Focusing Lens

Description

Compared to a conventional spherical lens, the most significant advantage of the aspherical lens is that it can perform spherical aberration correction. 

The aspheric lens allows the designer to correct the aberration with fewer optical lenses than the spherical lenses, so the optical system can be lower at cost and more compact in size.

Specification
Diameter Tolerance: +0/-0.13mm
Thickness Tolerance: ±0.25mm
Focal Length Tolerance: ±2%
Edge Thickness Variation (ETV): ≤ 3 arc min
Clear Aperture: >90%
Aspheric Accuracy: ≤1µm P-V
Surface Quality: 40-20 S-D
AR Coating: R<0.2% per surface @ 1030-1090nm
Material: Fused Silica, Suprasil 313, Corning 7980

Application
Laser Cutting

Description

The Glass Cylindrical Lens is used to focus an incoming beam in a single focal line than at a single focal point, it comes with both positive and negative focal lengths. Wavelength Opto-Electronics can offer customized cylindrical lenses upon request.

Specification
Diameter Tolerance: +0/-0.25mm
Thickness Tolerance: ±0.25mm
Parallelism: ≤ 10arcsec or 30 ± 5arcmin
Clear Aperture: ≥ 85% of central diameter
Surface Quality: 10–5 Scratch & Dig
AR Coating: R≤0.25% per surface @ 1064nm (Single Wavelength) | R≤0.3% @ 1064nm (Dual Wavelength)
Damage Threshold: 10J/cm², 10ns, 20Hz @ 1064nm (Single Wavelength) | 3.5J/cm², 10ns, 20Hz @ 532nm (Dual Wavelength) | 7J/cm², 10ns, 20Hz @ 1064nm (Dual Wavelength)

Description (Plano-Convex & Plano-Concave)

This series of glass focusing lenses are made of BK7 (LBK) or Fused Silica (LFS); light enters from one side and exits from the opposite side. Its purpose is to modify the wavefront curvature of the light through the lens. Then, focus the laser beam onto a very small precise spot size so that it is widely used in engraving graphic images, welding metal pieces together, or cutting various types of materials. We have different coatings and materials for different wavelengths.

Description (Air Spaced)

The purpose of developing an Air Spaced Glass Focusing Lens is to minimize aberration and achieve the smallest spot size. The achromatic triplet focusing lenses are color corrected. Both working laser beam and inspection visible beam will focus on the same focus point or two closest ones.

Description (Achromatic Cemented)

These are cemented doublet lenses for 1064nm laser, as well as colour corrected for visible wavelength. They are made up of a combination of low dispersion crown glass and high dispersion flint glass. They are suitable for laser cutting and welding applications where a vision system is equipped.

Specification
Diameter Tolerance: +0/-0.13mm
Thickness Tolerance: ±0.25mm
Focal Length Tolerance: ±2%
Edge Thickness Variation (ETV): ≤3 arc min.
Clear Aperture: >90%
Surface Flatness: λ/4 per 1″ Dia @632.8nm
Surface Quality: 40-20 S-D / 20-10 S-DAR Coating: R<0.2% per surface
Coating: Options Available | 260 – 400 nm / 400 – 700 nm / 750 – 110 nm / 1000 – 1200 nm / 1200 – 1600 nm

Application
Laser Cutting
Laser Welding

Description

Axicon focus lenses have one conical surface and are used to produce a ring focus. Typically, axicon focus lenses have a second flat surface and are used in combination with a focusing lens.

Our high-grade ZnSe Axicon lenses are made from a manufacturing process suited to the axicon angle and the accuracy required. For small angle, high accuracy lenses, the manufacturing process involves diamond-machining.

Standard Axicon lens – Axicon cone angle equal to 180°-2α

Specification
(+/-0.01 deg): α (°)
Cone Angle 140°: 20°
Cone Angle 160°: 10°
Cone Angle 165°: 7.5°
Cone Angle 170°: 5°
Cone Angle 175°: 2.5°
Cone Angle 179.5°: 0.25°= 15′

Applications
Laser Processing

Description

ZnSe Plano-Convex cylindrical focusing lens (LZCY) & Plano-Concave cylindrical focusing lens (LZCY). Cylindrical focusing lenses are either round or rectangular objects with cylindrically shaped surfaces. They differ from spherical lenses in that they focus a beam on a focal line rather than a focal point. Its applications include laser scanners, laser diode systems, spectrophotometers, projectors and optical data storage and retrieval systems.

Specification
Dimension Tolerance: +0/-0.13mm
Thickness Tolerance: ±0.25mm
Focal Length Tolerance: ±2%
Edge Thickness Variation (ETV): ≤3 arc min.
Clear Aperture: >90%
Surface Flatness: λ/4 per 1″Dia@632.8nm
Surface Quality: 60-40 S-DAR
Coating: R<0.2% per surface @10.6μm

Description

ZnSe Plano-Convex Lenses (LZ) has a positive focal length and are used to focus a collimated beam to small spot size. ZnSe Plano-Concave (LZ) lenses have a negative focal length and are used for diverging collimated beams. The curved surfaces of these lenses should face the source to minimize spherical aberration.

Positive Meniscus Convex-Concave (LZM) Lenses are converging lenses being thick at the center and thin at the edges and produce real images. The radius of the curvature of the concave side is greater than the convex side of the lens. The convex side of the lens should face the source to minimize spherical aberration. It is designed to minimize spherical aberration and produce minimum focal spot size for incoming collimated light.

Specification
Diameter Tolerance: +0/-0.13mm
Thickness Tolerance: ±0.25mm
Focal Length Tolerance: ±2%
Edge Thickness Variation (ETV): ≤3 arc min.
Clear Aperture: >90%
Surface Flatness: λ/4 per 1″ Dia@632.8nm
Surface Quality: 40-20 S-DAR
Coating: R<0.2% per surface @10.6μm

Application
Laser Cutting

Description

We provide a full range of focusing lens for varieties of Medical Laser System such as CO₂ , Q-switched ND:YAG, ER:YAG, Ruby and Alex Laser systems. These optics have been used as replacements in most well-known medical systems such as Continuum-Biomedical, ESC, Sharplan, Candela and Coherent.

Specifications
Diameter Tolerance: +0/-0.13mm
Thickness Tolerance: ±0.25mm
Focal Length Tolerance: ±2%
Edge Thickness Variation (ETV): <=3 arc min.
Clear Aperture: >90%
Surface Flatness: λ/4 per 1″Dia @632.8nm
Surface Quality: 40-20 S-DAR
Coating: R<0.2% per surface