Toptica Photonics' (Munich, Germany) yellow and orange diode lasers are based on frequency-doubled grating stabilization. These DL-SHG (diode laser/second harmonic generator) devices provide output powers from several mW to a few tens of mW, depending on the design wavelength in the range of 555 nm to 625 nm.
They can be coarse-tuned by a few nm and allow for some 10 GHz modehop-free fine-tuning. The proprietary design promises frequency drifts less than 200 MHz/K and coherence lengths of several hundred meters. Main applications of these high-end lasers are spectroscopy and interferometry but also laser cooling or optical pumping of atoms and ions. They are meant to replace expensive dye lasers, offer reliability and economy, and benefit longer "on-time" experiments.
Using frequency-selective feedback, so-called grating-stabilized diode lasers promise high spectral purity and can be tuned in emission wavelength over many nanometers.
Toptica's yellow and orange diode lasers