Two- and three-photon absorption in chemical vapor deposition diamond

Abstract

We report on the nonlinear optical properties (absorption and refraction) of monocrystalline chemical vapor deposition diamond studied by photoluminescence and Z-scan measurements. The studied spectral interval 2.8-6.2 eV can be divided into three regions in which the one-, two-and three-photon absorption (1PA, 2PA, 3PA) dominate. We obtained the values of 2PA and 3PA coefficients of diamond (α 2 0.9 cm∕GW at 4 eV and α 3 2.3×10 −4 cm 3 ∕GW 2 at 3.1 eV) and of the nonlinear refractive index (8×10 −7 cm 2 ∕GW at 2.9 eV) for several irradiation photon energies. We interpret the measured spectral dependence of nonlinear absorption coefficients in terms of direct and indirect multiphoton absorption.

Giant nonlinear optical effects induced by nitrogen-vacancy centers in diamond crystals

“…Hereafter, we will discuss the value of n 2 to examine the effect of the NV center in diamond. The n 2 in Table 2 obtained for the non-implanted and the lightly implanted diamond (2.0×10 11 N + /cm 2 ) are very small if we consider the standard deviations, but are in good agreement with those obtained by Z-scan measurements by other groups [13,29]. On the other hand, the quadratic dependence of the ∆R R signal observed in the present study is surprisingly coincide with the signal from photo-carriers generated upon green laser (532 nm) illumination as the function of the green laser power [30].…”

Optical study of carrier diffusion and recombination in CVD diamond

“…(A2) can be used for data processing. The initial carrier density calculated from known value of three-photon absorption coefficient a 3 ¼ 2.3 Â 10 À4 cm 3 GW À2 [11] and parameters of excitation pulses was N i ¼ 6 Â 10 16 cm À3 . The observed transient diffraction dynamics at room temperature are shown in Fig.…”

“…where t R is the recombination decay time and t D is the decay time of diffracted signal. By the three-photon excitation of diamond at 3.1 eV, the dependence of carrier density N % I 3 was observed in z-scan and time-integrated PL [11]. If we assume the linearity of induced absorption or refractive index change with the carrier density, the grating modulation in a short time Dt after excitation can be written as Daðx; DtÞ; Dnðx; DtÞ % Nðx; DtÞ;…”

“…We measured the transient diffraction at gratings created by two interfering 3.1 eV pulses. The three-photon absorption [11] of these pulses leads to a creation of the thick grating with modulation profile $(1 þ cos(2px/L)) 3 . The classical analysis of transient diffraction efficiency at thick gratings of cosine profile can be found for example in Ref.…”

Towards a Room-Temperature Spin Quantum Bus in Diamond via Electron Photoionization, Transport, and Capture

“…As can be seen, σ opt ðλÞ decays towards shorter wavelength, whereas σ ion ðλÞ grows. F NV ðλÞ therefore increases towards shorter wavelength until it is ultimately limited to ∼90% by the onset at λ ∼ 452 nm (photon energy ∼2.74 eV) [82] of two-photon indirect excitation of electrons to the conduction band from the diamond valence band. This interband excitation will generate many conduction electrons with unpolarized spins, which will swamp the spin-polarized electrons photoionized from NV − .…”