Sep. 11, 2026

Which Way Should a Plano-Concave Lens Face in an Optical System?

Brief summary: Sunday Optics, an optical spherical lens manufacturer, explains that a plano-concave lens is normally installed with its concave surface facing the incoming collimated beam when the goal is to produce a clean, controlled diverging beam. This orientation often reduces spherical aberration compared with placing the plane surface first, but it is not a universal rule. The correct

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Sep. 10, 2026

What Is a Bi-Convex Lens Used For?

A Spherical Lens bends light through one or two curved surfaces. A bi-convex lens, also called a double-convex lens, has two outward-facing surfaces and is often used to focus or collect light. Engineers may search for a custom bi-convex spherical lens supplier when a standard lens does not match their focal length, coating, or diameter needs. In this guide, we explain what a bi-convex lens is

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Sep. 09, 2026

How Does a Plano-Concave Lens Expand a Laser Beam?

As an optical spherical lens manufacturer, Sunday Optics helps engineers select and use plano-concave lenses for laser beam expansion, beam spacing, and optical system design. This guide explains the working principle, required tools, setup steps, selection criteria, calculations, and common mistakes that affect beam quality.

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Sep. 08, 2026

How to Generate a Laser Line with a Cylindrical Lens

A cylindrical lens can transform a round laser beam into a narrow line by focusing or expanding the beam in only one direction. This guide explains how to generate a laser line with a cylindrical lens, select the correct optical components, align the system, improve line quality, and avoid common setup errors. It is suitable for laboratory experiments, machine vision, alignment, scanning,

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Sep. 08, 2026

How Does an Achromatic Doublet Correct Chromatic Aberration?

If your optical system produces colored fringes, blurred focal points, or inconsistent image sharpness, I recommend a simple three-step solution: identify the wavelength range, select a properly designed achromatic doublet, and verify the final assembly through focus-shift and wavefront testing. In this guide, we explain How Does an Achromatic Doublet Correct Chromatic Aberration? and show how

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Sep. 07, 2026

Convex vs. Concave Spherical Lenses: How Do They Control Light?

Choosing a Spherical Lens is not simply a matter of selecting the shape that “looks right.” Engineers and buyers often compare a convex spherical lens for collimating LED light, a concave spherical lens for beam expansion, or a custom optical spherical lens manufacturer when designing cameras, laser systems, sensors, projectors, and laboratory instruments. The decision depends on focal

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Sep. 07, 2026

Plano-Concave vs. Bi-Concave Lens: How Are They Different?

Choosing between a plano-concave and bi-concave Spherical Lens can determine whether a laser beam expands evenly, whether an imaging system introduces unnecessary distortion, and whether a compact optical assembly fits its design envelope. This plano-concave vs. bi-concave lens comparison explains the difference using the lensmaker’s equation, negative focal length, and radius of curvature. It

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Sep. 04, 2026

Why Does a Concave Lens Form a Virtual Image?

A common optical design problem occurs when engineers, students, or buyers expect a concave lens to project an image onto a screen but obtain no focused image. The underlying cause is not a manufacturing defect: a concave lens makes transmitted light diverge, so the rays do not physically meet on the opposite side of the lens. Instead, the eye traces those diverging rays backward and perceives

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Sep. 04, 2026

Effective Focal Length vs. Back Focal Length: What Is the Difference?

1/f = (n − 1)(1/R1 − 1/R2)

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Sep. 03, 2026

What Is Laser-Induced Damage Threshold in Optical Lenses?

What Is Laser-Induced Damage Threshold in Optical Lenses? Laser-Induced Damage Threshold (LIDT) is the maximum laser fluence or power density an optical lens can withstand before its coating, surface, or bulk material shows permanent damage. It is usually expressed in J/cm² for pulsed lasers or W/cm² for continuous-wave (CW) lasers. In practical applications, LIDT helps engineers select a safe

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Sep. 03, 2026

Achromatic Doublet vs. Spherical Singlet: Which Produces Better Images?

Choosing between an achromatic doublet vs. spherical singlet is not simply a question of buying the more expensive part. A Spherical Lens may be adequate for a low-cost sensor, collimator, or relaxed-focus lighting system, while a doublet is usually the safer choice when users need sharper color images across a visible wavelength band. The practical questions are familiar: Why do red, green, and

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Sep. 02, 2026

Sapphire vs. Fused Silica Lenses for Harsh Environments

For an optical spherical lens manufacturer, the most important question is not which material is universally better. The correct choice depends on wavelength, temperature, abrasion, chemical exposure, optical precision, service life, and total system cost. This guide compares sapphire and fused silica lenses for industrial imaging, laser systems, sensors, medical equipment, aerospace instruments,

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