Infrared laser photo-acoustic spectroscopy provides very high sensitivity of a gas sample analysis when high-power tunable radiation sources and resonant detectors (PADs) are used. In the PAD, acoustic signal generated by absorbed in measurement chamber is amplified proportionally to Q-factor resonator. But, compact lasers (with power above 100 mW) still not widely spread terahertz spectral ran...

Generating visible light with wide tunability and high coherence based on photonic integrated circuits is of interest for applications in biophotonics, precision metrology quantum technology. Here we present the first demonstration a hybrid-integrated diode laser spectral range. Using an AlGaInP optical amplifier coupled to low-loss Si3N4 feedback circuit microring resonators, obtain coverage 1...