ELECTRO-OPTICAL PRODUCTS CORPORATION
	62-40 Forest Avenue, 2nd Floor • Ridgewood, NY 11385, USA • Tel: 718-456-6000 • Fax: 718-456-6050 • www.eopc.com

Acousto-Optic Modulator/Shifter

		MQ-180-VIS  MQ-180-IR  MQ-180-DUV DESCRIPTION CAD DRAWINGS

FEATURES AND ADVANTAGES VIS range 446-633nm UV range 325-450nm or 244-300nm High speed analog/digital modulation High reliability High level of stability

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Acousto-optic modulators are used to vary and control laser beam intensity. A Bragg configuration gives a single first order output beam, whose intensity is directly linked to the power of RF control signal. The rise time of the modulator is simply deduced by the necessary time for the acoustic wave to travel through the laser beam. For highest speeds the laser beam will be focused down, forming a beam waist as it passes through the modulator.

EOPC offers a wide range of modulators with associated drivers. The set is optimized to offer the best performances (rise time, extinction ratio, etc.). The RF driver features all the necessary components to drive the modulator with analog or digital input control. Both a low cost OEM version and complete laboratory version (boxed) are offered. The laboratory version is a versatile turn-key tool for fast set-up and allows the user to have amplitude modulation capabilities from front panel (DC modulation) or from an external signal.

Up to 12 distinct lines can be mixed and separately modulated using a Polychromatic Modulation System.

Applications for acousto-optic modulators include laser printing, video disk recording, laser projection systems.

ACOUSTO-OPTIC
Model	MQ-180-VIS	MQ-180-IR	MQ-180-DUV
Material	fused silica
Acoustic Velocity (m/s)	5960 (typ)
Optical Wavelength Range (nm)	446-633	325-450	244-300
Optical Transmission1 (%)	>95	>95	>95   (typ 97)
Incident Polarization	linear | to baseplate
Aperture (mm × mm)	0.2 × 1
Diffraction Efficiency (%)	>=70	>=80	>=85
1st Order Ellipticity (%)	typ 92
Input Bragg Angle(mrad)	8@532nm	5.4@355nm	4@266nm
Separation Angle (mrad)         (order 0 - order 1)	16@532nm	10.7@355nm	8@266
Carrier Frequency (MHz)	180
Min Rise Time (ns/mm)        (beam dia 90 um)	10
Analog Amplitude Modulation   Bandwidth @ -3dB (MHz)	50
Static Extinction Ratio	<=1000/1
Max Optical Power Density                            (W/mm	>100
ELECTRICAL
Input Impedance (ohms)	50
Maximum RF Power (W)	<=4	<=2	<=1
V.S.W.R.	<1.5/1 (typ)
Associated Driver	MOD-180-4W MOD-180-2W MOD-180-1W
PHYSICAL/ENVIRONMENTAL
Connector Type	SMA
Size (mm × mm × mm)	50.9 × 22.4 × 15.8
Weight (g)	50
Cooling	air cooling
Operating Temperature (°C)	10 to 40