Description
General Introduction: Raytek N-bk7 biconcave lens can be coated with either non coating or multi-layer antireflective coating. All lenses are guaranteed λ/4 surface accuracy and 40-20 scratch-dig surface quality. N-bk7 is an excellent lens material for most visible and near infrared applications. It has high homogeneity, low content of bubbles and inclusions, simple and direct manufacture, and can provide excellent performance with economic cost.
Products Name: N-BK7 Bi-Concave Lenses
Alias: N-BK7 Bi-concave Lenses,N-BK7 Bi-concave Lenses, Optical Concave lens, N-BK7 optical concave lens, Visible N-BK7 Bi-concave Lens, Visible Bi-concave lens, IR Bi-concave lens, NIR Bi-concave lens, 1064nm Bi-concave lens, Uncoated Bi-concave lens,Double concave lens,etc
Lens Substrates:
N-BK7
Coating Type:
Main Applying:
Main Characters:
1).High performance 40-20 scratch-dig N-BK7 substrates
2).Double-Concave shape for beam expansion applications
3).Standardized focal lengths across different lens sizes
Products Highlights:
1).Different grades materials for option.
2).High precision & high surface roughness;
3).Sizes can be customized as per the customers' request
4).Quick lead time and delivery time.
5).Matching super optics custom and processing capacity, including Moulding, CNC machining, Polishing, Particle beam processing, Magnetic flux conversion processing, Grinding, Coating, Lightweighting, Custom Shaping, Counterbores, Drilling & Coring, Edge & Bevel Polishing,3D Contouring, Bevels & Chamfers, Steps & Slots, Laser Cutting & Marking, Metrology & Inspection, Precision Pitch Polishing, Double-Sided Polishing, Optical Assembly, Measuring, etc.
6).Excellent post-sale quality warranty, with "3R"-return, replace & refund policy
Main Optical Tech Specification:
Popular Physical Size Specification:
Main Cooperation Materials Manufacturers:
CORNING, OHARA, SCHOTT, LEONI, AGC,HELLMA, NIKON,VITRON,C-LASER,ETC
Main Export Countries & Areas:
Products Name: N-BK7 Bi-Concave Lenses
Alias: N-BK7 Bi-concave Lenses,N-BK7 Bi-concave Lenses, Optical Concave lens, N-BK7 optical concave lens, Visible N-BK7 Bi-concave Lens, Visible Bi-concave lens, IR Bi-concave lens, NIR Bi-concave lens, 1064nm Bi-concave lens, Uncoated Bi-concave lens,Double concave lens,etc
Lens Substrates:
N-BK7
| Optional I: |
N-BK7 from CORNING, OHARA, SCHOTT, LEONI, AGC,HELLMA, NIKON,VITRON,ETC |
| Optional II: |
Equivalent N-BK7 Made in China, C-laser own brands |
Coating Type:
| Coating Code: | Coating Type | Wavelength Range |
| AR.14 | Visible Multilayer | 430-700 nm |
| AR.16 | NIR Multilayer | 650-1000 nm |
| AR.18 | IR Multilayer | 1000-1550 nm |
| AR.33 | Laser Line V-Coat Multilayer | 1064 nm |
| - | Uncoated | - |
Main Applying:
| Applying Fields I: |
Negative lens Imaging lens Beam expander lens Beam collimating lens Divergent collimated beam Collimating divergent beam |
| Applying Fields II: |
Laser beam expansion Optical reader Observer Projection system |
| ***** |
|
Main Characters:
1).High performance 40-20 scratch-dig N-BK7 substrates
2).Double-Concave shape for beam expansion applications
3).Standardized focal lengths across different lens sizes
Products Highlights:
1).Different grades materials for option.
2).High precision & high surface roughness;
3).Sizes can be customized as per the customers' request
4).Quick lead time and delivery time.
5).Matching super optics custom and processing capacity, including Moulding, CNC machining, Polishing, Particle beam processing, Magnetic flux conversion processing, Grinding, Coating, Lightweighting, Custom Shaping, Counterbores, Drilling & Coring, Edge & Bevel Polishing,3D Contouring, Bevels & Chamfers, Steps & Slots, Laser Cutting & Marking, Metrology & Inspection, Precision Pitch Polishing, Double-Sided Polishing, Optical Assembly, Measuring, etc.
6).Excellent post-sale quality warranty, with "3R"-return, replace & refund policy
Main Optical Tech Specification:
| Tech Data | Description |
| Lens Shape | Bi-Concave (Double Concave) |
| Material | N-BK7 |
| Surface Quality | 40-20 scratch-dig |
| Surface Flatness | λ/4 |
| Surface Accuracy, Irregularity | λ/4 |
| Surface Accuracy, Power | 1.5 λ |
| Centration | ≤3 arc min |
| Chamfers | 0-0.8 mm face width |
| Chamfers Angle Tolerance | 45° ±15°, typical |
| Focal Length Tolerance | ±1 % |
| Clear Aperture | ≥central 90% of diameter |
| Effective Focal Length(EFL) | From -12.5mm to -500mm |
Popular Physical Size Specification:
| Size |
6.35mm/12.70mm/25.40mm/50.8mm,or Design & custom manufacturing as per demand. |
| Size Tolerance | +0/-0.1 mm |
| Thickness | - |
| Thickness Tolerance | - |
Main Cooperation Materials Manufacturers:
CORNING, OHARA, SCHOTT, LEONI, AGC,HELLMA, NIKON,VITRON,C-LASER,ETC
Main Export Countries & Areas:
Usa, Uk, Japan, Germany, Spain, France, Swiss, Korea, Russia, Pakistan, India, Portugal, Canada, New Zealand, Australia, Saudi Arab, Turkey, Finland, Poland ,etc.
Raytekoptics Extra value added services offered:
1). Optical workcraft & process solution design;
2). Rough processing raw materials;
3). Semi finishing raw materials;
4). Fabricate custom sizes and shapes;
5). Design and supply custom coatings;
6). Modify and resurface customer supplied materials;
7). Drill holes, notch glass and provide beveled substrates;
8). Precision polish optics with non-standard aspect ratios;
Payment Method: by T/T or Western Union.
Delivery time: 7-10 days.
Quality Warranty: Ruitaiphotoelectric(Raytekoptics) offers quality warranty for our optics products with "3R" policy. For any inferior-quality products, Ruitaiphotoelectric(Raytekoptics) is responsible for return, replacement and refund.
