JPS6114482B2 - - Google Patents

Info

Publication number
JPS6114482B2
JPS6114482B2 JP16787082A JP16787082A JPS6114482B2 JP S6114482 B2 JPS6114482 B2 JP S6114482B2 JP 16787082 A JP16787082 A JP 16787082A JP 16787082 A JP16787082 A JP 16787082A JP S6114482 B2 JPS6114482 B2 JP S6114482B2
Authority
JP
Japan
Prior art keywords
optical
band
light
reflection filter
etalon
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
JP16787082A
Other languages
Japanese (ja)
Other versions
JPS5957205A (en
Inventor
Shigefumi Masuda
Akira Okamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP16787082A priority Critical patent/JPS5957205A/en
Publication of JPS5957205A publication Critical patent/JPS5957205A/en
Publication of JPS6114482B2 publication Critical patent/JPS6114482B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1861—Reflection gratings characterised by their structure, e.g. step profile, contours of substrate or grooves, pitch variations, materials
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1814—Diffraction gratings structurally combined with one or more further optical elements, e.g. lenses, mirrors, prisms or other diffraction gratings

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Filters (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)
  • Semiconductor Lasers (AREA)

Description

【発明の詳細な説明】 (1) 発明の技術分野 本発明は光学帯域反射フイルタ、特に各種光発
生器の高安定化、高効率化、ローコスト化に寄与
する高安定で狭帯域な反射特性を有する光学帯域
反射フイルタに関するものである。[Detailed Description of the Invention] (1) Technical Field of the Invention The present invention provides an optical band reflection filter, particularly a highly stable and narrow band reflection characteristic that contributes to high stability, high efficiency, and low cost of various light generators. The present invention relates to an optical band reflection filter having an optical band.

(2) 技術の背景と問題点 近年のレーザや光フアイバ等の技術の急速な進
展に伴い、光処理の重要性は一段と増している。
光処理に用いられる光学帯域反射フイルタとして
は、従来、回折格子や干渉膜フイルタが利用され
ていた。しかし、一般に回折格子等を用いて特定
周波数の光を分光した場合、波長分解能はそれ程
高くなく、例えば数10オングストローム（Å）以
下の狭帯域を実現することはできなかつた。その
ため、例えば半導体レーザにおいて、共振系を構
成するために回折格子を用いるとすると、反射波
の光位相は常に光入射位相に左右されることとな
るので、レーザ・ダイオードに帰還する光位相に
よつては、レーザ・ダイオードのノイズ増大につ
ながるという問題があつた。(2) Technical Background and Problems With the recent rapid progress in technologies such as lasers and optical fibers, the importance of optical processing is increasing further.
Conventionally, a diffraction grating or an interference film filter has been used as an optical band reflection filter used for light processing. However, when a diffraction grating or the like is used to disperse light at a specific frequency, the wavelength resolution is generally not that high, and it has not been possible to achieve a narrow band of, for example, several tens of angstroms (Å) or less. Therefore, if a diffraction grating is used to configure a resonant system in a semiconductor laser, for example, the optical phase of the reflected wave will always depend on the optical incident phase, and therefore will depend on the optical phase returning to the laser diode. Another problem was that it led to increased noise in the laser diode.

一方、狭帯域な光周波数成分を通過させるもの
としてエタロンが知られている。エタロンは平行
平板からなる一種の干渉フイルタであつて、狭帯
域特性に優れている。しかし、エタロンは目的中
心周波数f0の成分だけを透過させ、その他の成分
を反射させるので、反射光としては必要とする目
的中心周波数f0が逆に欠如したものが得られるこ
ととなり、反射フイルタとしてはそのまま利用す
ることはできない。 On the other hand, etalons are known as devices that pass narrow band optical frequency components. An etalon is a type of interference filter consisting of parallel flat plates, and has excellent narrow band characteristics. However, since the etalon transmits only the component with the target center frequency f 0 and reflects the other components, the reflected light will lack the required target center frequency f 0 , and the reflection filter It cannot be used as is.

(3) 発明の目的と構成 本発明は上記問題点の解決を図り、狭帯域な特
性を有する光学帯域反射フイルタを提供すること
を目的としている。そのため本発明の光学帯域反
射フイルタは、入射光から特定の光周波数成分を
濾波して反射する光学帯域反射フイルタにおい
て、フイルタ本体をエタロンで構成するととも
に、上記エタロンの一方の面を光回折格子面で構
成したことを特徴としている。以下図面を参照し
つつ実施例に従つて説明する。(3) Object and Structure of the Invention The present invention aims to solve the above-mentioned problems and provides an optical band reflection filter having narrow band characteristics. Therefore, the optical band reflection filter of the present invention is an optical band reflection filter that filters and reflects a specific optical frequency component from incident light, in which the filter body is composed of an etalon, and one surface of the etalon is an optical diffraction grating surface. It is characterized by being composed of. Embodiments will be described below with reference to the drawings.

(4) 発明の実施例 第１図は一般的なエタロンの説明図、第２図は
本発明の一実施例構成断面図、第３図は第１図図
示構成例の回折格子説明図、第４図は第１図図示
構成例の反射特性説明図、第５図は本発明を用い
た単一モード・レーザの例を示す。(4) Embodiments of the Invention Fig. 1 is an explanatory diagram of a general etalon, Fig. 2 is a sectional view of an embodiment of the present invention, and Fig. 3 is an explanatory diagram of a diffraction grating of the configuration example shown in Fig. 1. FIG. 4 is an explanatory diagram of the reflection characteristics of the configuration example shown in FIG. 1, and FIG. 5 shows an example of a single mode laser using the present invention.

一般にエタロンは、第１図図示の如く適当な反
射特性をもつ平行面からなるものであり、透過光
のスペクトル幅が例えば１Åの狭帯域特性をも
つ。反射光は中心周波数f0の部分が欠如して現わ
れる。本発明はこのエタロン効果を利用し、入射
光側への出射光として、第１図図示透過光のよう
な狭帯域の光を得ることができるようにするもの
である。 In general, an etalon is made of parallel surfaces having appropriate reflection characteristics as shown in FIG. 1, and has a narrow band characteristic in which the spectral width of transmitted light is, for example, 1 Å. The reflected light appears to lack a portion of the center frequency f 0 . The present invention utilizes this etalon effect to make it possible to obtain narrow band light such as the transmitted light shown in FIG. 1 as the output light to the incident light side.

本発明の帯域反射フイルタ（BRF）は、例え
ば第２図図示の如く構成される。構成としては単
純であり、図示の如くエタロン１の一方の面を光
回折格子面２とする。この光回折格子面２には、
適当な光反射率の反射膜をとりつけるとよい。 The band reflection filter (BRF) of the present invention is constructed, for example, as shown in FIG. The structure is simple, and one surface of the etalon 1 is used as an optical diffraction grating surface 2 as shown in the figure. On this optical diffraction grating surface 2,
It is advisable to attach a reflective film with an appropriate light reflectance.

光回折格子面２のブレーズ角は、例えば第３図
図示の如く、垂直に入射して同じ方向に反射する
光の光路長の差（２Δｌ）が、丁度、目的中心周
波数f0の波長に適合するように決定される。従つ
て、周波数f0以外の成分については、光出射角θ
ｉが周波数f0の場合とは異なり、入射方向に対し
ては、周波数f0のスペクトル成分だけが強調され
て、狭帯域光反射帯をもつこととなる。 The blaze angle of the optical diffraction grating surface 2 is such that, for example, as shown in Figure 3, the difference (2Δl) in the optical path length of the light that is perpendicularly incident and reflected in the same direction exactly matches the wavelength of the target center frequency f 0 It is decided that Therefore, for components other than frequency f 0 , the light emission angle θ
Unlike the case where i is the frequency f 0 , only the spectral component of the frequency f 0 is emphasized in the incident direction, resulting in a narrow optical reflection band.

反射特性は、例えば第４図図示の如く、目的中
心周波数f0の部分で減衰量が0dB、また周波数f0
から0.5Åだけ外れたところで−20dBの良好なも
のを得ることができる。 For example, as shown in Figure 4, the reflection characteristics have an attenuation of 0 dB at the target center frequency f 0 and a frequency f 0
A good value of -20 dB can be obtained when deviating by 0.5 Å.

この光学帯域反射フイルタを、例えば半導体レ
ーザに利用することによつて、高性能な単一モー
ド・レーザを実現することができる。第５図はそ
の一例を示している。第５図中、５は光吸収体、
６は帯域反射フイルタ、７はレーザ・ダイオー
ド、８は光フアイバを表わす。 By utilizing this optical band reflection filter in, for example, a semiconductor laser, a high performance single mode laser can be realized. FIG. 5 shows an example. In Fig. 5, 5 is a light absorber;
6 represents a bandpass reflection filter, 7 represents a laser diode, and 8 represents an optical fiber.

従来、高速・高安定なレーザ光を得ようとする
場合、レーザ・ダイオード７自体の性能を向上さ
せることに努力が向けられてきた。本発明に係る
帯域反射フイルタ６を利用すれば、次のように簡
単に目的を達成することができる。 Conventionally, when trying to obtain high-speed and highly stable laser light, efforts have been directed toward improving the performance of the laser diode 7 itself. By using the band reflection filter 6 according to the present invention, the following objectives can be easily achieved.

レーザの光出力を取り出す光フアイバ８の反対
側に帯域反射フイルタ６を配置し、帯域反射フイ
ルタ６、レーザ・ダイオード７、光フアイバ８の
順に縦続する。帯域反射フイルタ６の反射特性
は、レーザ・ダイオード７の発振光周波数f0の合
うようにする。レーザ・ダイオード７からは、光
フアイバ８側と帯域反射フイルタ６側とに光が出
射されるが、帯域反射フイルタ６は上記の如く狭
帯域の反射特性を持ち、中心周波数f0のスペクト
ル成分の部分だけをレーザ・ダイオード７に帰環
させる。従つて、高効率で高安定な単一のモー
ド・レーザが実現できることとなる。 A bandpass reflection filter 6 is arranged on the opposite side of the optical fiber 8 from which the optical output of the laser is taken out, and the bandpass reflection filter 6, the laser diode 7, and the optical fiber 8 are cascaded in this order. The reflection characteristics of the band-pass reflection filter 6 are made to match the oscillation optical frequency f 0 of the laser diode 7 . Light is emitted from the laser diode 7 to the optical fiber 8 side and the bandpass reflection filter 6 side, but the bandpass reflection filter 6 has a narrowband reflection characteristic as described above, and the spectral component of the center frequency f 0 is emitted from the laser diode 7. Only a portion is returned to the laser diode 7. Therefore, a highly efficient and highly stable single mode laser can be realized.

なお、第２図において、光回折格子面２を凹面
としてとりつけるようにしてもよい。 In addition, in FIG. 2, the optical diffraction grating surface 2 may be attached as a concave surface.

(5) 発明の効果 以上説明した如く本発明によれば、狭帯域な反
射特性をもつ光学帯域反射フイルタを提供するこ
とができる。例えば各種光発生器等に利用するこ
とによつて、それらの装置の高安定化、高効率
化、ローコスト化等が実現可能となる。(5) Effects of the Invention As explained above, according to the present invention, it is possible to provide an optical band reflection filter having narrow band reflection characteristics. For example, by using it in various light generators, etc., it becomes possible to realize higher stability, higher efficiency, lower cost, etc. of those devices.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は一般的なエタロンの説明図、第２図は
本発明の一実施例構成断面図、第３図は第１図図
示構成例の回折格子説明図、第４図は第１図図示
構成例の反射特性説明図、第５図は本発明を用い
た単一モード・レーザの例を示す。 図中、１はエタロン、２は光回折格子面、５は
光吸収体、６は帯域反射フイルタ、７はレーザ・
ダイオード、８は光フアイバを表わす。 Fig. 1 is an explanatory diagram of a general etalon, Fig. 2 is a sectional view of the configuration of an embodiment of the present invention, Fig. 3 is an explanatory diagram of the diffraction grating of the configuration example illustrated in Fig. 1, and Fig. 4 is an explanatory diagram of the configuration example illustrated in Fig. 1. FIG. 5, an explanatory diagram of reflection characteristics of a configuration example, shows an example of a single mode laser using the present invention. In the figure, 1 is an etalon, 2 is an optical diffraction grating surface, 5 is a light absorber, 6 is a band reflection filter, and 7 is a laser beam.
Diode 8 represents an optical fiber.

Claims (1)

【特許請求の範囲】[Claims] １ 入射光から特定の光周波数成分を濾波して反
射する光学帯域反射フイルタにおいて、フイルタ
本体をエタロンで構成するとともに、上記エタロ
ンの一方の面を光回折格子面で構成したことを特
徴とする光学帯域反射フイルタ。1. An optical band reflection filter that filters and reflects a specific optical frequency component from incident light, characterized in that the filter body is composed of an etalon, and one surface of the etalon is composed of an optical diffraction grating surface. Band-pass reflection filter.
JP16787082A 1982-09-27 1982-09-27 Optical band reflection filter Granted JPS5957205A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16787082A JPS5957205A (en) 1982-09-27 1982-09-27 Optical band reflection filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16787082A JPS5957205A (en) 1982-09-27 1982-09-27 Optical band reflection filter

Publications (2)

Publication Number Publication Date
JPS5957205A JPS5957205A (en) 1984-04-02
JPS6114482B2 true JPS6114482B2 (en) 1986-04-18

Family

ID=15857604

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16787082A Granted JPS5957205A (en) 1982-09-27 1982-09-27 Optical band reflection filter

Country Status (1)

Country Link
JP (1) JPS5957205A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH054226Y2 (en) * 1987-10-26 1993-02-02

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0602992B1 (en) * 1992-12-18 1999-03-03 Raytheon Company Grating-prism combination
DE19619478A1 (en) * 1996-05-14 1997-11-20 Sick Ag Optical arrangement with diffractive optical element
FR2985576B1 (en) * 2012-01-05 2014-10-17 Ulis INFRARED DETECTOR COMPRISING A CASE INTEGRATING AT LEAST ONE DIFFRACTION NETWORK

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH054226Y2 (en) * 1987-10-26 1993-02-02

Also Published As

Publication number Publication date
JPS5957205A (en) 1984-04-02

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