Magnesium Fluoride Plano-Convex Lenses, Uncoated
![](https://www.thorlabs.com/Images/GuideImages/901_MgF2PlanCon_4.jpg)
- Wavelength Range: 200 nm - 6 µm Uncoated
- Average Transmission >90% from 200 nm to 6 µm
- Extremely Durable and Rugged in the UV to the IR
LA6002
LA6004 Lens Shown Mounted
in an LMR1 Fixed Lens Mount
![](../../images/loading-red.gif)
Please Wait
Specifications | |
---|---|
Material | Vacuum-Grade Magnesium Fluoride |
Wavelength Range | 200 nm - 6 μm |
Diameter Tolerance | +0.00/-0.10 mm |
Thickness Tolerance | ±0.2 mm |
Focal Length Tolerance | ±2% at 633 nm |
Surface Quality | 40-20 Scratch-Dig |
Surface Flatness (Plano Side) |
λ/2 |
Spherical Surface Powera (Convex Side) |
3λ/2 |
Surface Irregularity (Peak to Valley) |
λ/4 |
Centration | ≤3 arcmin |
Clear Aperture | >90% of Diameter |
Alignment of C-Axis | <20 armin |
Index of Refraction | 1.376981 @ 630 nm |
Coating | None |
![]() |
---|
Click on the red Document icon next to the item numbers below to access the Zemax file download. Our entire Zemax Catalog is also available. |
Features
- Wavelength Range: 200 nm - 6.0 μm
- Material: Vacuum-Grade MgF2
Thorlabs' MgF2 Plano-Convex lenses are popular for many applications in the UV and IR. These lenses are an ideal choice for applications from 200 nm to 6.0 μm. Magnesium Fluoride is extremely durable in comparison to other materials that reach this far down into the UV or out into the IR. The C-axis is oriented to minimize birefringence.
Plano-Convex lenses have a positive focal length and approach best form for infinite and finite conjugate applications. These lenses focus a collimated beam to the back focus and collimate light from a point source. They are designed with minimal spherical aberration and have a focal length which can be calculated using a simplified thick lens equation:
f= R/(n-1),
where n is the index of refraction and R is the radius of curvature of the lens surface. To minimize the introduction of spherical aberration, a collimated light source should be incident on the curved surface of the lens when being focused and a point light source should be incident on the planar surface when being collimated.
Plano-Convex Lens kits are also available - please click here for information.
Selection Guide |
---|
Magnesium Fluoride Lenses |
Other MIR Lenses |
Other Spherical Singlets |
Transmission Curve for Magnesium Fluoride: 10 mm Thick Uncoated Sample, Surface Reflections are Included in the Transmission Plot
Click to Enlarge
Click here for raw data.
Recommended Mounting Options for Thorlabs Lenses | ||
---|---|---|
Item # | Mounts for Ø2 mm to Ø10 mm Optics | |
Imperial | Metric | |
(Various) | Fixed Lens Mounts and Mini-Series Fixed Lens Mounts for Small Optics, Ø5 mm to Ø10 mm | |
(Various) | Small Optic Adapters for Use with Standard Fixed Lens Mounts, Ø2 mm to Ø10 mm | |
Item # | Mounts for Ø1/2" (Ø12.7 mm) Optics | |
Imperial | Metric | |
LMR05 | LMR05/M | Fixed Lens Mount for Ø1/2" Optics |
MLH05 | MLH05/M | Mini-Series Fixed Lens Mount for Ø1/2" Optics |
LM05XY | LM05XY/M | Translating Lens Mount for Ø1/2" Optics |
SCP05 | 16 mm Cage System, XY Translation Mount for Ø1/2" Optics | |
(Various) | Ø1/2" Lens Tubes, Optional SM05RRC Retaining Ring for High-Curvature Lenses (See Below) |
|
Item # | Mounts for Ø1" (Ø25.4 mm) Optics | |
Imperial | Metric | |
LMR1 | LMR1/M | Fixed Lens Mount for Ø1" Optics |
LM1XY | LM1XY/M | Translating Lens Mount for Ø1" Optics |
ST1XY-S | ST1XY-S/M | Translating Lens Mount with Micrometer Drives (Other Drives Available) |
CXY1A | 30 mm Cage System, XY Translation Mount for Ø1" Optics | |
