Aiming at the thermal management problem of the gain generator in the chemical laser, a phase-change cooling system for the gain generator has been designed on the premise of keeping the original water-cooling channel unchanged. The phase-change microcapsule suspension with a phase-change temperature 43 ℃ is selected as the cooling medium. The system eliminates the bulky water tank and water pump in the water-cooling system, achieving miniaturization and lightweight of the cooling system for the gain generator of the chemical laser. By comparing the cooling effect of the phase-change microcapsule suspension with that of water-cooling through experimental research, using the stable combustion chamber pressure as the standard for judging the cooling effectiveness, the effect of micro-encapsulated phase-change materials suspension on the cooling of the gain generator in the chemical laser has been investigated. The experimental results have shown that the gain generator cooling system using the phase-change microcapsule suspension with a phase-change temperature of 43 ℃ can effectively cool the kilowatt-level chemical laser.
A method for measuring blood oxygenation and blood flow rate using a single widely tunable semiconductor laser is proposed and investigated. It is shown that a 700-nm-band tunable laser gives the highest sensitivity for blood oxygen measurement. The corresponding tunable laser is designed using the V-coupled cavity structure. The wavelength tuning range can reach 8 nm, which is sufficient for the blood oxygenation measurement in the 700-nm-band by using the Beer- Lambert law. In contrast to conventional blood oxygenation measurement method based on two LEDs, the laser can be used at the same time to measure the blood flow rate based on the Doppler principle.
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