Light recycling characteristics of ultra-bright lamps

Asher Malul, Doron Nakar, Daniel Feuermann, Jeffrey M. Gordon

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


The brightness of many lamps, and hence the attainable power density at the target application, can be enhanced by recycling light back into the lamp's radiant zone. We report measurements of the effectiveness, spectral characteristics and modified plasma brightness maps that result from light recycling with a specular hemispherical mirror in commercial 150 W ultra-bright Xenon short-arc discharge lamps. Lamp brightness can be increased by up to 70% for certain spectral windows and plasma arc regions. However, lamp geometry reduces overall light recycling effectiveness to about half this value. This study was motivated by biomedical and high-flux furnace applications where the full spectrum of lamp emissions can be exploited, heightened brightness allows a broader range of procedures, and the design of the affiliated optical systems is contingent upon how plasma radiometric characteristics are altered by photon regeneration.

Original languageEnglish
Title of host publicationNonimaging Optics and Efficient Illumination Systems IV
StatePublished - 2007
Externally publishedYes
EventNonimaging Optics and Efficient Illumination Systems IV - San Diego, CA, United States
Duration: 26 Aug 200727 Aug 2007

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceNonimaging Optics and Efficient Illumination Systems IV
Country/TerritoryUnited States
CitySan Diego, CA


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