(Various) | Ø1" Lens Tubes, Optional SM1RRC Retaining Ring for High-Curvature Lenses (See Below) |
|
Item # | Mount for Ø1.5" Optics | |
Imperial | Metric | |
LMR1.5 | LMR1.5/M | Fixed Lens Mount for Ø1.5" Optics |
(Various) | Ø1.5" Lens Tubes, Optional SM1.5RR Retaining Ring for Ø1.5" Lens Tubes and Mounts |
|
Item # | Mounts for Ø2" (Ø50.8 mm) Optics | |
Imperial | Metric | |
LMR2 | LMR2/M | Fixed Lens Mount for Ø2" Optics |
LM2XY | LM2XY/M | Translating Lens Mount for Ø2" Optics |
CXY2 | 60 mm Cage System, XY Translation Mount for Ø2" Optics |
|
(Various) | Ø2" Lens Tubes, Optional SM2RRC Retaining Ring for High-Curvature Lenses (See Below) |
|
Item # | Adjustable Optic Mounts | |
Imperial | Metric | |
LH1 | LH1/M | Adjustable Mount for Ø0.28" (Ø7.1 mm) to Ø1.80" (Ø45.7 mm) Optics |
LH2 | LH2/M | Adjustable Mount for Ø0.77" (Ø19.6 mm) to Ø2.28" (Ø57.9 mm) Optics |
VG100 | VG100/M | Adjustable Clamp for Ø0.5" (Ø13 mm) to Ø3.5" (Ø89 mm) Optics |
SCL03 | SCL03/M | Self-Centering Mount for Ø0.15" (Ø3.8 mm) to Ø1.77" (Ø45.0 mm) Optics |
SCL04 | SCL04/M | Self-Centering Mount for Ø0.15" (Ø3.8 mm) to Ø3.00" (Ø76.2 mm) Optics |
LH160C | LH160C/M | Adjustable Mount for 60 mm Cage Systems, Ø0.50" (Ø13 mm) to Ø2.00" (Ø50.8 mm) Optics |
SCL60CA | SCL60C/M | Self-Centering Mount for 60 mm Cage Systems, Ø0.15" (Ø3.8 mm) to Ø1.77" (Ø45.0 mm) Optics |
Mounting High-Curvature Optics
Thorlabs' retaining rings are used to secure unmounted optics within lens tubes or optic mounts. These rings are secured in position using a compatible spanner wrench. For flat or low-curvature optics, standard retaining rings manufactured from anodized aluminum are available from Ø5 mm to Ø4". For high-curvature optics, extra-thick retaining rings are available in Ø1/2", Ø1", and Ø2" sizes.
Extra-thick retaining rings offer several features that aid in mounting high-curvature optics such as aspheric lenses, short-focal-length plano-convex lenses, and condenser lenses. As shown in the animation to the right, the guide flange of the spanner wrench will collide with the surface of high-curvature lenses when using a standard retaining ring, potentially scratching the optic. This contact also creates a gap between the spanner wrench and retaining ring, preventing the ring from tightening correctly. Extra-thick retaining rings provide the necessary clearance for the spanner wrench to secure the lens without coming into contact with the optic surface.
Posted Comments: | |
user
 (posted 2022-03-09 05:24:30.2) MgF2 window (WG61050) is specified to be transmissive (>50%) at 120nm. Is it also the case for these lenses? jgreschler
 (posted 2022-03-10 03:33:39.0) Thank you for reaching out to Thorlabs. Yes the window and the lens share a substrate and will share a transmission curve. We have more information about our optical substrates here https://www.thorlabs.us/newgrouppage9.cfm?objectgroup_id=6973&tabname=magnesiumfluoride Lawrence Trask
 (posted 2021-09-01 15:32:37.847) Greetings, our group is interested in focusing 2 um light into a PPLN. Is it possible to make an MgF2 lens with a different focal length? For example, one with a focal length of 120 mm? YLohia
 (posted 2021-09-03 08:31:40.0) Hello, custom optics can be requested by emailing techsales@thorlabs.com. We will discuss the possibility of offering this customization directly. christian.zimmermann
 (posted 2016-08-05 11:17:53.79) Hei,
can you tell me, if the MgF2 lenses can be used for low Temperature applications (down to ca. 30 K)?
Best regards,
Christian Zimmermann |
![Back to Top Back to Top](https://www.thorlabs.com/images/arrow_Vert.gif)