Wavelength swept Ti:sapphire laser

Doppler calibration method for Spectral Domain OCT spectrometers

“…Efficient Fast Fourier Transform (FFT) algorithms require the spectral interferogram to be evenly spaced in the k-domain. In general, this is not the case (although exceptions are possible [6,7]). Consequently, calibration of the spectrometer/swept source is required, in order to re-sample the data prior to FFT.…”

Wavelength-swept Yb-fiber master-oscillator-power-amplifier with 70nm rapid tuning range

“…The 20nm/ms rate at which this occurred was consistent across various sweepfrequency / tuning range combinations while strong spiking only occurred on the decreasing wavelength sweep. These observations lead us to attribute the spiking onset to residual wavelength-dependent variations in the intracavity losses driving the relaxation frequency of the laser as the wavelength was swept, and the directional dependence to the interaction of the sweep rate with the AOTF-induced round-trip frequency shift as described by Kodach et al [12]. While scan rates above 20nm/ms were not investigated in this work, AOTF-based active suppression of relaxation oscillations would offer a clear route to higher tuning rates [13].…”

Swept-wavelength mid-infrared fiber laser for real-time ammonia gas sensing

“…For example, in the near-IR region, semiconductor-based swept sources have been demonstrated with MHz sweep rates, permitted by the sub-nanosecond gain dynamics of semiconductor materials [20]. Solid-state gain materials such as Ti:sapphire and rare-earthdoped fiber have longer lifetimes on µs-ms time scales, however, typically leading to reduced tuning ranges and strong intensity noise from relaxation oscillations when swept faster than 100s Hz [20,36].…”