Visible Scan Lenses
- Designed for Laser Scanning Microscopy
- Easily Incorporated into Custom-Built Microscopy Systems
- LSLM03-VIS: M25 × 0.75 External Threading
- CLS-SL: SM2 (2.035"-40) Threading on Both Ends
Thorlabs offers two scan lenses designed to work in the visible wavelength range. The LSM03-VIS scan lens for visible imaging applications has an effective focal length of 39 mm, and is optimized for the 400 - 700 nm wavelength range. The CLS-SL scan lens is ideal for point-by-point laser scanning imaging in the 400 - 750 nm wavelength range and provides an effective focal length of 70 mm and is primarily designed for laser scanning microscopy applications. The LSM03-VIS is equipped with M25 × 0.75 external threading and the CLS-SL housing offers SM2 (2.035"-40) threading on both ends, making it easy to incorporate these lenses into customized microscopy systems.
Telecentric objectives are used in OCT and other laser imaging systems because of the advantages of a flat imaging plane in applications that scan the laser across the sample being imaged. A flat imaging plane minimizes image distortion, which in turn allows for the creation of geometrically correct images without the need for extensive post image processing. A telecentric scan lens also maximizes the coupling of the light scattered or emitted from the sample (the signal) into the detection system. In addition, the spot size in the image plane is nearly constant over the entire FOV so that the resolution of the image is constant.
633 nm Visible Scan Lens
|Wavelength Range||400 - 700 nm|
|Effective Focal Length (EFL)||39 mm|
|Lens Working Distance (LWD)||25.1 mm|
|Scanning Distance (SD)|
(Distance from Pupil Position to Mounting Plane)
|Pupil Size (1/e2) (EP)||4.0 mm|
|Depth of View (DOV)||0.58 mm|
|Field of View (FOV)||10.3 x 10.3 mm|
|Parfocal Distance (PD)||50.7 mm|
|Mean Spot Size (S)|
(1/e2 Beam Diameter in the Field of Focus)
|Scan Angle (SA)||7.5°|
Visible Scan Lens for Laser Scanning Microscopy
|Wavelength Range||400 - 750 nm |
|Effective Focal Length (EFL)||70 mm|
|Lens Working Distance (LWD)||54 mm|
|Entrance Pupil Diameter||4 mm (Max)|
|Diffraction Limited Field of View*||18 mm × 18 mm @ 486 - 750 nm (FN 25.5)|
16 mm × 16 mm @ 400 - 750 nm (FN 23)
|Axial Color||<50 μm @ 400 - 750 nm|
|Field Curvature*||<700 μm@FN25|
<500 μm @FN 21
|Scanning Position||59 ± 5 mm from Mounting Plate|
|Mounting Thread||External SM2 (2.035"-40) on Both Ends|
*The Field Number (FN) is given in mm. The Field of View of the imaging system equals the FN divided by the magnification of the objective lens.
- Scanning Distance (SD): The SD is the distance between the galvo mirror pivot point and the back mounting plate of the objective. Since the LSM scan lenses are telecentric, the galvo mirror pivot point must be located at the back focal plane of the objective in order to maximize image resolution.
- Pupil Size (EP): The size of the EP determines the ideal 1/e2 collimated beam diameter that should be used for the beam of light used to image the sample in order to maximize the resolution of the imaging system. All three LSM scan lenses have an EP 4 mm in diameter.
- Working Distance (WD or LWD): The distance between the tip of the scan lens housing and the front focal plane of the scan lens is defined as the WD.
- Depth of View (DOV): The DOV parameter for the LSM03-VIS corresponds to the distance between the parallel planes on either side of the front focal plane where the beam spot diameter is √2 greater than at the front focal plane.
- Field of View (FOV): The FOV is the maximum size of the area on the sample that can be imaged with a resolution equal to or better than the stated resolution of the LSM scan lenses. In order to meet this specification the imaging system must be designed to properly utilize the LSM scan lenses in the system.
- Parafocal Distance (PD): The PD is the distance from the scan lens mounting plane to the front focal plane of the LSM scan lenses.
- Curvature (C): The curvature is the maximum distance between the front focal surface and an ideal plane.
- Scan Angle (SA): The SA is the maximum allowed angle (in the X or Y direction) between the beam and the optical axis of an LSM scan lenses after being reflected off of the galvo mirror.