High Power All-solid State Of Cr ~ (4 +): Yag Tunable Laser,

The Cr⁴⁺ :YAG laser have ability to operate at room temperature in the wavelength range from 1300 to 1600nm, which lies in the eye-safe region and optical communication region. And also the Kerr-lens mode-locked Cr⁴⁺:YAG laser can generate pulses with a duration of several tens femtoseconds at the center wavelength of 1.50μm. It is the perfect laser source of nonlinear optics and optical spectroscopy in the near infrared region. Therefore it is widely used in many fields, such as optical fiber communication technology, optoelectronic devices, optical soliton system, quantum communications, distance sensor, optical communication, optical spectroscopy, laser treatment, laser ranging, electro-optic countermeasure, laser technology et al.. Hence there is great scientific signification and application value in the research of tunable Cr⁴⁺:YAG laser. The main contents can be summarized as follows:1. The concept, category and laser materials of tunable laser are summarized; the research progress on Cr⁴⁺:YAG laser is discussed.2. Based on the rate equation theory, the characteristics of end-pumped solid state lasers are analyzed. The matching between pumping mode and oscillating mode is theoretically studied and numerically simulated through the location of focusing spot of pumping light, the divergence angle of pumping light, the beam size of pumping light and oscillating light, and the transmission rate of output mirror et al..3. The key mode-locked technology and the formation of initial pulse in mode-locked laser are analyzed. Based on the aberration-free theory and nonlinear ABCD matrix theory, theδparameter of Kerr-lens sensitivity and the cavity parameter of mode-locked laser are theoretically studied. Finally the starting element(SESAM) of mode-locked laser is introduced.4. The beam waist of pumping light is measured; the thermal effect of Cr⁴⁺:YAG crystal is theoretically analyzed; the thermo-lens focus is calculated and several methods to compensate the thermal effect are also summarized. These provide a theoretical basis and guide of our experiment. 5. The BF is designed. And the transmission is theoretically simulated.So the optimum thickness is obtained.6. The three-mirror cavity and the four-mirror cavity for cw and mode-locked Cr⁴⁺:YAG laser are designed.