Abstract
Using a new experimental geometry, we have proved for the first time that the generation of spatial subharmonic gratings in photorefractive crystals is not dependent on optical nonlinearity. We present results which confirm that the subharmonic gratings result from a parametric excitation of ultra low-frequency eigenmodes of a crystal by a time modulated fundamental grating.
| Original language | English |
|---|---|
| Pages (from-to) | 3082-3084 |
| Number of pages | 3 |
| Journal | Physical Review Letters |
| Volume | 73 |
| Issue number | 23 |
| DOIs | |
| Publication status | Published - 1994 |
Keywords
- experimental geometry
- spatial subharmonic gratings
- photorefractive crystals
- optical nonlinearity
- subharmonic gratings
- parametric excitation
- ultra low-frequency eigenmodes
- time modulated fundamental grating