Consequently, this work concentrates on the further investigation for the physical properties of the KLHCY crystal and paths an expansive avenue for the growth and prosperous applications of the KLHCY crystal in promising realms. This crystal has outstanding NLO properties as a frequency converter into the. Furthermore, the NLO coefficients of KLHCY are perfected through the Maker fringe method, determined as | d 31| = 1.97 pm V –1, | d 32| = 0.20 pm V –1, and | d 33| = 2.47 pm V –1, showing leading values over the known fourth harmonic generation (FHG) NLO crystals. 193 nm) Using 99 6 mm3 CBO crystal ( 1440.8, w1490 ) as the final. Hence, the 266 nm light generation can be acquired by type Ι PM conditions, in which PM angles are elaborately derived to ( φ = 50°, θ = 90°) and ( φ = 0°, θ = 38.5°). Among these crystals, BBO is widely used in different ultrafast NLO applications and others are not so popular, till yet. Based on the progressive works, phase-matching (PM) wavelength ranges for KLHCY are revised, where the type Ι and type ΙΙ PM fundamental wavelengths cover 482–5178 and 524–3174 nm, respectively. Nonlinear optical (NLO) crystals serves the goal for generating coherent laser in the ultraviolet (UV) and deep-ultraviolet (DUV) frequency range through. of BBO, CLBO, KABO, LB4, and KBBF crystals are 188-3500, 175-2750, 180-3600, 160-3500, and 155-3780 nm, re-spectively 5-9. Meanwhile, refractive index measurements are carried out by the auto-collimation method and fitted well according to Sellmeier equations, deriving moderate birefringence within 266–1064 nm. Its thermophysical properties are explored thoroughly, evidencing the possibility of potential laser applications. A hydro-isocyanurate nonlinear optical (NLO) crystal, KLi(HC 3N 3O 3)♲H 2O (KLHCY), with dimensions of 60 × 55 × 30 mm 3, has been successfully developed by means of a water solution method, whose quality is evidenced through the rocking curve measurement.
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