High Precision BK7 Glass Achromatic Doublet Lens for Microscope/Telescope

1. Material

• Core Elements: Precision-bonded pair of optical elements.

• Primary Material: Crown Glass: High-quality BK7 (Schott designation) borosilicate glass for the positive (converging) element. Renowned for excellent homogeneity, transmission (approx. 92% in visible spectrum), and low bubble/inclusion content.

• Secondary Material: Flint Glass: Typically a higher dispersion glass (e.g., F2, SF2) for the negative (diverging) element.

• Bonding: Cemented using high-transparency, low-stress optical adhesive (e.g., Canada balsam historically, modern epoxies/UV-cured adhesives).

2. Key Properties

• Achromatic Design: Significantly reduces chromatic aberration by bringing two primary wavelengths (e.g., red/C & blue/F lines) to a common focal point. Minimizes color fringing ("purple haze").

• High Precision: Features tight tolerances on centering (<3 arcmin), surface figure (λ/4 or better), surface quality (scratch-dig 40-20 or finer), and focal length.

• Wavefront Accuracy: Optimized for minimal wavefront distortion.

• Low Stress: Manufacturing and bonding processes minimize internal stress, preserving optical performance.

• Durability: BK7 offers good chemical resistance and mechanical stability.

3. Primary Function

• Chromatic Aberration Correction: The core purpose is to eliminate color blur caused by dispersion in single-element lenses, providing sharper, truer color images.

• Spherical Aberration Reduction: The doublet design also helps minimize spherical aberration, improving overall image sharpness and contrast, especially off-axis.

• Precision Focusing: Delivers high-resolution, high-contrast images by focusing a broad spectrum of light accurately onto a single plane.

4. Critical Applications

• • Microscopes:

    • Essential in objective lenses (especially higher magnifications like 40x, 60x, 100x oil immersion) for crisp, color-accurate specimen imaging (biology, pathology, materials science).

    • Used in eyepieces for enhanced viewing clarity and reduced eye strain.

  • Telescopes:

    • Fundamental component in objective lenses for refracting telescopes (achromats).

    • Key element in high-quality eyepieces (e.g., Kellner, Plössl designs) for planetary and lunar observation, minimizing false color.

    • Used in Barlow lenses and correctors.

  • Collimators & Other Instruments: Used where precise, color-corrected collimation or imaging is required (e.g., laser alignment, inspection systems).

Introduction

Shanghai Longway Special Glass Co., Ltd. has been a professional supplier in the glass industry for over 20 years. With its expertise spanning across various fields, including optics, laser, imaging, and lighting etc., the company has established itself as a trusted partner for businesses worldwide. The company's commitment to providing high-quality glass products and services has earned it a reputation as a reliable supplier of choice among major corporations and small businesses alike.

Our Team

The team at Shanghai Longway Special Glass Co., Ltd. consists of professional experts with extensive experience in the field of glass manufacturing. These skilled technicians have honed their expertise through years of hands-on training and continuous education, ensuring that they remain up-to-date on the latest techniques and technologies.

Our Capabilities

Shanghai Longway Special Glass Co., Ltd.'s capabilities include:

 Cutting: Advanced cutting equipment allows for precise cuts in a variety of glass types.

Grinding: High-speed grinding machines enable efficient surface preparation.

Polishing: Automated polishing systems guarantee exceptional optical clarity.

Molding: Sophisticated molding techniques permit the creation of intricate shapes and designs.

Blowing: Expertise in blow-and-form processing enables the production of hollow glass products, such as bottles and jars.

Tempering: Heat-treating equipment ensures that glass products meet or exceed industry standards for thermal shock resistance.

Our Raw Materials

The company offers a wide range of raw materials and processed glass products, normally including:

Optical Glass: High-quality optical glass suitable for precision applications.

Borosilicate Glass: Durable borosilicate glass ideal for laboratory equipment and medical devices.

Quartz Glass: Pure quartz glass utilized in various industries, including electronics and optics.

Float Glass: Large sheets of float glass suitable for architectural applications and flat glass products.

Soda Lime Glass: Economical soda lime glass used for a wide range of industrial and commercial applications.

Our Quality Control Process

At Shanghai Longway Special Glass Co., Ltd., quality control is an integral part of the manufacturing process. Each product undergoes rigorous inspection to ensure that it meets or exceeds customer expectations. This commitment to excellence has earned the company a reputation as a trusted supplier of high-quality glass products.

Our Commitment to Excellence

At Shanghai Longway Special Glass Co., Ltd., we are committed to delivering exceptional quality glass products that meet or exceed customer expectations. Our team of professional experts is dedicated to providing expert advice and assistance in selecting the most suitable materials and processing techniques for specific needs. We take pride in our state-of-the-art facility, equipped with cutting-edge machinery and technology, ensuring that every product meets the highest standards.

Why Choose Us?

Shanghai Longway Special Glass Co., Ltd. is a trusted supplier of high-quality glass products, committed to delivering exceptional quality, innovation, and customer satisfaction. With over 20 years of experience and expertise spanning across various fields, we are well-positioned to meet the evolving needs of businesses worldwide. We look forward to serving your needs and meeting your expectations.