Coherent light generators – Particular beam control device – Optical output stabilization
Patent
1998-09-02
2000-03-14
Scott, Jr., Leon
Coherent light generators
Particular beam control device
Optical output stabilization
372 25, 372 10, H01S 313
Patent
active
060382414
ABSTRACT:
A pulsed-laser includes a pump-light source, a gain-medium and a Q-switch. The Q-switch has an on-mode in which it is substantially transparent, and an off-mode in which it is normally substantially opaque. A gate-signal switches the laser between a ready-mode in which no pulses are delivered and a pulse-drive mode in which pulses are delivered. A first-pulse controller is provided for controlling the energy in the first of a series of pulses to be delivered by the laser. The first-pulse controller controls the first pulse energy by operating one or more of the Q-switch and the pump-light source in such a way that after switching from the ready-mode to the pulse drive mode the energy in the gain-medium at the instant of triggering the first pulse in the series of pulses is about the same that which will be reached in the gain-medium prior to triggering of subsequent pulses in the series. In this way, all pulses in the series have the about the same energy. Operation of the Q-switch may include raising its transmission value during its off-mode to allow a relatively low level of laser action for depleting energy stored in the gain-medium.
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Kneip Axel
Von Elm Rudiger
Coherent Inc.
Jr. Leon Scott
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