Thermal management of fiber-coupled-diode pumped tm:ylf laser crystal slab

Download

index.pdf

Date

2014

Author

Baltacıoğlu, Mert

Metadata

Show full item record

Item Usage Stats

261
views

118
downloads

In end-pumped solid-state lasers, thermal effects in the lasing medium are important factors in determining the limits of the maximum achievable power and the laser beam quality. In the present study, thermal effects such as the maximum and average temperatures, thermal lens radius and thermally induced stress on a fiber-coupled-diode pumped Thulium(Tm)-doped-YLiF_4 (YLF) laser crystal slab with unity aspect ratio are investigated for different cooling geometries. The thermal effects are simulated and compared for the laser crystal slab pumped by Gaussian and top-hat incident pump profiles with one side surface, two parallel opposite side surfaces and all four side surfaces being used as the heat dissipating surfaces. The case with four heat dissipating side surfaces yielded significantly better results in terms of thermo-optical effects compared to those of the other two cooling cases. Also the top-hat pump profile outperformed the Gaussian profile in all cooling conditions. The introduction of crystal holders with different thermal conductivities on the steady-state thermal and thermo-optical performance of the slab is also investigated for all cooling cases. It is observed that the crystal holder acts as a constant steady-state conductive thermal resistance throughout the length of the crystal. Simulations favored the asymmetrically cooled 4-side cooling method. Accordingly, setups using two-stage holders are designed and experimented. The experimental data is found to be in agreement with the simulations. .

Subject Keywords

Lasers., Crystal optics., Solid-state lasers., Solid-state lasers

URI

http://etd.lib.metu.edu.tr/upload/12618191/index.pdf
https://hdl.handle.net/11511/24204

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Pumping chamber design in diode pumped solid-state lasers for maximum system efficiency and minimum optical distortion Zengin, Kubilay; Sayan, Gönül; Yelen, Kuthan; Department of Electrical and Electronics Engineering (2013) The beam quality and the system efficiency of a diode-pumped solid-state laser source are directly related to the thermal profile inside the laser crystal. The thermal profile in a laser crystal should be made uniform in order to reduce the negative effects of the thermal lens. However, the absorbed pump profile that forms a uniform thermal profile inside the gain medium may adversely affect the system efficiency. In this thesis, a computational and empirical method was developed for designing pumping chamb...
Simulation of thermal, mechanical and optical behavior of yag ceramics with increasing Nd3+ concentration under lasing conditions. Kenar, Necmettin; Öke, Gülay; Department of Physics (2007) Two-dimensional thermal, mechanical and optical simulations are carried out to investigate the effect of Nd3+ concentration on thermal, mechanical and optical behavior of Nd:YAG ceramic laser materials under continuous wave laser operation. In the analyses, rods are pumped longitudinally with laser diodes, in three, six, nine and twelve fold structures. Rods having diameters of 3 and 6 mm are pumped with 808 nm and 885 nm sources separately having Nd+3 concentrations of 0.6, 1, 2, 3, 4 and 6 at. %. Total ab...
Power stabilization of diode pumped solid state lasers by means of adaptive control of drive current Şentürk, Tayfun; Leblebicioğlu, Mehmet Kemal; Department of Electrical and Electronics Engineering (2019) Lasers provide precision and sensitivity for various applications. However, some fundamental properties make lasers very susceptible to external changes. When stability of laser parameters is required the traditional approach is to stabilize the working environment, such as strict temperature and climate control, mechanical isolation as well as damping of any vibration. This traditional approach is very difficult to implement in harsh industrial environments and almost impossible for many military applicati...
Time resolved Fabry-Perot measurements of cavity temperature in pulsed QCLs Gundogdu, S.; Pisheh, H. S.; Demir, A.; Gunoven, M.; Aydinli, A.; Sirtori, C. (The Optical Society, 2018-3-5) Temperature rise during operation is a central concern of semiconductor lasers and especially difficult to measure during a pulsed operation. We present a technique for in situ time-resolved temperature measurement of quantum cascade lasers operating in a pulsed mode at similar to 9.25 mu m emission wavelength. Using a step-scan approach with 5 ns resolution, we measure the temporal evolution of the spectral density, observing longitudinal Fabry-Perot modes that correspond to different transverse modes. Con...
Beam dynamic studies at accelerator system of gun for a self-amplified spontaneous emission free electron laser project Yildiz, H. Duran; Porsuk, D.; Yıldız, İlker; Cakir, R. (2022-01-01) One of the important factors in high radiation generation facilities is the production of a high quality electron beam. To do that, the requirements of an optical electron source, such as current, radiation emission, etc. must be met. For this purpose, cavity beam dynamics studies of 1.4, 1.5, 1.6 and 1.8-cell SRF gun were performed. In addition, detailed studies have been made on the solenoid design and the location of the solenoid along the beam path. A design with the most optimized cavity geometry and R...

Citation Formats

M. Baltacıoğlu, “Thermal management of fiber-coupled-diode pumped tm:ylf laser crystal slab,” M.S. - Master of Science, Middle East Technical University, 2014.