A study of residual stress and the stress-optic effect in mixed crystals of K(DH)PO
Journal of Applied Physics, ISSN: 0021-8979, Vol: 73, Issue: 11, Page: 7780-7789
1993
- 26Citations
- 4Captures
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Article Description
In electro-optic applications of the mixed crystal K(DH )PO (KDP-KD*P), strain-induced refractive index variations result in beam depolarization and transmitted wave-front distortion. Here the combined linear stress-optic and electro-optic effects in crystals of KDP-KD*P oriented perpendicular to the c axis are analyzed and it is shown that while the depolarization is caused by the induced birefringence, the wave-front distortion is due to average index shifts. Furthermore, the birefringence is determined by the shear stress in the xy plane of the crystal while the average index shift depends only on the normal stresses. For depolarization losses of 0.1%-1% and wave-front distortion of 0.1-1λ, the critical range of stress is 10-10 Pa. Measured depolarization loss and wave-front distortion profiles of 5, 16, and 27 cm K(DH)PO crystals for 0≤x≤0.98 are also presented. Using the analysis described above it is shows that the maximum internal stresses in these crystals are within the critical range, but that the area-averaged stresses are substantially lower. It is found that crystals from different locations along the length of a boule can have similar strain birefringence and wave-front distortion profiles indicating that the growth conditions which generate the internal strain persist throughout a significant portion of the growth history of the boule. It is also observed that the most highly strained crystals come from near the seed cap. Finally, potential sources of strain in KD*P are discussed and thermodynamic and structural arguments are given which suggest that inhomogeneities in the H/D ratio are a potential source of the strain in KD*P.
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