Editorial Technical Reference

Collimating Lens

This page explains how Collimating Lens is classified within Computer, Electronic and Optical Product Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

An optical lens that converts the divergent light from a laser diode into a parallel beam.

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Product Specifications

Technical details and manufacturing context for Collimating Lens

Definition
A collimating lens is a critical optical component within a Laser Diode Assembly. Its primary function is to take the highly divergent, non-parallel light emitted directly from the laser diode chip and reshape it into a collimated (parallel) beam. This transformation is essential for applications requiring a focused, low-divergence light source, such as in laser pointers, barcode scanners, fiber optic coupling, and various measurement and alignment systems. The lens utilizes its curved surfaces (typically plano-convex or aspheric) to refract the incoming divergent rays. By precisely matching the lens's focal length to the distance from the laser diode's emission point (the virtual source), the lens bends the rays so they exit parallel to the optical axis, minimizing beam divergence. Typical specifications include focal length from 4.5 to 15 mm, numerical aperture from 0.15 to 0.60, clear aperture from 3 to 20 mm, transmittance of at least 95%, surface flatness from λ/4 to λ/10 (ISO 10110), surface quality from 40-20 scratch-dig (ISO 10110), operating wavelength from 400 to 1600 nm, operating temperature from -40 to 85 °C, storage temperature from -50 to 100 °C, weight from 2 to 50 g, outer diameter from 6 to 25.4 mm, and back focal length from 1.5 to 10 mm. Materials commonly used include optical glass (e.g., N-BK7, fused silica) and plastics (e.g., PMMA, polycarbonate) for cost-sensitive applications. These values are directory reference ranges and must be verified with the legal manufacturer or supplier for the specific model and application.
Working Principle
The collimating lens works by refracting light rays at its curved surfaces. The lens is positioned so that its focal point coincides with the laser diode's emission point. Divergent rays from the diode enter the lens and are bent according to Snell's law. For a plano-convex or aspheric lens, the curvature is designed to redirect rays that originate from the focal point so they emerge parallel to the optical axis. The numerical aperture determines the light-gathering ability, while the focal length sets the beam diameter and divergence. Proper alignment is critical; any deviation causes increased divergence or astigmatism.
Common Materials
Optical Glass (e.g., N-BK7, Fused Silica), Plastic (e.g., PMMA, Polycarbonate for cost-sensitive applications)
Technical Parameters
ParameterTypical rangeNotes & selection driver
Focal Length4.5–15 mmDetermines beam diameter and divergence
Numerical Aperture0.15–0.60Higher NA captures more light but reduces working distance
Clear Aperture3–20 mmMust exceed laser beam diameter
Transmittance≥95 %AR coating required for high efficiency
Surface Flatnessλ/4–λ/10Higher precision reduces wavefront errorISO 10110
Surface Quality40–20 scratch-digBetter quality reduces scatteringISO 10110
Operating Wavelength400–1600 nmCoating optimized for specific wavelength
Operating Temperature-40–85 °CThermal drift affects focus
Storage Temperature-50–100 °CNon-condensing environment
Weight2–50 gDepends on size and material
Outer Diameter6–25.4 mmStandard sizes for mounting
Back Focal Length1.5–10 mmCritical for laser diode packaging

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Lens Element Part
    The optical substrate (glass or plastic) with precisely ground and polished curved surfaces that performs the refraction.
    Material: Optical Glass or Optical Plastic
  • Anti-Reflection Coating Part
    A thin-film multilayer coating applied to lens surfaces to maximize transmission and minimize back-reflection at the design wavelength.
    Material: Dielectric materials (e.g., MgF2, TiO2, SiO2)
  • Lens Mount / Housing
    A mechanical barrel or holder that precisely positions and secures the lens element relative to the laser diode, often with adjustment threads.
    Material: Aluminum, Brass, or Plastic

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Laser Diode Assembly
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Laser scanner module
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Emitter Unit
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Emitter Module
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Laser Diode Module
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Collimating Lens Assembly
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Laser Emitter Module
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Optical Lens System
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Laser Emitter
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Laser Assembly
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Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric to 1.5 atm (standard optical environment)
other spec: Wavelength range: 400-1600 nm typical, Beam divergence angle: <2 mrad after collimation
temperature: -40°C to +85°C (operational), -55°C to +125°C (storage)
Media Compatibility
✓ Laser diode emission in free-space optical systems ✓ Fiber optic coupling applications ✓ Laboratory optical bench setups
Unsuitable: High particulate or abrasive dust environments without protective housing
Sizing Data Required
  • Laser diode wavelength (nm)
  • Numerical aperture (NA) or divergence angle of source
  • Required beam diameter and collimation distance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Surface contamination and coating degradation
Cause: Accumulation of dust, oils, or particulates from the environment, combined with improper cleaning methods or exposure to corrosive atmospheres, leading to reduced optical transmission and potential permanent damage to anti-reflective coatings.
Thermal stress cracking
Cause: Rapid temperature fluctuations or localized overheating due to high-intensity light sources, poor thermal management in the housing, or exposure to direct heat sources, causing micro-fractures or complete lens failure.
Maintenance Indicators
  • Visible discoloration, haze, or dark spots on the lens surface indicating contamination or coating failure
  • Audible crackling or popping sounds during operation, suggesting thermal stress or material fatigue
Engineering Tips
  • Implement strict environmental controls with clean, temperature-stable conditions and use only manufacturer-recommended cleaning solutions and lint-free wipes to prevent surface damage
  • Install proper thermal management systems, including heat sinks or active cooling, and ensure gradual thermal cycling during startup/shutdown to minimize thermal shock

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 10110-7:2017 (Optics and photonics - Preparation of drawings for optical elements and systems - Surface imperfection tolerances) ANSI Z80.1-2015 (Ophthalmic Lenses - Prescription Requirements) DIN 3140-7:2015 (Optics and photonics - Preparation of drawings for optical elements and systems - Surface form tolerances)

Quoted from the published standard.

Manufacturing Precision
  • Surface Figure Error: λ/4 at 632.8 nm
  • Centration: ±0.02 mm
Quality Inspection
  • Interferometric Surface Testing
  • Beam Profile Analysis

Manufacturers of Collimating Lens

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Frequently Asked Questions

What is the primary function of a collimating lens?

It converts the divergent light from a laser diode into a parallel beam, reducing beam divergence for applications like laser pointers and fiber coupling.

What materials are commonly used for collimating lenses?

Optical glass such as N-BK7 or fused silica, and plastics like PMMA or polycarbonate for cost-sensitive applications.

How do I choose the right focal length?

The focal length determines beam diameter and divergence. It must match the distance from the laser diode emission point to achieve proper collimation. Verify with the manufacturer.

What standards apply to surface quality and flatness?

Surface flatness and quality are specified per ISO 10110, with typical values of λ/4 to λ/10 for flatness and 40-20 scratch-dig for quality. Confirm with the supplier.
Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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