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Proceedings Paper

780nm-range VCSEL array for laser printer system and other applications at Ricoh
Author(s): Naoto Jikutani; Akihiro Itoh; Kazuhiro Harasaka; Toshihide Sasaki; Shunichi Sato
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Paper Abstract

A 780 nm-range 40 channels vertical-cavity surface-emitting laser (VCSEL) array was developed as a writing light source for printers. A 15° off missoriented GaAs substrate, an aluminum-free GaInAsP/GaInP compressively-strained multiple quantum well and an anisotropic-shape transverse-mode filter were employed to control polarization characteristics. The anisotropic-shape transverse-mode filter also suppressed higher transverse-mode and enabled high-power single-mode operation. Thus, orthogonal-polarization suppression-ratio (OPSR) of over 22 dB and side-mode suppression-ratio (SMSR) of 30 dB were obtained at operation power of 3mW at same time for wide oxide-aperture range below 50 μm2. Moreover, a thermal resistance was reduced for 38% by increasing a thickness of high thermal conductivity layer (3λ/4-AlAs layer) near a cavity. By this structure, a peak-power increased to 1.3 times. Moreover, a power-fall caused by self-heating at pulse-rise was decreased to 10% and the one caused by a thermal-crosstalk between channels was decreased to 46%. The VCSEL array was mounted in a ceramic package with a tilted seal glass to prevent optical-crosstalk caused by other channels. Thus, we achieved stable-output and high-quality beam characteristics for long-duration pulse drive.

Paper Details

Date Published: 4 March 2016
PDF: 10 pages
Proc. SPIE 9766, Vertical-Cavity Surface-Emitting Lasers XX, 976605 (4 March 2016); doi: 10.1117/12.2219764
Show Author Affiliations
Naoto Jikutani, Ricoh Co., Ltd. (Japan)
Akihiro Itoh, Ricoh Co., Ltd. (Japan)
Kazuhiro Harasaka, Ricoh Co., Ltd. (Japan)
Toshihide Sasaki, Ricoh Co., Ltd. (Japan)
Shunichi Sato, Ricoh Co., Ltd. (Japan)


Published in SPIE Proceedings Vol. 9766:
Vertical-Cavity Surface-Emitting Lasers XX
Kent D. Choquette; James K. Guenter, Editor(s)

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