AS ONE UV condensing lens
Part Number: 61-6927-51

[Features]
· A condensing lens for use with ultraviolet lasers, consisting of a synthetic quartz lens for high transmittance over the ultraviolet band.
· It has high light resistance, as it does not use glass or adhesive which absorbs ultraviolet light.
· Two or three spherical lenses are combined, and both spherical aberration and coma aberration are corrected.
· Can also be used as condensing lens for Kr* F excimer lasers (248 nm) or YAG lasers with third (355 nm) or fourth (266 nm) harmonics.
· 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.
· (NA0.25 or less for ETL)
· Separately sold protective glass can be attached to protect the objective lens from spray from laser processing.
· * 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, spherical aberration may increase and the condensing spot may widen or images may be out of focus.
· * When used outside the specified wavelength range, 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.
· * This condensing lens is not an achromatic lens.
· * Chromatic aberration is not corrected.
· * Transmission loss of about 20% occurs due to lens surface reflection (4%).
[Product Specifications]
· [ Common Specifications]
· Material: Synthetic Quartz for Excimer Laser (air gap)
· Design Wavelength: 248 nm
· Coating: Non-Coated
· Permissible Incidence Angle: ±1°
· [Individual Specifications]
· Focal distance f: 39.6 mm
· Length L: 22 mm
· NA : 0.34
· WD: 31.1 mm

Specificationtitle

• Length(mm)

  12

• Focal Length(mm)

  149.3

• WD

  144.6mm

• NA

  0.09