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

Polychromatic Modulation System

		AOTF.nC-MOD.nC DESCRIPTION CAD DRAWINGS

FEATURES AND ADVANTAGES Up to 12 distinct visible lines High diffraction efficiency High extinction ratio Large separation angle Output chromatic colinearity Remote controlled (LCD display) and RS232 versions Low power consumption driver (single 24 VDC supply) Rack version 110/230 VAC Accessories available (windows, Post Mount, etc.)

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The AOTF.nC is a special acousto-optic tunable filter which uses the anisotropic interaction inside a tellurium dioxide crystal to control independently and simultaneously different lines from an incoming laser light (white laser, Ar+, Kr+, HeNe, DPSS, etc.)

Up to 12 distinct lines can be mixed and separately modulated in order to generate different colorimetric patterns. The specific crystal cut of the AOTF.nC produces good diffraction efficiency (>90%), narrow resolution (1-2nm), low cross-talk between lines, and high extinction ratio.

The large separation angle between 0 and 1st orders, as well as the excellent output chromatic colinearity (<0.2 mrd over 450-700 nm) make this AOTF a powerful tool for free space or fiber pigtailed applications. The associated thermal stabilization maintains stable diffraction efficiency and dramatically reduces beam drift with single mode fiber pigtailing. This is a major advantage for high sensitivity applications.

The associated driver MOD.nC, based on PLLs (Phase Locked Loop), has been specially designed in order to exploit the best of the AOTF.nC features. The compact, single power supply design, low RF emissions and ease of user will satisfy the most demanding of applications. Thanks to its complete numerical design and integrated microcontroller, setting up is fast, simple and repeatable. Access to and adjustments of functions is simple with either a bright LCD display (with remote control adjustment) or through an RS232 serial link (with computer control). All parameters are stored in an EEPROM and are automatically loaded after each switch on. Each line is externally controlled by a distinct modulation input signal which can be TTL or analog. Additionally, all lines can be simultaneously controlled by a blanking signal which produces smooth effects without modifying the colormetric balance. The combination of the modulation input and blanking signals provides the best extinction ratio performance (>140 dB).