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LENSES
Longman Optical produces a broad range of precision grade lenses with outstanding specifications. They are made of the best grade material of BK7 optical class, fused silica, sapphire, high index flint glass. The lenses are widely used in the optical industry and have various functions. They can be used for the simple collection of light, the scanning of laser beams, precise imaging and image transfer. Simple lens elements can work either singly or in combination with others. Some of our lenses are customer OEM. We are very competitve both in producing small quantity and large volume customer OEM lenses.
Achromatic Doublets
Achromatic doublet lenses (“achromat”) are designed to eliminate chromatic and spherical aberrations inherent in singlet lenses. When used on-axis, an achromatic lens focuses an parallel input beam to a perfect “point”, imited only by the effects of diffraction. This performance can be achieved over a broadband of wavelength. Achromatic lenses can be used to collimate and focus laser beams. They can also be used for high-quality imaging on-axis. However, the off-axis performance is significantly.
Achromatic Doublets
Manufacture aspherical lenses from most available optical glass materials. We have competitive pricing for custom aspherical lenses in prototype or large quantities.
Ball Lenses
Ball lenses are used for light coupling in fiber-optic applications. The choice of the optical ball lens depends on various parameters such as the diameter of the laser beam, the numerical aperture of the fiber and the wavelength of the light. We put out these ball lenses from optical glasses to provide a high coupling efficiency when used with fiber optics. They are simple to use as they can be put in contact with the end of the fiber.
Cylindrical Lenses
Cylindrical lenses are available in either plano-concave or plano-convex configurations. Plano-concave lenses have a negative focal length and are used for image reduction or to spread light. Plano-convex lenses have a positive focal length, which makes them ideal for collecting and focusing light for many imaging applications.
CCD Lenses
Made to customer specifications.
Rod Lenses
Rod Lenses are polished on the circumference and ground on both ends. Optical performance is similar to a cylinder lens, made to customer specifications.
Fused Silica and Fused Quartz
Transmission Range: 185-2500nm Refractive Index: 1.4858@308nm Low Thermal Expansion Coefficient: 0.54 x 10-6K Better performance from UV to IR spectrum. Also, it is the best choice for resistance thermal application.
Meniscus Glass Lenses
We can manufacture a wide range of diameters and focal lengths, 1 mm to 300 mm. Lenses can be shaped to your particular requirement. We can provide them mounted or unmounted with standard or custom metal mounts. Plano-convex lenses Bi-concave lenses Bi-convex lenses Bi-concave lenses Meniscus (positive or negative)
Plano-Concave Glass Lenses
A lens is an optical device with perfect or approximate axial symmetry which transmits and refracts light, concentrating or diverging the beam. A simple lens is a lens consisting of a single optical element.
Plano-Convex Glass Lenses
This kind of lens has positive focal lengths. They work best when producing real images at near infinite conjugates or where one of the conjugates is virtual. Our optical designers are always available to assist with your special needs large or small quantity requirements.
Triplet Achromats
We can supply air spaced or cemented triplets to customer specifications. Please enquire about our capabilities to manufacture these components.
Sapphire Lenses
With >98% transmission with AR coatings on both sides @ 2.94 µm and 2.1 µm, Sapphire Lenses have surface figures to 1/8 wave, supplied to customers specifications.