240-GHz continuously frequency-tuneable Nd:YVO_4/LBO laser with two intra-cavity locked etalons

Abstract

This work reports for the first time on study of a single-frequency Nd:YVO4 laser with intra-cavity frequency doubling, in which quasi-continuous frequency tuning over an ultra-broad range is implemented with two intra-cavity locked etalons and automatic stitching between ranges of smooth scanning of the laser's output frequency. The proposed and demonstrated method allowed to continuously tune the output frequency of the studied 1.5-W Nd:YVO4/LBO laser over a record-breaking broad range of 240 GHz at 532 nm.

Continuously tunable CW single-frequency Nd:YAP/LBO laser with dual-wavelength output

“…By modifying the incidental angle of the etalon, the laser frequency could be coarsely tuned. To implement the continuous frequency tuning and enforce the long-term stable SLM operation of the laser, the transmission peak of the etalon had to be locked to the oscillating laser mode [17][18][19] . For this purpose, an etalon locking system located in the servo controller (SC) was adopted in the laser system, as shown in Fig.…”

A tunable single-frequency green laser based on a wedged Nd:YVO4 crystal and a KTP crystal

“…For precise interferometry applications, a precise wavelength control of the single frequency laser is needed, so tuning of the laser wavelength is also a desirable feature. The well-known tunable single frequency 532 nm laser is achieved with a unidirectional ring laser [1,2] or by inserting an etalon [3,4] in a standing-wave cavity. A unidirectional ring laser requires many components in the resonator, and an etalon is also needed for linewidth compression and wavelength tuning.…”