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首页> 美国政府科技报告 >Waveguide Experiments in PbTe Thin Films and the Tuning Character of PbTe Diode Lasers.
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Waveguide Experiments in PbTe Thin Films and the Tuning Character of PbTe Diode Lasers.

机译：pbTe薄膜中的波导实验及pbTe二极管激光器的调谐特性。

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Grating couplers have been fabricated in thin-film PbTe waveguides on BaF2substrates. The grating spacings are between 1.8and 2.1micrometers,which is the appropriate range for coupling into the low order modes of a high index film (n = 5-6) with a 10.6micrometer CO2laser. The gratings are first formed in a photoresist layer on the film using holographic or mask exposure. The pattern is then transferred to the PbTe by etching in a dilute bromic acid and bromine solution. The last step is essential for obtaining high coupling efficiencies. Due to the high index of the film,efficient coupling cannot be achieved with a low index photoresist layer alone. Coupling efficiencies are estimated to be approximately 10%. Tuning characteristics of a number of PbTe thin-film lasers are measured. Tuning rates are typically 1.5-0.15GHz/mA depending on diode resistance and thermal impedance. The maximum tuning range observed in a single mode was 70GHz. (Author)

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