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Express"],"published-print":{"date-parts":[[2026,1,12]]},"abstract":"<jats:p>We report the fabrication and characterization of a monolithic waveguide-based frequency-converted laser source. An Nd:YAG laser crystal and a periodically poled lithium niobate frequency-doubling chip were permanently bonded on a common fused-silica substrate via ultrafast laser microwelding. A continuous double-track waveguide was then fabricated across the two dissimilar crystals using ultrafast laser inscription to form an integrated, alignment-free frequency-converted laser source. The integrated source was diode-pumped at 808\u2005nm, resulting in lasing at 1064\u2005nm and subsequent second-harmonic generation (SHG) at 532\u2005nm. SHG tuning behavior for different track separations revealed trade-offs between confinement, efficiency, and mode structure. 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