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TECHSPEC^® components are designed, specified, or manufactured by Edmund Optics. Learn More

λ/4 N-BK7 Laser Line Windows

See More by SCHOTT Optical Components

<0.25% Reflection at Design Wavelength
Coatings Available for HeNe, Diode, and Nd:YAG Laser Sources
Precision N-BK7 Substrate
Also Available Uncoated, MgF₂ Coated and VIS 0° Coated

Common Specifications

Bevel:

Protective as needed

Parallelism (arcmin):

≤1

Young's Modulus (GPa):

Poisson's Ratio:

0.206

Edges:

Fine Ground

Substrate:

N-BK7

Surface Flatness (P-V):

λ/4

Surface Quality:

60-40

Index of Refraction (n_d):

1.516

Abbe Number (v_d):

64.17

Coefficient of Thermal Expansion CTE (10^-6/°C):

7.1 (-30 to +70°C)
8.3 (+20 to +300°C)

Density (g/cm³):

2.51

Products
Product Details
Technical Information
Accessories
Related Products
Resources

Products

Coating	Dia. (mm)	Thickness (mm)	DWL (nm)	Stock Number	Price	Buy

Laser V-Coat (405nm) Laser V-Coat (405nm)	5.00 5.00	2.00 2.00	405 405	#64-035	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (532nm) Laser V-Coat (532nm)	5.00 5.00	2.00 2.00	532 532	#49-125	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (633nm) Laser V-Coat (633nm)	5.00 5.00	2.00 2.00	633 633	#49-135	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (785nm) Laser V-Coat (785nm)	5.00 5.00	2.00 2.00	785 785	#64-045	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (980nm) Laser V-Coat (980nm)	5.00 5.00	2.00 2.00	980 980	#83-515	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (1064nm) Laser V-Coat (1064nm)	5.00 5.00	2.00 2.00	1064 1064	#49-145	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (1550nm) Laser V-Coat (1550nm)	5.00 5.00	2.00 2.00	1550 1550	#83-525	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (405nm) Laser V-Coat (405nm)	9.00 9.00	2.00 2.00	405 405	#64-036	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (532nm) Laser V-Coat (532nm)	9.00 9.00	2.00 2.00	532 532	#49-126	73.95 £73.95 Qty 6+ £59.50 Request Quote	In Stock ×
Laser V-Coat (633nm) Laser V-Coat (633nm)	9.00 9.00	2.00 2.00	633 633	#49-136	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (785nm) Laser V-Coat (785nm)	9.00 9.00	2.00 2.00	785 785	#64-046	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (980nm) Laser V-Coat (980nm)	9.00 9.00	2.00 2.00	980 980	#83-516	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (1064nm) Laser V-Coat (1064nm)	9.00 9.00	2.00 2.00	1064 1064	#49-146	73.95 £73.95 Qty 6+ £59.50 Request Quote	In Stock ×
Laser V-Coat (1550nm) Laser V-Coat (1550nm)	9.00 9.00	2.00 2.00	1550 1550	#83-526	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (405nm) Laser V-Coat (405nm)	10.00 10.00	2.00 2.00	405 405	#64-037	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (532nm) Laser V-Coat (532nm)	10.00 10.00	2.00 2.00	532 532	#49-127	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (633nm) Laser V-Coat (633nm)	10.00 10.00	2.00 2.00	633 633	#49-137	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (785nm) Laser V-Coat (785nm)	10.00 10.00	2.00 2.00	785 785	#64-047	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (980nm) Laser V-Coat (980nm)	10.00 10.00	2.00 2.00	980 980	#83-517	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (1064nm) Laser V-Coat (1064nm)	10.00 10.00	2.00 2.00	1064 1064	#49-147	