Semiconductor research benefits from a new, taccor power laser-based instrument development
A new tabletop instrument that can be easily moved between institutions has been developed by The University of Manchester in collaboration with The University of Cambridge and Laser Quantum. This instrument, used to measure effective mass, sheet carrier concentration and mobility of electrons, will enable researchers to better understand the fundamental structures of materials, leading to significant developments of the next-generation of semiconductors.
The new, innovative instrument replaces the need to visit purpose-built, large facilities such as the national magnet facility in Florida. Instead, a magnetic field is produced in this tabletop instrument, using a recently researched and built, small, high-powered magnet, which creates a 30 Tesla field pulse lasting 14 ms.
The research incorporates Laser Quantum’s taccor power Ti:Sapphire lasers, a hermetically sealed, hands-free femtosecond laser. The two taccor lasers, which have a repetition rate of 1 GHz, around ten times quicker than those found in typical ultrafast systems, are incorporated into the tabletop design and use the technique Asynchronous OPtical Sampling (ASOPS). Here, two lasers are used by fixing the frequency offset between them, in this case at 7 kHz, which provides both the pump and probe pulses for use in the THz spectrometer removing the need for a mechanical-stage delay. The combination of the GHz repetition rate and no physical delay stage allows for significantly faster data acquisition. In this set up for each 14 ms magnetic pulse, an average of 100 measurements were acquired compared to 4 with the previously used set up. The use of ASOPS to investigate particles moving in a magnetic field provides a vast amount of information to the researcher which can then be utilised in the development of the next generation of semiconductor materials all within their own laboratory.
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