Research On All Solid State, Quasi-CW, Tunable Ti:sapphire Laser And Its Application In PPLN-OPO

The job discussed in this thesis has been done for Broadband Output Intracavity Optical Parametric Oscillator(OPO) with Ti:saphire-PPLN supported by China National Science Foundation and Pump Wavelength-tuned Optical Parametric Oscillator with Ti:saphire-PPLN, one of Tianjin Foundation Research Projects for Application. Tunable broadband light source has been applied for kinds of important fields, such as optical communication, photodynamic, optical computing, environmental monitoring and surveillance, optical coherence tomography, laser remote sensing technique, laser radar and spectroscopy. It could work in WDM (Wavelength Division Multiplex) system of optical communication as signal source, signal converter or amplifier. For environment monitoring and surveillance, multi-wavelength from tunable source could meet the atmospheric window condition and pass through the atmosphere under kinds of condition in order to optimize the SNR (signal-to-noise ratio) and detect the components in atmosphere with high degree of accuracy. So scientists and engineers all over the world are always focusing on the researches in tunable laser. With rapid development, tunable laser technique becomes one of the most active aspects in laser technique. The main achievements in this thesis are shown as below:Study on high power, QCW, intracavity frequency-doubled Nd: YAG laser pumped by LD. Discuss on the basic principles of intracavity frequency-doubled laser and the design of oscillate cavity. Achieve the operation with high conversion efficiency, high light quality and high stability. Study all solid state, QCW Ti: sapphire laser. Use all solid state, QCW, intracavity frequency-doubled Nd: YAG laser as the pump source. Study the output characters with the polarization and the width of pump light, the width of pump and operation temperature. Acquire high output power, high light quality Ti: sapphire laser with suitable oscillate cavity. Now the maximum output power is 4.7W, which is the highest index in China. Study on QMP (quasi-phase-matched), pump wavelength-tuned OPO with Ti: sapphire-PPLN. Under the phase match condition of QPM, study the characters of PPLN-OPO pumped by tunable laser. Obtain the maximum scale PPLN-OPO output with suitable pump wavelength and poled period.