GSI Group Introduces New CircuitTrim™ Platform
for Thick and Thin Film Laser Trim

WILMINGTON, MA, November 2003 — GSI Group Inc. (Nasdaq: GSLI and TSX: GSI) announces the release of a new platform for addressing thick and thin film laser trim applications. From its larger work area and updated positioning system to its new software and user controls, the small footprint CircuitTrim™ LT2100 series provides a new level of versatility and flexibility.

Laser trim is a safe, highly accurate micromachining technique which can be used to fine-tune electronic devices and circuits. The new CircuitTrim LT2100 performs trim and test of thick film components and circuits, including PCBs, SMT components, and hybrids. The new CircuitTrim LT2110 performs trim and test of thin film resistors, resistor networks, and other thin film applications.

The new platform utilizes a stiffer frame for greater process stability, a new air-bearing stage for positioning in X, Y, and theta, accommodation for parts up to 10 x 12 in., a high-speed pattern recognition system for precision beam placement and part alignment, and fully-integrated test functions. Its modular design provides versatility through an advanced diode-pumped laser for processing in IR and green wavelengths, a selection of cutting lenses, and an enhanced Windows® 2000 operating system.

According to Paul Chase, Product Manager for the company’s CircuitTrim products, “With the release of the new CircuitTrim LT2100 platform, we are applying our most advanced designs in electronics, optics, lasers, mechanical structure, and software to provide what we believe is the most accurate, versatile, and flexible laser trimming system ever offered for hybrid circuits, resistors, and resistor networks.

GSI Group Inc. supplies precision motion control components, lasers and laser-based advanced manufacturing systems to the global medical, semiconductor, electronics, and industrial markets. GSI Group’ common shares are listed on Nasdaq (GSLI) and The Toronto Stock Exchange (LSI). For more information on GSI Group, please visit www.gsig.com.