Laser Standby Control for Wavelength Conversion Protection

The patent implements periodic action by controlling the laser light source to operate in alternating cycles of output status and standby status. During output status, the laser operates at full power to maintain thermal equilibrium and prepare wavelength conversion elements. During standby status, the laser reduces output to prevent damage accumulation. This periodic cycling allows the system to achieve rapid startup without continuous operation, resolving the contradiction between reduced startup time and prevention of element damage.

The patent applies preliminary action by implementing a warm-up period during which optical fiber amplifiers operate at high output status before actual laser operation begins. This preliminary high-power operation pre-heats the amplifiers and stabilizes their temperature and polarization characteristics. By performing this thermal preparation in advance, the system achieves stable conversion efficiency during operation without requiring continuous high-power operation, thus resolving the contradiction between maintaining conversion efficiency and preventing excessive heat generation.

The patent replaces the mechanical shutter system with an optical control method. Instead of using a mechanical shutter to block laser light during standby, the system controls the laser light source itself to reduce or cease output during standby periods. This substitution eliminates the thermal disruption caused by mechanical shutter operation while still protecting wavelength conversion elements from damage. The laser is controlled to operate only when needed, maintaining thermal equilibrium without requiring mechanical intervention, thus resolving the contradiction between element protection and thermal stability.