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Product Description

Absorptive Neutral Density Attenuators
Anti-Reflection Coating: 400 nm-700 nm
OD: 0.1-6.0
Low Power Applications

LBTEK absorptive neutral density filters utilize a high-performance neutral density glass substrate, with an anti-reflection coating applied to one side of the substrate (specifications: Ravg < 0.5% @ 400-700 nm). These absorptive neutral density filters not only exhibit stable absorption characteristics within the 400-700 nm wavelength band but also effectively reduce internal light reflection within the product, making them suitable for various low-power laser energy attenuation applications. The product is currently available in 17 optical density specifications (OD 0.1-6.0) and 3 size options (Ø12.7 mm, Ø25.4 mm, Ø50 mm), which can fully meet diverse experimental requirements. Among them, the circular absorptive neutral density filters are also offered in a mounted version (MNDFA series), where the products are pre-installed in standard lens barrels of corresponding sizes (supporting disassembly). Furthermore, LBTEK can provide custom services for filters with specific sizes and optical density values. For customization inquiries, please feel free to contact technical support.

Diagram

Attribute

Surface Flatness (@633 nm)λ/4

Clear Aperture＞90% CA

Surface finish (scratches/pits)40/20

Parallelism＜10 arcsec

Neutral Density Filter, Anti-Reflection Coating 400 nm-700 nm, Installed

Low Power Applications
Anti-Reflection Coating: 400 nm-700 nm
Pre-installed mechanical housing, removable

LBTEK absorptive neutral density attenuators utilize neutral density glass coated with an anti-reflection coating (Ravg<0.5%@400-700 nm). While offering a flat absorption characteristic, they also effectively reduce internal reflections of light within the product in the 400-700 nm range. By precisely controlling the thickness and material type of the neutral density glass, high-precision OD attenuation can be achieved (OD tolerance ≤5%@550 nm). The MNDFA series are pre-installed in standard lens tubes (removable) and are available in various optical densities and sizes. The tube surface is engraved with parameters such as product model, operating wavelength, and OD value for easy user identification. The corresponding tube models for 0.5-inch, 1-inch, and 2-inch neutral density attenuators are: SM05-8A, SM1-8A, and SM2-8A. Note: The thickness of the absorptive neutral density filter is for reference only; the actual thickness depends on the optical density of the glass batch used.

Absorptive Neutral Density Attenuator with Mount Installed on Coaxial Mounting Plate

Product Model	Diameter	OD	Operating Wavelength	Unit Price	Lead Time
MNDFA10-60-A	Ø25.4 mm	6.0±0.30@550 nm	400 nm-700 nm	$68.77	today
MNDFA10-50-A	Ø25.4 mm	5.0±0.25@550 nm	400 nm-700 nm	$68.77	today
MNDFA10-40-A	Ø25.4 mm	4.0±0.20@550 nm	400 nm-700 nm	$68.77	today
MNDFA10-30-A	Ø25.4 mm	3.0±0.15@550 nm	400 nm-700 nm	$68.77	today
MNDFA10-20-A	Ø25.4 mm	2.0±0.10@550 nm	400 nm-700 nm	$68.77	today
MNDFA10-15-A	Ø25.4 mm	1.5±0.075@550 nm	400 nm-700 nm	$68.77	today
MNDFA10-13-A	Ø25.4 mm	1.3±0.065@550 nm	400 nm-700 nm	$68.77	today
MNDFA10-10-A	Ø25.4 mm	1.0±0.06@550 nm	400 nm-700 nm	$68.77	today
MNDFA10-09-A	Ø25.4 mm	0.9±0.045@550 nm	400 nm-700 nm	$68.77	today
MNDFA10-08-A	Ø25.4 mm	0.8±0.04@550 nm	400 nm-700 nm	$68.77	today
MNDFA10-07-A	Ø25.4 mm	0.7±0.035@550 nm	400 nm-700 nm	$68.77	today
MNDFA10-06-A	Ø25.4 mm	0.6±0.03@550 nm	400 nm-700 nm	$68.77	today
MNDFA10-05-A	Ø25.4 mm	0.5±0.03@550 nm	400 nm-700 nm	$68.77	today
MNDFA10-04-A	Ø25.4 mm	0.4±0.02@550 nm	400 nm-700 nm	$68.77	today
MNDFA10-03-A	Ø25.4 mm	0.3±0.015@550 nm	400 nm-700 nm	$68.77	today
MNDFA10-02-A	Ø25.4 mm	0.2±0.01@550 nm	400 nm-700 nm	$68.77	today
MNDFA10-01-A	Ø25.4 mm	0.1±0.005@550 nm	400 nm-700 nm	$68.77	today
MNDFA05-03-A New	Ø25.4 mm	0.3±0.015@550 nm	400 nm-700 nm	$42.49	today
MNDFA05-05-A New	Ø25.4 mm	0.3±0.015@550 nm	400 nm-700 nm	$42.49	today
MNDFA20-03-A New	Ø25.4 mm	0.3±0.015@550 nm	400 nm-650 nm	$137.15	today
MNDFA05-10-A New	Ø25.4 mm	0.3±0.015@550 nm	400 nm-700 nm	$42.49	today
MNDFA20-05-A New	Ø25.4 mm	0.3±0.015@550 nm	400 nm-650 nm	$137.15	today
MNDFA05-20-A New	Ø25.4 mm	0.3±0.015@550 nm	400 nm-700 nm	$42.49	today
MNDFA20-10-A New	Ø25.4 mm	0.3±0.015@550 nm	400 nm-650 nm	$137.15	today
MNDFA05-30-A New	Ø25.4 mm	0.3±0.015@550 nm	400 nm-700 nm	$42.49	4 weeks
MNDFA20-20-A New	Ø25.4 mm	0.3±0.015@550 nm	400 nm-650 nm	$137.15	4 weeks
MNDFA05-40-A New	Ø25.4 mm	0.3±0.015@550 nm	400 nm-700 nm	$42.49	4 weeks
MNDFA20-30-A New	Ø25.4 mm	0.3±0.015@550 nm	400 nm-650 nm	$137.15	4 weeks
MNDFA20-40-A New	Ø25.4 mm	0.3±0.015@550 nm	400 nm-650 nm	$137.15	4 weeks

