右-左PZT电压腔长变化3SaturationAbsorption57Multimode.PPTVIP

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2018-03-14 发布于天津
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右-左PZT电压腔长变化3SaturationAbsorption57Multimode.PPT

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右-左PZT电压腔长变化3SaturationAbsorption57Multimode

* * Lecture 9 §5.6 Hole-Burning and The Lamb Dip in Doppler- Broadened Gas Laser I. Doppler Effect §5.6 Hole-Burning and The Lamb Dip in Doppler-Broadened Gas Laser II. Hole-Burning 0 Assume laser oscillate at §5.6 Hole-Burning and The Lamb Dip in Doppler-Broadened Gas Laser III. Lamb Dip 0 §5.7 Multimode Laser Oscillation and Mode Locking I. Mode Competition in Homogeneous Broadening Laser A) Mode Selection 1 2 3 Passive OpticalResonator HomogeneousBroadening Laser The ideal homogeneous broadened laser can oscillator only at a single frequency close to Self gain saturation Gain saturation from others B) Multimode Oscillation due to spatial hole burning §5.7 Multimode Laser Oscillation and Mode Locking Longitudinal mode spatial competition Gas Laser, rapid movement eliminates spatial hole burning Single mode only In solid state Laser, spatial hole burning exist Multimode possible II. Multimode Oscillation in Inhomogeneous Broadening Laser §5.7 Multimode Laser Oscillation and Mode Locking 2 1 Passive OpticalResonator InhomogeneousBroadening Laser 3 when , and compete to each other Mode competition occurs at oscillation modes share the same part of inversion particles, for example: III. Methods for Mode Selecting §5.7 Multimode Laser Oscillation and Mode Locking Transverse Mode Selection -- select fundamental mode depress high order modes TEM00 1. Resonator parameter selection Metastable cavity 3. Small hole iris selection 2. Unstable resonator selection Suit for high gain media B) Longitudinal Mode Selection -- select single longitudinal frequency §5.7 Multimode Laser Oscillation and Mode Locking 1. Short Length Resonator 2. Traveling Wave Resonator No spatial hole burning exists 3. FP Etalon 4. Hybrid Resonator Fox-Smith interferometer L2 L3 IV. Frequency Stabilization §5.7 Multimode Laser Oscillation and Mode Locking Passive frequency stabilization Feed back through electri