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (1550nm) Laser V-Coat (1550nm)	10.00 10.00	2.00 2.00	1550 1550	#83-527	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (405nm) Laser V-Coat (405nm)	12.50 12.50	3.00 3.00	405 405	#64-038	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (532nm) Laser V-Coat (532nm)	12.50 12.50	3.00 3.00	532 532	#49-128	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (633nm) Laser V-Coat (633nm)	12.50 12.50	3.00 3.00	633 633	#49-138	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (785nm) Laser V-Coat (785nm)	12.50 12.50	3.00 3.00	785 785	#64-048	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (980nm) Laser V-Coat (980nm)	12.50 12.50	3.00 3.00	980 980	#83-518	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (1064nm) Laser V-Coat (1064nm)	12.50 12.50	3.00 3.00	1064 1064	#49-148	73.95 £73.95 Qty 6+ £59.50 Request Quote	Contact Us ×
Laser V-Coat (1550nm) Laser V-Coat (1550nm)	12.50 12.50	3.00 3.00	1550 1550	#83-528	73.95 £73.95 Qty 6+ £59.50 Request Quote	3-4 days ×
Laser V-Coat (405nm) Laser V-Coat (405nm)	15.00 15.00	3.00 3.00	405 405	#64-039	75.22 £75.22 Qty 6+ £60.35 Request Quote	3-4 days ×
Laser V-Coat (532nm) Laser V-Coat (532nm)	15.00 15.00	3.00 3.00	532 532	#49-129	75.22 £75.22 Qty 6+ £60.35 Request Quote	3-4 days ×
Laser V-Coat (633nm) Laser V-Coat (633nm)	15.00 15.00	3.00 3.00	633 633	#49-139	75.22 £75.22 Qty 6+ £60.35 Request Quote	3-4 days ×
Laser V-Coat (785nm) Laser V-Coat (785nm)	15.00 15.00	3.00 3.00	785 785	#64-049	75.22 £75.22 Qty 6+ £60.35 Request Quote	3-4 days ×
Laser V-Coat (980nm) Laser V-Coat (980nm)	15.00 15.00	3.00 3.00	980 980	#83-519	75.22 £75.22 Qty 6+ £60.35 Request Quote	3-4 days ×
Laser V-Coat (1064nm) Laser V-Coat (1064nm)	15.00 15.00	3.00 3.00	1064 1064	#49-149	75.22 £75.22 Qty 6+ £60.35 Request Quote	3-4 days ×
Laser V-Coat (1550nm) Laser V-Coat (1550nm)	15.00 15.00	3.00 3.00	1550 1550	#83-529	75.22 £75.22 Qty 6+ £60.35 Request Quote	In Stock ×
Laser V-Coat (405nm) Laser V-Coat (405nm)	20.00 20.00	3.00 3.00	405 405	#64-040	79.47 £79.47 Qty 6+ £63.75 Request Quote	3-4 days ×
Laser V-Coat (532nm) Laser V-Coat (532nm)	20.00 20.00	3.00 3.00	532 532	#49-130	79.47 £79.47 Qty 6+ £63.75 Request Quote	3-4 days ×
Laser V-Coat (633nm) Laser V-Coat (633nm)	20.00 20.00	3.00 3.00	633 633	#49-140	79.47 £79.47 Qty 6+ £63.75 Request Quote	In Stock ×
Laser V-Coat (785nm) Laser V-Coat (785nm)	20.00 20.00	3.00 3.00	785 785	#64-050	79.47 £79.47 Qty 6+ £63.75 Request Quote	In Stock ×
Laser V-Coat (980nm) Laser V-Coat (980nm)	20.00 20.00	3.00 3.00	980 980	#83-520	79.47 £79.47 Qty 6+ £63.75 Request Quote	3-4 days ×
Laser V-Coat (1064nm) Laser V-Coat (1064nm)	20.00 20.00	3.00 3.00	1064 1064	#49-150	79.47 £79.47 Qty 6+ £63.75 Request Quote	3-4 days ×
Laser V-Coat (1550nm) Laser V-Coat (1550nm)	20.00 20.00	3.00 3.00	1550 1550	#83-530	79.47 £79.47 Qty 6+ £63.75 Request Quote	3-4 days ×
Laser V-Coat (405nm) Laser V-Coat (405nm)	25.00 25.00	4.00 4.00	405 405	#64-041	86.70 £86.70 Qty 6+ £69.70 Request Quote	3-4 days ×
Laser V-Coat (532nm) Laser V-Coat (532nm)	25.00 25.00	4.00 4.00	532 532	#49-131	86.70 £86.70 Qty 6+ £69.70 Request Quote	3-4 days ×
Laser V-Coat (633nm) Laser V-Coat (633nm)	25.00 25.00	4.00 4.00	633 633	#49-141	86.70 £86.70 Qty 6+ £69.70 Request Quote	3-4 days ×
