MIR photothermal QPI of microbeads
This protocol is extracted from research article:
Adaptive dynamic range shift (ADRIFT) quantitative phase imaging
Light Sci Appl, Jan 1, 2021; DOI: 10.1038/s41377-020-00435-z

MIR pulses with a duration of 5 μs lasing at 1045 cm−1 provided by a quantum cascade laser (QD9500CM1, Thorlabs) are used as the pump light. A ZnSe lens (LA7733-G, Thorlabs) with a focal length of 20 mm is used to loosely focus the MIR light onto the sample with an excitation-field diameter of ~75 μm. The MIR ON-OFF modulation rate is 5 Hz. The MIR pulse energy at the sample plane is ~50 nJ. The diameter of the DF mask is 100 μm.

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