Lasers can also have substantial temporal coherence, which permits them to emit light with an extremely slender frequency spectrum. Temporal coherence will also be used to supply ultrashort pulses of sunshine that has a wide spectrum but durations as small as an attosecond.[seven] ช่วยปรับสีผิวให้มีความสม่ำเสมอกันทั่วทั้งใบหน้า This process is known as spontaneous https://michelangelos630eil2.therainblog.com/profile