Abstract
We have demonstrated sum-frequency generation of a compact continuous-wave orange laser in a step-chirped magnesium oxide doped periodically poled lithium niobate in single-pass mode. A 974 nm laser diode was mixed with a C-band amplified spontaneous emission laser source to yield a triple-wavelength operation at 594.9, 596.9, and 598.6 nm with a maximum output power of 9.3 mW and broad bandwidth of ~4.4 nm. The triple-wavelength output power stability was ~2.5% in 30 min. This technique provides a path to generate broadband laser sources at shorter wavelengths which are potentially useful for biomedical and spectroscopic applications.
Highlights
Continuous-wave (CW) lasers in the visible wavelength have drawn increased interest over the past decades for applications in fundamental research, industry, and light displays
Orange lasers with wavelengths close to 600 nm assume a critical part in a plethora of present-day applications, for example, photodynamic treatment [1], flow cytometry [2], spectroscopy [3], astronomy [4], optogenetics and neuroscience [5], and laser projection shows [6]
A dual-wavelength operation was achieved at 594.9 and 598.6 nm (Figure 2b) by setting the temperature difference to ∆T = 7.1 ◦ C (T1 ~41.2 ◦ C, T2 ~34.1 ◦ C). This could be attributed to the longitudinal temperature change induced on the crystal that causes a variation of phase matching along the crystal, which either enhances or lowers the phase mismatching
Summary
Continuous-wave (CW) lasers in the visible wavelength have drawn increased interest over the past decades for applications in fundamental research, industry, and light displays. A widely-tunable source within the 770 nm wavelength region has been implemented based on chirped periodically poled lithium niobate with a phase matching bandwidth as extensive as 50 nm [23] This advancement has prompted the use of a single crystal for the generation of several wavelengths in the visible range that are very reasonable for entertainment applications. To control the local heating of distinctive areas, two temperature-controlled thermoelectric ovens were utilized, controlling the fundamental wavelength acceptance bandwidth which adds a unique advantage of continuous reconfigurability and adjustable abilities to the step-chirped QPM structure This technique has the potential to expand the existing capabilities of step-chirped structures and is expected to broaden the wavelength coverage of solid-state lasers in the visible spectrum. Up to 9.3 mW CW triple-wavelength output power was realized corresponding to ~20.3%/W normalized conversion efficiency
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