Ultrafast laser-written dual-wavelength waveguide laser

We report the performance of a dual-wavelength waveguide laser based on a phase-modulated sampled-grating architecture fabricated using the femtosecond laser direct-write technique. The waveguide laser was written in Yb-doped phosphate glass and had a narrow linewidth (<10 pm), high signal-to-noise ratio (>60 dB), 5 mW output power per channel, and wavelength separation of 10 nm.     

二极管激光器泵浦钕玻璃固体激光器

用脉冲输出功率50mW,中心波长为800nm的双异质结激光二极管列阵泵浦磷酸盐钕璃璃激光器,得到1.053μm波长激光输出.泵浦阈值功率为9mW.计算了DPL输出的尖峰功率、脉冲宽度和弛豫振荡波形,与实验结果一致.     

Single-pass waveguide amplifiers in Er-Yb doped zinc polyphosphate glass fabricated with femtosecond laser pulses

We have investigated the direct fabrication of subsurface waveguide amplifiers in Er-Yb zinc polyphosphate glass by utilizing the relationship between the initial glass composition and the resulting changes to the network structure after modification by fs laser pulses. Waveguides, exhibiting internal gain of 1 dB/cm at 1.53 μm when pumped with 500 mW at 976 nm, were directly fabricated using a regenerative amplified Ti:sapphire 1 kHz, 180 fs laser system. Optical properties as well as insertion losses and internal gain are reported.     

铒镱共掺光波导激光器的稳态特性

从光波导激光器的工作理论出发,研究了铒镱共掺磷酸盐波导激光器的稳态特性。利用重叠因子简化了980 nm光抽运的铒镱共掺波导激光器四能级模型的速率-传输方程;在忽略自发辐射的情况下,利用数值模拟的方法,得到了铒镱共掺波导激光器的输出与Er³⁺/Yb³⁺离子浓度、泵浦功率、波导长度等参量之间的关系曲线。理论分析结果表明,选择合适的铒镱离子浓度是制作铒镱共掺波导激光器的关键。采用980 nm波长的泵浦光,泵浦功率为80 mW,Er³⁺浓度取20×10²⁶/m³左右,Yb³⁺/Er³⁺浓度比为7~10,波导长度为20 cm左右时,可以得到最大输出光功率。     

Tapered waveguide semiconductor raman laser

Semiconductor Raman laser can act as a heterodyne demodulator of terahertz-band modulated light wave signals in wideband optical communication systems. We have been developing the semiconductor Raman laser with a waveguide structure composed of a GaP core and Al_xGa_1–xP cladding layers. The tapered waveguide structure can reduce the threshold pump power by increasing the internal pump power density. Fabricated tapered waveguide semiconductor Raman laser have shown the threshold pump power of 160 mW. Discussion is made on the origin of losses as well as the limit of the low pump power operation.     

Single-frequency Ti:Er:LiNbO3 distributed Bragg reflector waveguide laser with thermally fixed photorefractive cavity

The first single-frequency Ti:Er:LiNbO₃ distributed Bragg reflector waveguide laser with two thermally fixed photorefractive gratings as resonator mirrors is reported. The optically pumped (λ_p=1480 nm,120-mW incident power) laser emits up to 1.1 mW at λ_s=1561.1 nm. The threshold pump power is 70 mW. Received: 7 June 2001 / Published online: 30 October 2001     

Crystalline Pr:SrAl12O19 waveguide laser in the visible spectral region

We fabricated waveguides in Pr:SrAl(12)O(19) crystals by direct femtosecond laser writing. The propagation losses were calculated to be as low as 0.16 dB/cm at a wavelength of 633 nm. Laser oscillation in a diode-pumped waveguide at a wavelength of 643.5 nm was realized. The output power of the waveguide laser was 28.1 mW at a slope efficiency of 8%.     

Proton beam writing of Nd:GGG crystals as new waveguide laser sources

Focused proton beam writing has been utilized to fabricate optical channel waveguides in Nd:GGG crystals. The 1?MeV proton beam irradiation creates a local modified region with positive refractive index changes at the end of the proton trajectory, in which the channel waveguide could confine the light field in a symmetric way. Room-temperature laser emission has been achieved at 1063.7?nm, with absorbed pump power of 61?mW (at 808?nm). The obtained slope efficiency of the Nd:GGG waveguide laser system is as high as 66%, which is, to our best knowledge, the highest value for integrated lasers from ion beam processed channel waveguide systems.     

