Alternative technique for laser cooling with superradiance

Journal Article · Sat Jan 15 00:00:00 EST 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.83.013404· OSTI ID:21529094

Nemova, Galina ^[1]; Kashyap, Raman ^[1]

---

1. Advanced Photonics Concepts Laboratory, Department of Engineering Physics, Ecole Polytechnique de Montreal, P.O. Box 6079, Station Centre-ville, Montreal (Canada)

We present a theoretical scheme for laser cooling of rare-earth-doped solids with optical superradiance (SR), which is the coherent, sharply directed spontaneous emission of photons by a system of laser-excited rare-earth ions in the solid-state host (glass or crystal). We consider an Yb{sup +}-doped ZnF{sub 4}-BaF{sub 2}-LaF{sub 3}-AlF{sub 3}-NaF (ZBLAN) sample pumped at a wavelength 1015 nm, with a rectangular pulsed source with a power of {approx}433 W and a duration of 10 ns. The intensity of the SR is proportional to the square of the number of excited ions. This unique feature of SR permits an increase in the rate of the cooling process in comparison with the traditional laser cooling of the rare-earth-doped solids with anti-Stokes spontaneous incoherent radiation (fluorescence). This scheme overcomes the limitation of using only low phonon energy glasses for laser cooling.

• OSTI ID: 21529094
• Journal Information: Physical Review. A, Vol. 83, Issue 1; Other Information: DOI: 10.1103/PhysRevA.83.013404; (c) 2011 American Institute of Physics; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
74 ATOMIC AND MOLECULAR PHYSICS
ALUMINIUM FLUORIDES
BARIUM FLUORIDES
COOLING
CRYSTALS
DOPED MATERIALS
FLUORESCENCE
GLASS
IONS
LANTHANUM FLUORIDES
PHONONS
PHOTONS
RARE EARTHS
SODIUM FLUORIDES
SOLIDS
SUPERRADIANCE
WAVELENGTHS
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
BARIUM COMPOUNDS
BOSONS
CHARGED PARTICLES
ELEMENTARY PARTICLES
ELEMENTS
EMISSION
ENERGY-LEVEL TRANSITIONS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
LANTHANUM COMPOUNDS
LUMINESCENCE
MASSLESS PARTICLES
MATERIALS
METALS
PHOTON EMISSION
QUASI PARTICLES
RARE EARTH COMPOUNDS
SODIUM COMPOUNDS
STIMULATED EMISSION