All-solid-state diode-pumped modelocked Cr:LiSAF laser

A diode-pumped Cr:LiSrAlF/sub 6/ laser has been modelocked for the first time using a multiquantum well absorber in an external cavity to yield CW trains of picosecond pulses.<>     

Development of a diode-pumped Kerr-lens mode-locked Cr:LiSAF laser

Kerr-lens mode-locked Cr:LiSrAlF/sub 6/ lasers are demonstrated with various prism pairs based on a recalculation of the condition for compensating the intracavity dispersion. The minimum pulse duration is 9.9 fs, which is the limit for ordinary nonchirped dielectric mirrors. To develop an efficient diode-pumped Kerr-lens mode-locked Cr:LiSAF laser, diode-pumping geometry is also discussed.     

Theoretical and experimental investigations of small-signal gainfor a diode-pumped Q-switched Cr:LiSAF laser

We present a theoretical model proving that up-conversion and thermal quenching of fluorescence strongly limit small-signal gain in a CW pumped Cr:LiSAF laser. We have a good agreement with experimental measurements of small-signal gain obtained with a new simple method. We have then optimized the gain in a Cr:LiSAF laser pumped by two 400-mW red diodes. The highest gain, 1.11 at 600 mW of absorbed pump power, is obtained if the pump spot is circularized inside the crystal and if the Cr:LiSAF is pumped on both sides. In Q-switched operation, this laser produces tunable pulses (up to 6.5 μJ at 10 kHz) between 800 and 900 nm     

Cr:LiSAF slab laser performance

The performance of a flash-lamp pumped Cr³⁺: LiSrAlF ₆ multi-bounce slab laser is reported. The slab was conductively-cooled by a sapphire window which also transmitted the pump light. Laser output of 9 mJ and a slope efficiency of 0.061% were obtained although less than 15% of the total pump aperture was used     

Multi-terawatt femtosecond Cr:LiSAF laser

We discuss the design of a Cr:LiSAF laser system capable of generating ultrashort, 90-fs Fourier-transform limited pulses with a peak power of 8 TW. Using chirped pulse amplification and flashlamp-pumped Cr:LiSAF amplifiers this system incorporates a regenerative amplifier and three additional double-pass amplifiers with increasing aperture up to 25 mm. The temporal performance as well as the spatial beam quality are discussed in detail. We discuss extension of this system to the Petawatt power level     

可调谐连续波Cr：LiSAF激光器的研究

报道了连续波运转的Ｃｒ：ＬｉＳＡＦ激光器。该器件采用氩离子激光器的４８８ｎｍ谱线泵浦Φ６ｍｍ×２０ｍｍ的Ｃｒ：ＬｉＳＡＦ晶体，在吸收泵浦功率为９００ｍＷ时，得到５０ｍＷ的连续波输出。当在腔内放置色散元件后，其调谐范围是８２０ｎｍ到８６５ｎｍ。     

Flashlamp-pumped Cr:LiSAF laser amplifier

A flashlamp-pumped Cr:LiSAF laser amplifier has been developed that is capable of producing ultrashort pulses with a peak power of ~TW. A systematic experimental study of laser oscillation, its small-signal gain, and chirped-pulse amplification has been performed under the same pumping conditions. The characteristic properties and performance of the Cr:LiSAF laser amplifier are reported     

掺铬六氟铝酸锶锂可调谐激光器的进展

Cr:LiSAF是一种高效率、宽发射光谱及寿命时间长的激光晶体。Cr:LiSAF激光器发展极快,现已提供从可见到近红外区域全固体化宽带可调谐激光及超短脉冲激光。     

7.3--Five-kilohertz repetition-rate pulsed YAG:Nd laser

The design of a five-kilohertz repetition-rate pulsed YAG:Nd laser of one watt average output power is described. Four problem areas are considered: the relation between material properties and performance, optical pumps, resonators, and cooling.     

半导体激光泵浦的Cr:LiSAF可调谐激光器

报道了激光二极管脉冲泵浦掺铬六氟铝酸锶锂（ＣｒＬｉＳＡＦ）可调谐激光器的实验结果。调谐范围为８０６．６～９２０ｎｍ。最大平均输出功率超过２ｍＷ，斜率效率为２５％。对实验结果进行了讨论。     

Solid-state repetition-rate tunable semiconductor colliding-pulse mode-locked laser

A monolithic mode-locked semiconductor laser with the capability of tuning its repetition rate while passively mode-locked through solid-state means is reported. Over 200 MHz of tuning is demonstrated with variations in the applied dc bias. Dynamic tuning is demonstrated by applying an ac signal to one section showing a tuning bandwidth over a hundred megahertz. Pulse parameters and timing jitter are also presented for passive and hybrid mode-locking operation.     

