NUDL-40-250P Condenser Lens

[Features]
· An achromatic condensing lens which minimizes the shift in the focal length over the ultraviolet region (200-400 nm).
· It can be used for condensing light from multi wavelength lasers in the ultraviolet range, and for observation of ultraviolet luminescence images.
· For lenses with an NA of 0.1 or less, laser collimated light can be roughly narrowed to the spot diameter of the diffraction limit.
· It has high light resistance, as it does not use glass or adhesive which absorbs ultraviolet light.
· * Use condensing lenses when imaging an object with infinite distance as the focus or changing the positional light source to parallel light.
· * Sufficient optical performance cannot be obtained when used for imaging at a close distance, etc.
· * The condensing lens has an orientation for light incidence.
· * Be sure to have parallel light incident from the top (with the engraved stamp on the lens barrel upright).
· * When reversed, chromatic or spherical aberration may increase and the condensing spot may widen or images may be out of focus.
· * When used outside the specified wavelength range, chromatic aberration and transmittance will worsen.
· * The condensing lens may become very hot and the condensing lens focal distance may vary if a high-power laser is used or the product is used near a light source generating intense heat.
· * Heat dissipation measures are required if irradiating for long periods.
· * If a smaller spotting diameter is desired, widen the incident beam diameter (1/e^2) to approximately half of the effective diameter of the condensing lens.
· * Transmission loss of about 13% occurs due to lens surface reflection (3 to 4%).
[Product Specifications]
· [ Common Specifications]
· Material: Synthetic Quartz for Excimer Laser (air gap) CaF2 for Ultraviolet
· Design Wavelength: 200 nm, 308 nm, 400 nm
· Coating: Non-Coated
· Permissible Incidence Angle: ±1°
· [Individual Specifications]
· Focal distance f: 249.7 mm
· Outer diameter φDc: φ44 mm
· Effective Diameter φDe: φ37 mm
· Length L: 19 mm
· NA : 0.07
· WD : 230.7 mm