Core Viewpoint - The article discusses the classification and application of various laser technologies in the medical aesthetics industry, emphasizing that different laser types serve distinct treatment paths and are complementary in a mature medical aesthetic center [19]. Group 1: Laser Types and Mechanisms - Q-switched lasers utilize nanosecond energy pulses to break down melanin particles, effective for treating pigmentation issues like freckles and tattoos [3]. - Picosecond lasers further shorten pulse width to picoseconds, allowing for deeper penetration and collagen activation, suitable for conditions like melasma and acne scars [4][5]. - CO₂ fractional lasers operate at a wavelength of 10600 nm, vaporizing water in the skin to treat deeper skin issues and induce collagen regeneration, making them ideal for significant skin reconstruction [6][8]. - Er:YAG lasers, with a wavelength of 2940 nm, focus on superficial skin layers, providing precise exfoliation with minimal thermal damage, suitable for fine lines and superficial scars [9][12]. Group 2: Applications and Benefits - Q-switched lasers are foundational tools for pigment-related treatments due to their powerful pigment destruction capabilities [3]. - Picosecond lasers are versatile, often used in fractional mode for acne scars and skin texture improvement [5]. - CO₂ lasers have a longer recovery period but offer unique advantages in structural skin repair [8]. - Er:YAG lasers are preferred for patients seeking minimal downtime and precise treatment of superficial skin issues [12][14]. Group 3: Market Overview - As of June 2025, 77 laser-related medical aesthetic devices have been approved for market use in China, indicating a growing industry with diverse technological offerings [16][17].