Portable double-sided pulsed laser heating system for time-resolved geoscience and materials science applications

Area of Science:

• Geophysics and planetary science
• Materials science
• Spectroscopy

Background:

• Diamond anvil cells (DACs) are crucial for simulating extreme pressures and temperatures.
• Accurate in situ temperature measurements are vital for understanding material behavior under these conditions.
• Pulsed laser heating offers rapid heating capabilities but requires precise control and diagnostics.

Purpose of the Study:

• To develop a portable, double-sided pulsed laser heating system for diamond anvil cells.
• To enable stable, high-repetition rate pulsed laser heating.
• To implement in situ, time-resolved, and space-resolved temperature determination.

Main Methods:

• Developed a portable double-sided pulsed laser heating system for DACs.
• Achieved stable laser pulses (microseconds) with high repetition frequencies (up to 100 kHz).
• Utilized Planck radiation function fitting (650-850 nm) for temperature determination.
• Employed a gated detector for time-resolved measurements and multi-point collection for spatial resolution.

Main Results:

• Demonstrated stable pulsed laser heating with microsecond pulse durations and 100 kHz repetition rates.
• Successfully implemented in situ temperature determination via thermal radiation spectrum analysis.
• Achieved time-resolved and space-resolved temperature measurements.
• Showcased system compatibility with synchrotron facilities for advanced experiments.

Conclusions:

• The developed pulsed laser heating system provides a versatile and accurate tool for high-pressure, high-temperature research.
• The system's capabilities are particularly beneficial for synchrotron-based experiments like nuclear resonance spectroscopy.
• Applications include studying the behavior of materials such as iron oxides under extreme conditions.