Pulse duration retrieval using a commercial laser diode with a monitor photodiode
Abstract
Semiconductor lasers merge coherent light emission with photodetection and, owing to third-order nonlinearities in their active region, function as sensitive room-temperature two-photon absorption detectors. Here, we leverage these capabilities offered by a commercially available InGaAsP semiconductor laser diode with an integrated InGaAs monitor photodiode to measure the duration of femtosecond pulses at telecom wavelengths. The nonlinear and linear signals obtained from both detectors enable the retrieval of pulse duration with femtosecond accuracy without moving parts. This capability is demonstrated down to 2 µW average optical power for a 250 MHz repetition rate laser.
Fields of Study & Subjects
Laser-Matter Interactions and Applications
Semiconductor Lasers and Optical Devices
Advanced Fiber Laser Technologies
Publication details
- Journal / source
- Optics Express
- Volume
- 34
- Issue
- 4
- Pages
- 6968–6968
- Publication date
- 16 January 2026
- Language
- EN