By Ioachim Pupeza
Enhancement cavities are passive optical resonators during which continuous-wave laser radiation or pulses of a frequency comb are coherently overlapped, taking into consideration an influence and depth scaling of as much as numerous orders of value. A admired software is the table-top iteration of brilliant, laser-like radiation in spectral areas the place direct laser motion is inefficient or now not on hand in any respect, through intracavity nonlinear optical tactics. in spite of the fact that, to use the complete potential of this system additional development is required.
This thesis covers significant difficulties of enhancement cavities, comparable to discovering boundaries in scaling the circulating strength, measuring hollow space parameters with excessive accuracy, tailoring transverse modes and coupling out radiation generated within the hollow space. exceptional intracavity laser powers have been verified, surpassing past effects via an order of importance. As an software, harmonics of the basic 1040-nm radiation as much as the twenty first order are generated. along with reporting those superb experimental effects, the thesis presents an exceptional creation into the physics of enhancement cavities, supported via greater than a hundred and forty references.
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Baltuska, M. Uiberacker, E. Goulielmakis, R. Kienberger, V. Yakovlev, T. Udem, T. Hänsch, F. Krausz, Phase-controlled amplification of few-cycle laser pulses. IEEE J. Sel. Top. Quantum Electron. 9, 972 (2003) 15. L. Xu, C. Spielmann, A. Poppe, T. Brabec, F. W. Hänsch, Route to phase control of ultrashort light pulses. Opt. Lett. 21, 2008 (1996) 16. T. Brabec, Strong Field Laser Physics (Springer, Cambridge, 2008) 9 For shorter pulses, the saturation intensity is higher, allowing to drive HHG at higher intensities.
In a stable resonator, in which the beam lies in a single plane, this difference is caused by the difference of the effective radius of curvature of the (de)focusing mirrors thus, indicating the angles of incidence on these mirrors. g. be used to adjust the angles of incidence on the curved mirrors so that the Gouy parameters in both directions are equal. In this case all peaks corresponding to modes with the same sum of x and y indices coincide. In particular, this could be used to adjust quasi-imaging in both directions, see Sect.
Here, an octave-spanning frequency comb is employed to generate a beat signal between the mode with the number N and the one with the number 2N . g. by self-phase modulation in a nonlinear crystal. e. ω2N − ω N = ωCE . Controlling ωCE can be done in manifold ways. g. [31]. Recently, a related method was demonstrated in which a composite plate is used to vary this ratio without affecting the repetition rate [32]. g. [19, 20, 33] or by shifting the pumping beam with respect to the cavity mode [34].