Abstract
We developed a dynamic model for evaluating the gain and amplified spontaneous emission of multipass ultrashort-pulse laser amplifiers. This model takes into account the time dependence of the population inversion that is due to the time-varying pump power and the evolution of the amplified spontaneous emission. For gain media of a short upper-state lifetime, a time-dependent analysis is essential for the model to extend beyond order-of-magnitude estimation. We verified the model with a femtosecond dye laser amplifier. The calculated output energy is accurate to within ±5% of the experimental data. We utilized this model to optimize the conversion efficiency of the dye laser amplifier under low-energy pumping. An efficiency of 2.3% is achieved with an optimal pump energy of only 4 ॖJ.
| Original language | English |
|---|---|
| Pages (from-to) | 7802-7808 |
| Number of pages | 7 |
| Journal | Applied Optics |
| Volume | 36 |
| Issue number | 30 |
| DOIs | |
| State | Published - 20 Oct 1997 |