61-6921-52 Achromatic Doublets φ50mm Focal Length 451.5mm DLB-50-450PM
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 used as a telescope objective lens or a collimating lens for laser experiments.
- Optimization by lens design results in little change in focal length across the visible range.
- Since not only chromatic aberration but also spherical aberration are 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.
- It can be used for imaging systems such as telescope objective lenses and microscope imaging lenses.
- It can be selected according to your specifications from a wide range of variations, subdivided by outer diameter size and focal length.
- 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 use a point light source that is parallel to the image.
- Sufficient optical performance cannot be obtained when the camera is used 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 may increase when the camera is used at wavelengths other than visible light.
- * Also, transparency may be reduced.
Spec
- [
common specification] - Design wavelength: Blue: 486.1nm, Green: 546.1nm, Red: 656.3nm
- Coating: Reflective prevention film
- Material: BK7, SF2
- Adhesive: Ultraviolet curing type adhesive
- Laser durability: 0.3J/cm2 (pulse width 10ns, Repeat frequency 20Hz)
- Scratch - dig: 40?20
- Effective diameter: 90% of the outer diameter
- [Individual specification]
- Outer diameter φD: φ50mm
- Focus distance f: 451.5mm
- Edge thickness te: 8.3mm
- Center thickness tc: 9.9mm
- Back focus fb: 446.2mm
- Eccentricity: ＜1′
- RoHS conform product
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61-6921-52 Achromatic Doublets φ50mm Focal Length 451.5mm DLB-50-450PM特徴
仕様
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