A prism compressor is an optical device used to shorten the duration of a positively chirped ultrashort laser pulse by giving different wavelength components a different time delay. It typically consists of two prisms and a mirror. Figure 1 shows the construction of such a compressor. Although the dispersion of the prism material causes different wavelength components to travel along different paths, the compressor is built such that all wavelength components leave the compressor at different times, but in the same direction. If the different wavelength components of a laser pulse were already separated in time, the prism compressor can make them overlap with each other, thus causing a shorter pulse.
Prism compressors are typically used to compensate for dispersion inside Ti:sapphire modelocked lasers. Each time the laser pulse inside travels through the optical components inside the laser cavity, it becomes stretched. A prism compressor inside the cavity can be designed such that it exactly compensates this intra-cavity dispersion. It can also be used to compensate for dispersion of ultrashort pulses outside laser cavities.
Prismatic pulse compression was first introduced, using a single prism, in 1983 by Dietel et al.[1] and a four-prism pulse compressor was demonstrated in 1984 by Fork et al.[2] Additional experimental developments include a prism-pair pulse compressor[3] and a six-prism pulse compressor for semiconductor lasers.[4] The multiple-prism dispersion theory, for pulse compression, was introduced in 1982 by Duarte and Piper,[5] extended to second derivatives in 1987,[6] and further extended to higher order phase derivatives in 2009.[7]
An additional compressor, using a large prism with lateral reflectors to enable a multi-pass arrangement at the prism, was introduced in 2006.[8]
^W. Dietel, J. J. Fontaine, and J. C. Diels, "Intracavity pulse compression with glass: a new method of generating pulses shorter than 60 fs," Opt. Lett.8, 4-6 (1983).
^R. L. Fork, O. E. Martinez, and J. P. Gordon, "Negative dispersion using pairs of prisms", Opt. Lett.9, 150-152 (1984).
^J. C. Diels, W. Dietel, J. J. Fontaine, W. Rudolph, and B. Wilhelmi, Analysis of a mode-locked ring laser: chirped-solitary-pulse solutions, J. Opt. Soc. Am. B2, 680-686 (1985).
^L. Y. Pang, J. G. Fujimoto, and E. S. Kintzer, Ultrashort-pulse generation from high-power diode arrays by using intracavity optical nonlinearities, Opt. Lett.17, 1599-1601 (1992).
^F. J. Duarte and J. A. Piper, "Dispersion theory of multiple-prism beam expander for pulsed dye lasers," Opt. Commun.43, 303-307 (1982).
^F. J. Duarte, Generalized multiple-prism dispersion theory for pulse compression in ultrafast dye lasers, Opt. Quantum Electron.19, 223-229 (1987).
^
F. J. Duarte, Generalized multiple-prism dispersion theory for laser pulse compression: higher order phase derivatives, Appl. Phys. B96, 809-814 (2009).
^S. Akturk, X. Gu, M. Kimmel, and R. Trebino,"Extremely simple single-prism ultrashort- pulse compressor" Opt. Exp.14, 10101-10108 (2006), PDF.
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