KBBF

The KBBF crystal, short for Potassium Yttrium Double Tungstate, is a new type of deep ultraviolet nonlinear optical crystal

Classification:

Nonlinear Crystals

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Detailed introduction

The KBBF crystal, short for Potassium Yttrium Double Tungstate, is a new type of deep ultraviolet nonlinear optical crystal capable of producing high-quality, high-power laser ranging from infrared to vacuum ultraviolet. It has a high nonlinear optical coefficient and can generate coherent light in the deep ultraviolet region by direct second harmonic generation with a minimum wavelength of 177 nanometers. Alternatively, a special prism-coupling technique can be used to generate coherent laser light below 235 nanometers. KBBF crystal devices using this technique have a maximum aperture of 6×6 millimeters and a crystal thickness of approximately 1.5 millimeters. The KBBF crystal also boasts excellent optical uniformity and mechanical strength, as well as a high damage threshold, making it suitable for use in ultrafast laser systems.

　　Product features

　　High nonlinear optical coefficient and a wider transparent range,suit for a wider range of frequencies

　　Good optical uniformity and mechanical strength

　　Excellent thermal performance

　　High damage threshold

Crystal Chemistry and Structural Characteristics
Crystal structure	Tetragonal system
Lattice parameters	a=b=c=6.207Å
Melting point	834℃
Mohs hardness	4
Density	3.01g/cm³
Thermal conductivity	1.38W/(m·K)
Thermal expansion coefficient	a:7.5×10-6/K, b:7.5×10-6/K, c:5.5×10-6/K

Characteristic Parameters
Transmittance	＞70%(1064nm)
Optical uniformity	＜0.1%
Temperature stability	＜10^-5/K
Nonlinear optical coefficient	d31=1.3, d32=2.0, d33=3.3(pm/V)
Thermal coefficient	dn/dT=10^-5/K
Refractive index	no=1.6544, ne=1.6726(1064nm)
Nonlinear Coefficien(pm/v)	6.7(SHG), 2.2(THG)
Effective SHG coefficient (SHG, THG)	13.7(SHG), 1.3(THG)
Walk-off Angle (mrad·cm)	19.5(type I), 31.8(type II)
Acceptance Angle (mrad·cm)	12.7(type I), 20.8(type II)
Phase Matching Range (℃m)	643~780(SHG), 1200~1600(THG)
Temperature Acceptance (℃)	160
Damage Threshold(GW/cm²)	~2 (SHG), ~0.5 (THG)