Laser V-Coat (785nm) Laser V-Coat (785nm)	25.00 25.00	4.00 4.00	785 785	#64-051	86.70 £86.70 Qty 6+ £69.70 Request Quote	3-4 days ×
Laser V-Coat (980nm) Laser V-Coat (980nm)	25.00 25.00	4.00 4.00	980 980	#83-521	86.70 £86.70 Qty 6+ £69.70 Request Quote	3-4 days ×
Laser V-Coat (1064nm) Laser V-Coat (1064nm)	25.00 25.00	4.00 4.00	1064 1064	#49-151	86.70 £86.70 Qty 6+ £69.70 Request Quote	3-4 days ×
Laser V-Coat (1550nm) Laser V-Coat (1550nm)	25.00 25.00	4.00 4.00	1550 1550	#83-531	86.70 £86.70 Qty 6+ £69.70 Request Quote	3-4 days ×
Laser V-Coat (405nm) Laser V-Coat (405nm)	30.00 30.00	4.00 4.00	405 405	#64-042	89.25 £89.25 Qty 6+ £71.40 Request Quote	3-4 days ×
Laser V-Coat (532nm) Laser V-Coat (532nm)	30.00 30.00	4.00 4.00	532 532	#49-132	89.25 £89.25 Qty 6+ £71.40 Request Quote	Contact Us ×
Laser V-Coat (633nm) Laser V-Coat (633nm)	30.00 30.00	4.00 4.00	633 633	#49-142	89.25 £89.25 Qty 6+ £71.40 Request Quote	3-4 days ×
Laser V-Coat (785nm) Laser V-Coat (785nm)	30.00 30.00	4.00 4.00	785 785	#64-052	89.25 £89.25 Qty 6+ £71.40 Request Quote	3-4 days ×
Laser V-Coat (980nm) Laser V-Coat (980nm)	30.00 30.00	4.00 4.00	980 980	#83-522	89.25 £89.25 Qty 6+ £71.40 Request Quote	3-4 days ×
Laser V-Coat (1064nm) Laser V-Coat (1064nm)	30.00 30.00	4.00 4.00	1064 1064	#49-152	89.25 £89.25 Qty 6+ £71.40 Request Quote	In Stock ×
Laser V-Coat (1550nm) Laser V-Coat (1550nm)	30.00 30.00	4.00 4.00	1550 1550	#83-532	89.25 £89.25 Qty 6+ £71.40 Request Quote	3-4 days ×
Laser V-Coat (405nm) Laser V-Coat (405nm)	40.00 40.00	4.00 4.00	405 405	#64-043	101.15 £101.15 Qty 6+ £80.75 Request Quote	3-4 days ×
Laser V-Coat (532nm) Laser V-Coat (532nm)	40.00 40.00	4.00 4.00	532 532	#49-133	101.15 £101.15 Qty 6+ £80.75 Request Quote	Contact Us ×
Laser V-Coat (633nm) Laser V-Coat (633nm)	40.00 40.00	4.00 4.00	633 633	#49-143	101.15 £101.15 Qty 6+ £80.75 Request Quote	Contact Us ×
Laser V-Coat (785nm) Laser V-Coat (785nm)	40.00 40.00	4.00 4.00	785 785	#64-053	101.15 £101.15 Qty 6+ £80.75 Request Quote	3-4 days ×
Laser V-Coat (980nm) Laser V-Coat (980nm)	40.00 40.00	4.00 4.00	980 980	#83-523	101.15 £101.15 Qty 6+ £80.75 Request Quote	3-4 days ×
Laser V-Coat (1064nm) Laser V-Coat (1064nm)	40.00 40.00	4.00 4.00	1064 1064	#49-153	101.15 £101.15 Qty 6+ £80.75 Request Quote	3-4 days ×
Laser V-Coat (1550nm) Laser V-Coat (1550nm)	40.00 40.00	4.00 4.00	1550 1550	#83-533	101.15 £101.15 Qty 6+ £80.75 Request Quote	3-4 days ×
Laser V-Coat (405nm) Laser V-Coat (405nm)	50.00 50.00	4.00 4.00	405 405	#64-044	104.55 £104.55 Qty 6+ £83.30 Request Quote	3-4 days ×
Laser V-Coat (532nm) Laser V-Coat (532nm)	50.00 50.00	4.00 4.00	532 532	#49-134	104.55 £104.55 Qty 6+ £83.30 Request Quote	3-4 days ×
Laser V-Coat (633nm) Laser V-Coat (633nm)	50.00 50.00	4.00 4.00	633 633	#49-144	104.55 £104.55 Qty 6+ £83.30 Request Quote	3-4 days ×
Laser V-Coat (785nm) Laser V-Coat (785nm)	50.00 50.00	4.00 4.00	785 785	#64-054	104.55 £104.55 Qty 6+ £83.30 Request Quote	3-4 days ×
Laser V-Coat (980nm) Laser V-Coat (980nm)	50.00 50.00	4.00 4.00	980 980	#83-524	104.55 £104.55 Qty 6+ £83.30 Request Quote	3-4 days ×
Laser V-Coat (1064nm) Laser V-Coat (1064nm)	50.00 50.00	4.00 4.00	1064 1064	#49-154	104.55 £104.55 Qty 6+ £83.30 Request Quote	In Stock ×
Laser V-Coat (1550nm) Laser V-Coat (1550nm)	50.00 50.00	4.00 4.00	1550 1550	#83-534	104.55 £104.55 Qty 6+ £83.30 Request Quote	3-4 days ×

