Abstract
Optical-heterodyne measurements are made on ∼842-nm signal output of an injection-seeded optical parametric oscillator (OPO) based on periodically poled KTiOPO4 pumped at 532 nm by long (∼27-ns) pulses from a Nd:YAG laser. At low pump energies (≤ 2.5 times the free-running threshold), the narrowband tunable OPO output is single-longitudinal-mode (SLM) and frequency chirp can be <10 MHz, much less than the transform-limited optical bandwidth (∼17.5 MHz). We explore the transition from SLM operation to multimode operation as pump energy or phase mismatch are increased, causing unseeded cavity modes to build up later in the pulse.
| Original language | English |
|---|---|
| Pages (from-to) | 5655-5660 |
| Number of pages | 6 |
| Journal | Optics Express |
| Volume | 12 |
| Issue number | 23 |
| DOIs | |
| Publication status | Published - 2004 |