Abstract
A Nd:YAG microchip laser array is developed and the spatial phase correlation among each the microchip laser is attained utilizing the Talbot effect in a three-mirror cavity configuration. The laterally coupled Nd:YAG microchip laser array produces a pair of spots with angular separation of λ/d in its far field, where d is the distance between the adjacent sources, corresponding to an out-of-phase spatial mode coupling. The far field spot size is reduced by a factor of 4.7 compared with that obtained by incoherent adding of the individual microchip lasers. Although an external mirror positioned at the 1/4 Talbot distance from the microchip lasers source is very effective to introduce the coherence among the laser chips, the present long Talbot distance limits the output laser power due to the extremely high diffraction loss in the auxiliary cavity. Smaller beam sizes for each microchip lasers will decrease the filling factor and improve the efficiency in the Talbot cavity.
| Original language | English |
|---|---|
| Pages (from-to) | 31-38 |
| Number of pages | 8 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 3267 |
| DOIs | |
| Publication status | Published - 1998 Dec 1 |
| Externally published | Yes |
| Event | Laser Resonators - San Jose, CA, United States Duration: 1998 Jan 26 → 1998 Jan 27 |
Keywords
- Coherent laser array
- LD-pumped solid-state laser
- Microchip laser
- Phase-locked array
- Talbot effect
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering