High power continuous wave Nd:KGW laser with low quantum defect diode pumping

dc.contributor.authorTalukder, Rubel Chandra
dc.contributor.examiningcommitteeShafai, Cyrus (Electrical & Computer Engineering); Hu, Can-Ming (Physics)en_US
dc.contributor.supervisorMajor, Arkady (Electrical & Computer Engineering)en_US
dc.date.accessioned2016-09-14T01:10:33Z
dc.date.available2016-09-14T01:10:33Z
dc.date.issued2016en_US
dc.degree.disciplineElectrical and Computer Engineeringen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractHigh power diode-pumped solid state (DPSS) lasers are a rapidly growing technology that is attractive for various applications in scientific and industrial fields. DPSS lasers are highly efficient, reliable and durable with superior beam quality when compared to flash-lamp pumped solid state lasers. Double-tungstate crystal of neodymium-doped potassium gadolinium tungstate (Nd:KGW) is one of the most effective active media used in DPSS lasers for generation of continuous wave radiation and ultrashort (i.e. picosecond, 10-12 s) pulses. Unfortunately, the thermal conductivity of KGW host crystals is relatively low (~3 Wm-1K-1). This low thermal conductivity and large quantum defect while pumping with ~808 nm lead to significant thermo-optical distortions. One way to minimize thermo-optical distortions is to reduce the quantum defect. This can be done by pumping at longer wavelengths as compared to conventional 808 nm. In this work we demonstrate what we believe is the first continuous wave Nd:KGW laser with hot band diode pumping at ~910 nm. This pumping wavelength reduced the quantum defect by >46% as compared to the conventional ~808 nm pumping and resulted in significantly lower thermal lensing. The laser produced 2.9 W of average output power at 1067 nm in a diffraction limited beam for an absorbed pump power of 8.3 W. The slope efficiency and optical-to-optical efficiency were found to be 43% and 35%, respectively. Significant reduction of quantum defect offered by this pumping wavelength and availability of suitable high power laser diodes opens an attractive way to further power and efficiency scaling of the Nd:KGW lasers.en_US
dc.description.noteOctober 2016en_US
dc.identifier.citationR. C. Talukder, Md Z. E. Halim, T. Waritanant, A. Major, “Multiwatt continuous wave Nd: KGW laser with hot-band diode pumping,” Optics Letters 41, 3810-3812 (2016).en_US
dc.identifier.citationR. C. Talukder, Md Z. E. Halim, T. Waritanant, A. Major, “Multi-Watt Continuous Wave Nd: KGW Laser With Hot Band Diode Pumping,” CLEO: Science and Innovations, 2016.en_US
dc.identifier.citationR. C. Talukder, Md Z. E. Halim, T. Waritanant, A. Major, “Continuous Wave Nd: KGW Laser With Hot Band Diode Pumping,” Photonics North-2016.en_US
dc.identifier.urihttp://hdl.handle.net/1993/31739
dc.language.isoengen_US
dc.publisherOptical society of Americaen_US
dc.rightsopen accessen_US
dc.subjectNd:KGW, Quantum defect, Continuous waveen_US
dc.titleHigh power continuous wave Nd:KGW laser with low quantum defect diode pumpingen_US
dc.typemaster thesisen_US
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