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Proceedings Paper

Development of an autocorrelator based on the organic polymer thin film
Author(s): Changsoo Jung; Tae Jun Yu; Han-Bae Bang; Ju-Yeon Lee; Yeung Lak Lee; Clare C. Byeon; Young-Chul Noh; Il Woo Choi; Do-Kyeong Ko; Jongmin Lee
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Paper Abstract

Ultrafast lasers have many applications mainly due to its two properties, the ultrashort pulse width and the ultrahigh intensity. Because the former is the main cause of the latter, it is very important to exactly measure the pulse width of the ultrafast laser. Currently, there are several different kinds of experimental methods to measure the ultrashort pulse width. Among those systems for this measurement, the autocorrelator using the second harmonic generation (SHG) is by far the most simple and basic method. This type of autocorrelators usually uses inorganic crystals, such as BBO, as the SHG medium. The thinner medium is necessary for analyzing the shorter laser pulses. However, the polishing process which is necessary for obtaining the optically good surfaces makes it difficult to reduce the thickness of medium as desired. We present an autocorrelator system which overcomes these shortcomings. Our system is based on the SHG using organic polymer. Polymers can be easily prepared in the form of thin film on the strong substrate through the process of spin casting. Thickness less than 1 m can be obtained without difficulties. Furthermore, due to its high nonlinearity, thin film of polymer can produce the bright second harmonic light. Polyurea was used as the second harmonic generation material of the autocorrelator because it has the pretty good transparency. An autocorrelator system based on the 397nm-thick poled polyurea thin film has been developed and used to measure the pulse width of a home-made Ti:sapphire laser oscillator. Then, the system was compared with that based on a 100 μm-thick BBO crystal, which is widely used. The pulse width of laser beam was measured to be 9.8 fs with the former. The value is believed to be more accurate than that of 7.2 fs measured with the latter.

Paper Details

Date Published: 28 January 2005
PDF: 9 pages
Proc. SPIE 5646, Nonlinear Optical Phenomena and Applications, (28 January 2005); doi: 10.1117/12.576967
Show Author Affiliations
Changsoo Jung, Gwangju Institute of Science and Technology (South Korea)
Tae Jun Yu, Gwangju Institute of Science and Technology (South Korea)
Han-Bae Bang, Inje Univ. (South Korea)
Ju-Yeon Lee, Inje Univ. (South Korea)
Yeung Lak Lee, Gwangju Institute of Science and Technology (South Korea)
Clare C. Byeon, Gwangju Institute of Science and Technology (South Korea)
Young-Chul Noh, Gwangju Institute of Science and Technology (South Korea)
Il Woo Choi, Gwangju Institute of Science and Technology (South Korea)
Do-Kyeong Ko, Gwangju Institute of Science and Technology (South Korea)
Jongmin Lee, Gwangju Institute of Science and Technology (South Korea)


Published in SPIE Proceedings Vol. 5646:
Nonlinear Optical Phenomena and Applications
Qihuang Gong; Yiping Cui; Roger A. Lessard, Editor(s)

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