New nonlinear‐laser effects in GdVO₄ – host‐crystal for Ln³⁺ lasants

Abstract

We discovered several new nonlinear-laser χ-properties in tetragonal GdVO 4 vanadate, which is hostcrystal for lanthanide lasant ions, and attractive gain media for Raman laser converters. We hope that observed many-phonon SRS, almost two-octave Stokes and anti-Stokes lasing comb, cascaded self-frequency "tripling" and self-sum-frequency generation in the blue and UV spectral range could significantly enriche funcional laser potential of this crystal. Dedicated to Prof. Ladislav Bohatý on the occasion of his 60th birthday

Impulsive stimulated Raman scattering in tetragonal GdVO4single crystal: many-phonon Stokes and cross-cascaded lasing

“…Knowing energy gaps between SRS-active phonon modes in GdVO 4 crystal, which were recorded in the steady-state pumping condition (see, e.g. [1,12,18]), we chose the pumppulse duration to provide the desired spectral resolution for ISRS Stokes lasing components. One of the recorded ISRSlasing spectra of a tetragonal GdVO 4 single crystal is shown in figure 2(b).…”

“…One of the recorded ISRSlasing spectra of a tetragonal GdVO 4 single crystal is shown in figure 2(b). In this measurement to determine more clearly the spectral position of the four recorded Stokes components (ω SRS1 ≈ 882 cm −1 , ω SRS2 ≈ 807 cm −1 , ω SRS3 ≈ 823 cm −1 and ω SRS7 ≈ 378 cm −1 ), we used τ p ≈ 600 fs pump-pulses and at the same time to maintain the required conditions for impulsive χ (3) -nonlinear lasing τ p < T 2 = (πΔν R ) −1 = (1.2-3.5) ps [12,18] (here T 2 and Δν R are the dephasing time and linewidth of the Raman shifted lines in spontaneous Raman scattering spectra related to SRS-promoting vibration modes, respectively). It is important to note the direct cascaded four-phonon ISRS lasing ).…”

Optical and spectroscopic properties of Ytterbium-doped YAG

“…Rare earth doped materials are used in a wide variety of optical applications including and high power solid state and fiber lasers [1][2][3][4][5]. For one micron lasers, Yb-doped materials are being used with increasing frequency for high-power laser applications because of their sharp absorption at 976 nm and small quantum defect.…”

Precise measurement of the thermo-optical coefficients of various Nd-doped vanadates with an intracavity self-mode-locked scheme

“…The thermal-optic coefficient dn/dT of a laser crystal is explicitly associated with the thermally induced lensing effect that significantly influences the cavity stability, the oscillation mode size, the maximum achievable average power and the quality of the output beam [6,7]. There are some reported values of dn/dT obtained by different methods for Nd:GdVO 4 , Nd:YVO 4 and Nd:LuVO 4 crystals near 1064 nm [8][9][10][11][12][13][14]. However, the reported data are found to differ considerably from each other.…”