Bote Optics produces various high damage threshold lenses, including plano-convex, biconvex, plano-concave, biconcave, meniscus, etc. according to the surface shape of the lens. The functions of lenses in optical systems are divided into three types: focusing, coupling, and collimation.
Focusing lens: Focusing lens is widely used in laser processing (such as cutting, marking, welding, engraving, etc.) and various laser systems.
Coupling lens: If a beam of laser wants to be propagated through an optical fiber, the laser beam must be collimated through a lens and focused into the optical fiber.
Collimating lenses: used in beam delivery systems to maintain beam collimation between the laser resonator and focusing optics. It is widely used in laser processing fields such as laser marking machines, laser cutting machines, laser welding machines, fiber cutting machines, and handheld welding machines.
Main technical parameters:
| Materials | K9/silica | Dimension Tolerance | +0.1/-0.1mm |
| Thickness Tolerance | ±0.1mm | Focal length tolerance | ±2%@1064nm |
| Surface smoothness | 40/20 | Facial shape | λ/[email protected] |
| Clear Aperture | >90% | Parallelism | £1’ |
| Coating | dielectric film | Lateral | <0.2×45° |
Specifications:
| Diameter(mm) | Focal Length(mm) | Facial shape | Laser wavelength (nm) |
| 18 | 55/80/150 | Bi-convex | 1050-1080 |
| 20 | 30/35/40/50/60/70/80/100/120/150/200 | Plano convex/biconvex | 1050-1080 |
| 25 | 70/100/120/150 | Plano convex/biconvex | 1050-1080 |
| 15.4 | 70/100/120/150 | Plano convex/biconvex | 1050-1080 |
| 28 | 80/120 | Plano convex | 1064 |
| 30 | 40/50/60/70/75/90/100/120/150/200/250/300 | Plano convex/biconvex/meniscus | 1064/694.3 |
| 36 | 55/70/80/100/120/150/180/220 | Plano convex/biconvex/meniscus | 1064/915/980 |
| 40 | 100/120/150/180/300 | Plano convex/biconvex/meniscus | 1050-1080 |
| 41.5 | 80/100/120/150/180 | biconvex/meniscus | 1050-1080 |
| 42 | 80/120/200 | biconvex/meniscus | 1050-1080 |
| 50 | 100/120/150/180/200 | biconvex/meniscus | 1050-1080 |
| 50.8 | 150/250 | Plano convex/biconvex | 1050-1080 |
| 12.7 | -15/-30/-47/-70 | Plano concave | 1050-1080 |
| 16 | -20/-30/-37/-47/-70 | Plano concave/biconcave | 1050-1080 |
| 20 | -30/-100 | Plano concave | 1050-1080 |
The benefits of fixed focus lenses are mainly reflected in the use of short focal lengths:
⒈Fixed wide-angle or standard lenses generally have larger diameters than zoom lenses covering the corresponding focal length range. The aperture of general fixed-focus wide-angle and medium-focus lenses is above 2.8, which allows a large amount of light and is convenient for shooting in low-illumination situations.
⒉ Fixed-focus wide-angle lenses generally have a shorter focusing distance than zoom lenses covering the corresponding focal length range. For example, the shortest focusing distance of EF17-35 is 0.42m, while the shortest focusing distance of EF20/2.8, EF24/1.4, EF28/1.8, and EF35/2 is all 0.25m. There are many benefits to having a short minimum focusing distance, especially for wide-angle lenses. A short focusing distance means that you can get very close to the subject and get a large image. And combined with their large apertures, they can achieve wide-angle background blur effects that are not easily achieved with zoom wide-angle lenses.
⒊Fixed wide-angle lenses are generally smaller and lighter than zoom lenses covering the corresponding focal length range. This will make your camera less glaring and easier to capture.
⒋Wide-angle fixed-focus lenses generally have better imaging in the wide-angle segment than zoom lenses. This is determined by the design of the lens. Since zoom lenses must consider relatively good imaging in all focal length segments, they must sacrifice local interests to achieve a better overall image. Relatively good performance. But you don’t have to worry about this with fixed-focus lenses.