AS ONE UV Achromatic Focusing Lens

[Features]
·It is an achromatic condenser lens that suppresses the deviation of the focal length in the ultraviolet region (200 to 400 nm).
·It can be used for focusing on ultraviolet multi-wavelength lasers and observing ultraviolet emission images.
·With a lens with an NA of 0.1 or less, the laser collimated light can be narrowed down to the spot diameter at the diffraction limit.
·It has excellent light resistance because it does not use glass or adhesive that absorbs ultraviolet light.
· * Use a condenser lens when you want to focus an object at infinity, or when you want a point light source to be parallel ray.
· * Sufficient optical performance cannot be obtained such as when used for short-distance imaging.
· * The condenser lens has a direction to let in light.
· * Be sure to let parallel ray enter from the upper side (looking at the engraving on the side of the lens barrel upright).
· * If it is reversed, chromatic aberration and spherical aberration will increase, and the focused spot may become larger or the image may appear blurred.
· * If used outside the specified wavelength range, chromatic aberration and transmittance will deteriorate.
· * When used with a high-power laser or near a light source that produces high heat, the condenser lens becomes hot and the focal length of the condenser lens may change.
· * When irradiating for a long time, heat dissipation measures are required.
· * If you want to reduce the focusing spot diameter, widen the incident beam diameter (1/e^2) to approx. half the effective diameter of the condenser lens.
· * The surface reflection (3 to 4%) of the lens causes a transmission loss of approx. 13%.