Femtosecond Technology for Technical and Medical by Friedrich Dausinger, Friedemann Lichtner, Holger
By Friedrich Dausinger, Friedemann Lichtner, Holger Lubatschowski
Femtosecond know-how, with its ultrashort mild pulses, types an leading edge laser expertise that may be used for various technical purposes. This monograph provides a finished review of the rules and purposes of femtosecond lasers, specially as utilized to drugs and to creation know-how. the rules and contours of such femtosecond expertise are defined, and the lasers, structures and applied sciences which are required in those power fields of software are investigated. the benefits and difficulties of ultrashort laser pulses are mentioned in additional element within the context of purposes within the micro-machining of technical fabrics comparable to drilling, floor structuring and slicing; in clinical use resembling dental, ophthalmologic, neurological and otolaryngological functions; in metrology; and within the iteration of x-rays. safeguard facets also are considered.
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Sample text
Henrich, R. Wallenstein: Passive modelocked 21 W femtosecond Yb:YAG laser with 124 MHz repetition-rate, in OSA Tech. Dig. Ser. (Opt. Soc. Am. 2004) 24 [21] J. Kleinbauer, R. Reuter, R. Knappe, R. Wallenstein: High power, high repetition-rate picosecond Nd:YVO4 regenerative amplifier, in Tech. Dig. CA3-2-TUE (Conf. Lasers and Electrooptics 2003) 24 [22] R. Knappe, B. Henrich, T. Herrmann, A. Nebel: High power Nd:YVO4 regenerative laser amplifier with 100 kHz repetition-rate, in Tech. Dig. de Abstract.
Maybe even more important, employing such systems for applications such as micromachining requires extended processing times, since the repetition rate is typically limited to below 5 kHz. To overcome most of these deficiencies, many research activities in the last few years have concentrated on the investigation of alternative laser materials for high-power ultrashort pulse generation. Yb-doped materials such as Yb:YAG and Yb:KGW are promising candidates for this purpose, since unlike Ti:sapphire they can be pumped directly with high-power diode lasers, leading to a significantly reduced complexity of the overall system.
As a consequence, laser resonators with long cavity roundtrip times have to be employed to prevent the respective system from Q-switching [15, 16]. This makes the systems vulnerable to mechanical and environmental changes and perturbations. One way around this problem is to employ a different mode locking scheme that does not exhibit this limitation. A promising candidate, which fulfills this requirement, is additive pulse mode locking (APM). APM, on the other hand, relies on the interferometric length stabilization of the coupled cavities, as shown in a previous section.