What is optical density in laser?

What is optical density in laser?

Optical Density (OD) is a measure of the attenuation of energy passing through a filter. The higher the OD value, the higher the attenuation and the greater the protection level. In other words, OD is a measure of the laser energy that will pass through a filter.

Which optical density of safety glasses offers the highest degree of protection from a Nd YAG laser?

high OD 7
The high OD 7 provides the highest level of nd yag laser protection with attenuation of 10,000,000X at 1064nm & 190-532nm. The L ratings demonstrate testing of the ability of the laser glasses to withstand a direct laser hit.

How do I choose laser goggles?

Quick tips on how to select the proper protective eyewear

1. Know your laser’s wavelength.
2. Determine the protection level needed based on your laser’s output parameters, or look for the recommended Optical Density (OD).
3. Select a filter whose specifications match the above information.
4. Find a frame that’s right for you.

How is optical density calculated?

Optical density is defined by the equation: Density = log 10 I 0 * I 1 , where I0 is the intensity of visible light incident upon a small area of the film and I1 is the intensity of light transmitted by that region of the film (Fig. 103).

What is the wavelength of co2 laser?

The CO2 laser is an invisible laser with an infrared wavelength of 10,600 nm. The optical absorption coefficient for water at this wavelength is approximately 800 cm-1, which is significantly greater than that of Ho:YAG laser.

How do you calculate optical density?

What is the optical density of your laser filters?

In laser applications, optical density is usually specified in ranges. For instance, our KG5 filter covers three ranges of wavelengths, each at a specific OD: This means that for all wavelengths between (and including) 900 – 1,000 nanometers, the optical density is at least 5.

What is the optical density of 5?

So, for an optical density of 5, OD = 5 and T = 0.00001, or 0.001%: This means that, for a lens with an optical density of 5 for a specific wavelength, only 0.001% (1/10,000) of the light at that wavelength will pass through that lens. In laser applications, optical density is usually specified in ranges.

How do I calculate the power density of my laser?

Now calculate the power density of the beam by dividing the power by the area of the beam. Next, refer to the table of protection levels in EN 207 ( click here ). Select the column corresponding to the wavelength range of your laser, either 180-315nm, >315-1400nm or >1400-10000nm.

How do I calculate the OD required for laser safety glasses?

For a definitive calculation of the OD required by your laser equipment, consult a Certified Laser Safety Officer or professionals at a laser safety glasses company. This is an online calculator from the Laser Institute of America that can simplify the estimating process, and it is not definitive either.