Abstract
A transient photocurrent model is developed to explain coherent terahertz emission from air irradiated by a symmetry-broken laser field composed of the fundamental and its second harmonic laser pulses. When the total laser field is asymmetric across individual optical cycles, a non-vanishing electron current surge can arise during optical field ionization of air, emitting a terahertz electromagnetic pulse. Terahertz power scalability is also investigated, and with optical pump energy of tens of millijoules per pulse, peak terahertz field strengths in excess of 150 kV/cm are routinely produced.
| Original language | English |
|---|---|
| Pages (from-to) | 4577-4584 |
| Number of pages | 8 |
| Journal | Optics Express |
| Volume | 15 |
| Issue number | 8 |
| DOIs | |
| State | Published - Apr 16 2007 |
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