The GT61A ArF laser light source with ultra line narrowed spectrum, which meets the demand of hyper NA (NA > 1.3)
immersion tool, is introduced. The GT61A aims at improving spectrum performance from value E95 0.5pm of GT60A.
The spectrum performance 0.3pm or less was achieved by developing an ultra line narrowing module newly.
Moreover, in 45nm node, since it indispensably requires OPC (optical proximity correction) and a narrower process
window, improved stabilization of spectrum performances was performed by bandwidth control technology. Newly
designed Bandwidth Control Module (BCM) includes high accuracy measurement module which support the narrower
bandwidth range and active bandwidth control module. It also contributes to the reduction of the tool-to-tool differences
of the spectrum for every light source.
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