Lasers and Laser Optic|2 Article(s)
Passive Q-switched Cylindrical Vector Beam Fiber Laser Based on Few Mode Fiber
Cheng-xin WANG, Bao-le LU, Min LUO, Hao-wei CHEN, and Jin-tao BAI
A mode converter is prepared through fusion taper coupling a single mode fiber and a few mode fiber, and then a multi-walled carbon nanotube film is used as a saturable absorber to cover the cone of the converter to form a saturable absorber cylindrical vector optical device. Combined the advantages of Q-switched fiber laser and mode conversion device, the pulse cylindrical vector beam can be generated simply and efficiently, and a pulsed high-order mode laser output with high peak power and high mode purity can be obtained. The experiment successfully achieves a stable Q-switched pulse output with a center wavelength of 1 560 nm, a maximum single pulse energy and a maximum peak power of 116 nJ and 57 mW, respectively. The output of the Q-switched laser with radially and azimuthally polarized beams can be achieved by adjusting the polarization controller in the optical path.
Acta Photonica Sinica
  • Publication Date: Mar. 25, 2020
  • Vol. 49 Issue 3 0314003 (2020)
Thermo-optic Effect of Optical Microsphere Cavity for Temperature Sensor Research
Xiao-jun LIN, De-quan LIN, Ting-di LIAO, Ya-fan DUAN, and Yan-tang HUANG
In order to study the thermo-optic effect of the optical microsphere cavity, two kinds of pump sources, 1 550 nm band tunable laser and broadband light source, were used to measure the change of the resonance peak wavelength of silica, tellurite glass microsphere and rare earth ion doped microsphere when the excitation light power and environment temperature change. The excitation power sensitivity of the silica microspheres was 32.4 pm/mW and the temperature sensitivity was 13.4 pm/℃. For the thulium ions doped silica microsphere, the sensitivity of excitation power was 48.7 pm/mw and the sensitivity of the environment temperature was 15.2 pm/℃. The excitation power sensitivity of the tellurite microsphere was 71.1 pm/mw, and the temperature sensitivity was 0.019 1 nm/℃, which was nearly one times higher than that of the FBG temperature sensor (10 pm/℃). If the rare earth ions were doped, the sensitivity was 1.1 times higher. The results have reference significance for the microcavity applications of the temperature sensor.
Acta Photonica Sinica
  • Publication Date: Mar. 25, 2020
  • Vol. 49 Issue 3 0314004 (2020)