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LBO

Lithium triborate (LiB3O5 or LBO) has the exceptional nonlinear properties that make it a very important nonlinear application.

LBO crystals advanced
◆  Broad transparency range from 160nm to 2600nm
◆  High optical homogeneity and quality
◆  Large effective SHG coefficient
◆  High damage threshold (18.9 GW/cm2 for 1.3ns laser at 1064nm)

◆  Wide acceptance angle and small walk-off

◆  Non-critical phase matching (NCPM) in a wide wavelength range


CLASER LBO’s advantage:
◆  Absorption: <100ppm/cm @1064nm <50ppm/cm

◆  IBS High damage coating for high power laser
◆  Good laser beam quality
◆  Low cost for industrial customer 

Linear Optical Properties:

ransparency range: 155-3200 nm
Sellmeier equations:  
( l in um)		 nx2=2.454140+0.011249/(λ2-0.011350)-0.014591λ2-6.60x10-5λ4
ny2=2.539070+0.012711/(λ2-0.012523)-0.018540λ2+2.0x10-4λ4
nz2=2.586179+0.013099/(λ2-0.011893)-0.017968λ2-2.26x10-4λ4
Refractive index:
at 1064 nm 
at 532 nm 
at 266 nm		  
n x = 1.5656, n y = 1.5905, n z =1.6055 
n x = 1.5785, n y = 1.6065, n z =1.6212 
n x = 1.5973, n y = 1.6286, n z =1.6444
Therm-optic coefficients:
(/K, l in m m)		 Dn x /dT = -1.8x 10 -6 
dn y /dT = -13.6 x 10 -6 
Dn z /dT = (-6.3-2.1 l ) x 10 -6
  
Nonlinear Optical Properties:
 
NLO coefficients:		 d 31 =1.05 ± 0.09 pm/V 
d 32 = -0.98 ± 0.09 pm/V 
d 33 =0.05 ± 0.006 pm/V
Effective nonlinearity expressions d ooe =d 32 cos f (in XY plane)
d eeo =d 31 cos 2 q +d 32 sin 2 q (in XZ plane)
d oeo =d 31 cos q (in YZ plane)
d eoe =d 31 cos 2 q +d 32 sin 2 q (in XZ plane)
Damage threshold: 
at 1064nm 
at 532nm
9GW/cm 2 (9 ns); 19 GW/cm 2 (1.3 ns) 
2.2 GW/cm 2 (10 ns); 45 GW/cm 2 (100 ps)
 
Applications
  1. SHG and THG for middle and high power Nd: lasers at 1064nm for medical, industrial and military applications;
  2. SHG for Ti:Sapphire, Alexandrite and Cr:LiSAF lasers;
  3. SHG and THG of high power Nd: lasers at 1342nm & 1319nm for red and blue laser
  4. SHG for the Nd: Lasers at 914nm & 946nm for blue laser.
  5. The VUV output at 187.7 nm is obtained by sum-frequency generation.
  6. NCPM SHG over a broad wavelength range from 900nm-1700nm was measured.
  7. Phase matching process cutoff: SHG-554 nm fundamental, THG-794 nm, SFM-down to 160 nm.
  8. Optical Parametric Amplifiers (OPA) and Oscillators (OPO) application;
 
SHG and THG at Room Temperature
LBO is phase matchable for the SHG and THG of Nd:YAG and Nd:YLF lasers, using either type I or type II interaction. For the SHG at room temperature, type I phase matching can be reached and has the maximum effective SHG coefficient in the principal XY and XZ planes in a wide wavelength range from 551nm to about 3000nm. LBO is the first choice for making doubler or tripler for lasers such as Nd:YAG where high power density, high stability, and long time operation are required.
SHG tuning curves of LBO NCPM temperature tuning curves of LBO
Non-Critical Phase-Matching
Non-Critical Phase-Matching (NCPM) of LBO is featured by no walk-off, very wide acceptance angle and maximum effective coefficient. It promotes LBO to work in its optimal condition. As shown, type I and type II non-critical phase-matching can be reached along x-axis (θ=90 °, φ=0 °) and z-axis (θ=0 °, φ=0 °) at room temperature, respectively.
SHG conversion efficiencies of more than 70% for pulse and 30% for cw Nd:YAG lasers, and THG conversion efficiency over 60% for pulse Nd:YAG laser have been observed. Properties of type I NCPM SHG at 1064nm
NCPM Temperature 148 ° C
Acceptance Angle 52 mrad-cm 1/2
Walk-off Angle 0
Temperature Bandwidth 4 ° C-cm
Effective SHG Coefficient 2.69 d 36 (KDP)
LBO's OPO and OPA
LBO is an excellent NLO crystal for OPOs and OPAs with a widely tunable wavelength range and high powers. The unique properties of type I and type II phase matching as well as the NCPM leave a big room in the research and applications of LBO's OPO and OPA.
 
 

Specifications

Dimension tolerance (W ± 0.1 mm) x (H ± 0.1 mm) x (L + /-0.2 mm)
Transmitting wavefront distortion: l/8 @ 633 nm
Clear aperture: > 90% central area
Flatness: l/8 @ 633 nm
Scratch/Dig code: 10/5 to MIL-O-13830A
Parallelism: better than 20 arc seconds
Perpendicularity: 15 arc minutes
AR coating: R< 0.1% at 1064nm and R<0.4% at 532 nm.
Coating: High Damage Threshold Up to 10GW/cm2 at 1064nm, 6ns