Fig. 1. Doppler wind lidar system based on MZI

Fig. 2. Principle diagram of quadrichannel MZI

Fig. 3. Transmission of quadrichannel MZI

Fig. 4. Interference contrast of MZI versus laser linewidth

Fig. 5. Wind detection error versus interference contrast in dual-channel MZI

Fig. 6. Schematic of ‘cat’s eye’ optical system

Fig. 7. Schematic of light’s oblique incidence to parabolic mirror in ‘cat’s eye’ optical system

Fig. 8. ROP(φ)-ROP0 versus x0, p, y0, and φ. (a) φ=5 mrad, p=200 mm, y0=20 mm; (b) φ=5 mrad, x0=200 mm, y0=20 mm; (c) φ=5 mrad, x0=200 mm, p=200 mm; (d) x0=200 mm, y0=20 mm, p=200 mm

Fig. 9. Constructed large field of view MZI with large optical-path difference

Fig. 10. Transmission spectra of field-widened quadrichannel MZI

Fig. 11. Transmission spectra of dual-channel MZI before and after field-widening

Fig. 12. Backscattering coefficient profiles of aerosols and atmospheric molecules