Title:
LIGHT EMISSION DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/045453
Kind Code:
A1
Abstract:
The present embodiment pertains to a light emission device with which it is possible to remove zero-order light from the output light of an S-iPM laser. The light emission device comprises an active layer and a phase modulation layer. A phase modulation layer includes a basic layer and a plurality of different refractive index regions. In a state in which an imaginary square lattice is set on the phase modulation layer, the center of gravity of each of the different refractive index regions is set away from the corresponding lattice point, and the angle of rotation around each lattice point determining the position of the center of gravity of each of the different refractive index regions is determined according to the phase distribution for optical image formation. The lattice spacing and the light emission wavelength satisfy the criteria for M point oscillation in a reciprocal lattice space of the phase modulation layer. The size of at least one of the in-plane wave vectors in four directions, which are formed in the reciprocal lattice space and each of which includes a wave number spread corresponding to the angular spread of output light, is less than 2π/λ.
Inventors:
HIROSE KAZUYOSHI (JP)
TAKIGUCHI YUU (JP)
SUGIYAMA TAKAHIRO (JP)
KUROSAKA YOSHITAKA (JP)
TAKIGUCHI YUU (JP)
SUGIYAMA TAKAHIRO (JP)
KUROSAKA YOSHITAKA (JP)
Application Number:
PCT/JP2019/033568
Publication Date:
March 05, 2020
Filing Date:
August 27, 2019
Export Citation:
Assignee:
HAMAMATSU PHOTONICS KK (JP)
International Classes:
H01S5/185
Foreign References:
| JP2018026463A | 2018-02-15 | |||
| JP2014197665A | 2014-10-16 | |||
| JP2014236127A | 2014-12-15 | |||
| JP2008098379A | 2008-04-24 | |||
| US20110044365A1 | 2011-02-24 |
Other References:
LIANG ET AL.: "Three-dimensional coupled-wave analysis for triangular-lattice photonic-crystal surface-emitting lasers with transverse-electric polarization", OPTICS EXPRESS, vol. 21, no. 1, 7 January 2013 (2013-01-07), pages 565 - 580, XP055696733
KUROSAKA ET AL.: "Effects of non-lasing band in two-dimensional photonic-crystal lasers clarified using omnidirectional band structure", OPTICS EXPRESS, vol. 20, no. 19, September 2012 (2012-09-01), pages 21773 - 21783, XP055219395, DOI: 10.1364/OE.20.021773
KUROSAKA ET AL.: "Phase-modulating lasers toward on-chip integration", SCIENTIFIC REPORTS, vol. 6, 26 July 2016 (2016-07-26), pages 30138, XP055550784
SAKAI ET AL.: "Coupled-Wave Theory for Square- Lattice Photonic Crystal Lasers With TE Polarization", IEEE JOURNAL OF QUANTUM ELECTRONICS, vol. 46, no. 5, May 2010 (2010-05-01), pages 788 - 795, XP011290200, DOI: 10.1109/JQE.2009.2037597
KUROSAKA ET AL.: "Effects of non-lasing band in two-dimensional photonic-crystal lasers clarified using omnidirectional band structure", OPTICS EXPRESS, vol. 20, no. 19, September 2012 (2012-09-01), pages 21773 - 21783, XP055219395, DOI: 10.1364/OE.20.021773
KUROSAKA ET AL.: "Phase-modulating lasers toward on-chip integration", SCIENTIFIC REPORTS, vol. 6, 26 July 2016 (2016-07-26), pages 30138, XP055550784
SAKAI ET AL.: "Coupled-Wave Theory for Square- Lattice Photonic Crystal Lasers With TE Polarization", IEEE JOURNAL OF QUANTUM ELECTRONICS, vol. 46, no. 5, May 2010 (2010-05-01), pages 788 - 795, XP011290200, DOI: 10.1109/JQE.2009.2037597
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
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