MONOPULSE Nd:YAG LASER AND LASER SYSTEM FOR MARINE AND OCEAN RADIOMETRIC LIDARS

Abstract

A monopulse Nd:YAG laser and laser system based on master laser – power amplifier architecture are proposed and investigated. The intracavity optical parametric oscillator (OPO) based on KTP crystal (θ = 90°, φ = 0°) provides the generation of signal wave radiation at λ_s = 1572 nm and shortening the duration of monopulses of pump wave radiation at λ_p = 1064 nm. An increase in the energy of the monopulse radiation with λ_s occurs in parametric amplifier in KTP crystal (θ = 90°, φ = 0°). In laser system proposed, an increase in the energy of the monopulses of radiation from λ_p occurs in the Nd:YAG amplifier, which ensures effective generation of the first sum frequency λ_Σ1 = 635 nm (λ_Σ1^–1 = λ_p^–1+λ_s^–1) in the KTP crystal (θ = 54°, φ = 0°) and generation of the second sum frequency λ_Σ2 = 452 nm (λ_Σ2^–1 = λ_Σ1^–1+λ_s^–1) in the KTP crystal (θ = 67°, φ = 0°). Second harmonic radiation at λ_p/2 = 532 nm is generated in KTP crystal (θ = 90°, φ = 23°). The results obtained can be used to create lasers and laser systems for marine and oceanic radiometric lidars with increased depth resolution.