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Studies On Compact Photon Sources

Posted on:2002-02-09Degree:DoctorType:Dissertation
Country:ChinaCandidate:S G GuoFull Text:PDF
GTID:1118360032952869Subject:Condensed matter physics
Abstract/Summary:PDF Full Text Request
The development of lasers is trending to the demands of applications. Much research work on compact photon sources with small size, light weight, high efficiency and high quality is being carried out. This thesis describes some work on improving the performance of lasers, which I have carried out during the past three years. Follows are the main points:1. Both Littrow and Littman set-up of 800nm-band external-cavity diode laser systems are studied. lOnm tuning range is achieved in the experiments.2. The influence of the positioning errors on tuning range in external-cavity diode laser system is analyzed in detail for the first time as my knowledge. An experimental system of 1.55um-band external-cavity diode laser system with more than 50nm mode-hop free tunable range is reported.3. For the first time, three types of sine structures for wavelength linear scale in grating spectrum instruments are described systematically. The tuning structures for wavelength linear scale in both Littrow and Littman set-up external-cavity laser diodes are designed.4. The tunable l.SSum external cavity laser diode by using fiber Bragg grating is reported. Utilizing cantilever beam tuning method, a tuning range 7nm is achieved. The side mode suppression ratio about 39dB is realized.5. A tunable cladding-pumped Yb3+-doped fiber laser system is reported. The Littrow grating tuning method is employed for the first time in double cladding fiber lasers. By tuning the angle of the grating, we have achieved a tuning range of more than 40nm.6. The designing theory of optical resonator for solid-state laser is developed based on Propagation-Circle - Transform-Circle Graphic Analytic Method. A novel resonator, "adaptive thermodynamic stable resonator", is described. The design principle of parameter of the resonator is introduced. A compact and flexible adaptive resonator is presented.7. A new conception "optical ballast" is introduced for the first time as our knowledge. Optical ballast can be used to decrease the variation of beam propagation characteristic due to the disturbance of refractive index of the medium. Two types of optical ballast are described.
Keywords/Search Tags:compact photon sources, tuning, external-cavity laser diode, sine structure, double-cladding fiber, fiber laser, solid-state laser, adaptive optical resonator, optical ballast
PDF Full Text Request
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