LBO crsytal (Lithium Tri-borate) is one of the most useful nonlinear optical material not just for its relatively large conversion coefficient – 3x that of KDP, but also for its excellent physical propertie
Lithium Tri-borate (LBO Crystal) is one of the most useful nonlinear optical material not just for its relatively large conversion coefficient – 3x that of KDP, but also for its excellent physical properties.
LBO crystal has broad optical transparency range from 160 to 2600 nm. It excels in high power SHG with minimal thermal lens as compared to KTP. Its large acceptance angle paired with small walk-off angle which reduces the beam quality requirement for source
LBO Crystal also allows temperature controllable type I non-critical phase-matching(NCPM) for 1000 – 1300 nm and type II NCPM for 800 to 1100 nm at room temperature. With a high optical homogeneity (?n ~10-6), the material is grown virtually inclusion free. With a damage threshold of up to 45 GW/cm2 at 1064 nm, it is again the material of choice for high-power applications.
LBO Crystals are widely used for SHG and THG of Nd:YAG, Nd:YLF, Nd:YVO4 and ultra-fast Ti:sapphire lasers. OPOS (Optical Parametric Oscillators) and OPAS (Optical Parametric Amplifier).
LBO Crystal Physical Property
Chemical Formula | LiB3O5 |
Crystal Structure | Orthorhombic, mm2 |
Cell Parameters | a = 8.4473, b = 7.3788Å, c = 5.1395Å, Z = 2 |
Melting point | 834°C |
Optical homogeneity | d n ~ 10-6/cm |
Mos hardness | 6 |
Density | 2.47 g/cm3 |
Absorption coefficient | < 0.1%/cm (at 1064 nm and 532 nm) |
Specific heat | 1.91J/cm3xK |
Hygroscopic susceptibility | low |
Thermal expansion coefficients | a, 4 x 10-6/K; c, 36 x 10-6/K |
Thermal conductivity | ^ c, 1.2 W/m/K; //c, 1.6 W/m/K |
Linear Optical Properties
Transparency range | 1 60-2600 nm |
Refractive indices: at 1064 nm at 532 nm at 355 nm | nx = 1.5656, ny = 1.5905, nz = 1.6055 ne = 1.5785, no = 1.6065, nz = 1.6212 ne = 1.5971, no = 1.6275, nz = 1.6430 |
Therm-optic coefficients | dno / dT = -9.3 x 10-6/°C dne / dT = -16.6 x 10-6/°C |
Sell Meier Equations (l in mm) | |
no2 (l) = 2.7359 – 0.01354l2+ 0.01878/(l2-0.01822) |
Nonlinear Optical Properties
Phase-matchable output wavelength | 554 – 2660 nm (type I), 790 – 2150 nm (type II) |
NLO coefficients | d33 = 0.06; d32 = 1.2; d22 = 1.1 |
Walk-off Angles(@ 1064 nm) | 0.4° (Type I SHG), 0.3° (Type II SHG) |
Acceptance Angles(@1064 nm) for SHG Type I | 9.6(mrad-cm) CPM at 25°C 248(mrad-cm) NCPM at 150°C |
Electro-optic coefficients | g 11 = 2.7 pm/V, g 22, g31 < 0.1g11 |
Conversion Efficiency | >90% (1064 -> 532nm) Type I SHG |
Damage threshold at 1064 nm at 532 nm at 355 nm | 45 GW/cm2 (1 ns); 10 GW/cm2 (1.3 ns) 26 GW/cm2 (1 ns); 7 GW/cm2 (250 ps) 22 GW/cm2 |
Lithium Tri-borate Crystal Specifications
Thin crystals: (5-10) x (5-10) x (0.01-3) mm3 |
Regular sizes: 2 x 2 mm2 to 30 x 30 mm2 in cross-section, up to 60 mm in length |
Absorption: < 20ppm (0.00002%) @1064 |
S/D of 0/0 for cross-section: up to 5 x 5 mm |
Different cuts, sizes and AR coatings are available upon request. |
Nonlinear LBO crystals, LBO crystal have wide transparency region, Broad type 1 and type 2 NCPM, small walk-off angle and high damage threshold.
LBO Crystal is a non-linear optics crystal, owns LBO crystal’s production capability in our modern workshops.
LBO crystal (Lithium Triborate – LiB3O5) has become the material of choice for high power laser applications from the UV to NIR.
Nonlinear LBO crystals, LBO crystal have wide transparency region, Broad type 1 and type 2 NCPM, small walk-off angle and high damage threshold.
It is unique in many aspects, especially its wide transparency range, moderately high non-linear coupling, high damage threshold and good chemical and mechanical properties. Its transmission range is from 0.16m to 2.6m.
LBO crystals allows temperature-controllable non-critical phase-matching (NCPM) for 1.0-1.3 m, Type I SHG, and also provides room temperature NCPM for Type II SHG at 0.8-1.1 m. It possesses a relatively large angular acceptance bandwidth, reducing the beam quality requirements for source lasers.
Nonlinear LBO crystals, LBO crystal have wide transparency region, Broad type 1 and type 2 NCPM, small walk-off angle and high damage threshold.
Tag:LBO, nonlinear, high damage threshold, frequency doubling, high power lasers, crystal LBO, Crystals,nonlinear and laser crystals, crystal, lbo, second harmonic generation, lithium triborate.
LBO Features
Wide transmission region from 160 nm to 2600nm
Large effective second-harmonic-generation (SHG) coefficient (about three times that of KDP)
Good mechanical and physical properties
High damage threshold of 18.9 GW/cm2 for a 1.3 ns laser at 1053 nmv
Both Type I and II NCPM in a wide wavelength range is possible
Wide acceptance angle and small walk-off
High optical homogeneity with δn≈10-6/cm
Spectral NCPM near 1300 nm
LBO Crystal Applications
Frequency doubling and tripling of Nd:YAG and Nd:YLF lasers.
SHG and THG for middle and high power Nd: lasers at 1064 nm for medical, industrial and military applications
SHG and THG of high power Nd: lasers at 1342 nm & 1319 nm for red and blue laser
Optical parametric amplifiers (OPA) and oscillators (OPO) pumped by Excimer lasers and harmonics of Nd:YAG lasers.
Optical parametric chirped pulse amplification (OPCPA) in ultrafast pulse system