| Autor: |
Md. Jarez Miah, Anisuzzaman Boni, Seval Arslan, Dominik Martin, Pietro Della Casa, Paul Crump |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
IEEE Photonics Journal, Vol 14, Iss 3, Pp 1-5 (2022) |
| Druh dokumentu: |
article |
| ISSN: |
1943-0655 |
| DOI: |
10.1109/JPHOT.2022.3165399 |
| Popis: |
GaAs-based, highly-efficient, kW-class, 1-cm laser bars with high peak power Popt and improved beam quality in quasi-continuous-wave mode are presented. The use of an extreme-triple-asymmetric (ETAS) epitaxial layer structure diminishes power saturation of high-power bars at high driving current. The resulting ETAS bars with 4 mm cavity produce a record 1.9 kW peak power, limited by available current supply, with a maximum power conversion efficiency ηE = 67% at THS = 25 °C heat-sink temperature. Both Popt and ηE have been increased further by operating the bars at THS = −70 °C. Sub-zero operation raises the Popt to 2.3 kW and the maximum ηE to 74%. A second configuration of ETAS bars with optimized lateral layout is further realized to obtain narrow lateral beam divergence θ up to 2 kA driving current, without sacrificing Popt and ηE. A 2–3° lower θ (95% power level) is observed over a wide operating range at room temperature. A high degree of polarization is also maintained across the whole operatingrange. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
