In this research, numerical simulation and experimental results of thermal stress due to an end-pumped Nd：YVO4 a-cut crystal with 0.5% Nd doping were compared. The findings demonstrate a good consistency with experim...In this research, numerical simulation and experimental results of thermal stress due to an end-pumped Nd：YVO4 a-cut crystal with 0.5% Nd doping were compared. The findings demonstrate a good consistency with experiment. As in this paper has been predicted, at the pumping power above 23 watt, thermal stress has been bigger than thermal facture limit and crystal has broken.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
We demonstrate nonlinear pulse compression of an 8 k Hz Nd:YVO4 picosecond laser using the multi-pass-cell(MPC) technique with fused silica as the nonlinear medium. The pulse duration is compressed from 12.5 ps to 601...We demonstrate nonlinear pulse compression of an 8 k Hz Nd:YVO4 picosecond laser using the multi-pass-cell(MPC) technique with fused silica as the nonlinear medium. The pulse duration is compressed from 12.5 ps to 601 fs, corresponding to a pulse shortening factor of 20.8. The output pulse energy is 154 μJ with an efficiency of 74.5%. To the best of our knowledge,this is the highest pulse compression ratio achieved in a single-stage MPC with bulk material as the nonlinear medium. The laser power stability and the beam quality(M2) before and after the MPC are also experimentally studied. Both the laser power stability and the beam quality are barely deteriorated by the MPC device.展开更多
A diode pumped intracavity frequency-doubled Nd: YVO<sub>4</sub> laser emitting at 671 nm with a type- Ⅱ noncritical phase-matched LBO crystal is reported. A maximum output power at 671 nm of 404 mW was o...A diode pumped intracavity frequency-doubled Nd: YVO<sub>4</sub> laser emitting at 671 nm with a type- Ⅱ noncritical phase-matched LBO crystal is reported. A maximum output power at 671 nm of 404 mW was obtained under an incident pump power of 5.16 W, with an optical-to-optical conversion efficiency up to 7.8%. The output power fluctuates less than 5% while the temperature change of the LBO crystal is maintained at ± 0.5℃ at the phase-matched temperature.展开更多
We demonstrate an all-solid-state continuous-wave(CW)single-frequency tunable 1.08μm laser,which is realized by employing a disordered laser medium Nd:CaYAI0_(4)(Nd:CYA)crystal.The maximal output power of single-freq...We demonstrate an all-solid-state continuous-wave(CW)single-frequency tunable 1.08μm laser,which is realized by employing a disordered laser medium Nd:CaYAI0_(4)(Nd:CYA)crystal.The maximal output power of single-frequency 1.08μm laser is 1 W.By rotating the incident angle of the intracavity etalon(IE),the maximal tuning range of 183.71 GHz is achieved.After the IE is locked to the oscillating longitudinal mode of the laser,the continuous tuning range of 60.72 GHz for 1.08μm laser is achieved by scanning the cavity length.To the best of our knowledge,this is the first demonstration of a CW single-frequency widely tunable 1.08μm laser based on Nd:CYA crystal.展开更多
This paper reports the continuous wave （CW） and Q-switched operation of a diode pumped KGd （WO4）： Nd （Nd：KGW） slab laser with a comer pumped geometry at the wavelength of 1067 nm. With an optical conversion ef...This paper reports the continuous wave （CW） and Q-switched operation of a diode pumped KGd （WO4）： Nd （Nd：KGW） slab laser with a comer pumped geometry at the wavelength of 1067 nm. With an optical conversion efficiency of 38% and 34%, average powers of 23 and 20 W in CW and Q-switched modes were achieved respec- tively. The maximum pulse energy of 27 mJ was observed with a repetition rate of 840 Hz.展开更多
文摘In this research, numerical simulation and experimental results of thermal stress due to an end-pumped Nd：YVO4 a-cut crystal with 0.5% Nd doping were compared. The findings demonstrate a good consistency with experiment. As in this paper has been predicted, at the pumping power above 23 watt, thermal stress has been bigger than thermal facture limit and crystal has broken.
基金National Natural Science Foundation of China(10979029,51172111,11204148)National Engineering Research Center for Optoelectronic Crystalline Materials(2007K08)
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.
基金supported by the Strategic Priority Research Program of CAS (No. XDB16030200)the National Natural Science Foundation of China (Nos. 91850209 and 11774410)the Key-Area Research and Development Program of Guangdong Province (No. 2018B090904003)
文摘We demonstrate nonlinear pulse compression of an 8 k Hz Nd:YVO4 picosecond laser using the multi-pass-cell(MPC) technique with fused silica as the nonlinear medium. The pulse duration is compressed from 12.5 ps to 601 fs, corresponding to a pulse shortening factor of 20.8. The output pulse energy is 154 μJ with an efficiency of 74.5%. To the best of our knowledge,this is the highest pulse compression ratio achieved in a single-stage MPC with bulk material as the nonlinear medium. The laser power stability and the beam quality(M2) before and after the MPC are also experimentally studied. Both the laser power stability and the beam quality are barely deteriorated by the MPC device.
文摘A diode pumped intracavity frequency-doubled Nd: YVO<sub>4</sub> laser emitting at 671 nm with a type- Ⅱ noncritical phase-matched LBO crystal is reported. A maximum output power at 671 nm of 404 mW was obtained under an incident pump power of 5.16 W, with an optical-to-optical conversion efficiency up to 7.8%. The output power fluctuates less than 5% while the temperature change of the LBO crystal is maintained at ± 0.5℃ at the phase-matched temperature.
基金This study was supported by the National Natural Science Foundation of China(Nos.61975100 and 62027821)Program for the Innovative Talents of High Education Institutions of Shanxi,and Fund for Shanxi“1331 Project”Key Subjects Construction。
文摘We demonstrate an all-solid-state continuous-wave(CW)single-frequency tunable 1.08μm laser,which is realized by employing a disordered laser medium Nd:CaYAI0_(4)(Nd:CYA)crystal.The maximal output power of single-frequency 1.08μm laser is 1 W.By rotating the incident angle of the intracavity etalon(IE),the maximal tuning range of 183.71 GHz is achieved.After the IE is locked to the oscillating longitudinal mode of the laser,the continuous tuning range of 60.72 GHz for 1.08μm laser is achieved by scanning the cavity length.To the best of our knowledge,this is the first demonstration of a CW single-frequency widely tunable 1.08μm laser based on Nd:CYA crystal.
文摘This paper reports the continuous wave （CW） and Q-switched operation of a diode pumped KGd （WO4）： Nd （Nd：KGW） slab laser with a comer pumped geometry at the wavelength of 1067 nm. With an optical conversion efficiency of 38% and 34%, average powers of 23 and 20 W in CW and Q-switched modes were achieved respec- tively. The maximum pulse energy of 27 mJ was observed with a repetition rate of 840 Hz.
