Figure 2From: Analog electro-optical readout of SiPMs for compact, low power ToF PET/MRI Characterization of the HFE4192-58X VCSEL. Its current rises exponentially with voltage (left). After the laser threshold current is surpassed, it's optical power (middle) and output noise levels (right) rise linearly with current. To optimize SNR a laser bias just above the VCSEL's threshold (1.7mA) was chosen.Back to article page