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Keywords beginning with R

On this page you find all our encyclopedia articles on keywords beginning with "R". Indented lines indicate articles on related topics. Further below, you find the acronyms.

(See also: list of products for the letter R)

r.m.s. values → power spectral density

Rabi frequency → Rabi oscillations

Rabi oscillations


radiance scaling of lasers → power scaling of lasers

radiant energy

radiant exitance

radiant flux

radiant intensity

radiant power → radiant flux

radiant sensitivity → responsivity

radiation-balanced lasers

radiation modes → cladding modes

radiation pressure

radiative lifetime

radio and microwave over fiber

radioluminescence → luminescence

radiometers → radiometry


radius of laser beam → beam radius

Raman amplifiers

Raman effect → Raman scattering

Raman fiber lasers → Raman lasers

Raman gain

Raman lasers

Spotlight 2012-03-12: New Raman lasers

Raman scattering

Spotlight 2018-03-05: Dependence on Raman conversion on the optical bandwidth

Spotlight 2010-03-03: Thresholds for nonlinear effects in fiber amplifiers

Case study: stimulated Raman scattering in a multimode fiber

Case study: stimulated Raman scattering in a fiber amplifier

Raman self-frequency shift → solitons

Raman spectroscopy

range finding → distance measurements with lasers

rare-earth-doped fibers

Spotlight 2016-05-12: Measurement of absorption spectra of active fibers: not as easy as one might think!

rare-earth-doped gain media

Spotlight 2014-06-27: Shortages of rare earth materials – a problem for photonics?

rate equation modeling

Spotlight 2008-10-20: Rate equations – an example for stiff sets of differential equations

rational harmonic mode locking → active mode locking

ray optics → geometrical optics

ray transfer matrix → ABCD matrix

Rayleigh length

Rayleigh scattering

reabsorption in gain media → four-level and three-level gain media

reciprocity method

recirculating fiber loops

recoil limit

red–green–blue sources → RGB sources

red lasers

reference cavities

references surfaces → optical flats


reflection coefficient of an interface → Fresnel equations

reflection gratings → diffraction gratings



refractive index

refractive index fluids → index matching fluids

regenerative amplifiers

Case study: regenerative amplifier

regenerative mode locking → active mode locking

regular reflection → specular reflection

relative intensity noise

Spotlight 2018-06-08: Understanding intensity noise

relaxation oscillations

remote ranging → distance measurements with lasers

repetition rate → pulse repetition rate

residual absorption → absorption

residual jitter → timing jitter

resonant cavity → optical resonators

resonant frequency doubling

resonant second-harmonic generation → resonant frequency doubling

resonator bandwidth → resonator modes

resonator design

Spotlight 2017-11-02: Gaussian apertures in resonator models: not only for exotic lasers, but also for gain guiding

Spotlight 2011-06-10: Are compact resonators more stable?

Case study: resonator with automatic optimization

resonator mode spacing → free spectral range

resonator modes

resonators → optical resonators



retarders → retardance

retroreflecting prisms → corner cube prisms


return loss

RGB sources

ring lasers

ring resonators

rod-in-tube method → fiber fabrication

rod lasers

rod lenses

rotating disc choppers → optical choppers

rotating slit profilers → beam profilers

rubber band model → frequency combs

ruby lasers

rugate filters

Case study: rugate filters

Acronyms beginning with R

RBL = radiation-balanced laser

RF over fiber = radio over fiber → radio and microwave over fiber

RFoF = radio over fiber → radio and microwave over fiber

RGB source = red–green–blue source

RIN = relative intensity noise

… and if you need any more help on such topics, consider to use the consulting services of RP Photonics Consulting GmbH! There is a variety of various services available in topical areas such as lasers, amplifiers, nonlinear optics, fiber optics, ultrashort pulses, multilayer mirrors, noise and fluctuations, and other topics in photonics and optoelectronics.