RP Photonics logo
RP Photonics
Encyclopedia
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
Virtual
Library

Gires–Tournois Interferometers

<<<  |  >>>  |  Feedback

Buyer's Guide

The ideal place to find suppliers for photonics products: high-quality information, simple and fast, respects your privacy!

3 suppliers for Gires-Tournois interferometers are listed.

Your are not yet listed? Get your entry!

Ask RP Photonics for advice on how to design a Gires–Tournois interferometer or a different kind of dispersion-compensating device.

Acronym: GTI

Definition: linear optical resonators used for introducing chromatic dispersion

German: Gires-Tournois-Interferometer

Categories: photonic devices, light pulses, optical resonators

How to cite the article

GTI

Figure 1: Schematic setup of a Gires–Tournois interferometer.

A Gires–Tournois interferometer is an optical standing-wave resonator similar to Fabry–Pérot interferometer, which however is operated in reflection and designed for generating chromatic dispersion. The front mirror is partially reflective, whereas the back mirror has a high reflectivity. If no losses occur in the resonator, the power reflectivity is unity at all wavelengths, but the phase of the reflected light is frequency-dependent due to the resonance effect, causing chromatic dispersion. The phase change of reflected light and the dispersion (including group delay dispersion and higher-order dispersion) change periodically with optical frequency, if material dispersion is negligible. There is no second-order dispersion exactly on-resonance or anti-resonance, and positive or negative dispersion between these points.

Ideally, the GTI is operated near a maximum or minimum of the GDD, and the usable bandwidth is some fraction (e.g. one-tenth) of the free spectral range, which is inversely proportional to the resonator length. In the time domain, this means that the pulse duration needs to be well above the round-trip time of the GTI. The maximum magnitude of GDD scales with the square of the resonator length.

dispersion of a GTI

Figure 2: Wavelength-dependent group delay dispersion of a GTI made of a 5-μm thick silica layer on a high reflector. The diagram has been made with the software RP Coating.

Tunable dispersion can be obtained with a variable air gap between the mirrors, which however must be carefully stabilized to avoid unwanted drifts. More stable but in general not tunable GDD can be generated with monolithic designs, based e.g. on thin films of dielectric media such as TiO2 and SiO2, particularly for use in femtosecond lasers.

The main drawbacks of the GTI are the fundamentally limited bandwidth (proportional to the square root of the given magnitude of GDD) and the limited amount of control of higher-order dispersion. Dispersive mirrors with significantly broader optical bandwidth can be designed as chirped mirrors.

Bibliography

[1]F. Gires and P. Tournois, “Interferometre utilisable pour la compression d'impulsions lumineuses modulees en frequence”, C. R. Acad. Sci. Paris 258, 6112 (1964)
[2]B. Golubovic et al., “Double Gires–Tournois interferometer negative-dispersion mirrors for use in tunable mode-locked lasers”, Opt. Lett. 25 (4), 275 (2000)
[3]Analysis of a GTI with the RP Coating software

See also: interferometers, Fabry–Pérot interferometers, dispersion, dispersion compensation, optical resonators

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
Comments:

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!

cover of SPIE Field Guide cover of SPIE Field Guide cover of SPIE Field Guide

Dr. Paschotta, author of this encyclopedia, has also published three books in the SPIE Field Guide series:

- Field Guide to Lasers

- Field Guide to Laser Pulse Generation

- Field Guide to Optical Fiber Technology

You can order these books on the SPIE website – just click on one of the images.

arrow
Bragg mirror

A femtosecond pulse hits a Gires--Tournois interferometer (GTI).

This diagram has been made with the RP Coating software.

– Show all banners –

– Get your own banner! –