Fig. 1. MGY laser. (a) Structural diagram of laser diode; (b) tuning principle

Fig. 2. Structural diagram of wavelength scanning and calibration system

Fig. 3. Tuning characteristics at left and right reflection regions. (a) Heat map of current-wavelength; (b) heat map of current-R_SMSR

Fig. 4. Scanning results at phase region under different wavelengths. (a) 1540 nm; (b) 1560 nm

Fig. 5. Flow of wavelength calibration

Fig. 6. Wavelength tuning performance at normal temperature. (a) Scanning curves; (b) bias curve

Fig. 7. Internal structure of MGY laser after package

Fig. 8. Normalized transmittance of F-P etalon

Fig. 9. Set wavelength-output wavelength of laser

Fig. 10. Absorption spectrum of C₂H₂ gas

Fig. 11. High precision and accuracy wavelength tuning system

Fig. 12. Absorption spectra of C₂H₂ gas

Fig. 13. Experimental results of wavelength tuning. (a) Bias between scanning and standard curves; (b) precision and correctness curves