| 摘要 |
A lensless focusing device for receiving an unfocused laser beam and discharging a focused laser beam. The focusing device includes a solid body having an open interior defined by a conical inner wall extending from an inlet opening to a discharge opening. The conical inner wall is a polished or reflective surface that directs the input laser beam toward the discharge opening. The solid body can include a heating element to raise the temperature of the solid body relative to ambient. |
