NLO Crystal

Physical and Optical Properties

NLO theroy

Crystal Structure

trigonal, space group R3c

Orthorhombic, point group mm 2

Orthorhombic, point group mm 2

Trigonal, space group R 3c

Transparency Range

189 - 3500 nm

350nm~4500nm

160 - 2600 nm

420 - 5200 nm

Cell Parameters

a=b=12.532Å, c=12.717Å

a=6.404Å, b=10.616Å, c=12.814Å

a=8.44731Å, b=7.3788Å, c=5.1395Å

a = 0.515Å, c = 13.863Å

Melting Point

1095 +/-5°C

1172°C incongruent

834°C

1255 +/-5°C

Curie point

925 +/-5°C

936°C

1140 +/-5°C

Optical Homogeneity

Δn ≈ 10^-6 /cm

Δn ≈ 10^-6 /cm

Δn ≈ 10^-6 /cm

Δn ≈ 5 x 10 ^-5/cm

Mohs Hardness

4.5

5

6

5

Density

3.85 g/cm³

3.01 g/cm³

2.47g/cm³

4.64 g/cm³

Thermal Conductivity

|_ c, 1.2 W/m/K; ||c, 1.6 W/m/K

0.13 W/cm/°K

38 W /m /K @ 25°C

Phase-matchable SHG range

205nm-1750nm

1000-2000nm

800-2000nm

Absorption Coefficient

< 0.1%/cm (at 1064 nm)

a < 1%/cm @1.064 µm and 0.532 µm

<=1%/cm at 1064nm

<0.1%/cm @ 1064 nm

NLO coefficients

d₁₁ = 5.8 x d36(KDP) 
            d₁₁ = 0.05 x d 11 , 
            d₂₂ < 0.05 x d₁₁

d₃₁ =2.54pm/V, 
            d₃₁ =4.35pm/V, 
            d₃₁ =16.9pm/V 
            d₂₄ =3.64pm/V, 
            d₁₅ =1.91pm/V at 1.064 mm

d₃₃ = 34.4pm/V 
            d₃₁ = d15 = 5.95pm/V 
            d₂₂ = 3.07pm/V

Damage Threshold at 1.064 mm

12.9J/cm²9.9GW/cm²

6.0J/cm²; 4.6GW/cm²

24.6J/cm²; 18.9GW/cm²

200 MW/cm²

Refractive Indices 
            at 1.0642 mm 
            at 0.5321 mm

n_e = 1.5425, n_o= 1.6551 
            n_e = 1.5555, n_o= 1.6749

N_x = 1.73991
            N_y = 1.74802
            N_z = 1.82956
            N_x = 1.77903
            N_y = 1.79002
            N_z = 1.88628

N_x = 1.56447
            N_y = 1.59050
            N_z = 1.60538
            N_x = 1.57842
            N_y = 1.60650
            N_z = 1.62154

N_o = 2.23216
            N_e = 2.15600 
            N_o = 2.32309 
            N_e = 2.23415

Typical Specification and Capabilities

Angle tolerance

Δθ< ± 0.5°; Δφ< ±0.5°

Δθ< ± 0.5°; Δφ< ±0.5°

Δθ< ± 0.5°; Δφ< ±0.5°

Δθ< ± 0.5°; Δφ< ±0.5°

Dimension tolerance

(W ± 0.1mm) x (H ± 0.1mm) x (L + 0.2mm/-0.1mm)

(W ± 0.1mm) x (H ± 0.1mm) x (L + 0.2mm/-0.1mm)

(W ± 0.2mm) x (H ± 0.2mm) x (L + 0.2mm/-0.2mm)

(W ± 0.1mm) x (H ± 0.1mm) x (L + 0.2mm/-0.1mm)

Flatness

< λ /8 @ 633nm

λ/8 @ 633nm

λ /4 @ 632.8nm

< λ/8 @ 633nm

Scratch/Dig code

better than 10/5 Scracth/dig per MIL-O-13830A

better than 10/5 Scracth/dig per MIL-O-13830A

Better than 20/10 Scracth/dig

better than 10/5 Scracth/dig per MIL-O-13830A

Parallelism

< 20 arc seconds

< 20 arc seconds

< 20 arc seconds

< 20 arc seconds

Perpendicularity

< 5 arc minutes

< 5 arc minutes

< 30 arc minutes

< 5 arc minutes

Wavefront distortion

< λ/8 @ 633nm

< λ/8 @ 633nm

< λ/4 @ 632nm

< λ/8 @ 633nm

Clear aperture

> 90% central area

> 90% central area

Central 80%

> 90% central area

Aperture

1x1 ~ 12x12mm

1x1 ~ 10x10mm

2 ~ 10mm

1~50 mm

Length

0.02 ~ 25mm

0.05 ~ 20mm

0.3~20 mm

0.3~20 mm

Phase matching type

Type I or Type II

Type II

Type I or Type II

Type I or Type II

End configuration

Flat or Brewster or Specified

Flat or Brewster or Specified

Flat, spherical, parallel and wedged

Flat, spherical, parallel and wedged

Typical Coating

Antireflective coating

Antireflective coating Highreflective Coating

Antireflective Coating

Antireflective Coating