公开(公告)号：US5212698A

公开(公告)日：1993-05-18

申请号：US787317

申请日：1991-10-30

申请人： James D. Kafka ,  Michael L. Watts ,  Shawn D. Streeby

发明人： James D. Kafka ,  Michael L. Watts ,  Shawn D. Streeby

IPC分类号： H01S3/098 ,  H01S3/136

CPC分类号： H01S3/1109 ,  H01S2301/08 ,  H01S3/0805 ,  H01S3/0811 ,  H01S3/1068 ,  H01S3/1112 ,  H01S3/136 ,  H01S3/139

摘要： A mode locked pulsed laser incorporates an intracavity element to compensate for the dispersion caused by other intracavity elements. This element reduces the tendency of the pulse to broaden in the cavity due to group velocity dispersion and results in very short pulses. In the laser of the present invention, mode locking is initiated by detecting the beat frequency between adjacent longitudinal modes using a high speed photodiode. This signal is amplified and then the frequency is divided by two. The signal is passed through an electronically adjustable phase shifter and then to a power amplifier. This signal is applied to the acousto-optic modelocker. If the cavity length drifts the beat frequency between the longitudinal modes changes. The rf signal applied to the modulator changes in exactly the right manner to track the drift in cavity length. Thus the modelocker is automatically synched to the round trip of the laser cavity.

摘要翻译： 锁模脉冲激光器包含腔内元件以补偿由其它腔内元件引起的色散。 该元件由于组速度分散而降低了腔内脉冲变宽的趋势并导致非常短的脉冲。 在本发明的激光器中，通过使用高速光电二极管检测相邻纵向模式之间的拍频来启动模式锁定。 该信号被放大，然后将频率除以2。 信号通过电子可调移相器，然后通过功率放大器。 该信号被应用于声光模式锁定器。 如果腔长度在纵向模式之间漂移拍频的变化。 施加到调制器的rf信号以正确的方式改变以跟踪腔长度的漂移。 因此，模式锁定器被自动地同步到激光腔的往返。

公开(公告)号：US5185750A

公开(公告)日：1993-02-09

申请号：US717367

申请日：1991-06-19

申请人： James D. Kafka ,  Thomas M. Baer ,  Mark S. Keirstead ,  Michael L. Watts ,  Horst W. Schaaf

发明人： James D. Kafka ,  Thomas M. Baer ,  Mark S. Keirstead ,  Michael L. Watts ,  Horst W. Schaaf

IPC分类号： H01S3/098 ,  H01S3/136

CPC分类号： H01S3/1109 ,  H01S3/0805 ,  H01S3/0811 ,  H01S3/1068 ,  H01S3/1112 ,  H01S3/136 ,  H01S3/139

摘要： A mode locked pulsed laser incorporates an intracavity element to compensate for the dispersion caused by other intracavity elements. This element reduces the tendency of the pulse to broaden in the cavity due to group velocity dispersion and results in very short pulses. In the laser of the present invention, mode locking is initiated by detecting the beat frequency between adjacent longitudinal modes using a high speed photodiode. This signal is amplified and then the frequency is divided by two. The signal is passed through an electronically adjustable phase shifter and then to a power amplifier. This signal is applied to the acousto-optic modelocker. If the cavity length drifts the beat frequency between the longitudinal modes changes. The rf signal applied to the modulator changes in exactly the right manner to track the drift in cavity length. Thus the modelocker is automatically synched to the round trip of the laser cavity.