Also, with the use of wave guides, one eliminates the problem of intermittent focusing of the beam that is associated with the joystick device (Fig. Fine focusing can be done through a joystick or automatically with a coupler. With laparoscopy, the focal length is longer, taking into account the length of the laparoscope. With the hand-held attachment, the focal point is usually 10 cm away from the focusing lens. A lens system is used to focus the laser to a focal point. The laser beam comes out of the port as an unfocused beam. The CO 2 laser, in contrast, produces a wavelength of 10,800 nm, which is in the nonvisible part of the electromagnetic spectrum thus, a helium–neon laser is also used, which produces a red light to identify the location of the CO 2 beam. The KTP produces a wavelength of 532 nm, making its light a green color. The argon laser produces a wavelength of 510 nm, making a blue-green light. Actual view of a CO 2 laser tube ( below) and coincident helium–neon laser ( above ), which provides visible aiming target.ĭifferent colors are produced by different lasers.
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