Time-wavelength optical sampling spectroscopy based on dynamic laser cavity tuning

Time-domain terahertz spectroscopy based on asynchronous optical sampling with femtosecond semiconductor disk laser

A terahertz time-domain spectroscopy (THz-TDS) system using an optically pumped semiconductor disk laser and high-speed asynchronous optical sampling is reported. The combination of these techniques holds considerable promise towards a compact and low-cost implementation of THz-TDS. The spectrometer offers a 333 ps time delay window scanned at 10kHz and delivers more than 1.2 THz spectral cover...

Composite Cavity Fiber Laser with Asymmetric Output Intensity and Wavelength

The composite cavity fiber laser (CCFL) is relatively simple in its fabrication, as it is essentially three wavelength matched Bragg gratings in a section of doped fiber. By using internal feedback with unequal sub-cavity lengths, unidirectional CCFLs with significantly asymmetric output power from its two outputs can be achieved. Preliminary results also show that it is possible for the lasing...

Optical cavity enhanced real-time absorption spectroscopy of CO2 using laser amplitude modulation

Wavelength switching in multi-cavity laser diodes

We study experimentally and numerically electrical and optical methods to switch the lasing wavelength in a linear multi-cavity laser. The electrical method uses radio frequency modulation of the gain region to modify effective optical loss at a well-defined wavelength. The optical method uses injection of lasing light to modify effective photon lifetime at the injection wave-length. Short tran...

Cavity Ringdown Laser Spectroscopy (CRDS):

Cavity Ringdown Spectroscopy has become a widely used technique in the optical absorption analysis of atoms, molecules, and optical components. The technique allows the determination of total optical losses within a closed cavity comprised of two or more mirrors, and can be made arbitrarily more sensitive by improvments in the cavity mirror reflectivity. Part of the great attraction that Cavity...