APQ 180/1440 Fluorite Quadruplet Polychromat

The Fluorite Quadruplet Polychromat 180/1440 shows no drop in Strehl ratio toward or below the diffraction limit at the edges of the visual spectrum, unlike most apochromats.

Thanks to its polychromatic correction, the 180/1440 CaF₂ Quadruplet can utilize the full UBVRI spectral range (365 nm – 1014 nm) of modern electronic sensors (CCD, CMOS).

We source specially specified, high-quality fluorite blanks from a certified manufacturer that also supplies CaF₂ raw material to leading precision optics manufacturers for stepper lenses used in VUV photolithography.

The surfaces of the objective lenses, made from three different special optical glasses from SCHOTT^® or OHARA^® and CaF₂, are precision machined; one lens surface is aspheric.

Because every manufacturing process has finite precision, even state-of-the-art CNC machining is subject to tolerances. All manufacturing parameters must therefore be carefully specified and toleranced.

A final system correction by a master optician with decades of experience ensures the required high image quality.

A newly developed compensation cell ensures that the elements of the fully oil-spaced objective (without air gaps) remain securely positioned as temperature changes.

The optical system reaches thermal equilibrium quickly, while the cell prevents element movement and the associated adverse effects.