Enter the optical power that propagates away from grating and the optical power incident on the grating into the calculator to determine the Diffraction Efficiency.

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## Diffraction Efficiency Formula

The following formula is used to calculate the Diffraction Efficiency.

**Ediff = Pm / Pinc *100**

- Where Ediff is the Diffraction Efficiency (%)
- Pm is the optical power that propagates away from grating
- Pinc is the optical power incident on the grating

## How to Calculate Diffraction Efficiency?

The following two example problems outline how to calculate the Diffraction Efficiency.

**Example Problem #1:**

- First, determine the optical power that propagates away from grating. In this example, the optical power that propagates away from grating is given as 50.
- Next, determine the optical power incident on the grating. For this problem, the optical power incident on the grating is given as 70.
- Finally, calculate the Diffraction Efficiency using the equation above:

Ediff = Pm / Pinc *100

Inserting the values from above and solving the equation:

Ediff =50 / 70 *100 = 71.14 (%)

**Example Problem #2: **

Using the same process as above, first define the variables required by the formula. In this case, these values are:

optical power that propagates away from grating = 30

optical power incident on the grating = 80

Entering these values yields:

Ediff = 30/ 80 *100 = 37.5 (%)