Researches On Generation Of Some Novel All-solid-state CW And Ultrafast Lasers

As a cutting-edge technology, ultrafast laser has become one of the mostactivefields in laser research. It is widely recognized that Yb³⁺/Nd³⁺-doped crystalshave asignificant potential in the development of directly diode-pumped high-powerandultrashort lasers, compared with the conventional ultra-fast laser which is basedonTi:sapphire crystal and equipped in specialized laboratories due to its complexity,highcost and low efficiency. This paper focused on the diode laser pumped novelallsolid-state ultrafast laser sources with high efficiency, low cost, compact structureandreliability.The main research works and the innovation results are summarized as fellows:1．Experimental study on new laser ceramics Yb:(Y_0.9La_0.1)₂O₃. With a5at.%Yb:(Y_0.9La_0.1)₂O₃sample, we had obtained1.73W CW laser under an absorobed pumppower of4W at976nm, corresponding to an optical-to-optical efficiencyof42.6%andmaximum slope efficiency of60.2%. It is the highest efficiency by using thid ceramics.By using a SESAM to start and sustain the mode-locking, stable laser pulses of730fs atrepetition rate65.5MHz had been obtained with dispersion compensation. Themaximum outputpower was92mW and the central wavelength was1033nm. To ourknowledge, this is the first time to achieve the mode-locked femtosecond laser operationby using the Yb:(Y_0.9La_0.1)₂O₃ceramics.2. Experimental study on new laser crystal Nd:CGB. With a1at.%Nd:CGB crystal, wehad achieved616mW CW laser at the centre wavelength of1064nm under an pumppower of8W at808nm, the FWHM is about12nm. While under an pump power of12W at885nm, we had got155mW CW laser operation, the FWHM is about3nm.3. A diode-pumped tunable CW Nd:LGS laser at quasi-three-level has beendemonstrated. The output power up to403mW at the central wavelength of904nmwas obtained, corresponding to a slope efficiency of29.7%. We tuned the laserwavelength within the spectral range of899.8to906.6nm with an etalon inserted intothe V-type cavity. To the best of our knowledge, it is the first time to obtain a tunablelaser based on the⁴F_3/2-⁴I_9/2transition of Nd³⁺-doped crystals.