Design and analysis of monolithic Q-switch Nd3+:YLF waveguide laser using poled-polymer film as guiding layer

Shiro Yamakawa, Takeshi Kinoshita, Keisuke Sasaki, Tetsuo Taniuchi

Research output: Contribution to journalArticlepeer-review


A novel monolithic waveguide laser is proposed in which Q-switch operation is possible by the electro-optic effect with poled-polymer films as the waveguide. The characteristics are numerically obtained. Since Nd3+:YLF crystal with an index of refraction lower than those of other laser crystals is used, it is possible to use a polymer film as the waveguide. Due to the long fluorescent life of Nd3+:YLF, an effective Q-switch operation is possible. In this paper, the optimum waveguide parameters are determined by numerical simulation and the gain and the operating voltage of the electro-optic modulation are computed. The effect of the guided wave loss is taken into account. It is found that laser oscillation is possible with excitation of only several milliwatts even under a relatively large loss of 1 dB/cm. Also, by using the directional coupler configuration using the process capability of the polymer film as the Q-switch electro-optic modulator, a giant pulse with a peak power of 0.46 kW can be obtained with an excitation optical input of 100 mW and an operating voltage of 38.5 V.

Original languageEnglish
Pages (from-to)9-18
Number of pages10
JournalElectronics and Communications in Japan, Part II: Electronics (English translation of Denshi Tsushin Gakkai Ronbunshi)
Issue number2
Publication statusPublished - 1998 Feb


  • Optical integrated circuits
  • Poled-polymer thin film
  • Q-switch laser
  • Waveguide laser
  • YLF

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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