A microchip-laser-pumped DFB-polymer-dye laser
A microchip-laser-pumped DFB-polymer-dye laser
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DOI：
10.1007/s003400100619
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发表时间：
2001-08
期刊：
影响因子：
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通讯作者：
T. Voss;D. Scheel;W. Schade
中科院分区：
文献类型：
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作者：
T. Voss;D. Scheel;W. Schade
采用Cr ~（4+）：Nd ~（3+）：YAG微片被动调Q倍频激光器（脉宽Δτ=540 ps，重复频率ν=3 kHz，泵浦能量Epump=0.15 μJ）作为泵浦源，报道了一种小型化、高重复频率、皮秒级全固态光致分布反馈（DFB）聚合物染料激光器。以掺杂有罗丹明B染料的聚甲基丙烯酸甲酯薄膜作为活性介质。的DFB激光脉冲的时间和光谱特征，并在高重复频率的薄聚合物/染料膜的稳定性进行了分析。获得的最短DFB激光脉冲的持续时间为11 ps。在发射350000个脉冲之后，DFB激光器输出的强度减小了两倍，脉冲持续时间增加了1.2倍。对于持续时间为20 ps的单DFB激光脉冲，测量到的光谱带宽为Δλ=0.03 nm，其仅比假设脉冲的时间形状为高斯分布的计算的傅立叶极限高0.005 nm。DFB激光器在590和619 nm之间的粗波长调谐通过转动棱镜来完成。此外，通过在20 ° C至40 °C的范围内改变聚合物/染料层的温度（=-0.05nm/°C）来实现DFB聚合物激光器波长的微调。
A miniaturized, high repetition rate, picosecond all solid state photo-induced distributed feedback (DFB) polymer-dye laser is described by applying a passively Q-switched and frequency-doubled Cr4+:Nd3+:YAG-microchip laser (pulse width Δτ=540 ps, repetition rate ν=3 kHz, pump energy Epump=0.15 μJ) as a pump source. A poly-methylmethacrylate film doped with rhodamine B dye serves as active medium. The DFB-laser pulses are temporally and spectrally characterized, and the stability of the thin polymer/dye film at high repetition rates is analyzed. The shortest DFB-laser pulses obtained have a duration of 11 ps. After the emission of 350000 pulses the intensity of the DFB-laser output has decreased by a factor of two and the pulse duration has increased by a factor of 1.2. For single DFB-laser pulses of 20-ps duration the spectral bandwidth is measured to be Δλ=0.03 nm, which is only 0.005 nm above the calculated Fourier limit assuming a Gaussian profile for the temporal shape of the pulses. Coarse wavelength tuning of the DFB laser between 590 and 619 nm is done by turning the prism. Additionally, a fine tuning of the DFB-polymer-laser wavelength is achieved by changing the temperature of the polymer/dye layer ( =-0.05 nm/°C) in the range from 20 to 40 °C.