In this contribution we will report on the realization of a single frequency, high-power 2.0 μm VECSEL laser for a specific quantum frequency conversion process and the development of the locking scheme using an optical frequency comb for the wavelength stabilization. We were able to reach a single frequency output power of 2.3 W in CW-operation at 2062 nm with a long-time absolute wavelength stability in the MHz range.
Recent progress will be reviewed on high-power, single-frequency GaSb-based VECSEL, covering the 2.0 – 2.4 μm wavelength range. Up to 2.8 W of continuous-wave, single-frequency output power was reached at 18°C heatsink temperature and 2.23 µm emission wavelength. We will discuss the tuning capabilities of different setups and means for absolute wavelength stabilization.
We employ thickness gauging with a fast terahertz time-domain spectroscopy (TDS) system based on electronically controlled optical sampling (ECOPS) and compare the results with those of a benchmark conventional terahertz TDS system and a mechanical micrometer gauge. The results of all technologies are in good agreement. We show that the ECOPS system is suitable for fast inline thickness measurements, owing to high measurement rate of 1600 traces per second. Moreover, we characterize the system with respect to signal quality. The time-domain dynamic range is ~60 dB for a single-shot measurement, and ~90 dB with 1000 trace averages, which are completed within less than a second (i.e., 0.625 seconds). The time-domain signal-to-noise ratio amounts to ~50 dB and ~80 dB for 1 and 1000 averages, respectively.
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