Nd:YAG infrared laser as a viable alternative to excimer laser: YBCO case study

Area of Science:

• Materials Science
• Condensed Matter Physics
• Thin Film Deposition

Background:

• Pulsed Laser Deposition (PLD) is a key technique for fabricating complex oxide thin films.
• Excimer lasers are commonly used in PLD but have safety and handling concerns.
• Developing alternative laser sources for PLD is crucial for advancing thin film technology.

Purpose of the Study:

• To investigate the growth of epitaxial Yttrium Barium Copper Oxide (YBCO) thin films using a first harmonic Nd:YAG laser source.
• To characterize the superconducting properties of the fabricated YBCO thin films.
• To evaluate the Nd:YAG laser as a viable alternative to excimer lasers for PLD.

Main Methods:

• Epitaxial YBCO thin films and heterostructures were grown exclusively by Pulsed Laser Deposition (PLD).
• A first harmonic Nd:YAG pulsed laser source (1064 nm) was employed for deposition.
• Growth conditions, including target-to-substrate distance, were optimized.
• Superconducting transition temperatures were measured.

Main Results:

• High-quality epitaxial YBCO thin films were successfully grown.
• The films exhibited superconducting properties with a transition temperature around 80 K.
• Optimal growth conditions were achieved at a larger target-to-substrate distance compared to excimer lasers.
• The Nd:YAG laser proved effective for depositing complex multi-element compounds.

Conclusions:

• The first harmonic Nd:YAG laser is a promising alternative to excimer lasers for PLD.
• This method offers advantages in terms of compactness and safety.
• The technique facilitates the deposition of high-quality superconducting YBCO thin films.
• This breakthrough advances the field of complex oxide thin film deposition.