Investigation and Exploitation of Anomalously Fast Heat Dissipation in Diamond
Abstract
The primary aim to determine the cause of the anomalously-high brightness of diamond lasers was addressed early in the Project by extending our research on long-pulse pumped diamond lasers. Using pulse durations sufficiently long to obtain a quasi-steady state thermal profile, we were able to identify a thermally-induced lens in diamond for the first time when using input pump powers up to 2.5 kW. The strength of the lens was determined by measuring the evolution of beam shape as a function of output power in tandem with beam propagation model. This work showed that the lens strength was consistent with a Fourier model for heat conduction, provided that the model included appropriate correction factors that take into consideration the shape and sizes of the pump and laser modes in the diamond. This result has diminished the need to invoke more exotic processes (such as ballistic phonons) to explain the high-power behaviour. The thermal model enabled the power scaling limits of diamond lasers to be modelled with much greater certainty, and designs for the next level of power (10 kW) to be proposed.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 09, 2022
- Accession Number
- AD1170061
Entities
People
- Richard P. Mildren
Organizations
- Macquarie University