Representative image. Final geometry, finish and coating are confirmed from your drawing.
Reference · TO-PCX-NBK7
N-BK7 Plano-Convex Lens
Lenses
A single-element positive lens for focusing or collimating light, supplied in N-BK7, H-K9L or UV fused silica to your drawing.
Typical values
| Parameter | Reference |
|---|---|
| Material | N-BK7 / H-K9L |
| Diameter | Ø2–150 mm standard; Ø150–300 mm by review |
| Focal length | Positive; to drawing |
| EFL tolerance | ±2% |
| Center thickness | To drawing |
| Thickness tolerance | ±0.015–0.03 mm by diameter |
| Surface figure | λ/2 standard; λ/4–λ/10 by review |
| Surface quality | 40/20 standard; 20/10–10/5 by review |
| Centration | ≤30 arcsec for Ø10–150 mm |
| Clear aperture | >90% |
| Chamfer | <0.2 × 45° |
| Coating | AR / BBAR / V-coat; per drawing |
Use this table to understand what is routine, what is reviewed against a drawing and where the project needs a different route.
| Parameter | Standard | By drawing review | Notes |
|---|---|---|---|
| Material | N-BK7 / H-K9L optical glass | UV fused silica, H-BAK7, sapphire and other optical glasses | Final material grade is confirmed against the drawing and wavelength band. |
| Diameter | Ø2–150 mm | Ø150–300 mm | Smaller or larger diameters are quoted after drawing review. |
| Focal length | ±5–1000 mm, ±2% | Outside this range; tighter EFL tolerance | — |
| Surface figure | λ/2 @ 632.8 nm | λ/4 to λ/10 @ 632.8 nm | Test condition and clear aperture must be stated on the drawing. |
| Surface quality | 40/20 scratch-dig | 20/10 to 10/5 scratch-dig | — |
| Centration | ≤30 arcsec for Ø10–150 mm | Tighter than 30 arcsec; small-diameter parts by review | — |
| Clear aperture | >90% of diameter | Per drawing | — |
| Coating | AR / BBAR, V-coat, metal | Laser-line, UV, broadband or durability-specific designs | Coating curve, AOI and environmental exposure are required for review. |
The plano-convex form is the usual choice when one conjugate is close to infinity: the curved surface faces the collimated beam and the plano surface faces the focus. We review diameter, EFL, edge thickness and coating before quoting, and can match the inspection plan to the application.
- Laser focusing and collimation
- Imaging and illumination
- Laboratory prototypes
- Positive focal length
- AR / BBAR coating options
- Custom diameter and EFL
- Protective chamfer
What to include in the RFQ
The following inputs let us quote the geometry, coating and inspection route without guessing.
Request a quote for this component- 01Optical drawing with diameter, EFL or radius, center thickness and tolerances
- 02Substrate grade and wavelength band
- 03Surface figure, surface quality and centration requirements
- 04Coating curve, AOI, polarization and durability requirements
- 05Prototype and annual quantity
- 06Required inspection documents
TO-BCX-NBK7
N-BK7 Biconvex Lens
A symmetric positive lens for imaging, relay and focusing where both conjugates are finite or the layout needs a compact element.
View specification
TO-PCV-NBK7
N-BK7 Plano-Concave Lens
A single-element negative lens for beam expansion, divergence and compensating optical power in a compact layout.
View specification
TO-BCV-NBK7
N-BK7 Biconcave Lens
A symmetric negative lens for beam expansion, divergence and balancing positive elements in imaging or laser systems.
View specification