Product Details

TECHSPEC® λ/4 N-BK7 Laser Line Windows are ideally suited for industrial and low power laser applications. The high tolerance design yields minimal beam distortion and scatter. Anti-reflection coatings provide <0.25% reflection at the coating's design wavelengths.

Technical Information

Accessories

Resources

Filter

Understanding and Specifying LIDT of Laser Components

Laser induced damage threshold (LIDT) denotes the maximum laser fluence an optical component can withstand with an acceptable amount of risk.

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Anti-Reflection (AR) Coatings

Anti-reflection (AR) coatings are applied to optical components to increase throughput and reduce hazards caused by back-reflections.

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An Introduction to Optical Coatings

Optical coatings are used to influence the transmission, reflection, or polarization properties of an optical component.

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Gaussian Beams Calculator

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Understanding Surface Roughness

Surface roughness describes how a shape deviates from its ideal form. This is critical for controlling light scatter in laser devices and other optical systems.

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Coating Impact on Flatness Calculator

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Common Laser Optics Materials

Understanding the most commonly used laser optics materials will allow for easy navigation of EO’s wide selection of laser optics components.

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Importance of Beam Diameter on Laser Damage Threshold

The diameter of a laser highly affects an optic’s laser induced damage (LIDT) as beam diameter directly impacts the probability of laser damage.

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The Hidden Effects of Optical Coating Stress

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Ion-Beam Sputtering (IBS)

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A Guide to (Not Over) Specifying Losses in Laser Optics

Overspecifying optical losses in laser systems will not further improve your performance or reliability, but it could cost you additional money and/or time.

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Free-Space Optical Communication – TRENDING IN OPTICS: EPISODE 6

Free-space optical (FSO) communications transmit information wirelessly through the air using lasers with improved bandwidth. Learn more!

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Top Trends of 2022 – TRENDING IN OPTICS: EPISODE 8

Happy holidays from Edmund Optics! Learn about the top trends in the photonics industry covered in our Trending in Optics Series in 2022.

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Surface Accuracy

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Is it possible to directly measure absorption or scatter?

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Development of a Robust Laser Damage Threshold Testbed

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Development of US national laser damage standard: 2020 status

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Uncertainty in LIDT Specifications

Laser induced damage threshold (LIDT) of optics is a statistical value influenced by defect density, the testing method, and fluctuations in the laser.

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Understanding Surface Quality Specifications

The surface quality of optical components the scattering off of its surface, which is especially important in laser optics applications.

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Anti-Reflection (AR) Coating

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Bevel

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Parallelism

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Seamed Edge

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Introduction to Basic Ray Optics

An understanding of refraction and basic ray optics is a critical foundation for understanding more complicated optical concepts and technologies.

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Different Types of LIDT Specifications

Not all optical components are tested for laser-induced damage threshold (LIDT) and testing methods differ, resulting in different types of LIDT specifications.

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Key Parameters of a Laser System

Learn the key parameters that must be considered to ensure you laser application is successful. Common terminology will be established for these parameters.

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Laser Damage Threshold Testing

Testing laser induced damage threshold (LIDT) is not standardized, so understanding how your optics were tested is critical for predicting performance.

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Metrology for Laser Optics

Metrology is critical for ensuring that optical components consistently meet their desired specifications, especially in laser applications.

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Laser Polarization: The Importance of Polarization in Laser Applications

Understanding the polarization of laser light is critical for many applications, as polarization impacts reflectance, focusing the beam, and other key behaviors.

