ELECTRO-OPTICAL PRODUCTS CORPORATION
	88-65 76th Avenue • Glendale, NY 11385, USA • Tel: 718-997-8100 • Fax: 718-997-8102 • www.eopc.com

Electro-Optic Modulators

		EO-10  EO-20  EO-300  EO-10-REM

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A complete family of E-O modulators, used for modulating laser beams, for intensity or frequency or phase modulation, consists of non-linear optics (crystals) utilizing the transverse Pockels effect (low voltage). The crystals span the entire laser spectrum using ADP, AD*P, KDP, KD*P, ADA, AD*A, RDA, CD*A, BBO, LBO, KTP, KnbO₃, LiTaO₃. Special AR coating in UV, visible or IR region are available upon request.

Precisely oriented, the crystals are mounted in thick-walled aluminum cylinders to minimize thermal gradients. Low absorption index matching fluid, combined with a fluid path length of less than 2mm, ensures high optical power transmission capability with no mode distortion or blooming.

For CUSTOM MODULATORS please contact us with your specifications.

SPECIFICATIONS:

	EO-10	EO-11	EO-12	EO-13	EO-14	EO-15
Half wave voltage @ 488 nm	54V	82V	36V	72V	72V	144V
Half wave voltage @ 514 nm	57V	87V	38V	76V	76V	152V
Half wave voltage @ 633 nm	70V	107V	47V	94V	94V	188V
Half wave voltage @ 1064 nm	117V	180V	79V	158V	158V	316V
Half wave voltage @ 2000 nm	220V	330V	148V	296V	296V	592V
Aperture	1mm	1mm	2.2mm	4.5mm	2.2mm	4.5mm
Capacitance pF	n/a	n/a	57pF	29pF	29pF	114pF
Transmission	85%	85%	85%	85%	85%	85%
Differential Propoation Delay	0.4 ns	1.2 ns	2.7 ns	1.4 ns	1.4 ns	1.4 ns
Contrast Ratio @ 633 nm	100:1	100:1	100:1	50:1	100:1	100:1
Contrast Ratio @ 1064 nm	150:1	150:1	150:1	100:1	150:1	150:1

Models EO-10 & EO-11 are HIGH SPEED modulators of traveling wave type which are used for wide bandwidth (DC to 1000 MHz) high frequency modulation, for AMPLITUDE modulating and PHASE modulating (high 48 mrad/V phase sensitivity). The modulators can handle RF power up to 10 watts and CW optical power up to 1 watt @ 1064nm.

Models EO-10-BR is a Brewster E-O PHASE modulator, which assures the lowest possible loss over the widest optical spectrum (600-3500nm). Aperture is 2mm. The configuration of the modulator can be like a resonant electro-optic modulator type or like a traveling wave type phase modulator with a bandwidth exceeding 1000 MHz.

Material: Lithium Tantalate crystal (LiTaO₃)

SPECIFICATIONS:

	EO-20	EO-21	EO-22	EO-23	EO-26	EO-28	EO-29
Spectral range nm	400-800	400-1100	400-800	400-1100	400-800	400-800	400-1100
Half wave voltage @ 488 nm	90V	65V	90V	65V	90V	180V	130V
Half wave voltage @ 633 nm	115V	85V	115V	85V	115V	230V	170V
Phase sensitivity @ 633 nm	27	36	27	36	27	13	18
Capacitance pF	180	250	a b	a b	a	80	120
Transmission @ 633nm	>90%	>90%	>90%	>90%	>90%	>90%	>90%
Frequency Response (-3 dB)	A	A	B C D	B C D	E	C	C
Aperture 2.5mm (3.5mm available)
Dimensions: 1.97" Dia × 8.90" L (EO-28 & EO-29: 1.97" Dia × 4.98" L)

¹The transverse mode: The electric field is applied normal to the direction of propagation of the light beam. The optical propagation direction for amplitude modulation is at an angle 450 to the Y or Z axis while the electric field is applied along the X axis.

a) Transmission line 50 ohm
b) Transmission line 100 ohm

A) DC-10 MHz
B) DC-25 MHz
C) DC-50 MHz
D) DC-100 MHz
E) Risetime 2 ns or less

SPECIFICATIONS:

	EO-320	EO-327	EO-331	EO-332	EO-333	EO-334	EO-361	EO-362
Half wave voltage @ 633 nm	750V	120V	750V	562V	450V	225V	900V	450V
Half wave voltage @ 1064 nm	1255V	188V	1255V	941V	750V	376V	1507V	750V
Aperture	2.5mm	2.5mm	3mm	3mm	3mm	3mm	6mm	6mm
Capacitance pF	11pF	90pF	14pF	18pF	23pF	45pF	23pF	45pF
50 ohm	n/a	yes	n/a	n/a	n/a	yes	n/a	n/a
100 ohm	n/a	yes	n/a	n/a	n/a	yes	n/a	n/a
Transmission	85%	85%	85%	85%	85%	85%	85%	85%
Connectors	pins	2 BNC	MHV	MHV	MHV	2 BNC	MHV	MHV
Diameter	25mm	50mm	50mm	50mm	50mm	50mm	50mm	50mm
Length	38mm	225mm	55mm	65mm	75mm	125mm	75mm	125mm

AMPLITUDE modulator, optimized for intensity modulation. PHASE modulator option available

Impedances available:

The modulator has some piezo-electric resonances in the 100-800 KHz fundamental frequencies (20% more than devices made from LiTaO₃)

The modulator can be converted into a POLARIZATION ROTATOR by adding an internal waveplate.

SPECIFICATIONS:

Wavelength	0.55-3.0 um
Aperture	2mm
RF Bandwidth	1-2%
Max RF Power	2 watt
Max Optical Power	1 watt/mm2
Modulation Depth	>0.1 Rad/Volt
Impedance	50 ohm
Half wave voltage	<20v
Connectors	SMA
Max VSWR	1.5:1
Efficient power transfer of the electrical energy to the electro-optic crystal.

Model EO-10-REM-BR is a Brewster resonant E-O PHASE modulator, which assures the lowest possible loss over the widest optical spectrum (500-3500nm). Aperture is 2mm. The configuration of the modulator can be like a resonant electro-optic modulator type or like a traveling wave type phase modulator with a bandwidth exceeding 1000 MHz.

Material: Lithium Tantalate crystal (LiTaO₃)

For information regarding electro-optic modulator drivers look up: Electro-Optic Modulator Drivers