Patent ID: 7292330

Claim:
An inspection tool, comprising: a deep ultra violet light source to emit deep ultra violet light; an optical detection device to receive deep ultra violet light; an optical channel through which deep ultra violet light from said deep ultra violet light source travels toward said optical detection device, said optical channel to include an item to be inspected; a digital micro-mirror device within said optical channel to reduce noise received at said optical detection device, said digital micro-mirror device located along said optical channel between said deep ultra violet light source and said item to be inspected, said digital micro-mirror device having a plurality of micro-mirrors each having its own adjustable tilt angle to be set to one of: a first position to reflect a portion of said deep ultra violet light into said optical channel; a second position to reflect a portion of said deep ultra violet light out of said optical channel; a second digital micro-mirror device within said optical channel to reduce noise received at said optical detection device, said second digital micro-mirror device located along said optical channel between said item to be inspected and said optical detection device, said second digital micro-mirror device also having a plurality of micro-mirrors each having its own adjustable tilt angle, said adjustable tilt angle to be set to: a third position to reflect a portion of said deep ultra violet light into said optical channel; a fourth position to reflect a portion of said deep ultra violet light out of said optical channel.