Symposium EE
Laser Cooling of Solids and Optical Refrigeration


  • Qihua XIONG, Nanyang Technological University, Singapore


  • Christian KLOC, Nanyang Technological University, Singapore
  • Mansoor SHEIK-BAHAE, University of New Mexico, United States
  • Denis SELETSKIY, University of Konstanz, Germany


  • Prof Qihua Xiong, Nanyang Technological University, Singapore
    Tel: +65-6513 8495
    Mailing Address:
    21 Nanyang Link

Scope of Symposium

The field of Laser Cooling of Solids and Optical Refrigeration explores the physics of optically-induced phonon annihilation to induce cooling of condensed matter via a laser input beam. This field has witnessed many exciting progresses in both laser cooling of rare-earth element doped solids and semiconductors in the past few decades. Laser refrigeration of rare-earth doped solids has expanded to include cooling materials containing ytterbium, thulium, erbium and dysprosium dopants in a variety of crystal and glass hosts. The quality and understanding of these cooling materials have has improved to the point that sub-100 K operating temperatures are already being demonstrated to date. Parallel and exciting advances have been concerned with development of radiation-balanced lasers as well as cooling via collisional redistribution of radiation, electroluminescent refrigeration and optomechanical cooling of small structures. Recent successful cooling of semiconductors using II-VI CdS nanoribbons has further stimulated the rising interest.   

In addition to these fundamental developments in materials search, active applied research has already demonstrated cryogenic cooling of small photodetector prototypes and recent exciting new developments in miniature cryocoolers promise its demonstration in the very near future. Potential applications of this technology involve cooling of infrared cameras, low-noise electronics, high-purity germanium gamma ray spectrometers, medical imaging and high temperature superconductors.

 This symposium will keep its main focus on:

  • Up-conversion process facilitated by phonons
  • Electron-phonon couplings in solids
  • Laser cooling of rare-earth doped solids
  • Laser cooling of semiconductors
  • Theory and experimental progress of optical refrigeration
  • High quality rare-earth doped materials synthesis and upconversion studies, including both bulk crystals and other nanocrystals
  • High quality synthesis of semiconductor single crystals, thin films, micro- and nanostructures, and their optical properties
 While at the same time highlighting exciting developments in:
  • Nano scale crystal up-conversion and laser cooling
  • Laser Cooling of dense gases and excitons
  • Opto-mechanical cooling
  • Radiation-balanced lasers
  • Cooling via collisional redistribution of radiation
  • Electro-luminescent refrigeration
  • New solid materials for up-conversion and laser cooling

Invited Speakers

  • Gaurav BAHL, University of Illinois at Urbana-Champaign, United States
  • Zhanghai CHEN, Fudan University, China
  • Yujie DING, Lehigh University, United States
  • Richard EPSTEIN, University of New Mexico, United States
  • Raman KAYSHAP, Polytechnique Montréal, Canada
  • Jacob KHURGIN, John Hopkins University, United States
  • Masaru KUNO, University of Notre Dame, United States
  • Xiaogang LIU, National University of Singapore, Singapore
  • Hooman MOHSENI, Northwestern University, United States
  • Peter PAUZAUSKIE, University of Washington, United States
  • Ali SAYIR, Air Force Office of Scientific Research (AFOSR), United States
  • Denis SELETSKIY, University of Konstanz, Germany
  • Mansoor SHEIK-BAHAE, University of New Mexico, United States
  • Dingyuan TANG, Nanyang Technological University, Singapore
  • Mauro TONELLI, University of Pisa, Italy
  • Martin WEITZ, University of Bonn, Germany
  • Huanjin ZHANG, Shandong University, China
  • Jun ZHANG, Nanyang Technological University, Singapore