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Laser Safety Guide


Our laser safety goggles are made of high quality polycarbonate with high class on laser pretection for huam eyes. We have several professional series safety goggles for typical wavelength and compatible with several frame styles. Customer can match the right series goggles according to their purpose and also can choose the frame style they like.
All laser safety goggles approved by  Stand: EN 207:2009+AC:2011, EN 207:2017 (Europe)  and Stand: ANSI Z136.1 (USA).
The laser safety goggles can be used on laser manufacturing, laser collimation calibration project, laser cosmetology, medical treatment etc.

Why we need wear laser safety goggles?

Eyes are very important sense organ for human but they are weak. They can be injured by mang kinds of lights in daily life.
Laser light wavelength less than 400nm can hurt the cornea;
Laser wavelength between 400nm-1400nm can get through the eyes lens and hurt the retina, it is very dangerous;
Laser wavelenth higher than 1400nm is relatively safe, but it still hurt eyes if exposed to high power laser enviroment.
Because of evolution, now human eyes lost the sense for violet and infrared laser light and the laser light wavelength higher than 940nm is totally invisible. Invisible light still can injure our eyes. The 400nm-1400nm laser light and go through human eyes and injire retina easily.For example, Most of high power laser cutting machine use 1064nm-1100nm invisible laser which cause more serious injire than visible laser light. We must protect our eyes when we operating it.

Even at lower power output levels, it is possible to cause irreversible ocular injury from a single accidental exposure to a direct or reflected laser beam, depending on the wavelength, output and exposure duration. Laser safety can prevent damage to equipment as well. An important factor in determining damage potential is irradiance, the power per area, expressed in watt/cm2.

What is "Optical Density (OD)" and "Visible Light Transmittance (VLT)" ?

Usually we will see an OD number and VLT number on laser safety goggles or specification.

  • Optical density (OD) is the attenuation of light that passes through an optical filter. The higher the OD value the higher the attenuation. The mathematic expression of optical density is the logarithm to the base ten of the reciprocal of the transmittance and is given by the following equation: OD = -log10 (T). OD is a measure that indicates how many decimal places the transmission shifts at the required wavelength. OD is a unitless function. An OD of 2 allows 0.01% transmission, while OD 4 allows 0.0001% of transmission photon.
  • The attenuation of light by a filter in the visible spectrum is defined as the visible light transmission (VLT) or luminous transmittance. As described in the ANSI standard Z136.7 for Testing and Labeling of Laser Protective Equipment, VLT is determined in relation to a standard illuminant. It is evaluated according to the spectral sensitivity of the eye to daylight-adapted (photopic) or night-adapted (scotopic). If the measured VLT value is less than 20%, the user should ensure that their working environment receives additional illumination. With a low VLT and inadequate illumination, the color vision is restricted and the spectral sensitivity of the eyes moves towards the shorter wavelengths
How to select laser eyewear?

There is an ever-expanding array of complex and sophisticated laser systems in use today. For laser personnel, Laser Safety Officers (LSOs) in material processing, military, medical, research and development, applications demand high-performance safety eyewear options. When selecting the most appropriate laser protective eyewear, LSOs need to consider the working environment, viewing conditions, operational and performance specifications of the laser as well as beam delivery systems.

The ultimate goal in selecting laser eye protection is to provide comfortable and stylish eyewear that laser personnel will wear with protection levels (optical densities) that properly reduce potentially hazardous laser exposure to levels at or below maximum permissible exposure (MPE) levels.

Our laser protective eyewear is available in a variety of technologies such as glass, polycarbonate, and nanospec (thin-film-coated glass). Filters are available using absorptive or reflective dielectric thin-film technology. Absorptive lens filters are made using high-impact, high-optical quality polycarbonate or glass materials. Light absorption at a specific laser wavelength is expressed in terms of optical density (OD). It is calculated by the following equations:

OD = -log10T = -log10(I/I) = log10 (1/T )

Where:

T = Transmittance at the wavelength of interest

Io = Intensity of incident beam

I = Intensity of transmitted beam

Quick tips on how to select the proper protective eyewear:

  • Know your laser’s wavelength.
  • Determine the protection level needed based on your laser’s output parameters, or look for the recommended Optical Density (OD). This can be found in your laser manual.
  • Select a filter whose specifications match the above information. Choose one that offers the highest visibility (VLT).
  • Find a frame that’s right for you. For prescription options, choose a fit-over frame or click here for more information on prescription laser safety lenses.

Choosing the right laser safety protection can be challenging. If you have any questions, feel free to send us an email, give us a call at +86-18680683948. One of our laser safety experts will be happy to help you find the protection you need.

What is the difference between polycarbonate filter and glass filter?

FreeMascot offers the most advanced collection of polycarbonate or glass laser safety eyewear filters. All filters are produced at our advanced glass processing facility according to exacting standards. With over sixteen filters and nine filter frames, our selection of laser safety eyewear is unparalleled. We have the capacity to develop custom polycarbonate or glass filters specifically to your application requirements. 

Here are general difference between polycarbonate filters and glass filters:

Polycarbonate filters Glass filters
  • Lightweight
  • Cost-effective
  • Offered in a large variety of frame styles
  • Best suited for low-mid power density laser applications
  • Some are impact resistant, ANSI Z87 compliant
  • Superior optical properties
  • Improved visible light transmission (VLT)
  • Excellent color balance
  • High level of protection over wide range

 

What kind of filter frames we can offer??

