功能

• It is a condensing lens for ultraviolet lasers composed of a synthetic quartz lens with high transmittance in the ultraviolet region.
• No glass or adhesive absorbs ultraviolet light, so it has excellent light resistance.
• Two or three spherical lenses are combined to correct for spherical and coma aberration.
• It can also be used as a condenser lens for Kr* F excimer laser (248 nm), 4 times wave (266 nm) and 3 times wave (355 nm) of YAG laser.
• With a lens of NA0.1 or less, the laser collimated light can be narrowed down to a spot diameter that is almost diffraction limited.
• (NA 0.25 or less for ETL)
• Protective glass, sold separately, can be installed to protect the lens from flying light caused by laser processing.
• * Use the condenser lens when you want to focus an object at infinity, or when you want to use the point light source as parallel light.
• Sufficient optical performance cannot be obtained when the camera is used for close-range imaging.
• * The condenser lens has an orientation that allows light to enter.
• * Be sure to allow parallel light to enter from the upper side (look at the engraving on the side of the lens barrel upright).
• * Doing the reverse operation will cause the spherical aberration to increase, which can cause the focus spot to increase and can cause blurred images.
• Aberration and transmittance will be reduced if the camera is used outside the specified wavelength range.
• * When using with a high power laser or near a high heat source, the focusing lens may become hot and the focal length of the focusing lens may change.
• * Heat dissipation measures are necessary when irradiating for a long time.
• * If you want to reduce the condensing spot diameter, widen the incident beam diameter (1/e^2) to about half the effective diameter of the condensing lens.
• * This condenser lens is not an achromatic lens.
• Chromatic aberration is not corrected.
• Surface reflection (4%) of the lens causes a transmission loss of about 20%.