Study On High Power Ti: Sapphire Laser And Its Frequency Conversion

The job discussed in this thesis has been done for Broadband Output IntracavityOptical Parametric Oscillator(OPO) with Ti:saphire-PPLN supported by ChinaNational Science FoundationTunable broadband light source has been applied for kinds of important fields,such as optical communication, photodynamic, optical computing, environmentalmonitoring and surveillance, optical coherence tomography, laser remote sensingtechnique, laser radar and spectroscopy. It could work in WDM (Wavelength DivisionMultiplex) system of optical communication as signal source, signal converter oramplifier. For environment monitoring and surveillance, multi-wavelength fromtunable source could meet the atmospheric window condition and pass through theatmosphere under kinds of condition in order to optimize the SNR (signal-to-noiseratio) and detect the components in atmosphere with high degree of accuracy. Soscientists and engineers all over the world are always focusing on the researches intunable laser. With rapid development, tunable laser technique becomes one of themost active aspects in laser technique.The main achievements in this thesis are shown as below:i.Study on high power, QCW, intracavity frequency-doubled Nd: YAG laserpumped by LD. Discuss on the basic principles of the design of oscillate cavity.Achieve the operation with high conversion efficiency, high light quality and highstability.ii.Study on all solid state, QCW Ti: sapphire laser. Apply all solid state, QCW,intracavity frequency-doubled Nd: YAG laser as the pump source. Study theoutput characters such as polarization and the width of pump light, the width ofpump and operation temperature. Acquire high output power, high light qualityTi: sapphire laser with suitable oscillate cavity. Now the maximum output poweris 6.0W, which is the highest index in this field.iii.After investigating the property of birefringent filter (BF), we tune thebroadband Ti: sapphire laser. At present, we achieve the average tuned power of3.7W from 750~850nm and the maximum narrowband output power of 4.2W at797nm, these indexes also top this field so far.iv.Research on the intracavity frequency-doubled Ti: sapphire-blue-violet laser.Discuss the advantage and disadvantage of some familiar frequency-doubledcrystal such as BBO, LBO and PPLN in the specified Ti: sapphire secondharmonic generation.v.Study on QPM (quasi-phase-matched) pump wavelength-tuned OPO with Ti:sapphire-PPLN. Under the phase matched condition of QPM, we study thecharacters of PPLN-OPO pumped by tunable laser and obtain the maximumPPLN-OPO output band with suitable pump wavelength and poled period.