Abstract
We demonstrate a compact blue and orange-two color continuous wave laser source emitting at 487 nm and from 597.4 to 600.3 nm, respectively. The temperature tunable coherent orange radiation is achieved by frequency mixing 974 nm laser diode (LD) and a C-band amplified spontaneous emission laser source while the temperature insensitive blue radiation is generated by second-order quasi-phase-matching frequency doubling of 974 nm LD. We implement the simultaneous nonlinear processes in a single magnesium oxide doped periodically poled lithium niobate bulk crystal without the need of an aperiodic design.
Highlights
Visible lasers have become ubiquitous in our society for numerous applications ranging from scientific research to industry and entertainment
The theoretical sum frequency output power can be estimated using the relation PSFG = 32π 2 d2e f f P1 P2 L/nSFG ε 0 λ2SFG c(n1 λ1 + n2 λ2 ) [23], and the corresponding conversion efficiency can be given as η = PSFG /P1 P2, where c is the speed of light in vacuum, ε 0 is the permittivity in vacuum, and de f f = 2d33 /π is the effective nonlinear coefficient of MgO:PPLN. nSHG, nSFG, n1, and n2 are refractive indices at λSHG, λSFG, λ1, and λ2, respectively, while ω f (~43 μm) is the confocal beam waist
We have demonstrated an approach to generate a dual-wavelength laser source based on single-pass second harmonic and sum frequency generation in a magnesium oxide doped, periodically poled lithium niobate crystal
Summary
Visible lasers have become ubiquitous in our society for numerous applications ranging from scientific research to industry and entertainment. Orange lasers with wavelengths near 600 nm play a key role in biomedical applications [2], and laser projection displays [3] Nonlinear conversion processes such as second harmonic generation (SHG) and sum frequency generation (SFG) are efficient approaches for realizing such visible light sources with periodically poled ferroelectric crystals. Various techniques to generate red (R), green (G), blue (B), and even yellow (Y) colors have been previously reported These techniques include utilizing several crystals each for different nonlinear process [10], self-frequency doubling and self-frequency mixing in Nd3+ -doped bulk aperiodically poled lithium niobate [11,12], and cascaded nonlinear interactions in aperiodically poled lithium tantalate (LT) [13,14] or stoichiometric LT [15,16]. We report the coincidental single-pass SFG and SHG phase-matching for the simultaneous generation of CW blue and orange light in a single magnesium oxide doped periodically poled lithium niobate (MgO:PPLN) crystal. Our device has the potential as two technologically interesting laser sources in MgO:PPLN in a simple and practical manner without the need for an aperiodic design
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