Dissertation > Excellent graduate degree dissertation topics show

Experimental Study on Cr2+:ZnS Laser and Its Use as Saturable Absorber

Author: ChenZhaoYu
Tutor: JuYouLun
School: Harbin Institute of Technology
Course: Optical Engineering
Keywords: 2.4μm solid laser Ho laser passively Q-switched laser Cr2+:ZnS
CLC: TN248.1
Type: Master's thesis
Year: 2013
Downloads: 2
Quote: 0
Read: Download Dissertation

Abstract


As the booming of diode pumped2μm wavelength solid laser, it is widely used inlaser radar, remote sensing and medical industry etc.. This paper mainly focus on thelaser which can output continuous wave with the Cr2+:ZnS crystal as the gain mediumand its application in2μm lasers as saturable absorber, the study is divided intotheoretical study and practical one.Two main aspects exist in theory. First, study and analysis on the optical propertyand luminous mechanism of Cr2+:ZnS crystal and other materials with adulteration ofCr2+ionic which provides a foundation on the study of continuous light laser with theCr2+:ZnS crystal as the gain medium; second, a model of rate equation is got from theanalysis of the rate equation of the Cr2+:ZnS saturable absorber under the passively Q-switched laser which shows the formula of the peak power, pulse width, pulse energyand energy efficiency of Q-switched pulse. All the above gives instructions to the actualexperiments.Experiments covers two aspects. First is the experiment on the Cr2+:ZnS laser. Astudy on the Tm:YLF laser as a pump source of1.89μm is made aiming to know theimpact on the output power by different wavelength selection type and different outputcoupler transmittance, from the above an optimized output scheme and a max outputpower of30W and slope efficiency of more than40%are achieved. Then the selectedTm:YLF laser is used to pump the Cr2+:ZnS crystals and analyse the features of outputpower with different cavity length and get a max output power of1.06W. Second is theexperiment on the Cr2+:ZnS as saturable absorber, what’s more separate passively Q-switched experiments are conducted with Ho:YAG，Ho:YVO4and Ho:YLF lasers. Thewriter analysed the differences of pulse energy, pulse width and repetition frequencywhen the aturable absorber is in different positions with the pump power increasing. Asthe repetition frequency of the Ho:YAG laser is approximate10kHz, the maximumaverage power is16.6W, the min pulse width is about36ns, and the maximum energyof a single pulse reaches2.6mJ. The single pulse energy from the Ho:YVO4laser isabout0.2mJ, and min pulse width of19.5ns and average output power of4.6W can begot from the pulse signal with a maximum repetition frequency of about20kHz. TheHo:YLF laser provides a maximum pulse energy of1.74mJ and min. pulse width of13.4ns. As the repetition frequency is1.90kHz which is the maximum one, thecorresponding average power reaches4.0W.In the end, conclusion and analysis is made on the experiments and suggestions aregiven for existing problems and further study.

Related Dissertations

  1. Theoretical and Experimental Studies on 1123 nm Nd:YAG Ceramic Lasers,TN248.1
  2. Study on 2μm Injection-locked Solid State Laser,TN248.1
  3. Research on Injection-seeded Holmium Single-doped Laser,TN248.1
  4. Optimization Research on Key Parameters of All Solid-state High Repetition Q-switched Lasers,TN248.1
  5. Research on Output Properties of LD Pumped All-Solid-State Passive Q-switching Tm3+,Ho3+ Laser,TN248
  6. Study on Tm, Ho Laser and 8～10 μm ZnGeP2 Optical Parametric Oscillator,TN248
  7. Research on Temprature Controling Technology of Laser Diode with Thermoelectric Cooler,TN248.4
  8. Erbium-doped fiber amplifier pump laser drive source research applications,TN248
  9. The research direction of lamp pumped laser,TN248
  10. Theoretical and Experimnetal Research on Laser Diode Pumped Nd: YVO4/BIBO All Solid State Blue Lasers,TN248
  11. Optical Parametric Oscillator and Its Frequency Doubling to Achieve Three Primary Colors RGB Solid-state Lasers,TN248
  12. Study characteristics neodymium-doped vanadate laser crystals 0.91μm continuous wave,TN248
  13. Research on the Stress Analysis of Vacuum Box and Resonator Stability for High Power CO2 Laser,TN248
  14. Thulium-doped Fiber Laser Technology,TN248
  15. Study on LD Pumped All-Solid-State 532nm Pulse Laser,TN248
  16. Research on the Thermal Effects of Nd: YAG Laser,TN248.1
  17. Study on the Laser Characteristic of Tm3+-doped Double-cladding Fiber,TN248
  18. Research of Spectral Beam Combining Technology for High Power Fiber Lasers,TN248
  19. Study on the Output Characteristic of High Power Long-Pluse Solid-State Laser,TN248
  20. Coupled Optical Design Used for Nd:YVO4 Laser End-pumped by a Laser Diode,TN248
  21. Study on Narrow-linewidth Yb-doped Fiber Laser,TN248
  22. Study of Pulse Tunable Fiber Laser,TN248

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Laser technology, the maser > Laser > Solid-state lasers
© 2012 www.DissertationTopic.Net  Mobile