302 W quasi-continuous cascaded diamond Raman laser at 15 microns with large brightness enhancement
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2018-07-24 |
| Journal | Optics Express |
| Authors | Zhenxu Bai, Robert J. Williams, OndÅej Kitzler, Soumya Sarang, David J. Spence |
| Institutions | Macquarie University |
| Citations | 41 |
Abstract
Section titled āAbstractāWe report a second Stokes diamond Raman laser at 1.49 Ī¼m capable of high power and large-scale-factor brightness enhancement. Using a quasi-continuous 1.06 Ī¼m pump of power 823 W (0.85% duty cycle) and M<sup>2</sup> up to 6.4, a maximum output power of 302 W was obtained with an M<sup>2</sup> = 1.1 providing an overall brightness enhancement factor of 6.0. The pulse length of ~210 Ī¼s was selected to ensure operation was representative of steady-state continuous lasing conditions in the diamond bulk. Accompanying theoretical calculations indicate that even more strongly aberrated pumps may be used to efficiently generate high beam quality output and with higher brightness enhancement factors. This diamond-based beam conversion technique addresses needs for high brightness and efficient eye-safe sources using low-brightness 1 Ī¼m pumps and reveals a widely-applicable route to practical high brightness lasers of increased wavelength range.