Drum Lenses, D=4.00mm, F=3.98mm, Uncoated UV Fused Silica, United Optical Technology Co., Ltd (CAT#: STEM-OP-2690-YJL)

Drum Lenses, D=4.00mm, F=3.98mm, Uncoated UV Fused Silica, model 165023, is manufactured by United Optical Technology Co., Ltd.
A drum lens has a shorter focal length and greater magnification than an ordinary convex lens. Its focal length depends on the refractive index of the material itself. UV fused silica glass material has a wider spectral range (185nm-2.1μm) than K9 optical glass, and has excellent transmittance in the ultraviolet band. It has a lower refractive index, better uniformity, and a smaller thermal expansion coefficient. It also has higher chemical resistance and very low fluorescence, and can be used to make various optical components.

Diameter: 4.00mm
EFL: 3.98mm
Coating: Uncoated
Material: UV-Grade Fused Silica
BFL: 1.48mm
Center Thickness CT: 5.00mm
Design Wavelength: 587.6nm
Diameter Tolerance: +0.0/-0.05mm
Center Thickness Tolerance: ±0.005mm
Surface Accuracy: λ/4@632.8nm
Surface Quality: 40/20-60/40
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UV Fused Silica Drum Lenses are lenses with spherical ends that provide positioning surfaces along the optical axis. It is formed by grinding the outer circle on the basis of a ball lens for the convenience of card installation. It is more suitable for the propagation of light in optical communications.

Drum Lenses, D=5.00mm, F=6.36mm, Uncoated UV Fused Silica, United Optical Technology Co., Ltd (CAT#: STEM-OP-2691-YJL)
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Drum Lenses, D=3.00mm, F=3.18mm, UV UV Fused Silica, United Optical Technology Co., Ltd (CAT#: STEM-OP-2694-YJL)
Drum Lenses, D=4.00mm, F=3.98mm, UV UV Fused Silica, United Optical Technology Co., Ltd (CAT#: STEM-OP-2695-YJL)
Drum Lenses, D=5.00mm, F=6.36mm, UV UV Fused Silica, United Optical Technology Co., Ltd (CAT#: STEM-OP-2696-YJL)