metrolux Optische Messtechnik GmbH

E-O crystals

BBO
KTP
LiTaO3
LiNbO3

BBO

BBO crystals with Z-cut is an excellent electro-optic crystal combining good physical properties, it's suitable for high power online_orderings. It launchs a super Q-switch for a cw diode pumped Nd:YAG laser with average power >50w.Please refer to Page 14 for more information about BBO crystal.

We can provide as large as 6x6x25mm BBO for high power online_ordering. The standard BBO for Q-Switch as:

Part No.	Size(mm)	Orientation	Coating

BBO101	3x3x18	Z-Cut	Z-face AR coating,X-face Au coating
BBO102	3x3x20	Z-Cut	Z-face AR coating,X-face Au coating

KTP

KTP has promising E-O and dielectric properties comparable to those of LiNbO ₃; , which makes it extremely useful to various E-O devices. The following table gives the comparison _of KTP and thos commonly used E-O modulator materials:
Material
Phase
Amplitude
e
n
r pm/V
k 10 -6 /°C
n 7 r 2 / e (pm/V) 2
r pm/V
k 10 -6 /°C
n 7 r 2 / e (pm/V) 2
KTP
15.4
1.80
35.0
31
6130
27.0
11.7
3650
LiNbO ₃;
27.9
2.20
31.0
82
7410
20.1
42
3500
KD*P
48.0
1.47
26.4
9
178
24.0
8
178
LiIO ₃
5.9
1.47
6.4
24
335
1.2
15
124

When these properties are combined with high damage threshold, low optical loss at high average power, wide optical bandwidth, thermal and mechanical stability, KTP crystals are expected to replace LiNbO ₃; crystals as E-O modulators, especially for mode-locking diode laser pumped Nd:YAG and Nd:YLF lasers as well as Ti:Sapphire and Cr:LiSrAlF 6 lasers.
LiTaO3
LiTaO3 crystal is also widely used E-O crystal, due to its optical, NLO and E-O poperties similar to those of LiNbO₃ crystal, but with higher damage threshold (> 500 MW/cm2 for ns pulsed). Main properties include:

Transparent Range: 0.4 - 5.0 μm; E-O Coefficient: r ₃₃ =30.4;
Refractive Indices: n _o =2.176, n e =2.180 @ 633 nm.
We can provide the LiTaO3 in a-cut boubles, wafers, slices.
Capabilities:
Boules:
1) Diameter: f40mm ~ f102mm
2) Length: 50mm ~ 150mm
3) Orientation: X, Z, 36°Y, 42°Y, 128°Y
4) Polish: 0.016 m m
Wafers :
1) Diameter: f40mm ~ f102mm
2) Length: 0.2~1.2mm
3) Orientation: X, Z, 36°Y, 42°Y, 128°Y
4) Flatness:
< 10mm for f 40 ~ 65mm
< 15mm for f 65 ~ 102mm
5) Bow:
< 20mm for f 40~ 65 mm,
< 40mm for f 65 ~102mm
Slices :
1)
Size: 100x45x1.5mm ~ 120x40x2mm
Parameter of LN and LT:
Part Name
LiNbo3
LiTaO3
Crystal Class:
Trigonal
Trigonal
Point Group:
3m
3m
Space Group:
R3c
R3c
Lattice Point:
a:0.5148
c:1.3863
a:0.5154
c:1.3784
Melting Point:
1250
1650
Density:
4.64
7.46
Curie Temp:
~1160
~607
Hardness:
5
5.5
Dielectric Coefficient:
e11/E0:85
e33/E0:29.5
e11/E0:51.7
e33/E0:44.5
Elastic Stiffness:
CE11:2.04
CE11:2.33
Coefficient:(x10 -11 C/m2)
CE11:2.46
CE11:2.77
Piezoelectric Stresses:
d22:2.04
d22:2.4
Coefficient (x10 -11 C/N)
d22:19.22
d22:0.8
LiNbO ₃
LiNbO ₃; is widely used as electro-optic modulator and Q-switch for Nd:YAG, Nd:YLF and Ti:Sapphire lasers as well as modulator for fiber optics, etc. The transverse modulation is mostly employed for LiNbO ₃; crystal.
If the light propagates in z-axis and electric field applies to x-axis, the refractive retardation will be
G = p Lnr22V/ l d. The electro-optic coefficients of LiNbO ₃; are:
r ₃₃ = 32 pm/V, r ₃₁ = 10 pm/V, r ₂₂ = 6.8 pm/V at low frequency
r ₃₃ = 31 pm/V, r ₃₁ = 8.6 pm/V, r ₂₂ = 3.4 pm/V at high electric frequency.
MgO:LiNbO ₃; and ZnO: LiNbO ₃; crystals have similar electro-optic properties to LiNbO ₃; but with higher damage threshold.
The refractive index of an _optical medium is altered by the presence of sound, this is called acousto-optic effect which can be used in many devices include optical modulators, switches, deflectors, filters, frequency shifters and spectrum analyzers. We provide several kinds of acousto-optic crystals: LiNbO₃; SAW wafers, LiTaO 3 SAW wafers. TeO2 and PbMnO4 crystals.

	News	About Us	Contact	Downloads	Newsletter