For legal and high-quality downloads, consider these types of platforms:
: High-level academic texts focusing on the quantum mechanics behind laser operation, nonlinear optics, and ultrafast pulses. Where to Find and Download Books
: Often considered the "bible" of laser physics.
: When searching in Russian, use terms like "учебник по лазерам" (laser textbook) or "лазерная техника" (laser technology) alongside "PDF" to find more specific academic results.
: Technical manuals on laser cutting, welding, and 3D printing. These often cover CO2, fiber, and solid-state laser systems used in manufacturing.