Neutral Density Filter, Anti-Reflection Coating 400 nm-700 nm, Unmounted

Low Power Applications
Absorptive Neutral Density Filters
Anti-Reflection Coating 400 nm-700 nm

LBTEK absorptive neutral density attenuators utilize neutral density glass coated with anti-reflection coatings (Ravg<0.5%@400-700 nm). While offering stable absorption characteristics, they also effectively reduce internal reflections of light within the product in the 400-700 nm range. By precisely controlling the thickness and material type of the neutral density glass, high-precision OD attenuation can be achieved (OD tolerance ≤5%@550 nm). Currently, the absorptive neutral density attenuators (with anti-reflection coating 400-700 nm, unmounted) are available in various optical densities and sizes. They can be installed in standard lens tubes, fixed lens mounts, and various coaxial mounting plates of corresponding sizes. Customers can flexibly choose the optimal mounting method according to their specific application scenarios. Note: The thickness of the absorptive neutral density filter is for reference only; the actual thickness depends on the optical density of the glass batch used.

The uninstalled absorption-type neutral density filter is installed on a fixed lens mount.

Product Model	Diameter	OD	Operating Wavelength	Unit Price	Lead Time
NDFA20-13-SP	Ø50.0 mm	1.3±0.065@550 nm	400 nm-650 nm	$79.62	today
NDFA20-17-SP	Ø50.0 mm	1.7±0.085@550 nm	400 nm-650 nm	$79.62	today
NDFA10-60-A	Ø25.4 mm	6.0±0.30@550 nm	400 nm-700 nm	$59.36	today
NDFA10-50-A	Ø25.4 mm	5.0±0.25@550 nm	400 nm-700 nm	$59.36	today
NDFA10-15-A	Ø25.4 mm	1.5±0.075@550 nm	400 nm-700 nm	$59.36	today
NDFA10-13-A	Ø25.4 mm	1.3±0.065@550 nm	400 nm-700 nm	$59.36	5 weeks
NDFA10-10-A	Ø25.4 mm	1.0±0.06@550 nm	400 nm-700 nm	$59.36	today
NDFA10-09-A	Ø25.4 mm	0.9±0.045@550 nm	400 nm-700 nm	$59.36	today
NDFA10-08-A	Ø25.4 mm	0.8±0.04@550 nm	400 nm-700 nm	$59.36	today
NDFA10-07-A	Ø25.4 mm	0.7±0.035@550 nm	400 nm-700 nm	$59.36	today
NDFA10-06-A	Ø25.4 mm	0.6±0.03@550 nm	400 nm-700 nm	$59.36	today
NDFA10-05-A	Ø25.4 mm	0.5±0.03@550 nm	400 nm-700 nm	$59.36	today
NDFA10-04-A	Ø25.4 mm	0.4±0.02@550 nm	400 nm-700 nm	$59.36	today
NDFA10-03-A	Ø25.4 mm	0.3±0.015@550 nm	400 nm-700 nm	$59.36	today
NDFA10-02-A	Ø25.4 mm	0.2±0.01@550 nm	400 nm-700 nm	$59.36	today
NDFA10-01-A	Ø25.4 mm	0.1±0.005@550 nm	400 nm-700 nm	$59.36	today
NDFA10-40-A	Ø25.4 mm	4.0±0.20@550 nm	400 nm-700 nm	$57.92	4 weeks
NDFA10-30-A	Ø25.4 mm	3.0±0.15@550 nm	400 nm-700 nm	$57.92	4 weeks
NDFA10-20-A	Ø25.4 mm	2.0±0.10@550 nm	400 nm-700 nm	$57.92	today
NDFA05-03-A New	Ø25.4 mm	0.1±0.005@550 nm	400 nm-650 nm	$33.47	today
NDFA20-03-A New	Ø25.4 mm	0.1±0.005@550 nm	400 nm-650 nm	$122.77	today
NDFA05-05-A New	Ø25.4 mm	0.1±0.005@550 nm	400 nm-650 nm	$33.47	today
NDFA20-05-A New	Ø25.4 mm	0.1±0.005@550 nm	400 nm-650 nm	$122.77	today
NDFA05-10-A New	Ø25.4 mm	0.1±0.005@550 nm	400 nm-650 nm	$33.47	today
NDFA20-10-A New	Ø25.4 mm	0.1±0.005@550 nm	400 nm-650 nm	$122.77	today
NDFA05-20-A New	Ø25.4 mm	0.1±0.005@550 nm	400 nm-650 nm	$33.47	today
NDFA20-20-A New	Ø25.4 mm	0.1±0.005@550 nm	400 nm-650 nm	$122.77	today
NDFA05-30-A New	Ø25.4 mm	0.1±0.005@550 nm	400 nm-650 nm	$33.47	today
NDFA20-30-A New	Ø25.4 mm	0.1±0.005@550 nm	400 nm-650 nm	$122.77	today
NDFA05-40-A New	Ø25.4 mm	0.1±0.005@550 nm	400 nm-650 nm	$33.47	today
NDFA20-40-A New	Ø25.4 mm	0.1±0.005@550 nm	400 nm-650 nm	$122.77	today

Absorption-type neutral density filter, anti-reflection coating: 400-700 nm