Now we have nine filter frames compatible different filters, please check following details and choose the most appropriate frame for your purpose: 

  Frame Style 1 Frame Style 2 Frame Style 3
Frame Style       
Frame Features
  • Large lens size for a greater field of view
  • Soft temple earpieces for comfort
  • Duoflex temples – height and angle adjustable
  • Sporty style and lightweight
  • Soft temples earpieces for comfort
  • Maximum comfort and performance
  • Innovative design with optimal field of view
  • Lightweight and comfortable
  • Fits over prescription eyewear
Compatible Filter Type  

Type 1, Type 2, Type 3, Type 3G, Type 3R, Type 4, Type 4G, Type 5Type 5G, Type 6, Type CO2, Type IPL, Type UB

 

Type 1, Type 2, Type 3, Type 3G, Type 3R, Type 4, Type 4G, Type 5Type 5G, Type 6, Type CO2, Type IPL, Type UB

 

Type 1, Type 2, Type 3, Type 3G, Type 3R, Type 4, Type 4G, Type 5Type 5G, Type 6, Type CO2, Type IPL, Type UB

  Frame Style 4 Frame Style 5 Frame Style 6
Frame Style      
Frame Features
  • Lightweight and fit-over style
  • Compatible with myopia glasses
  • Maximum comfort and performance

  • Large lens for a greater field of view
  • Lightweight for optimal comfort
  • Flexible/adjustable rubber temples
  • Fits over most prescription eyewear
 
Compatible Filter Type  

Type 1, Type 2, Type 3, Type 3G, Type 3R, Type 4, Type 4G, Type 5Type 5G, Type 6, Type CO2, Type IPL, Type UB

 

Type 1Type 2Type 3Type 3GType 3RType 4Type 4G, Type 5Type 5GType 6Type CO2Type IPLType UB

 

Type 1Type 2Type 3Type 3GType 3RType 4Type 4G, Type 5Type 5GType 6Type CO2Type IPLType UB

  Frame Style 7 Frame Style 8 Frame Style 9
 Frame Style    
Frame Features      
Compatible Filter Type  

Type 1Type 2Type 3Type 3GType 3RType 4Type 4G, Type 5Type 5GType 6Type CO2Type IPLType UB

   

Type 3,  Type 4Type IPL

What kind of laser safety eyewear we can offer?
FreeMascot offers the most advanced collection of polycarbonate or glass laser safety eyewear filters. We have the capacity to develop custom polycarbonate or glass filters specifically to your application requirements. We are able to bond or laminate two (or more) types of filters together to extend the spectral protection range of a single type of eyewear filter to cover a broader range of laser wavelengths. Please contact our customer service to get more details.
Here are particular laser safety eyewear we are producing now:
 
Filter Type Filter Material For Typical Laser Typical Wavelength (nm) Default O.D. V. L.T(%) Available Frame Style

T-UB

(190-490nm)

Polycarbonate  UV, Blue 405nm, 445nm, 450nm, 473nm 4+, 6+ 50% Style 1, 2, 3, 4, 5, 6, 7

T-1

(190-550nm) 

Polycarbonate 

KTP Nd: YAG

Argon

Semi-Conductor

532nm

514nm, 515nm, 520nm

4+, 6+, 8+  30%  Style 1, 2, 3, 4, 5, 6, 7

T-2

(600-760nm)

Polycarbonate 

He-Ne

Semi-Conductor

632nm, 635nm, 638nm, 660nm

4+, 6+ 30%  Style 1, 2, 3, 4, 5, 6, 7

T-3

(190-450nm & 800-1100nm)

Polycarbonate 

Nd: YAG

Semi-Conductor

Fiber  Laser

405nm, 445nm, 450nm

808nm, 980nm

1064nm, 1070nm

4+, 6+, 8+ 60%  Style 1, 2, 3, 4, 5, 6, 7

T-3G

(190-550nm & 800-1100nm)

Polycarbonate 

Nd: YAG

Semi-Conductor

Fiber  Laser

405nm, 445nm, 450nm, 532nm

808nm, 980nm

1064nm, 1070nm, 1080nm, 1100nm
 4+, 6+  30%  Style 1, 2, 3, 4, 5, 6, 7

T-3R

           

 T-4

(190-450nm & 800-1700nm)

Polycarbonate 

Nd: YAG

Semi-Conductor

Fiber  Laser

808nm, 980nm

1064nm, 1070nm

1080nm,1100nm
 4+, 6+  35%  Style 1, 2, 3, 4, 5, 6, 7

T-4G

           

 T-5

(190-420nm & 850-1300nm)

Polycarbonate 

Nd: YAG

Fiber Laser

1064nm,1070nm

 1080nm,1100nm
 4+  28%  Style 1, 2, 3, 4, 5, 6, 7

 T-5G

(190-550nm & 850-1300nm)

Polycarbonate 

Nd: YAG

Fiber Laser

 532nm, 980nm,

1064nm,1070nm,

1080nm, 1100nm

 4+  10%  Style 1, 2, 3, 4, 5, 6, 7

 T-6

(190-380nm & 750-860nm)

Polycarbonate   Infrared Laser  808nm, 810nm, 830nm  5+  60%  Style 1, 2, 3, 4, 5, 6
T-7            
T-8            
 T-BR Polycarbonate   Violet, Blue, Red

 445nm, 450nm, 473nm,

 635nm, 650nm

 4+  30%  Style 1, 2, 3, 4, 5, 6, 7
T-BGR Polycarbonate 

Violet, Blue, Green,

Red,

 445nm, 450nm, 473nm,

515nm, 520nm,532nm,

635nm, 660nm

  8%  Style 1, 2, 3, 4, 5, 6, 7

T-IPL

(190-2000nm)

Polycarbonate 

Violet, Visible Light,

Infrared

190nm-2000nm 4+ 30%  Style 1, 2, 3, 4, 5, 6, 7

T-CO2

(5000-11000nm)

Polycarbonate  Infrared 10600nm 4+ / 5+ 20%  Style 1, 2, 3, 4, 5, 6, 7