OST Photonics YVO4 Laser Crystals

Flatness

λ/10 @ 632.8nm

Wavefront distortion

λ/4@ 632.8nm

Surface Quality

10/5 per MIL-O-13830B

Parallelism

10″

Perpendicularity

10′

Bevel/Chamfer

<0.1mm@45deg.

Chips

<0.1mm

Clear Aperture

>95%

Coating

AR/HR (IAD, EB, IBS) coating upon customer’s request

Damage Threshold

750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz

Quality Warranty Period

One year under proper use

Thermal Expansion (/℃)

c-axis

11.4x10^-6

9.2x10^-6

26.3x10^-6

16.7x10^-6

a-axis

4.4x10^-6

7.1x10^-6

5.4x10^-6

7x10^-6

Refractive Index

no

1.9447@1550nm

2.454@1530nm

1.6346@1497nm

2.2151@1440nm

ne

2.1486@1550nm

2.710@1530nm

1.4774@1497nm

2.1413@1440nm

Birefringence(ne-no)

0.2039@1550nm

0.256@1530nm

-0.1572@1497nm

-0.0738@1440nm

Mohs Hardness

5

6.5

3

5

Deliquescence

None

None

Weak

None

Transparency range

0.4-5μm

0.4-5μm

0.35-2.3μm

0.4-5μm

Crystal Symmetry

Zircon Tetragonal, space group D4h

Crystal Cell

a=b=7.12Å，c=6.29Å

Density

4.22g/cm3

Mohs Hardness

5

Hygroscopic Susceptibility

Non-hygroscopic

Thermal Expansion Coefficient

αa = 4.43×10^-6/K；αc = 11.37×10^-6/K

Thermal Conductivity Coefficient

//C: 5.23 W/m/K； ⊥C: 5.10 W/m/K

Thermal Optical Coefficient

dna/dT = 8.5×10^-6/K；dnc/dT = 3.0×10^-6/K

Crystal Class

Positive uniaxial with no=na=nb, ne=nc

Refractive Indices, Birefringence
(Δn = ne- no)
and Walk-off Angle @ 45° (ρ)

no = 1.9929, ne = 2.2154, Δn = 0.2225, ρ= 6.04° at 630nm
no = 1.9500, ne = 2.1554, Δn = 0.2054, ρ= 5.72° at 1300nm
no = 1.9447, ne = 2.1486, Δn = 0.2039, ρ= 5.69° at 1550nm

Sellmeier Equation（λ in μm）

no²= 3.77834 + 0.069736/(λ² - 0.04724) - 0.0108133λ²
ne²= 4.59905 + 0.110534/(λ²- 0.04813) - 0.0122676λ²