Development and characterization of Yb-Er laser glass for high average power laser diode pumping

A new strong erbium laser glass (SELG) based on a boro-alumo-phosphate composition is reported. We discuss the synthesis and chemical properties together with spectroscopic and thermo-mechanical data. The new glass composition shows excellent laser performance and withstands high-average power pump radiation. We present laser results at 1.54 μm from flashlamp and laser pumping. In tests with laser-diode pumped Q-switched Er-Yb microchip lasers, we have achieved up to 150 mW of average output power and generated 1.2 kW in peak power. Co²⁺:MgAl₂O₄ was here used as the saturable absorber. Received: 21 December 2001 / Revised version: 14 April 2002 / Published online: 8 August 2002     

Swift heavy-ion irradiated active waveguides in Nd:YAG crystals: fabrication and laser generation

An Nd:YAG planar waveguide laser has been fabricated by ultra-low-fluence (2×10(12) cm(-2)) swift heavy-ion irradiation (60 MeV Ar(4+) ions). The appearance of the buried waveguiding has been associated with an increased refractive index layer as a consequence of the ion-induced electronic damage. Continuous-wave laser oscillations at 1064.2 nm have been observed from the waveguide under 808 nm optical excitation, with the absorbed pump power at threshold and laser slope efficiency close to 26 mW and 5.9%, respectively.     

Thulium channel waveguide laser in a monoclinic double tungstate with 70% slope efficiency

Laser experiments were performed on buried, ridge-type channel waveguides in an 8 at.?% thulium-doped, yttrium-gadolinium-lutetium codoped monoclinic double tungstate. A maximum slope efficiency of 70% and output powers up to 300 mW about 2.0 μm were obtained in a mirrorless laser resonator, by pumping with a Ti:sapphire laser near 800 nm. To the best of our knowledge, this result represents the most efficient 2 μm channel waveguide laser to date. Lasing is obtained at various wavelengths between 1810 nm and 2037 nm.     

利用51微米激光器测量中红外光波导损耗(英文)

一种新型的采用AlGaAs材料设计制成的光波导显示了其在中红外激光器方面的应用。波导部分包含在两个GaAs的包层之间,两个包层的掺杂材料限制光场在波导中传播并且降低损耗。三个不同长度的波导经过切入式测量得到它们的内部传播损耗为1 5dB/cm和耦合损耗为9dB。所采用的中红外激光器的波长是5 1μm,输出功率在45毫瓦以上。从光波导输出的光功率只有几个毫瓦。     

大功率1060nm双沟脊波导分布反馈激光器

研制了双沟型脊波导结构的1 060 nm分布反馈激光器.和普通脊波导激光器相比,该器件能提高在连续条件下的侧模稳定性.单模最大输出功率达到300 mW边模抑制比大于45 dB.采用该激光器进行泵浦周期性极化铌酸锂晶体倍频实验,得到的绿光功率为3 mW,该方案将成为低成本绿光光源实现方案.     

Monochromatization of semiconductor laser diodes using one-dimensional photonic crystals

The results on the development of the single-frequency semiconductor laser with external cavity based on a fiber Bragg grating (one-dimensional photonic crystal) formed in a single-mode fiber waveguide are presented. Stable single-frequency lasing at a wavelength of 977 nm with a spectral half width of 0.2 nm is achieved with a laser power output of 350 mW. The temperature dependence of lasing parameters is studied.     

Fifty percent internal slope efficiency femtosecond direct-written Tm³⁺:ZBLAN waveguide laser

We report a 790 nm pumped, Tm3? doped ZBLAN glass buried waveguide laser that produces 47 mW at 1880 nm, with a 50% internal slope efficiency and an M2 of 1.7. The waveguide cladding is defined by two overlapping rings created by femtosecond direct-writing of the glass, which results in the formation of a tubular depressed-index-cladding structure, and the laser resonator is defined by external dielectric mirrors. This is, to the best of our knowledge, the most efficient laser created in a glass host via femtosecond waveguide writing.     

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对影响长腔HCN激光器功率输出的各种参数进行了调试实验,实验结果表明,激光器的最佳参数为：栅网250目/英寸、工作波导管壁温130°C、混合气体流量21.3sccm、激光工作电流1.3A、工作气体压力147Pa、补充He气流量12sccm。在最佳工作参数条件下,长腔HCN激光器的激光输出为210mW。     

Diode-pumped Yb:Sr(3)Y(BO(3))(3) femtosecond laser

We have developed a diode-pumped Yb(3+)Sr(3)Y(BO(3))(3) (Yb:BOYS) laser generating 69-fs pulses, at a central wavelength of 1062 nm. This laser is mode locked by use of a semiconductor saturable-absorber mirror and emits 80 mW of average power at 113 MHz. This is, to our knowledge, the first mode-locked Yb:BOYS laser and the shortest duration obtained from an ytterbium laser with a crystalline host. The central wavelength can be tuned from 1051 to 1070 nm, for sub-100-fs pulses. We have also achieved an average power as high as 300 mW with pulse duration of 86 fs at 1068 nm.     

250 mW, 1.5 microm monolithic passively mode-locked slab-coupled optical waveguide laser

We report the demonstration of a 1.5 microm InGaAsP mode-locked slab-coupled optical waveguide laser (SCOWL) producing 10 ps pulses with energies of 58 pJ and average output powers of 250 mW at a repetition rate of 4.29 GHz. To the best of our knowledge, this is the first passively mode-locked slab-coupled optical waveguide laser. The large mode and low confinement factor of the SCOWL architecture allows the realization of monolithic mode-locked lasers with high output power and pulse energy. The laser output is nearly diffraction limited with M2 values less than 1.2 in both directions.