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.
- Ultrashort pulse stretching
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Biomedical Engineering