Font Size: a A A

Study On Intracavity Quasi-Continuous Pumped MgO:APLN Mid-infrared Multi-optical Parametric Oscillator

Posted on:2022-06-03Degree:MasterType:Thesis
Country:ChinaCandidate:X C WangFull Text:PDF
GTID:2518306545486574Subject:Physics
Abstract/Summary:PDF Full Text Request
Lasers with wavelengths in the range of 3-5 ?m have very important research values,such as military countermeasures,lidar,spectral analysis,and laser communications.In recent years,mid-infrared dual-wavelength lasers have attracted widespread attention in the field of laser technology research.The multi-quasi-phase-matched optical parametric oscillator(MOPO,Multi Optical Parametric Oscillator)is an effective way to realize the synchronization and tunable multi-wavelength laser of the same spectral region.It not only extends the spectral coverage of the multi-wavelength laser,but also broadens the optical parametric oscillator.The scope of application.In this thesis,an experimental study of intracavity quasi-continuous pumping MOPO is carried out,and its contents are summarized as follows:Theoretically analyzed the working principle of multiple quasi-phase matching technology and optical parametric oscillation technology,and designed the non-periodic polarization structure of MgO:APLN crystal,forming two reciprocal lattice vectors in a single crystal,realizing 1.57?m,3.3?m and the output of two pairs of parametric light of1.47?m and 3.84?m.A pulse-pump mode multi-optical parametric oscillation energy conversion model was established,and the five-wave conversion relationship of the multi-optical parametric oscillation cavity was clarified.Combining the ABCD matrix to simulate the distribution of the fundamental frequency light spot and the parametric light spot,the matching mode of the fundamental frequency light spot and the parametric light spot is optimized,and the optimal value range of important parameters such as the curvature of the cavity mirror and the cavity size is selected.The parametric light output process of pulse-pumped MOPO is simulated.By selecting the repetition frequency and signal light transmittance,the gain competition and inverse conversion problems in the MOPO cavity can be suppressed and adjusted,and the best parameters for the experimental setup are determined.The construction of the platform provides theoretical support.In terms of experiment,based on theoretical simulation,a high repetition frequency1064 nm fundamental frequency light experiment was carried out.At a repetition frequency of 40 k Hz,when the 808 nm pump light power is 43.84 W,the highest 1064 nm fundamental frequency light output is 20.11 W,the pulse width is 19.73 ns,and the conversion efficiency is 45.87%.Subsequently,an intracavity quasi-continuous pumping MgO:APLN multi-optical parametric oscillator experiment was built.By selecting the transmittance of the signal light and optimizing the re-frequency,the occurrence of the inverse conversion phenomenon was controlled.Finally,the maximum output power of 3.3?m is 1.42 W,the maximum output power of 3.84?m is 2.46 W,the pulse width is 11.33 ns and 13.17 ns,respectively,and the mixed output power of 3.3?m and 3.84?m is 3.86 W.At this time,the conversion efficiency of pump light and 3.3?m parametric light is 3.23%,the conversion efficiency of pump light and 3.84?m parametric light is 5.61%,and the conversion efficiency of pump light and 3.3?m and 3.84?m mixed parametric light is 8.80%.The experimental results are basically consistent with the theoretical simulations.
Keywords/Search Tags:3.3/3.8?m dual-wavelength mid-infrared laser, MgO:APLN, Multi Optical Parametric Oscillator, Cavity quasi-continuous pumping
PDF Full Text Request
Related items