| 摘要 |
An apparatus ( 10 a) for scanning a light beam ( 16 ) through a crystal arrangement (22) that has a first frame member ( 28 ), a first support member ( 24 ) to support a first optical element (18) in the first frame member ( 28 ) and a drive mechanism ( 32 ) to rotate the first support member ( 24 ). The first support member ( 24 ) is rotatably mounted in the first frame member ( 28 ). The first optical element ( 18 ) is arranged to receive the light beam ( 16 ). The first optical element ( 18 ) is supported by the first support member ( 24 ) so that the first optical element ( 18 ) is rotatable with the first support member ( 24 ). The first optical element ( 24 ) is tiltable about a diametral line of the first optical element ( 18 ), relative to the axis of the light beam (16) to be scanned through the crystal arrangement ( 22 ). A frequency conversion apparatus ( 50 ) provides a first crystal set ( 52 ) and a second crystal set ( 54 ). Each of the first and second crystal sets ( 52, 54 ) has at least one non-linear optical crystal. The first crystal set ( 52 ) receives a beam ( 16 ) of coherent radiation that passes through the first crystal set ( 52 ). The second crystal set ( 54 ) receives the beam ( 16 ) after it passes through the first crystal set ( 52 ), and the beam ( 16 ) then passes through the second crystal set ( 54 ). One of the first and second crystal sets ( 52, 54 ) is aligned for frequency conversion of the beam ( 16 ) in the cold state of that crystal set and the other one of the first and second crystal sets ( 52, 54 ) is aligned for frequency conversion of the beam (16) in the warm steady state of that other crystal set.
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