Abstract:The fact that some crystalline substances can generate the second harmonic (SH) – light of twice the frequency – under intense irradiation was discovered soon after lasers were available. Later, it was realized that some biological polymers were also able to generate the SH, offering a label‐free way of imaging cell components in the microscope. To obtain sufficiently intense light without damaging the sample, pulsed lasers are needed, typically delivering 100 fs pulses at ∼10 ns intervals. The signal is only … Show more
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