[1] [1] J R Petit, J Jouzel, D Raynaud, et al.. Climate and atmospheric history of the past 420,000 years from the Vostok ice core, Antarctica[J]. Nature, 1999, 399(6735): 429-436.

[2] [2] A Fix, C Budenbender, M Wirth, et al.. Optical parametric oscillators and amplifiers for airborne and spaceborne active remote sensing of CO2 and CH4[J]. SPIE, 2011, 8182: 818206.

[3] [3] K Numata, J R Chen, S T Wu, et al.. Frequency stabilization of distributed-feedback laser diodes at 1572 nm for lidar measurements of atmospheric carbon dioxide[J]. Appl Opt, 2011, 50(7): 1047-1056.

[4] [4] J U White. Long optical paths of large aperture[J]. J Opt Soc Am, 1942, 32(5): 285-288.

[5] [5] J Altmann, R Baumgart, C Weitkamp. Two-mirror multipass absorption cell[J]. Appl Opt, 1981, 20(6): 995-999.

[6] [6] P S Light, F Couny, F Benabid. Low optical insertion-loss and vacuum-pressure all-fiber acetylene cell based on hollow-core photonic crystal fiber[J]. Opt Lett, 2006, 31(17): 2538-2540.

[7] [7] P T Marty, J Morel, T Feurer. All-fiber multi-purpose gas cells and their applications in spectroscopy[J]. J Lightwave Technol, 2010, 28(8): 1236-1240.

[8] [8] E D Black. An introduction to Pound-Drever-Hall laser frequency stabilization[J]. Am J Phys, 2001, 69(1): 79-87.

[9] [9] Z Bian, C Huang, D Chen, et al.. Seed laser frequency stabilization for Doppler wind lidar[J]. Chin Opt Lett, 2012, 10(9): 019405.

[10] [10] M Zhou, L Huang, X Xu. Development of a frequency-stabilized 555.8 nm laser[J]. Chin Opt Lett, 2013, 11(12): 121402.

[11] [11] J Henningsen, H Simonsen. The (2201–0000) band of CO2 at 6348 cm-1: linestrengths, broadening parameters, and pressure shifts[J]. J Mol Spectroscopy, 2000, 203(1): 16-27.

[12] [12] P L Varghese, R K Hanson. Collisional narrowing effects on spectral line shapes measured at high resolution[J]. Appl Opt, 1984, 23(14): 2376-2385.

[13] [13] Wang Haibin, Liu Ye, Wang Jinzu, et al.. Preparation of all-fiber low-pressure CO2 gas cell based on hollow-core photonic crystal fiber[J]. Acta Optica Sinica, 2013, 33(7): 0706007.

[14] [14] C M Smith, N Venkataraman, M T Gallagher, et al.. Low-loss hollow-core silica/air photonic bandgap fibre[J]. Nature, 2003, 424(6949): 657-659.

[15] [15] J M Fini, J W Nicholson, R S Windeler, et al.. Low-loss hollow-core fibers with improved single-modedness[J]. Opt Express, 2013, 21(5): 6233-6242.