RP Photonics logo
RP Photonics
Consulting Software Encyclopedia Buyer's Guide

Short address: rpp-con.com

Dr. Paschotta, the founder of RP Photonics, supports your R & D with his deep expertise. Save time and money with efficient support!

Short address: rpp-soft.com

Powerful simulation software for fiber lasers and amplifiers, resonator design, pulse propagation and multilayer coating design.

Short address: rpp-enc.com

The famous Encyclopedia of Laser Physics and Technology provides a wealth of high-quality scientific and technical information.

Short address: rpp-bg.com

In the RP Photonics Buyer's Guide, you easily find suppliers for photo­nics products. As a supp­lier, you can profit from enhanced entries!

Learn on lasers and photonics every day!
VL logo part of the

Bragg Gratings

<<<  |  >>>  |  Feedback

Buyer's Guide

23 suppliers for Bragg gratings are listed.

Your are not yet listed? Get your entry!

Definition: reflecting structures with a periodic refractive index modulation

German: Bragg-Gitter

An optical Bragg grating is a transparent device with a periodic variation of the refractive index, so that a large reflectivity may be reached in some wavelength range (bandwidth) around a certain wavelength which fulfills the Bragg condition

volume Bragg grating

Figure 1: A volume Bragg grating within a glass block reflects an incident beam, if the Bragg condition is met (left-hand side). For a different angle of incidence, hardly any reflection occurs.

Bragg condition for grating reflection

where λ is the vacuum wavelength of light, n the refractive index, θ the propagation angle in the medium relative to the direction normal to the grating, and Λ the grating period. If this condition is met, the wavenumber of the grating matches the difference of the wavenumbers of the incident and reflected waves.

Other wavelengths are only weakly affected by the Bragg grating, except for some side lobes in the reflection spectrum. Similarly, the reflection can nearly totally disappear when the angle of incidence is modified (see Figure 1).

Calculator for the Bragg Condition

Refractive index:
Grating period: calc
Angle: calc

After you have modified some values, click a "calc" button to recalculate the field left of it.

Around the Bragg wavelength, even a weak index modulation can be sufficient for achieving nearly total reflection, if the grating is sufficiently long. Due to the wavelength dependence of reflection and transmission, a Bragg grating can serve as an optical filter.

Examples of Optical Bragg Gratings

See also: Bragg mirrors, fiber Bragg gratings, optical filters

Category: general optics

How do you rate this article?

Your general impression: don't know poor satisfactory good excellent
Technical quality: don't know poor satisfactory good excellent
Usefulness: don't know poor satisfactory good excellent
Readability: don't know poor satisfactory good excellent

Found any errors? Suggestions for improvements? Do you know a better web page on this topic?

Spam protection: (enter the value of 5 + 8 in this field!)

If you want a response, you may leave your e-mail address in the comments field, or directly send an e-mail.

If you like our website, you may also want to get our newsletters!


Have you seen the
RP Photonics Buyer's Guide?

It lists many hundreds of suppliers for photonics products, and is just one mouse click away from the extremely popular Encyclopedia of Laser Physics and Technology:

Our Buyer's Guide is what you need:

And surely you will remember where to find this useful resource again!

Suppliers: get your free entries, and enhanced visibility with paid entries.

The Encyclopedia in Book Form

cover of print encyclopedia

The two-volume print version of the encyclopedia would deserve a place in your institute or group library!

Click on the image to get to Wiley-VCH.

This resource is provided by
RP Photonics Consulting GmbH.

You can get technical consulting from the author, Dr. Rüdiger Paschotta.

Free Fiber Optics Software!

RP Fiber Calculator software

RP Fiber Calculator – a convenient tool for calculations on optical fibers -- offered for free
let us celebrate the 10-year anniversary of RP Photonics!

Read a random article every day in order to steadily learn about photonics!

Resonator Design Software

RP Resonator – do you know a more flexible resonator design software?

laser resonator design