PATENT CLAIM ANALYSIS

Application Number: 15744077
Application Type: Utility
Filing Date: 2018-01
Publication Date: 2018-07
Patent Classification: ["252", "584000"]

Abstract:
An oxychloride infrared nonlinear optical crystal and the preparation method and use thereof, the optical crystal has a general chemical formula of Pb 2+x OCl 2+2x , therein 0<x<0.139 or 0.141<x<0.159 or 0.161<x≤0.6. The crystal is non-centrosymmetric, belongs to orthonormal system with space group of Fmm2, cell parameter is a=35.4963(14)±0.05 Å, b=5.8320(2)±0.05 Å, c=16.0912(6)±0.05 Å. The crystal is prepared by high temperature melt method or flux method. The crystal has a strong second harmonic generation efficiency of 4 times that of KDP (KH 2 PO 4 ) tested by Kurtz method, it is phase machable, transparent in the range of 0.34-7 μm. The laser damage threshold is 10 times that of the current commercial infrared nonlinear optical crystal AgGaS 2 . No crystalline water exists in lead oxychloride, and it is stable in the air and has good thermal stability.

Claim (Index 2):
A method for preparing a lead oxychloride infrared nonlinear optical crystal, comprising:\n synthesizing a compound by using a solid state reaction method first, and then growing a crystal by high temperature melt method or flux method, and the specific operation is carried out according to the following steps: a. mixing and grinding PbCl 2  and PbO, Pb(CO 3 ) 2  or Pb(NO 3 ) 2  in a mortar, then transferring the grinded mixture into an Al 2 O 3  crucible with a size of \u03a6400 mm\u00d7400 mm, pressing the mixture in crucible, and putting into a muffle furnace, slowly heating to 300\u00b0 C. and keeping at this temperature for 24 hours, cooling at a room temperature to form the mixture loose, and then grinding the mixture uniformly, then putting the mixture into a muffle furnace at 430\u00b0 C. and kept for 48 hours, then grinding to obtain a lead oxychloride compound, which is identified by X-ray diffraction; b. melting the lead oxychloride compound obtained in step a in the crucible, heating to 450-650\u00b0 C., and keeping for 5-80 hours to obtain a mixed melt of lead oxychloride; or introducing fluxes of PbCl 2  or PbO is into the lead oxychloride compound obtained in step a to form a resulted mixture, and heating the resulted mixture to 450-650\u00b0 C., and keeping the resulted mixture for 5-80 hours to obtain a solution of lead chlorate and fluxes, wherein a molar ratio of lead chlorate and fluxes is 1:0.1-2; c. preparing a lead oxychloride seed crystal: a part of the mixed melting melt or solution obtained in step b is slowly cooled to the room temperature at a rate of 0.5-10\u00b0 C./h to obtain a lead oxychloride seed crystal by spontaneous crystallization; d. placing a crucible containing the mixed melt or solution as obtained in step b into a crystal growth furnace, and attaching the seed crystal obtained in step c on a crystal rod, and introducing a seed crystal into the crystal growing furnace from the top, and preheating for 5-60 minutes, introducing to contact the solution surface of the mixed melting solution or into the mixed melt for remelting, and keeping at the temperature for 5-60 minutes, and cooling to 350-510\u00b0 C. at a speed of 1-60\u00b0 C./h. e. cooling the mixture at a speed of 0.1-5\u00b0 C./day while the crystal rod is being rotating at a rate of 0\u02dc60 rpm for growing crystal, and the crystal is drawn out from the surface of the mixed melting solution when a predetermined size single crystal is obtained, and cooling to the room temperature at a rate of 1\u02dc80\u00b0 C./h, and taking from the furnace to obtain a lead oxychloride infrared nonlinear optical crystal.

Metadata:
- Claim Count in Document: 7.0
- Percentile: 86.0
- Lexical Diversity: 1.74257
- Patent Class: 252.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['13383797', '12420526', '13383743', '14426094', '16061670']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7885390687340252
- 35 USC 102 Novelty (BERT): 0.5076903192678185
- Combined Prediction Score: 0.7604541937874045
- Mean Citation Score: 259.139828
- Max Citation Score: 276.54428
- Similarity Product: 198.84860138454675

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test