We report the results from the first operation of a free electron laser (FEL) driven by an electron beam from a laser-irradiated photocathode. The Rocketdyne/Stanford FEL achieved sustained oscillations, lasting in excess of three hours, driven by photoelectrons accelerated by the Stanford Mark III radiofrequency linac. A LaB/sub 6/ cathode, irradiated by a tripled Nd: Yag mode-locked drive laser was the source of photoelectrons. The drive laser, operating at 95.2 MHz, was phase-locked to the 30th subharmonic of the S-band linac. Peak currents in excess of 125 A were observed and delivered to the Rocketdyne 2 m undulator which was operated as a stand-alone oscillator. Sustainable small-signal gain of 100% per pass was observed over a 2 h time period with periodic observation of small-signal gain as high as 150% per pass. Preliminary estimates of the electron-beam brightness deliverable to the undulator range from 3.5 X 10/sup 11/ to 5.0 X 10/sup 11/ A/(rad M)/sup 2/ .
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机译：我们从由电子束从激光照射的光电阴极驱动的自由电子激光器（FEL）的第一操作报告结果。 Rocketdyne / Stanford Fel实现了持续的振荡，持续超过三个小时，由Stanford Mark III射频Linac加速的光电驱动。通过三倍的Nd：YAG模式锁定驱动激光照射的Lab / Sub 6 /阴极是光电子的源极。在95.2MHz下操作的驱动激光相锁定到S频带LINAC的第30个次谐波。观察到超过125A的峰值电流，并送到Rocketdyne 2 M起波纹，其作为独立振荡器操作。在2小时的时间段中观察到每次通过的可持续小信号增益100％，周期性观察小信号增益，每次通量高达150％。将电子束亮度的初步估计可从3.5×10 / sup11 /〜5.0×10 / sup 11 / a /（rad m）/ sup 2 /。
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