Nonlinear Cherenkov diffraction of femtosecond laser pulses in irregular domain structures of strontium tetraborate
Cerenkov nonlinear diffraction of femtosecond laser pulses in irregular domain structures of strontium tetraborate is investigated [2]. Angular chirp within the SH cross-section is observed (Fig.1_2). The results of calculations are in good agreement with experimental dependences.
Fig. 2_1. (a) Measured and (b) calculated angular dependence of SH spectral intensity.
As a result, tunable second harmonic generation is implemented in the tuning range of a femtosecond Ti: sapphire laser. These types of phase matching are used in autocorrelation measurements of femtosecond laser pulse length [3, 4]. The results obtained open new possibilities for creating broadband and tunable nonlinear optical converters for a wide range of applications.
- A. M. Vyunishev, A. S. Aleksandrovsky, A. I. Zaitsev, and V. V. Slabko, Čerenkov nonlinear diffraction in random nonlinear photonic crystal of strontium tetraborate, Appl. Phys. Lett. 101, 211114 (2012).
- A. S. Aleksandrovsky, A. M. Vyunishev, A. I. Zaitsev, G. I. Pospelov, and V. V. Slabko, Diagnostics of fs pulses by noncollinear random quasi-phase-matched frequency doubling, Appl. Phys. Lett. 99, 211105 (2011).
- A. S. Aleksandrovsky, A. M. Vyunishev, A. I. Zaitsev, A. A. Ikonnikov, and G. I. Pospelov, Ultrashort pulses characterization by nonlinear diffraction from virtual beam, Appl. Phys. Lett. 98, 061104 (2011).