Extended Data Fig. 2: Transmission measurements.
From: Lithography-free reconfigurable integrated photonic processor
a, Dual-pump optical setup. The 1064 nm pump laser (green trace) is split into two paths for the patterned pumping and the microlaser excitation. The signal around 1500 nm (red trace) is collected by the infrared camera. VA: variable attenuator, OBJ: objective lens, DM: dichroic mirror, PH: pinhole, FM: flip mirror, BPF: band pass filter. b, Target pumping pattern and the pattern generated in experiment. The light spot on the top of the experimental pattern is the zero-order beam from SLM, which does not affect the performance as it is far away from the center. c, Spectrum collected at an input port. d, Spectrum collected at one output port with (red) and without (black) microring lasers excited. e-h Images with different excitation channels. The red and white boxes mark the position of individual microring laser and the output grating. The yellow box indicates the whole imaginary-index-driven area.
