
Analyzer, Testing Equipment
61-6949-31 Near Infrared Achromatic Lens Focal Length: 19.9mm DL-15-20PNIR
Product Description
Product Model: 61-6949-31Product Brand: SIGMAKOKI CO., […]
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Product Details
Product Model: 61-6949-31
Product Brand: SIGMAKOKI CO., LTD.
Features
- By combining two lenses with different refractive index wavelength dispersion into a single lens, chromatic aberration and spherical aberration can be reduced compared to a single spherical lens.
- It can be ***d as a condenser lens for near infrared LD or YAG laser (1064 nm).
- Optimization by lens design results in little change in focal length in the near infrared.
- The focal lengths of 700 nm, 880 nm, and 1100 nm match and are optimized to minimize aberration.
- Since not only chromatic aberration but also spherical aberration is well corrected, it is ideal as a collimating lens for laser.
- It is corrected not only for aberrations of the on-axis object point, but also for off-axis coma and astigmatism.
- Air gap type condensing lens (NYTL/NYDL) for laser processing is also available.
- * Use an achromatic lens when you want to focus an image at infinity or when you want to *** a point light source that is parallel to the image.
- Sufficient optical performance cannot be obtained when the camera is ***d for close-range imaging.
- * The chromatic lens has an orientation that allows parallel light to enter the lens.
- * This function allows parallel light to enter from the side of the face with a small radius of curvature (the face pointed to by the arrow).
- * When parallel light is incident from the opposite side, chromatic aberration and spherical aberration occur, and the condensing spot becomes larger.
- Chromatic aberration and spherical aberration increase when the camera is ***d in the visible range. Also, the transparency may be poor.
Spec
-
[
common specification]
- Material: N-LAK22/SF6
- Design wavelength: 700nm 880nm 1100nm
- Coating: Multi-layered reflective prevention film (700 - 1550nm)
- Adhesive: Ultraviolet curing type adhesive
- Laser durability: 0.3J/cm2
- Scratch - dig: 40-20
- Effective diameter: 90% of the outer diameter
- [Individual specification]
- Outer diameter φD: φ15mm
- Focal length f: 19.9mm
- Center thickness tc: 9.5mm
- Edge thickness te: 6.6mm
- Back focus fb: 14.7mm
- Eccentricity: < 3′
- RoHS conform product
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