Femtosecond pulse shaping using a liquid–crystal display: Applications to depth profiling analysis
2005; American Institute of Physics; Volume: 76; Issue: 8 Linguagem: Inglês
10.1063/1.1994897
ISSN1527-2400
AutoresOta Samek, Vanja Hommes, Roland Hergenröder, S. V. Kukhlevsky,
Tópico(s)Advanced Optical Sensing Technologies
ResumoWe report on a beam shaping technique for femtosecond laser pulses based on a liquid-crystal display. The system is capable of modifying femtosecond Gaussian beams to a flattop beam. A pattern projected onto liquid-crystal display modifies the incoming Gaussian beam intensity so that flattop intensity profile is obtained. The process is monitored online using a charge-coupled device camera so that the intensity distribution of each pulse is known. An experimental example of the depth profile of a Cr layer on a Si substrate obtained using such a modified beam is presented.
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