Investigation of the pyramid–prism boundary of a rapidly grown KDP crystal

Abstract

To investigate the pyramid–prism (PY–PR) boundary of a rapidly grown KDP crystal, the exact position of the PY–PR boundary of an X-cut rapidly grown KDP sample is determined by measuring the refractive-index non-uniformity.

Rapid growth of a long-seed KDP crystal

“…To evaluate the properties of the long-seed KDP crystal, the high-resolution X-ray diffraction (HRXRD) of an Xcut sample from this crystal was carried out [29] . The transmission spectrum of a THG-oriented sample cut from the long-seed KDP crystal was tested using a Lambda 1050 spectrometer [18] . The LID threshold (LIDT) at 355 nm of the THG-oriented sample was investigated under a Nd:YAG laser [30] .…”

“…The full width at half maximum (FWHM) of the HRXRD is 28.8 arc seconds, indicating that the long-seed KDP crystal has good crystalline quality. More details about the testing can be found in other articles [18,24] . As defined by the plane wave dynamic theory of X-ray diffraction, a smaller value of FWHM indicates better crystallinity [32,33] .…”

“…For the KDP-type crystals produced by the 'point-seed' rapid growth method, all prismatic faces and pyramidal faces develop under high supersaturated solutions [14][15][16][17] . In addition, a pyramid-prism (PY-PR) boundary is generated when different kinds of crystallographic faces are sewn together [18][19][20][21] . By the orthogonal polarization interferometry technology, ∆(n e -n o ) maps containing the PY-PR boundary were easily obtained, and the distortion near the PY-PR boundary was reported to be detrimental to efficient frequency tripling and phase Correspondence to: H. Qi and J. Shao, No.…”

Rapid Growth of a Cuboid DKDP (KDxH2–xPO4) Crystal

“…DKDP (KD x H 2‑x PO 4 ) is the best nonlinear crystal used as a tripler in inertial confinement fusion (ICF) facilities, because this crystal can minimize stimulated Raman scattering. , It takes 1–2 years to get a DKDP tripler for ICF facilities using a traditional growth method; therefore, the development of a rapid growth method is important. , In a “point-seed” rapidly grown DKDP crystal, all prismatic and pyramidal crystallographic faces grow. Where these two crystallographic faces are next to each other, a pyramid–prism (PY–PR) boundary appears. , Using orthogonal polarization interferometry, the abrupt Δ­( n e – n o ) distribution near the PY–PR boundary was clearly identified . The abrupt Δ­( n e – n o ) of the PY–PR boundary has a detrimental effect on the harmonic generation and phase matching. , The threshold of the laser-induced damage (LID) near the PY–PR boundary of a “point-seed” rapidly grown KDP crystal was also found to be less than half of other sectors .…”

“…5,6 Using orthogonal polarization interferometry, the abrupt Δ(n e − n o ) distribution near the PY−PR boundary was clearly identified. 7 The abrupt Δ(n e − n o ) of the PY−PR boundary has a detrimental effect on the harmonic generation and phase matching. 8,9 The threshold of the laser-induced damage (LID) near the PY−PR boundary of a "point-seed" rapidly grown KDP crystal was also found to be less than half of other sectors.…”