Kunshan Nuoli Optical Branch: How to choose the optical glass lens that suits you?

Choosing an optical glass lens that suits you needs to consider many factors. The following are some suggestions:

Clear use requirements and purposes:

Imaging requirements:

If it is used for optical imaging, such as photography and microscopic imaging, it requires high imaging quality, so it is necessary to choose a lens with good aberration correction and high resolution. For example, in professional photography, high-quality convex lens can ensure clear and sharp photos; In microscope, the lens quality of objective lens and eyepiece directly affects the observation clarity of tiny objects. Usually, lenses with uniform refractive index and low dispersion are selected to ensure the color accuracy and clarity of imaging.

If there are specific requirements for enlargement or reduction of imaging, the lens with appropriate focal length should be selected according to the required magnification or reduction ratio. For example, if a larger magnification is needed, a convex lens with a shorter focal length can be selected; If the imaging is only slightly enlarged or kept at the original size, the choice of focal length should be determined according to the specific use scene and imaging distance.

Collimation or focusing requirements of light:

If it is used for laser collimation and focusing, it is necessary to choose a lens that can accurately control the propagation direction and focusing point of light. For example, in laser cutting, laser welding and other applications, the precision and laser damage resistance of the lens are highly required, and a specially designed laser focusing lens is usually selected.

For ordinary light focusing, such as flashlights, searchlights and other lighting equipment, it is necessary to choose a suitable lens according to the required illumination range and intensity. Generally speaking, a convex lens with a larger aperture can gather more light and provide stronger illumination.

Considering optical performance parameters:

Refractive index: The higher the refractive index, the stronger the bending ability of the lens to light, which can make the light focus or diverge more effectively under the same conditions. For example, in some application scenes that need high refractive index, such as lens systems with short focal length or optical instruments with strict requirements on light control, optical glass materials with high refractive index may be selected. However, materials with high refractive index may be relatively expensive and require higher technical requirements in the process of processing and use.

Dispersion: Dispersion refers to the degree to which light with different wavelengths is dispersed after passing through a lens. The lens with low dispersion can better maintain the color purity of light and reduce the color difference. For applications that require high color reproduction, such as color photography and optical display, lenses with low dispersion should be selected. For example, some special optical glass formulations or specially treated lens materials can effectively reduce dispersion.

Transmittance: A lens with high transmittance can let more light pass through and improve the efficiency of the optical system. When choosing a lens, we should pay attention to the transmittance of the lens in the required wavelength range. For example, for applications in the visible range, a lens with high transmittance in the wavelength range of 400nm-700nm should be selected; For infrared or ultraviolet applications, it is necessary to choose a special material lens with high transmittance in the corresponding band.

Aberration correction: Aberrations include spherical aberration, coma, astigmatism, field curvature and distortion, which will affect the imaging quality. High-quality lenses will undergo good aberration correction, making the imaging clearer and more realistic. When choosing, you can check the product specifications of the lens or consult the manufacturer to understand the degree of aberration correction. For applications that require extremely high imaging quality, such as astronomical observation and high-precision optical measurement, it is necessary to choose advanced lenses with very good aberration correction.

Pay attention to the physical characteristics of the lens;

Size and shape: according to the actual installation space and the design requirements of optical system, choose the lens with appropriate size and shape. Common lens shapes are plano-convex, biconvex, plano-concave, biconvex, meniscus, etc. Different lenses have different optical characteristics and suitable scenes. For example, a plano-convex lens is suitable for a simple focusing or collimating system; Meniscus lens can be used to correct aberration or change the propagation direction of light. At the same time, it is necessary to ensure that the size of the lens can match other parts of the optical system, so as to avoid difficulties in installation or influence on optical performance.

Thickness tolerance: the thickness tolerance of lens will affect its optical performance and mechanical installation. The lens with smaller thickness tolerance can ensure that the propagation path of light in the lens is more stable, thus improving the imaging quality. In some optical systems that require high precision, it is necessary to choose lenses with strict thickness tolerance. In addition, the ratio of the edge thickness to the center thickness of the lens should be considered to ensure the mechanical strength and stability of the lens.

Surface quality: The surface quality of a lens directly affects the transmission and reflection of light. The surface should be free of scratches, pits, pits and other defects, otherwise it will affect the clarity and brightness of imaging. Generally speaking, the higher the surface quality grade, the better the performance of the lens, but the price will increase accordingly. When selecting, the required surface quality level can be determined according to the specific application requirements and budget.

Eccentric: Eccentric refers to the deviation between the optical axis and the geometric axis of the lens. Excessive eccentricity will lead to the deviation of light propagation direction and affect the position and quality of imaging. When choosing lenses, we should try to choose products with small eccentricity to ensure the accuracy and stability of the optical system.

Considering the use environment and durability:

Temperature adaptability: If it is used in high temperature or low temperature environment, you need to choose a lens that can adapt to the corresponding temperature range. For example, in aerospace, field detection and other applications, extreme temperature conditions may be encountered. At this time, it is necessary to choose optical glass materials with good temperature stability or specially treated lenses to ensure that they can still maintain stable optical performance at different temperatures.

Corrosion resistance: if it is used in humid, corrosive gas or chemical environment, it is necessary to choose a lens with good corrosion resistance. For example, in some chemical and medical fields, optical lenses may come into contact with corrosive substances. At this time, corrosion-resistant materials, such as Shi Ying glass, should be selected, or special surface treatment, such as coating, should be carried out on the lenses to improve their corrosion resistance.

Mechanical strength: If the lens is easily impacted or vibrated by external force, it is necessary to choose a lens with higher mechanical strength. For example, in some vehicle and aviation applications, the optical lens needs to undergo certain vibration and impact. At this time, materials with high strength and good toughness, such as Corning glass, should be selected, or special structural design and reinforcement measures should be adopted to improve the mechanical strength of the lens.