Femtosecond pulse stretching in microscope objectives used for micro/nanomachining

Nageswara Rao Tadepalli, Dennis Alexander, David Doerr, Jianchao Li, Haifeng Zhang

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Femtosecond laser pulses are stretched when they pass through an optical microscope objective used for laser machining. The question that must be answered is how much does the pulse stretch passing through the objective. Stretching of pulses would be more prominent in the case of ultrashort laser pulses (̃9 fs). In this article, a study was performed to measure the final pulse duration for a 9 fs laser pulse passing through a microscope objective (Edmund Achromatic Objective Micro 60X DIN, 0.85 numerical aperture). Results indicate that a 9 fs pulse is stretched to 62 fs (i.e., a factor of 6) after passing through the microscope objective.

Original languageEnglish (US)
Pages (from-to)270-272
Number of pages3
JournalJournal of Laser Applications
Issue number4
StatePublished - 2005


  • Femtosecond
  • Micromachining
  • Ultrashort pulse stretching

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Biomedical Engineering
  • Instrumentation


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