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 | 1021856 |
| 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.