This paper reviews the authors' experimental works on realizing a Peta-Hz tunable range ( from UV to IR ) highly coherent optical frequency sweep generator by using semiconductor lasers, nonlinear optical crystals, and the technique of optical phase locking. Experiments on generations of second harmonics, sum/difference-frequencies, proposal and experiments on a highly accurate optical frequency chain, and the performance of a wide-span optical frequency comb generator are described. Especially for the optical frequency comb generator, a 4 Tera-Hz frequency span of the modulation sidebands is realized.
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