Products>E-O Crystals

Best Crystals in OptoCity

Electro-Optic Crystals

1. BBO (b-Ba2BO4)

BBO crystals with Z-cut is an excellent electro-optic crystal features with high damage threshold, Low hygroscopic. It launchs a super Q-switch for a cw diode pumped Nd:YAG laser with average power >50w.

OptoCity provides as large as 6x6x25mm BBO for high power E-O applications. The standard BBO for Q-Switch are listed as following:

Part No.	Size(mm)	Orientation	Coating	Unit Price
				<5pcs	>20pcs
BBO101	3x3x18	Z-Cut	Z-face AR coating, X-face Cr/Au coating	$499	$408
BBO102	3x3x20	Z-Cut	Z-face AR coating, X-face Cr/Au coating	$559	$448

2. KTP---KTiOPO4

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 those commonly used E-O modulator materials:

Material			Phase			Amplitude
	e	n	r (pm/V)	k(10E-6/deg. C)	n 7 r 2 / e (pm/V) 2	r (pm/V)	k (10E-6deg. 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

Combining these properties 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:LiSrAlF6 lasers.

OptoCity provides as large as 7x7x25mm KTP crystal for E-O application at a resonable price. Please Contact Us for more information.

3. LiTaO3

LiTaO3 crystal is also a widely used E-O crystal. Its optical, NLO and E-O poperties are 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 mm;

E-O Coefficient: r 33 =30.4;

Refractive Indices: n o =2.176, n e =2.180 @ 633 nm.

 

OptoCity provides LiTaO3 in boubles, wafers or slices.

Capabilities:

 

4. LiNbO3

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 LiNbO3 crystal. If the light propagates in z-axis and electric field applies to x-axis, the refractive retardation will be:

G = pLnr22V/ 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 as LiNbO3 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. OptoCity provides several kinds of acousto-optic crystals: LiNbO3 SAW wafers, LiTaO 3 SAW wafers, TeO2 and PbMnO4 crystals.

See Physical and Optical Properties of E-O Crystals