The KGd(WO 4) 2[KGW] crystal has a structure belonging to the monoclinic sys tem with space group C 2/ c and with unit cell dimensions a =1.068mm, b =1.043nm, c =0.76nm, β =130°.This crystal is an excellent host...The KGd(WO 4) 2[KGW] crystal has a structure belonging to the monoclinic sys tem with space group C 2/ c and with unit cell dimensions a =1.068mm, b =1.043nm, c =0.76nm, β =130°.This crystal is an excellent host material for solid state lasers.The threshold of the laser oscillations in a Nd 3+ d oped KGW laser crystal is considerable low and has a higher emissive section.T he fluorescent concentration quench effect of the Nd 3+ ion in the KGW crystal may be weakened due to the W O covalent bond,so this crystal has a higher dopi ng concentration of active ion.Furthermore,the absorption band at 808nm of Nd 3+ in the KGW crystal,which has 12nm FWHM,is well matched with the emission w avelength of a laser diode ,a solid state laser pump that is very convenient and popular in laser science and technology today.Therefore the KGW crystal has a l aser emission with higher output and higher efficiency.Scientists of laser techn ology circles are very interested in Yb 3+ doped laser crystals because they have four advanta ges when they are compared with Nd 3+ doped laser crystals.Firstly,their flu orescent lifetimes are three or four times as many as that of Nd 3+ doped la ser crystals,which is beneficial to reserving the energy.Secondly,the heat energ y,which is formed when laser is operating,will be decreased because the pumping band is close to the upper energy level.Not only will the use ratio of energy be increased but also the damage effect to laser properties will be decreased.Thir dly,there is no absorption problems of excite state because the energy level of Yb 3+ is simple.Finally,the higher optical quality crystals are easier to gr ow because the radius of Yb 3+ is closer to that of Gd 3+ .Furthermore,Y b 3+ doped laser crystals can substitute the Ti sapphire for the psec laser .展开更多
Neodymium doped yttrium aluminum borate(NYAB)crystals with sizes up to 45mm have been grown successfully.NYAB rod of φ4×12mm was pumped by xenon flash iamp,and several mJ of 0,53μm green laser output was obtain...Neodymium doped yttrium aluminum borate(NYAB)crystals with sizes up to 45mm have been grown successfully.NYAB rod of φ4×12mm was pumped by xenon flash iamp,and several mJ of 0,53μm green laser output was obtained.The oscillation threshold,the pulse duration,the laser beam polarization,and the laser beam divergence were measured to be 78mJ,100nst 90% and 2mrad,respectively.展开更多
Neodymium Aluminum Borate crystals with dimensions up to 20 × 20 × 45mm^(3) have been grown successfully.Laser rod ofФ3.2m × 23.7mn can be fabricated from the crystal.The relationship between the lumin...Neodymium Aluminum Borate crystals with dimensions up to 20 × 20 × 45mm^(3) have been grown successfully.Laser rod ofФ3.2m × 23.7mn can be fabricated from the crystal.The relationship between the luminescence concentration quenching effect and the structure characteristics of the crystals have been studied.The pulsed laser performance of this crystal at an energy output of 422mJ,is reported.展开更多
文摘The KGd(WO 4) 2[KGW] crystal has a structure belonging to the monoclinic sys tem with space group C 2/ c and with unit cell dimensions a =1.068mm, b =1.043nm, c =0.76nm, β =130°.This crystal is an excellent host material for solid state lasers.The threshold of the laser oscillations in a Nd 3+ d oped KGW laser crystal is considerable low and has a higher emissive section.T he fluorescent concentration quench effect of the Nd 3+ ion in the KGW crystal may be weakened due to the W O covalent bond,so this crystal has a higher dopi ng concentration of active ion.Furthermore,the absorption band at 808nm of Nd 3+ in the KGW crystal,which has 12nm FWHM,is well matched with the emission w avelength of a laser diode ,a solid state laser pump that is very convenient and popular in laser science and technology today.Therefore the KGW crystal has a l aser emission with higher output and higher efficiency.Scientists of laser techn ology circles are very interested in Yb 3+ doped laser crystals because they have four advanta ges when they are compared with Nd 3+ doped laser crystals.Firstly,their flu orescent lifetimes are three or four times as many as that of Nd 3+ doped la ser crystals,which is beneficial to reserving the energy.Secondly,the heat energ y,which is formed when laser is operating,will be decreased because the pumping band is close to the upper energy level.Not only will the use ratio of energy be increased but also the damage effect to laser properties will be decreased.Thir dly,there is no absorption problems of excite state because the energy level of Yb 3+ is simple.Finally,the higher optical quality crystals are easier to gr ow because the radius of Yb 3+ is closer to that of Gd 3+ .Furthermore,Y b 3+ doped laser crystals can substitute the Ti sapphire for the psec laser .
基金supported by National Natural Science Foundation of China.
文摘Neodymium doped yttrium aluminum borate(NYAB)crystals with sizes up to 45mm have been grown successfully.NYAB rod of φ4×12mm was pumped by xenon flash iamp,and several mJ of 0,53μm green laser output was obtained.The oscillation threshold,the pulse duration,the laser beam polarization,and the laser beam divergence were measured to be 78mJ,100nst 90% and 2mrad,respectively.
基金the Science Fund of the Chinese Academy of Sciences.
文摘Neodymium Aluminum Borate crystals with dimensions up to 20 × 20 × 45mm^(3) have been grown successfully.Laser rod ofФ3.2m × 23.7mn can be fabricated from the crystal.The relationship between the luminescence concentration quenching effect and the structure characteristics of the crystals have been studied.The pulsed laser performance of this crystal at an energy output of 422mJ,is reported.
