Polarization dependence of two‐photon absorption coefficient and nonlinear susceptibility tensor in InP

Abstract

Two‐photon absorption (TPA) effect in (001) InP is investigated using fs laser. Its dependences on wavelength and polarization are clarified by single and double beam methods with linearly polarized lights. Characteristic features are revealed and discussed with scaling law, crystal bonding and mutual relation of polarizations for double beams. The results are successfully analyzed on the basis of the third‐order susceptibility tensor for comprehensive understanding of TPA effect at any polarization geometry. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Measurement of polarization dependence of two-photon absorption coefficient in InP using extended Z-scan technique for thick materials

“…( 7), and the β of InP was evaluated to be 23.03 ± 0.06 cm=GW, where the error indicates the fitting error. This β is larger than that of our previous work 4) by 31%. This is possibly due to the presence of some uncertain parameters in the previous work.…”

“…3) In our previous work, three independent tensor elements of Im[ χ (3) ] in InP have been estimated experimentally from the polarization dependence of β with a linearly polarized two-beam configuration. 4) However, there remains some uncertainty in β. This is because the obtained β was affected by somewhat uncertain parameters associated with the experimental condition, such as the waist size of the tightly focused beam, the sample length, and the transmittance of the air=InP interface, which were measured by other experiments using different setups.…”

“…The absorption predominantly occurs near the beam waist. The effective cross section of the absorbed beam represented by S eff at the beam waist is proportional to w 2 0 , that is, proportional to z R0 , and the interaction length L eff (≪ L) 4) is proportional to z R0 . Then, the absorption strength, which is proportional to (P in =S eff )L eff , is independent of z R0 and L. This implies that the saturated min{T} is insensitive to the nonlinear refractive index effect, which is considered as if w 0 or z R0 changes.…”

Measurement of third-order nonlinear susceptibility tensor in InP using extended Z-scan technique with elliptical polarization

“…We have investigated the TPA in indium-related compounds. [7][8][9] The β in InP, which has been widely used for optical devices, has been investigated for some wavelengths. [10][11][12][13] However, Im[ χ (3) ] has not been evaluated.…”

Nanostructured diode for infrared photodetection through nondegenerate two-photon absorption

“…However, using the validated TPA coefficient theory 11 [see Eq. ( 4)] and the latest of TPA for InP, 12,13…”