Fast swept continuous wave quantum cascade laser operating in external cavity with polygon mirror

Fast swept continuous wave quantum cascade laser operating in external cavity with polygon mirror
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快扫连续波量子级联激光器在带有多面镜的外腔中工作

DOI:
10.1117/12.2620957
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发表时间:
2022
期刊:
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影响因子:
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通讯作者:
Revin D
Revin D
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作者:
Revin D

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我们报道了一个连续波室温量子级联激光器,它工作在Littrow结构的外腔中,带有一个旋转速度为24,000 RPM的10面多角镜。量子级联激光发射在小于~45 µs的时间内扫过1520 - 1625 cm-1波数范围,扫描重复率为4 kHz。在激光增益最大值、15°C和0.86 A驱动电流下测得的最大输出功率约为90 mW;在45 µs波数扫描范围内估计的平均输出功率约为50 mW。通过其扫描,激光器在激光器芯片腔的连续法布里-珀罗纵模上发射,模式分离为~0.5 cm-1。发射模式的线宽小于~0.15 cm-1。对空气中10微米厚的苯乙酮和水蒸气层的红外吸收特征进行光谱测量,证明了在不到45 μs的时间内获得光谱数据的能力。
We report a continuous wave room temperature quantum cascade laser operating in an external cavity in the Littrow configuration with a 10-facet polygon mirror rotating at 24,000 RPM. The quantum cascade laser emission is swept across ∼1520 – 1625 cm-1 wavenumber range in less than ~45 µs with a sweep repetition rate of 4 kHz. The measured maximum output power at the laser gain maximum, 15°C and 0.86 A driving current is ~90 mW; the estimated average output power across the 45 µs wavenumber sweep is ~50 mW. Through its sweep, the laser emits on the sequential Fabry-Perot longitudinal modes of the laser chip cavity with the mode separation of ~0.5 cm-1 . The linewidth of the emitting modes is less than ~0.15 cm-1 . Spectral measurements of the infrared absorption features of a 10 µm thick layer of acetophenone and water vapor in the air have demonstrated the capability of obtaining spectral data in less than 45 μs.
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