Multi-peak tunable CW orange laser based on single-pass sum frequency generation in step-chirped MgO: PPLN ![open site](/images/external.gif)
![Multi-peak tunable CW orange laser based on single-pass sum frequency generation in step-chirped MgO: PPLN](https://media.springernature.com/w306/springer-static/cover/journal/11082/50/5.jpg)
We report an all-solid-state tunable CW orange laser based on single-pass sum-frequency generation in step-chirped PPMgO: LN crystal. Two laser sources, a tunable laser (1550 nm) and an ASE laser (1525β1650 nm) are used interchangeably as pumps and mixed with a fixed 975 nm signal laser. Up to 4.3 mW at 597 nm is generated corresponding to 0.87% nonlinear conversion efficiency and the beam quality (M2) value of about 2.5 is measured. The output wavelength can be tuned up toβ~β5.66 nm by varying the position of focusing inside the crystal and by temperature, which makes possible the practical application of our device for wavelength selection and diversity in the orange spectral range.