Optical parametric generation at extremely low pump irradiance in a long periodically poled Lithium Niobate

Shy Acco*, Pinhas Blau, Shaul Pearl, Ady Arie

*Corresponding author for this work

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

Abstract

Optical parametric generator (OPG) is a very attractive optical down-conversion configuration since it is a single pass process and no cavity mirror's alignment is required. Thus the system configuration is much more simple and robust. Traditionally, OPG processes were demonstrated using a pump source with a pulse length of the order of picoseconds or less. This is because GW/cm2 order of magnitude pump irradiance was required to excite an OPG process, and such irradiance in nanosecond long pulses commonly damages the non-linear crystal. The introduction of periodically poled crystals with high non-linear coefficients has significantly lowered the threshold for parametric processes. This progress in non-linear crystals enables exciting OPG processes at less than 100MW/cm2 irradiance, using nanoseconds long pulses from Q-switched lasers. We present an OPG with a threshold of less than 10 MW/cm2 using an 80 mm long Periodically Poled Lithium Niobate (PPLN) non-linear crystal. High signal conversion efficiency and high power were obtained at 25 nanosecond pulse length, 10 kHz repetition rate pumping without damaging the crystal. Theoretical approaches for explaining this OPG regime are discussed.

Original languageEnglish
Title of host publicationNonlinear Frequency Generation and Conversion
Subtitle of host publicationMaterials, Devices, and Applications VI
DOIs
StatePublished - 2007
EventNonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VI - San Jose, CA, United States
Duration: 23 Jan 200724 Jan 2007

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6455
ISSN (Print)0277-786X

Conference

ConferenceNonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VI
Country/TerritoryUnited States
CitySan Jose, CA
Period23/01/0724/01/07

Keywords

  • Optical parametric generation
  • Parametric noise
  • Periodically poled crystals

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