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High peak power passively mode-locked VECSELs
| Content Provider | Semantic Scholar |
|---|---|
| Author | Aschwanden, Alex |
| Copyright Year | 2004 |
| Abstract | This thesis presents the development of optically pumped passively modelocked vertical external-cavity surface-emitting lasers (VECSELs) with high average output powerand at repetitionrates between 1.5 GHz and 10 GHz. Although semiconduetor lasers were opticallypumped alreadyin the early stage after the inventionof the laser, optical pumping of semiconduetor lasers was not of large interest in science and industryuntil it came apparent thathigh continuous wave (cw) output power with good beam quality was achievable with the opticallypumped external-cavity approach. Up to 30 W cw output powerhas recently beendemonstrated by an opticallypumpedVECSEL. Optically pumped and passively mode-lockedVECSELs have the potential to generatepulseswith high average powereven at high repetitionrates, due to the low gain Saturation fluence, which drastically reduces Q-switch mode locking (QML) in VECSELs compared to solid-state lasers. The first passively mode-lockedVECSEL was demonstrated in the year 2000. Within two years after the first demonstration,the output powers of mode-lockedVECSELs had reached the 1 W level. However, the pulse durationsobtained in these early experiments spanned a wide ränge from nearly transform-limited 3.2 ps up to strongly chirped 27 ps, even in one single device. The characteristics of the pulses depended strongly on a variety of operating conditions like the power level and the temperature. The reasons for this were not clear at that time, and it soon became apparent that a deeper understanding of the mode locking mechanics in VECSELs had to bedeveloped. Simulationsas discussedin this thesis predict that with proper dispersion managementin the laser, the chirp can be reduced considerablyand short and |
| File Format | PDF HTM / HTML |
| DOI | 10.3929/ethz-a-004876614 |
| Alternate Webpage(s) | https://www.research-collection.ethz.ch/bitstream/handle/20.500.11850/148404/eth-27586-01.pdf;jsessionid=433BDECF430CD1995E2EA9D0D992C491?sequence=1 |
| Alternate Webpage(s) | https://www.research-collection.ethz.ch/bitstream/handle/20.500.11850/148404/eth-27586-01.pdf?isAllowed=y&sequence=1 |
| Alternate Webpage(s) | https://doi.org/10.3929/ethz-a-004876614 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
