microscopes, features, broadband collimators, keyvisual

RT-APO

broadband collimators for room temperature

The RT-APO series of broadband collimators is designed for use with the LT-APO cryogenic objectives, complementing the cold part of a confocal excitation/detection channel with the corresponding room temperature objective. The numerical aperture matches typical single mode fibers, and the clear aperture is the same as the one for the LT-APOs. The RT-APOs are compatible with the attoCFM I external optics head, and are by default matched to the chosen LT-APO in a complete confocal microscope. For more details, please consult the specification datasheets, or contact our sales engineers.

Objective RT-APO/VIO/0.13 RT-APO/VIS-NIR/0.13 RT-APO/VISIR-IR/0.13
compatible with.

Suitable broadband collimator for /VIO

Suitable broadband collimator for /VIS, /VISIR and /NIR Suitable broadband collimator for /VISIR, /NIR and /IR
numerical aperture (NA) 0.13 0.13 0.13
working distance 6.5 mm 6.5 mm 6.5 mm
AR coating (> 80% trasnmission) tbd 400 .. 1000 nm(5) 600 .. 1600 nm(5)
apochromatic range(3)
(δf < +/- Δ)
390 .. 550 nm 450 .. 1050 nm 680 .. 1515 nm
environments room temperature only
clear aperture 4.7 mm 4.7 mm 4.7 mm
focal length 18 mm 18 mm 18 mm
weight ~10 g ~10 g ~10 g
diameter 17.8 mm 17.8 mm 17.8 mm
length 26.2 mm 26.2 mm 26.2 mm
suitable broadband collimator n.a.
article number 1014697 1012271 1012479
download specs RT-APO/VIO/0.13 RT-APO/VIS-NIR/0.13 RT-APO/VISIR-IR/0.13

 

(1) Possible use with solid immersion lenses: half-ball radius < 0.65 (0.70) mm for unlimited lateral displacement or half-ball radius < 1.40 mm for coaxial approach only
(2) 4 options available: coating A 400-600 nm | coating B 600-1050 nm | coating C 1050-1600 nm | uncoated
(3) δf: chromatic focal shift, Δ = n*λref / (2*NA2): depth of focus, n: refractive index, λref : wavelength used to define focal plane with max. Δ
(4) glas transmission: see respective objective data sheets
(5) RT-APO: > 96% transmission

Naming Scheme

The different objectives offered are distinguished and described by the following naming scheme:

RT is short for “Room Temperature (compatible)“.
LT is short for “Low Temperature (compatible)”.
IWDO is short for “Intermediate Working Distance Objective”.
LWD is short for “Long Working Distance”.
LWDO is short for “Long Working Distance Objective”.
APO is short for “Apochromatic”, and refers to the fact that the focal displacement curve is flat (i.e. within plus/minus one depth of focus) within the specified apochromatic range (see specification sheets of the respective objectives for further details).

/VIO indicates that the objective is most suitable in the ultra-violett to visible range
/VIS indicates that the objective is most suitable for the visible wavelength range.
/VISIR indicates that the objective is most suitable for the visible to (near-)infrared wavelength range.
/IR indicates that the objective is most suitable in the lower infrared range
/NIR indicates that the objective is most suitable for the near-infrared wavelength range.
/0.82 is indicating the numerical aperture (NA) of the respective objective, in this case NA = 0.82.