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(a) Spectra for 680 nm, 795 nm, and 850 nm VCSELs. In each case, measurements were taken at threshold current (black), peak power (red), and current sweep operation (SW) through a range optimized for each device. (b) Interferogram envelopes for three wavelengths in SW operation, showing similar coherence lengths in each case. (c) Speckle contrast for 680 nm VCSEL near threshold, showing high contrast dropping off as power is increased