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Laser Optics Lab Trailer

The Laser Optics Lab video series discusses laser optics concepts including specifications, coating technologies, product types, and more

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Introduction to Laser Optics Lab

The Laser Optics Lab video series discusses laser optics concepts including specifications, coating technologies, product types, and more

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Laser Optics Lab:Back Reflections

Back reflections are created when some or part of your beam are reflected back to the source.

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Laser Optics Lab: Coatings

Optical coatings are composed of thin-film layers used to enhance transmission or reflection properties within an optical system.

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Laser Optics Lab:Specifications for Selecting a Laser

When determining which laser to use for your application, consider the following specifications: wavelength, coherence length, beam divergence, and Rayleigh range.

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LIGHT TALK - EPISODE 3: Laser Damage Testing with Matthew Dabney

Join our discussion around laser damage testing in the third episode of our LIGHT TALKS series.

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LIGHT TALK - EPISODE 4: Lasers & Optics with Kasia Sieluzycka and Nick Smith

Learn about trends in laser applications including increasing powers and decreasing pulse durations in this conversation with Kasia Sieluzycka and Nick Smith.

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LIGHT TALK - EPISODE 8: Laser Magic! with Angi Compatangelo

From tattoo removal to diagnosing cancer, lasers can transform our lives in countless ways. Join our conversation about laser in skin care and diagnostics.

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Resolving damage ambiguity and laser-induced damage threshold (LIDT) complications

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The art and science of designing optics for laser-induced damage threshold

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What makes laser optics different from normal optics?

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Surface Flatness

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Transmission

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Building a Mach-Zehnder Interferometer

Learn how to assemble, align, and use a Mach-Zehnder Interferometer completely out of off-the-shelf products from Edmund Optics in this detailed guide.

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Clear Aperture (CA)

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Laser

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Laser Damage Threshold

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Edmund Optics Global Manufacturing Facilities

Edmund Optics® (EO) manufactures millions of precision optical components and subassemblies every year in our 5 global manufacturing facilities.

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Metrology at Edmund Optics: Measuring as a Key Component of Manufacturing

Learn about the metrology that Edmund Optics® uses to guarantee the quality of all optical components and assemblies.

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Surface Quality

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λ/4 N-BK7 Laser Line Windows

Can't find what you need?

Common Specifications

Products

Product Details

Technical Information

Accessories

Related Products

Resources

Understanding and Specifying LIDT of Laser Components

Anti-Reflection (AR) Coatings

An Introduction to Optical Coatings

Gaussian Beams Calculator

Understanding Surface Roughness

Coating Impact on Flatness Calculator

Common Laser Optics Materials

Importance of Beam Diameter on Laser Damage Threshold

The Hidden Effects of Optical Coating Stress

Ion-Beam Sputtering (IBS)

A Guide to (Not Over) Specifying Losses in Laser Optics

Free-Space Optical Communication – TRENDING IN OPTICS: EPISODE 6

Top Trends of 2022 – TRENDING IN OPTICS: EPISODE 8

Surface Accuracy

Is it possible to directly measure absorption or scatter?

Development of a Robust Laser Damage Threshold Testbed

Development of US national laser damage standard: 2020 status

Uncertainty in LIDT Specifications

Understanding Surface Quality Specifications

Anti-Reflection (AR) Coating

Bevel

Parallelism

Seamed Edge

Introduction to Basic Ray Optics

Different Types of LIDT Specifications

Key Parameters of a Laser System

Laser Damage Threshold Testing

Metrology for Laser Optics

Laser Polarization: The Importance of Polarization in Laser Applications

Laser Optics Lab Trailer

Introduction to Laser Optics Lab

Laser Optics Lab:Back Reflections

Laser Optics Lab: Coatings

Laser Optics Lab:Specifications for Selecting a Laser

LIGHT TALK - EPISODE 3: Laser Damage Testing with Matthew Dabney

LIGHT TALK - EPISODE 4: Lasers & Optics with Kasia Sieluzycka and Nick Smith

LIGHT TALK - EPISODE 8: Laser Magic! with Angi Compatangelo

Resolving damage ambiguity and laser-induced damage threshold (LIDT) complications

The art and science of designing optics for laser-induced damage threshold

What makes laser optics different from normal optics?

Surface Flatness

Transmission

Building a Mach-Zehnder Interferometer

Clear Aperture (CA)

Laser

Laser Damage Threshold

Edmund Optics Global Manufacturing Facilities

Metrology at Edmund Optics: Measuring as a Key Component of Manufacturing

Surface Quality