Widely tunable eye-safe optical parametric oscillator with noncollinear phase-matching in a ring cavity

A Wavelength-Agile Eye-Safe Optical Parametric Oscillator Based on an X-Cut KTP Crystal

“…4(a), noncollinear PM in the x-z plane of the KTP crystal provided a tuning range from 1572.5 nm to 1697 nm, over 124 nm within an internal noncollinear angle of 3.03° or an external tuning angle of 5.3°. Compared with the method of tuning the signal direction [19], the wavelength range was over 10 nm wider by tuning the pump beam. In addition, such a configuration not only allows strictly constant output direction, but the cavity was greatly simplified and the stability was guaranteed during tuning.…”

“…However, the tuning range of the NCPM KTP OPO is very limited since the collinear phase-matching (PM) condition is sensitive neither to the crystal orientation nor to the working temperature. To overcome this problem, the method of noncollinear PM was proposed in our previous work [19]. With an isosceles-right-triangle three-mirror ring cavity, the oscillating beam direction determined by the cavity could be changed by tilting one of the cavity mirrors, thus the angle between the signal and pump waves are variable which allows a wide tuning range over 100 nm within a noncollinear angle of 3°.…”

Near to Mid-Infrared (1.3–5 μm) Widely Tunable, High Power Picosecond Pulsed Laser

“…A key issue in the design of SPOPOs is the choice of the nonlinear conversion medium. For instance, there are several reports detailing the generation of near-and mid-infrared outputs based on the birefringent-phase-matching (BPM) crystals, including KTiOPO 4 (KTP) [12], KTiOAsO 4 (KTA) [21], and ZnGeP 2 (ZGP) [22]. However, large walk-off effects Appl.…”