The wavelength tunability has been demonstrated as one of the most prominent advantages of organic lasers.The development of integrated multifunctional organic lasers via facile manufacturing,and in-depth exploration of optical mechanism are crucial to the advancement of organic lasers.Based on the superior processability and wide gain spectra of organic gain media,the device manufacturing,multifunctional integrated design and optical amplification characteristics have been explored in depth from the perspective of wavelength tunability,which can tackle the problem of the cumbersome preparation processes and a single function of traditional organic lasers.In this thesis,organic laser devices with tunable wavelengths are designed and prepared based on the principles of period control,optical response,and nonlinear optics,which systematically investigate the lasing characteristics and the involved mechanism.The main research results have the following three points:(1)A multifunctional integrated photoresponsive organic laser with wavelength tunability is designed and prepared,in which amplified spontaneous emission(ASE)with optical response and wavelength tunability is realized in the blend system of laser gain medium and photochromic molecules.At the same time,the mechanism of wavelength regulation is elaborated.A strategy of preparing wavelength tunable lasers has been proposed,which provides new ideas for the design and innovation of multifunctional organic solid-state laser devices.(2)A simple methodology of effectively modulating the wavelength of organic lasers in the visible range has been proposed.The wavelength-tunable elastic organic distributed feedback(DFB)lasers are prepared via the transfer method,which can overcome the two technical difficulties of low yield and high temperature damage in the traditional flexible grating preparation technology.It is worthwhile to mention that the devices have the great advantages of simple operation,low temperature processing,high-precision and excellent material compatibility.Meanwhile,the devices possess an ultra-wide tuning range.(3)The interaction between ASE behavior and stimulated Raman scattering(SRS)of high-gain trapezoidal macromolecular organic laser materials is systematic studied.The effective tuning of SRS wavelengths is achieved by moving the excitation wavelength regularly.Meanwhile,the ASE threshold characteristics,SRS threshold characteristics and amplification characteristics at different excitation wavelengths are also investigated.In this way,the output of SRS signal with low threshold,high intensity,high signal-to-noise ratio and wideband pass is realized,manifesting an important application prospect in the field of sensor systems and optical communication. |