Abstract
We report simultaneous dual wavelength continuous laser emission with minimum cavity elements. Tunable dual wavelength emission between 805 nm and 840 nm was observed with controlled peak separation around two nanometers, which corresponds to approximately one terahertz. Dual wavelength laser operation is possible using a novel intracavity two plate birefringent filtering element.
Highlights
Laser source emission is determined by the gain medium and resonator characteristics in which single or multiple wavelengths have been obtained
Either laser has been used in optical coherence tomography (OCT) [1, 2], optical shop testing [3], commercial fiber communication systems [4], atom interferometry [5], spectroscopy and even to detect parasites in water [7]
In this paper we present a tunable continuous wave (CW) dual wavelength configuration with minimum cavity elements realized on a Ti:Sapphire crystal (Ti):Sapphire laser
Summary
Laser source emission is determined by the gain medium and resonator characteristics in which single or multiple wavelengths have been obtained. Multiple wavelengths can produce wavelength beating and extends the capabilities of a laser source by multiple wavelength engineered emission in which the minimum independent obtainable wavelengths are two. Double wavelength emission has been obtained using diode lasers, fiber lasers and dye lasers [9]–[14]. Sources with emission in two wavelengths using titanium sapphire lasers have been explored using coupled cavities, double-prism dispersion cavities, acousto-optic tunable filters, and with two independent seed injection lasers [15]–[22]. The use of a birefringent filter (BRF) element for dual wavelength (DW) pulsed operation with peak separation larger than 100 nm has been reported [23]. In this paper we present a tunable continuous wave (CW) dual wavelength configuration with minimum cavity elements realized on a Ti:Sapphire laser. The peak separation observed is close to two nanometers, corresponding approximately to one terahertz in separation between the two emission peaks
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