帮忙翻译一下，要人工翻译的

The semiconductor diode laser (LD) is a practical most important kind of laser. Its volume is small, the life is long, and may use the simple injection current the way to come the pump. Its working voltage and the electric current and the integrated circuit are compatible, thus may with it monolithic integration. And may also use to reach as high as GHz the frequency to carry on the electric current modulation to obtain the high speed modulation directly the laser output. As a result of these merits, the semiconductor diode laser in the laser communication, the light saved, aspects and so on light top, laser printing, range finder as well as radar as well as has obtained the widespread application.

Key words: Semiconductor laser, threshold current, voltage-current characteristic, laser spectrum, spectroscope

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