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[i] Outside of the context of laser safety, Optical Density more commonly refers to the refractive index, and the term ‘Absorbance’ is used in lieu of what we are referring to here as Optical Density.

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We stand firmly behind the quality and reliability of our products. If our resolution does not meet your satisfaction, we are prepared to discuss alternative solutions, including a refund. Please reach out to discuss how we can best serve you.

If you are in doubt whether or not your aiming beam is eye-safe for diffused viewing, please check with your laser safety officer or call us before making any assumptions. Recently our team has come across wavelengths utilized for aiming beams that are inappropriate without proper laser safety protection.

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Below is an example for how to read the shorthand notation for optical density and the attenuation of energy passing through a given filter.

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However, some glasses offer protection from multiple wavelengths. Furthermore, another way to combat dealing with multiple lasers may be to wear multiple laser safety glasses.

Answer: No, this is not the correct way to view laser safety, protecting from a lower or higher wavelength outside the specified range for a laser safety product is not a safe way to shop.

Screws: This issue is unprecedented for us, but we value your feedback. We will expedite the dispatch of replacement screws. Please contact us to arrange this. Elevation Mechanism: We're interested in understanding the specific issue you've encountered to ensure it doesn't happen again. We'd appreciate the opportunity to discuss this further and find a solution.

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Thank you for your review. We're pleased to hear that our service has met your expectations. Regarding your experience with the face shield:

Never look at any laser (including the aiming beam) directly. Stand behind the beam while viewing it, and do not bring your eyes near the axis during alignment or any other operation with lasers. All laser safety PPE is for unintentional direct and diffused viewing only. If you are hit with any laser in the eye, look away immediately.

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If the alignment beam exceeds the MPE, use proper alignment eyewear (where the MPE threshold is not exceeded factoring appropriate exposure duration). Attenuating the laser to a point it cannot be seen is an issue. So, make sure to align the laser correctly. Laser safety alignment eyewear should be used at all times. Always be safe when dealing with lasers.

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Please note, each wavelength will have a different optical density. For simplicity, it is stated as a range of wavelengths.

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Please note that our face shield design is functionally similar to those available from industry leaders like Pyramex, Grainger, 3M, or at hardware stores, differing primarily in the addition of the laser safety component, which is our unique value proposition.

Having proper personnel with appropriate training and standard operating procedures during the alignment process are proper laser safety amongst several other laser safety controls.

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Question: If my glasses have an optical density of 7+ between 190-385 nm, does that mean they provide that protection to wavelengths beneath 190, such as 110 nm?

Answer: No, by blocking the entire visible light spectrum, you would ensure that no visible light would be passing through the glasses and therefore would have no visibility. Although materials do block multiple wavelengths, blocking all wavelengths of visible light would defeat the purpose of having glasses - because you would not be able to see anything out of them.

Many lasers are within the range of the visible light spectrum of 380 nm (violet) and 740 nm (red). Individuals also need protection from lasers which emit Ultra-Violet light, (lower wavelength than visible light) and infrared light (higher wavelengths than visible light on the magnetic spectrum). It is important to know the wavelength of the laser you’re working with - different lasers require different degrees of protection as outlined in ANSI.

Optical Density (OD) in laser safety is the amount of light attenuated[i] by the lens of the particular wavelength that is being measured. The required OD determined by the World Laser Safety in the USA found in ANSI Z136.1 are dependent upon several factors, including the wavelength of the laser. The standards were created through research based on how different wavelengths have different biological impacts.

I would offer this is the only company I will do business with regarding Class 4 Laser safety. Their service is second to none. Regarding the acrylic face shield only, and its protection, this is absolute. The hardware metal screws are of a poor grade and sheared in half. The controls to elevate the face shield, will not properly hold the face shield elevated, and all plastic components, excepting the acrylic face shield, component plastic used, is some sort of possible styrene and not acceptable for this application . I wear their CE protective goggles in the 445 NM in the event the unit fails, and if you do, the face shield has merit in Class 4.

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The aiming beam is to aid the user in positioning the operating laser beam. Generally, the aiming beam will be low powered and typically red. Do not look directly at any laser including the aiming beam. A common use case for an aiming beam is a laser pointer. For more information on laser safety with an operating beam vs an aiming beam, click here.

Expect excellent service and certifications sent on each pair of specific lenses to the end user client. You cannot get a second chance with high intensity lasers and your eyes. I absolutely trust this firms product, their certifications and their excellent service.