We demonstrate the growth,thermal,spectroscopy and laser performance of an Er3+doped Gdo.iYo.9AlO3(Er:GYAP)disorder crystal grown by Czochralski method.The crystal with space group Pbnm and lattice parameters of a=0.5...We demonstrate the growth,thermal,spectroscopy and laser performance of an Er3+doped Gdo.iYo.9AlO3(Er:GYAP)disorder crystal grown by Czochralski method.The crystal with space group Pbnm and lattice parameters of a=0.5185 nm,b=0.5327 nm,c=0.7378 nm,α=β=90°and V=0.203784 nm3 are obtained by fitting powder X-ray diffraction data.The Mohr's hardnesses along three axes are 6.94,7.27,and 7.44.The thermal expansion coefficient of b axis is 4.20×10^(-6)k^(-1)and the density is 5.88 g/cm3.The thermal conductivities are characterized as K_(a)=6.24,K_(b)=5.57,and K_(c)=6.83 W/(m·K).Meanwhile,the refractive index,absorption and emission spectra in triaxial di-rections are determined.Besides,level lifetimes of 4l11/2 and 413/2 are 0.86 and 2.83 ms.Finally,the~2.7μm multiwavelength laser outputs are observed with maximum average power of 628 mW and beam quality factors M_(x)^(2)/M_(y)^(2) of 1.42/1.45.The results prove that the Er:GYAP crystal is a promising gain medium for generating mid-infrared lasers.展开更多
A laser diode end-pumped passively mode-locked Nd：YVO4 solid-state laser with a semiconductor saturable ab- sorber mirror （SESAM）, in which the intracavity laser beam spot on the SESAM can be adjusted periodically,...A laser diode end-pumped passively mode-locked Nd：YVO4 solid-state laser with a semiconductor saturable ab- sorber mirror （SESAM）, in which the intracavity laser beam spot on the SESAM can be adjusted periodically, is investigated. Inserting a rectangular prism （RP） into the laser cavity is a promising approach towards the goal of periodically moving the position of the focus spot of the intracavity pulse on the SESAM surface to avoid the long-time irradiation of the laser beam on the same position, thereby solving a series of problems caused by damage to the SESAM and greatly prolonging its usage life. The adjustment of the rectangular prism in the laser cavity does not break the stable continuous wave （CW） mode-locked condition. The laser generates a stable picosecond pulse sequence at 1064 nm with an output power of 3.6 W and a pulse width of 14 ps. The instabilities of the output power and the pulse width are 1.77% and 4.5%, respectively.展开更多
基金the National Natural Science Foundation of China(52102012)Natural Science Foundation of Anhui Province(2208085QF217)the Fundamental Research Funds for the Central Universities(WK5290000004)。
文摘We demonstrate the growth,thermal,spectroscopy and laser performance of an Er3+doped Gdo.iYo.9AlO3(Er:GYAP)disorder crystal grown by Czochralski method.The crystal with space group Pbnm and lattice parameters of a=0.5185 nm,b=0.5327 nm,c=0.7378 nm,α=β=90°and V=0.203784 nm3 are obtained by fitting powder X-ray diffraction data.The Mohr's hardnesses along three axes are 6.94,7.27,and 7.44.The thermal expansion coefficient of b axis is 4.20×10^(-6)k^(-1)and the density is 5.88 g/cm3.The thermal conductivities are characterized as K_(a)=6.24,K_(b)=5.57,and K_(c)=6.83 W/(m·K).Meanwhile,the refractive index,absorption and emission spectra in triaxial di-rections are determined.Besides,level lifetimes of 4l11/2 and 413/2 are 0.86 and 2.83 ms.Finally,the~2.7μm multiwavelength laser outputs are observed with maximum average power of 628 mW and beam quality factors M_(x)^(2)/M_(y)^(2) of 1.42/1.45.The results prove that the Er:GYAP crystal is a promising gain medium for generating mid-infrared lasers.
基金Project supported by the State Key Laboratory of Tribology,Tsinghua University,China (Grant No.SKLT08A05)
文摘A laser diode end-pumped passively mode-locked Nd：YVO4 solid-state laser with a semiconductor saturable ab- sorber mirror （SESAM）, in which the intracavity laser beam spot on the SESAM can be adjusted periodically, is investigated. Inserting a rectangular prism （RP） into the laser cavity is a promising approach towards the goal of periodically moving the position of the focus spot of the intracavity pulse on the SESAM surface to avoid the long-time irradiation of the laser beam on the same position, thereby solving a series of problems caused by damage to the SESAM and greatly prolonging its usage life. The adjustment of the rectangular prism in the laser cavity does not break the stable continuous wave （CW） mode-locked condition. The laser generates a stable picosecond pulse sequence at 1064 nm with an output power of 3.6 W and a pulse width of 14 ps. The instabilities of the output power and the pulse width are 1.77% and 4.5%, respectively.
