Advanced Ti:Er:LiNbO3 waveguide lasers

摘要

This paper reviews the latest developments of diode-pumpednTi,Er:LiNbO3 waveguide lasers emitting at wavelengths aroundn1.5 Μm. In particular, harmonically mode-locked lasers, Q-switchednlasers, distributed Bragg reflector (DBR)-lasers, and self-frequencyndoubling lasers are discussed in detail. Supermode stabilizednmode-locked lasers have been realized using a coupled cavity concept; anside mode suppression ratio of 55 dB has been achieved at 10-GHz pulsenrepetition rate with almost transform limited pulses. Q-switched lasersnwith a high extinction ratio (>25 dB) intracavity electrooptic switchnemitted pulses with a peak power level up to 2.5 kW and a pulsewidthndown to 2.1 ns at 1-kHz repetition frequency. Numerical simulations fornboth lasers are in a good, almost quantitative agreement withnexperimental results. A DBR-laser of narrow linewidth (≈3 GHz) with anpermanent (fixed) photorefractive grating and 5 mW output power has beennrealized. Self frequency doubling lasers have been fabricated with anperiodic microdomain structure inside an Er-doped laser cavity;nsimultaneous emission at the fundamental wavelength, 1531 nm, and at thensecond harmonic wavelength, 765 nm, has been obtained