全固态Cr:LiSAF/LBO腔内倍频蓝光激光器

本文报道了利用最大输出功率为650mW的全固态Nd:YVO4/LB0671nm红光激光器作为泵浦源,纵向泵浦Cr:LiSAF,利用LBO腔内倍频,获得430nm的连续蓝光输出的实验研究,并解释了当泵浦功率继续增大时,输出功率下降的原因。在泵浦功率为560mW时,获得了最大输出功率为9mW的430nm蓝光输出,激光的阈值为230mW。     

Broadband diode-pumped fibre laser

Reports the observation of a strong dependence of the emission spectrum (centre wavelength and linewidth) of Nd:silica fibre lasers on pump wavelength. In a particular fibre, careful selection of the pump wavelength has led to the operation of a broadband fibre laser at 1060 nm with 19 nm FWHM bandwidth. When pumped with a 30 mW diode laser, it exhibits a 1 mW threshold, a 2.5 mW output, and an intrinsic average wavelength temperature stability of about 10 p.p.m./°C     

115-W Tm:YAG diode-pumped solid-state laser

A compact diode-pumped Tm:YAG laser capable of generating greater than 100 W of CW power at 2 μm has been demonstrated. A scalable diode end-pumping architecture is used in which 805-nm radiation, coupled to the wing of the Tm³⁺³H₆-³H ₄ absorption feature, is delivered to the end of the laser rod via a lens duct. To facilitate thermal management, undoped YAG end caps are diffusion bonded to the central doped portion of the laser rod. For 2% and 4% Tm-doped rods of the same length, the lower doping level results in higher power, indicating that cross relaxation is still efficient while offering lower thermal stress and reduced absorption at the laser wavelength. Output powers for various output coupler reflectivities are compared to the predictions of a quasi-three-level model. Thermal lensing, cavity stability, and stress-induced birefringence measurements are described. The beam quality was analyzed with the 2% Tm-doped rod and a flat output coupler, yielding M² values of 14-23     

10 kHz-linewidth diode-pumped Er:Yb:glass laser

A single-mode Er:Yb:phosphate glass laser pumped at 980 nm by an InGaAs diode laser is reported. The laser emits over 15 mW output power with 6% slope efficiency. The measured linewidth is 10.6 kHz and the RIN power is less than 140 dB/Hz.<>     

Laser diode-pumped internally folded Nd:YAG laser

A diode-pumped Nd:YAG laser in which the gain element is fabricated in the shape of an isosceles right-angle prism is described. An orthogonal face forms the highly reflective end of the resonator, while the hypotenuse serves as an internal fold mirror. Scaling was demonstrated by pumping the gain element along three axes simultaneously. The maximum power obtained was 1.3 W at 1.06 μm and 128 mW at 532 nm. Repetitive Q-switched operation is also reported     

掺铬氟化锂锶铝激光器小信号增益的研究

在考虑掺铬氟化锂锶铝晶体的激发态吸收和上转换的情况下,求出掺铬氟化锂锶铝激光器小信号增益随泵浦功率的变化,分析晶体温度对小信号增益的影响。在实验上研究连续掺铬氟化锂锶铝激光器输出功率与泵浦功率的关系,发现转换效率随着泵浦功率的增加而下降。     

LD泵浦再生放大器技术研究

再生放大器作为一种具有极高增益的前置放大器,在获取窄脉宽、高峰值功率激光过程中具有重要作用。本文对再生放大器的传统光路进行了改进,通过光路设计与精确时间控制,将脉冲单选功能集成到再生放大过程中,进行了腔内单选再生放大器技术研究,实验证明这种改进是完全可行的。     

单管LD泵浦的高效紧凑连续绿光激光器

结合Nd：YVO4的偏振吸收和LD（激光二极管）的偏振性,设计了高效的自聚焦透镜耦合系统、利用激光晶体和倍频晶体构成激光谐振腔、KTP晶体的II类相位匹配,计算并分析了在存在热透镜情况下平-平固体激光腔的特性,研制出高效紧凑结构的全固态绿光激光器。激光器利用TEC精确控制激光晶体和KTP晶体的温度,当泵浦功率为4.8 W时,532nm输出功率为1.4 W,光-光转换效率达到30%,24小时不稳定性±2%。     

Power scaling of a flashlamp-pumped Cr:LiSAF thin-slab zig-zag laser

We report on the power scaling of a flashlamp-pumped Cr:LiSrAlF/sub 6/ thin-slab zig-zag laser operating at repetition rates up to 5 Hz. Average output power of 44 W with pulse energies of 8.8 J was achieved operating with a stable cavity. Excellent medium control was also obtained during this operation. Also demonstrated at 5 Hz was operation at energies /spl sim/ 0.5 J in Q-switched mode with unstable optics and bandwidth control, beam quality < 1.5 XDL, bandwidth /spl sim/ 1 GHz, and root-mean-square beam jitter of less than half of a diffraction limited far-field spot radius.