论文部分内容阅读
锁模(mode-locking)技术是1964年发展起来的。利用这种技术,尤其是对撞锁模CPM(colliding-pulse mode-locking)可以产生皮秒(10~(-12)s)甚至飞秒(10~(-15)s)量级的超短脉冲,这对于物理化学以及分子弛豫过程的超高速现象的研究具有决定性的意义。随着半导体技术在光纤通讯、电光采样、时钟信号等光电子学领域的飞速发展,迫切需要一种宽度窄、频率高的半导体激光脉冲光源。为此投入了大量的研究。常用的半导体超短光脉冲技术包括Q开关、增益开关、锁模技术等。无论在理论上还是实践上,脉宽最窄和重复频率最高的脉冲,都是由锁模技术得到的。1990年,Chen等人首次报道了利用微波调制的对撞锁模技术,在单片集成InGaAsP量子阱激光器上得到脉宽1.4ps,重复频率32.5GHz的超短脉冲。本文报道了利用对称三段式结构的InGaAsP量子阱激光器,在无调制情况下获得脉宽5.0ps,重复频率38.5GHz的超短光脉冲。
Mode-locking technology was developed in 1964. The use of this technique, especially the colliding-pulse mode-locking (CPM), can produce very short (10- (-12) s) or even femtosecond (10-15 Pulse, which is of decisive significance for the study of the ultra-high-speed phenomena in the physicochemical and molecular relaxation processes. With the rapid development of semiconductor technology in optoelectronics such as optical fiber communication, electro-optical sampling and clock signal, a narrow width and high frequency semiconductor laser pulsed light source is urgently needed. To this end put a lot of research. Commonly used semiconductor ultra-short optical pulse technology, including Q switch, gain switch, clamping technology. Whether in theory or in practice, the most narrow pulse width and repetition rate of the pulse, are obtained by the mode-locking technique. In 1990, Chen et al. First reported the collision-mode-locking technique using microwave modulation to obtain an ultra-short pulse with a pulse width of 1.4 ps and a repetition frequency of 32.5 GHz on a monolithically integrated InGaAsP quantum well laser. In this paper, an ultrashort optical pulse with a pulse width of 5.0 ps and a repetition frequency of 38.5 GHz is obtained without modulation using an InGaAsP quantum well laser with a symmetrical three-segment structure.