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Study On Characteristics Of Laser-diode-pumped Tm:Y2O3 Ceramic Laser Around 2?m

Posted on:2019-07-25Degree:MasterType:Thesis
Country:ChinaCandidate:H WangFull Text:PDF
GTID:2348330569495112Subject:Optics
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Lasers emitting at 2?m which cover?eye safe?wavelength region have great potential applications in surgery,LIDAR systems,gas detection,plastics material processing.Furthermore,2?m lasers can be emplyed as the pumping sources of Cr2+lasers and mid-infrared optical parametric oscillators for generating 2.5?m and 3-5?m mid-infrared lasers.The main method of generating 2?m lasers is pumping Tm3+and Ho3+doped crystals,ceramic and so on with laser diodes or fiber lasers.Due to the fact that Tm3+ions can be directly excited with commercially available laser diodes around800 nm,Tm-doped solid-state lasers operating at 2?m wavelength region have attracted more and more attention.Transparent ceramics possess good optical,thermal,and better mechanical properties.Compared to single crystals,transparent ceramics can be fabricated with largesize,high dopant concentration,and composite structure in much lower temperature environments.In recent years,Tm3+lasers based transparent ceramic at2-?m wavelength has been demonstrated.In this paper,we studied the laser characteristics of Tm:Y2O3 ceramic laser operating at 2?m wavelength region,The main reserch contents are as follows:?1?The absorption spectrum and fluorescence Spectrum of Tm:Y2O3 ceramic were studied.By using a 785 nm laser diode as the pump source,a comparison of the laser performance of Tm:Y2O3 ceramics with 1at.%,2at.%and 3at.%Tm3+doping concentration was demonstrated.Better laser performance were achieved in a 2at.%Tm:Y2O3 ceramic.By Optimizing the resonant,the maximum output power of 7.25 W with a slope efficiency of 40%in CW mode was achieved and laser emission wavelength was locked at 2050nm.?2?The Q-switched laser characteristics of Tm:Y2O3 ceramic were studied.By using an acousto-optic Q-switcher,actively Q-switched Tm:Y2O3 ceramic laser was realized,the shortest pulse width of 115 ns at a repetition of 1 kHz was achieved.By using Ho:LuAG ceramic as a saturable absorber,a passively Q-switched Tm?Y2O3ceramic laser around 2050 nm was demonstrated for the first time.The maximum average output power was 497 mW.The shortest pulse width of 642 ns at the repetition rate of 33 kHz were achieved.Our works indicted that Ho-doped materials have good potential for passive Q-switching of Tm-doped lasers at 2-?m wavelength region.?3?Basing on a Volume Bragg grating,we demonstrated the laser characteristics of Tm:Y2O3 ceramic nalaser operating at 2.1?m.A volume Bragg grating was used as the wavelength sector and input mirror and obtain wavelength of Tm?Y2O3 ceramic laser locking at 2.1?m.By using gold nanorods as a saturable absorber,we obtained a passively Q-switched laser at 2.1?m.The maximum average output power was 455 mW.The shortest pulse width was 609 ns,corsponding a pulse repetition rate of 79 KHz.Our work provides a more efficient method for generating nanosecond laser operating at 2.1?m wavelength region.
Keywords/Search Tags:Tm:Y2O3, acousto-optic Q-switched, passively Q-switched, Ho:LuAG, VBG
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