Passively Q-Switched Nd,Cr:YAG Laser Simultaneous Dual-Wavelength Operation at 946 nm and 1.3μm

A diode-end-pumped Q-switched high-efficiency Nd, Cr：YAG laser with simultaneous dual-wavelength emission at 946nm and 1.3μm is demonstrated. The maximum output power of 1.93 W with simultaneous dual-wavelength operation is achieved at an absorbed pump power of 13.32 W and an absorbed slope efficiency of 15.15%. The maximum optical-optical efficiency is 14.49% with pulse widths of 16.38ns at 946nm and 26.65ns at 1.3μm. A maximum total repetition rate of 43.25 kHz is obtained.

High-Power Passively Q-Switched Nd:YAG Laser at 1112 nm with a Cr^(4+):YAG Saturable Absorber

A high-power passively Q-switched Nd：YAG laser operating at lll2nm with Cr4＋：yAO as a saturable absorber is demonstrated. Under 808 nm diode-direct pumping, the maximum average output power of 2.73 W is achieved at the pump power of 16.65 W, corresponding to an optical-to-optical conversion efficiency of 16.4%. At the same time, the pulse width, pulse repetition rate, single pulse energy and peak power are 27.2ns, 9 kHz, 303.3#3 and 11.2kW, respectively. As far as we know, the result gives the highest average output power at 1112nm generated by an 808 nm diode-end-pumped Nd：YAG laser.

Efficient Diode-Pumped Actively Q-Switched Ceramic Nd:YAG/YVO4 Raman Laser Operating at 1657 nm

A diode-pumped actively Q-switched Raman laser is demonstrated, with YV04 employed as Raman active medium, based on a ceramic Nd：YAG laser operating at 1444nm. The first-stokes Raman generation at 1657nm is achieved. A maximum output power of as high as 612mW is obtained under a pump power of 20. 7 W and at a pulse repetition frequency rate of 20kHz, corresponding to an optical-to-optical conversion efficiency of 3%.

595nm脉冲染料激光与1064nm长脉宽Nd-YAG激光治疗鲜红斑痣疗效对比

目的回顾性分析比较595 nm脉冲染料激光及1 064 nm长脉宽Nd-YAG激光治疗鲜红斑痣的疗效及不良反应。方法应用595 nm脉冲染料激光(能量为8~15 J/cm^2,脉宽为1.5~10 ms)及1 064 nm Nd-YAG激光(能量密度为120~130 J/cm^2,脉宽25~45 ms)共治疗鲜红斑痣1 150例,从年龄、性别、皮损类型、不同治疗次数及不良反应等方面比较2种激光的疗效。结果 595 nm激光与1 064 nm Nd-YAG激光治疗鲜红斑痣有总效率分别为70.33%、76.99%,差异有统计学意义(χ~2=6.58,P<0.05);尤其是增厚型皮损,有效率分别为23.08%、58.47%,差异有统计学意义(χ~2=23.84,P<0.01);瘢痕发生率分别为0.37%、3.48%,差异有统计学意义(χ~2=14.16,P<0.01)。结论 595 nm脉冲染料激光及1 064 nm Nd-YAG激光治疗鲜红斑痣均安全有效,后者疗效略高于前者,但瘢痕发生率也略高。

595 nm脉冲染料激光联合长脉冲Nd∶YAG 1064 nm激光治疗增生性瘢痕

目的 探讨595 nm脉冲染料激光联合长脉冲Nd∶YAG1064 nm激光治疗增生性瘢痕的疗效.方法 将162例增生性瘢痕患者随机分为3组,其中A组52例,采用595 nm脉冲染料激光治疗;B组57例,采用长脉冲Nd∶YAG 1064 nm激光治疗;C组53例,采用595 nm脉冲染料激光联合长脉冲Nd∶YAG1064 nm激光治疗.治疗参数：595 nm脉冲染料激光脉宽为1.50 ms,光斑为7、10 mm,能量密度为7～11 J/cm2;长脉冲Nd∶YAG 1064 nm激光脉宽为15.00 ms,光斑直径为6mm,能量密度为60～80 J/cm2.每次治疗间隔4周,连续4次.根据温哥华瘢痕量表评价治疗后的瘢痕色泽、厚度、血管分布、柔软度、治愈率和有效率.结果 4次治疗后,C组每次治疗瘢痕评分明显低于A组和B组,差异有统计学意义（P＜0.05）.A组治疗后每次的治愈率分别为7.7％、25.0％、38.5％、67.3％,有效率分别为51.9％、67.3％、82.7％、96.2％;B组治疗后每次的治愈率分别为10.5％、22.8％、36.8％、66.7％,有效率分别为47.4％、64.9％、86.0％、93.0％;A组和B组比较,治愈率、有效率差异无统计学意义（P＞0.05）.C组治疗后每次的治愈率分别为20.8％、32.1％、69.8％、94.3％,有效率分别为71.7％、94.3％、100％、100％,C组与A、B组比较,治愈率和有效率差异均有统计学意义（P＜0.05）.结论 595 nm脉冲染料激光联合长脉冲Nd∶YAG 1064 nm激光治疗增生性瘢痕治疗次数较少、效果较好,可推广应用.