm in combination with CTLF-D25mm mounted with SMR1
Fig. 3: Schematic section view of FTL-f30mm and CTL-D25mm together with a mounted FC-PCA
Recommended mounting options The lens tube’s SM1 thread allows FTL-f32.5mm to be attached to BATOP’s collimating mounted terahertz lenses (CTL-D25mm and CTLF-D25mm). Together they can be mounted with Thorlabs’ SMR1.
Fig. 4: Mounting option: FTL-f32.5mm and CTL-D25mm mounted with SMR1
描述 [描述] mounted focusing TPX lens with focal length 32.5 mm