Abstract:
An analysis is made of the parametric frequency conversion processes (addition and tripling) in gas-filled multipass cells. An allowance is made for the losses and the phase shift due to reflection from the cell mirrors. It is shown that the use of a multipass cell can improve the parametric oscillation efficiency by a factor of 30--50 in the wavelength range $\lambda\gtrsim$110 nm for realistic values of the reflectivities of the mirrors. It is found that the necessary condition on the linear part of the total phase advance (which must be a multiple of 2$\pi$) of the interaction in one trip through the cell can be satisfied by a suitable selection of the dispersion law of the phase shift caused by reflection.
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