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External Resonator Type Light Emitting System

A technology of external resonators and light-emitting devices, which is applied to the structure of optical resonant cavities, instruments, optics, etc., and can solve problems such as changes in light intensity

Active Publication Date: 2014-12-24
NGK INSULATORS LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this FP-type laser oscillates at a wavelength at which the standing wave condition is established, so the longitudinal mode tends to become multimode, and in particular, when the current or temperature changes, the oscillation wavelength changes, thereby changing the light intensity.

Method used

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  • External Resonator Type Light Emitting System
  • External Resonator Type Light Emitting System
  • External Resonator Type Light Emitting System

Examples

Experimental program
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Embodiment

[0137] (Example)

[0138] made as Figure 1-Figure 3 device shown.

[0139] Specifically, a film of Ni is formed on a substrate in which MgO-doped lithium niobate crystals are cut into z-plates, and a grating pattern is fabricated in the y-axis direction by photolithography. Thereafter, reactive ion etching is performed through the mask Ni pattern, thereby forming a pitch (pitch) interval Λ of 180 nm and a length L b 100μm grating groove. The groove depth of the grating is 300nm. In addition, in order to form an optical waveguide propagating in the y-axis, the grating portion was subjected to groove processing with a width Wm of 3 μm and a Tr of 0.5 μm using an excimer laser. Further, on the trench formation surface, the SiO 2 The buffer layer 17 formed was formed at a thickness of 0.5 μm, and a black LN substrate was used as a support substrate, and the grating formation surface was bonded. Here, the black LN substrate refers to, from LN (LiNbO 3) crystallization remov...

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Abstract

An external resonator type light emitting system includes a light source oscillating a semiconductor laser light and a grating device providing an external resonator with the light source. The light source includes an active layer oscillating the semiconductor laser light. The grating device includes an optical waveguide having an incident face to which the semiconductor laser is incident and an emitting face of emitting an emitting light of a desired wavelength, a Bragg grating formed in the optical waveguide, and a propagating portion provided between the incident face and the Bragg grating. Formulas (1) to (4) are satisfied.

Description

technical field [0001] The present invention relates to an external resonator type light emitting device. Background technique [0002] A semiconductor laser generally adopts a Fabry-Perot (FP) type, and the Fabry-Perot (FP) comprises an optical resonator sandwiched between mirrors formed on both end surfaces of an active layer. However, this FP laser oscillates at a wavelength at which the standing wave condition is satisfied, so the longitudinal mode tends to become multimode, and in particular, when the current or temperature changes, the oscillation wavelength changes, thereby changing the light intensity. [0003] Therefore, for purposes such as optical communication and gas sensing, a single-mode laser with high wavelength stability is required. Therefore, distributed feedback (DFB) lasers or distributed Bragg reflective (DBR) lasers were developed. In these lasers, a diffraction grating is provided in a semiconductor, and only a specific wavelength is oscillated by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/14H01S5/12
CPCH01S5/0287H01S5/141H01S5/1039G02B6/124H01S5/02326H01S5/125
Inventor 近藤顺悟山口省一郎吉野隆史武内幸久
Owner NGK INSULATORS LTD
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