研究目的
Investigating the effects of varying the parameters of Q-switched Nd-YAG laser such as laser power, frequency, and laser pulse repetition on the optical properties of SnO2 thin films deposited by pulsed laser deposition technique.
研究成果
The SnO2 films were grown on glass substrates using pulsed laser deposition. The optical properties were investigated as a function of the laser pulse repetition before and after pumping the argon gas to the vacuum. The absorption decreased with increasing the laser repetition. There was a considerable change at high laser pulse repetition after pumping the argon gas. The absorption coefficient and the extinction coefficient have the same behaviour. Both of them are increased with decreasing the wavelength and decreased with increasing the laser pulse repetition. The behaviour of a and k shows a shift in the absorption edge after pumping the argon gas. Also, the optical energy gap increased after pumping the argon. The refractive index with real and imaginary dielectric constant shows a difference between before and after pumping the argon.
研究不足
The study is limited to the effects of varying the parameters of Q-switched Nd-YAG laser on the optical properties of SnO2 thin films. The influence of other deposition techniques or materials is not considered.
1：Experimental Design and Method Selection:
A Q-switched Nd-YAG laser with 1064 nm and pulse width about 10 ns is used to deposit the SnO2 thin film on a glass substrate. The laser beam is focused onto the SnO2 target surface with a sufficiently high power density and short pulse duration to be able to evaporate and release the material from the target with the same target stoichiometry.
2：Sample Selection and Data Sources:
The tin dioxide powder is grounded and compressed into a round pellet with 1 inch diameter and 3 mm thickness. The optical properties are investigated for tin dioxide thin films which are prepared by pulsed laser deposition.
3：List of Experimental Equipment and Materials:
Q-switched Nd-YAG laser, glass substrate, SnO2 target, argon gas.
4：Experimental Procedures and Operational Workflow:
The experiment is conducted with a laser pulse energy 120 mJ, repetition frequency 6 Hz and pulse duration 10 ns. These parameters are taken with different laser pulse numbers (50, 100, 150, and 200) pulse per seconds. The SnO2 film fabricated at a substrate temperature of 250 °C. The first measurements set are taken under 10-6 mbar vacuum pressure. The measurement is repeated after pumping (50 kg/cm2) argon gas in the vacuum which causes increasing the vacuum pressure from 10-6 mbar without argon gas to 10-3 mbar with argon background.
5：Data Analysis Methods:
The optical properties, such as the absorption coefficient (a), refractive index (n), extinction coefficient (k), and real (er) and imaginary (ei) dielectric constants are calculated within the same wavelength range.
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