JPS5861689A - Multi-wavelength ring laser gyroscope - Google Patents
Multi-wavelength ring laser gyroscopeInfo
- Publication number
- JPS5861689A JPS5861689A JP15993981A JP15993981A JPS5861689A JP S5861689 A JPS5861689 A JP S5861689A JP 15993981 A JP15993981 A JP 15993981A JP 15993981 A JP15993981 A JP 15993981A JP S5861689 A JPS5861689 A JP S5861689A
- Authority
- JP
- Japan
- Prior art keywords
- laser
- faraday element
- faraday
- crystal
- ring laser
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/083—Ring lasers
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
- Gyroscopes (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は多波長リングレーザ−ジャイロスコープに関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multiwavelength ring laser gyroscope.
リングレーザ−共振器中に偏光方向について相反的、非
相反的な回転を与える素子をそう人し。Ring laser - An element that provides reciprocal and non-reciprocal rotation of the polarization direction in the cavity.
４波長でレーザーを発振させ、その周波数差を計数する
ことにより回転角速度を検出するジャイロスコープが既
に考案されている（例えば％８ＰＩＥＶＯＩ−１５７’
Ｖ−ザー慣性回転セ：ｙｔ、Ｂ Ｐ２１〜３０）。A gyroscope has already been devised that detects rotational angular velocity by emitting a laser at four wavelengths and counting the frequency difference (for example, %8PIEVOI-157'
V-zer inertial rotation center: yt, B P21-30).
従来の４波長リングレーザ−は、第１図に示される構成
をもつ。共振器内に素子がそう人されない状態で縮退し
ている右回シ円偏光モード（ａｃ ｐ）。A conventional four-wavelength ring laser has the configuration shown in FIG. The right-handed circularly polarized mode (ac p) is degenerated with no elements inside the resonator.
左回シ円偏光モード（ＬＣＰ） は、飾光性素子（水
晶など）をそう人することによシ分離され、さらにファ
ラデー素子をそう人する事によシ時計回りモード（ＣＷ
）１反時針回りモード（ＣＣＷ） の間に***が与え
られ、レーザー発振周波数は、第２図の様になる。この
ようなモード構成をもつυノブレーザーが回転すると、
ＣＷモードがΔｆだけ周波数シフトし、ＣＣＷモードが
−６１周波数シフトするため、第１図に示される光学系
をもちいて２Δｆのビートを観測することがで舞る。こ
の多［長り／グレーザーにおいては％Ｌ、ＣＰモード間
、もしくは、 ｆＬｃＰモード間の周波数差が小さくな
るとモード競合により、ビート周波数に非線形性を生じ
ジャイロスコープとしての機能が劣化する。これは、回
転角速度が大匙くなシ１回転による周波数シフトΔｆが
ファラデー素子による分離とほぼ等しくなると起こる現
象である。The left-handed circularly polarized mode (LCP) can be separated by adding a decorative element (such as a crystal), and the clockwise mode (CW) can be separated by using a Faraday element.
) 1 counterclockwise clockwise mode (CCW), and the laser oscillation frequency becomes as shown in Fig. 2. When a υ knob laser with such a mode configuration rotates,
Since the CW mode has a frequency shift of Δf and the CCW mode has a frequency shift of -61, it is possible to observe a beat of 2Δf using the optical system shown in FIG. In this multi-length/glazer, when the frequency difference between %L, CP modes, or fLcP modes becomes small, nonlinearity occurs in the beat frequency due to mode competition, and the function as a gyroscope deteriorates. This is a phenomenon that occurs when the frequency shift Δf due to one rotation of the rotational angular velocity is approximately equal to the separation by the Faraday element.
しかし、ジャイロスコープとしての利用する立場におい
ては、大きな回転角速度は、−リ定の必唆がなく非常に
小さな領域のみの測定が必要となるものが数々ある（例
えば、衛星姿勢制御など）。However, when used as a gyroscope, there are many cases in which large rotational angular velocities require measurement of only a very small area without the necessity of constant rotation (for example, satellite attitude control, etc.).
このような場合、ファラデー素子による分離は、必要以
上に大きくとる必要はない。In such a case, the separation by the Faraday element does not need to be larger than necessary.
本発明の目的は上記欠点を除いたリングレーザを提供す
ることである。The object of the present invention is to provide a ring laser which eliminates the above-mentioned drawbacks.
本発明によるバイアス方式を第３図に示す。A biasing system according to the present invention is shown in FIG.
ＬＣＰ、ＲＣＰの分離には、水晶を用いる。レーザース
ペクトルのゲイン幅、隣接縦モードの非交叉を考慮する
とＬＯＰ、凡ＣＰの分離は２００ＭＩＩＺ程度が適当で
あり、水晶は、１８．６ ｄｅｇ／ｍｍの施光角をもつ
ため約６．５酊の水晶を用いればよい。又水晶は同じ軸
方向でファラデー効果をもりてお９゜ソノブエルテ定数
は０．０１９１Ｅｉｌ／ ｃｍ−Ｏｅである。A crystal is used to separate LCP and RCP. Considering the gain width of the laser spectrum and the non-crossing of adjacent longitudinal modes, the appropriate separation between LOP and CP is approximately 200 MIIZ, and since crystal has a beam angle of 18.6 deg/mm, it is approximately 6.5 deg/mm. You can use a crystal of Also, crystal has a Faraday effect in the same axial direction, and the 9° Sonobuerte constant is 0.0191 Eil/cm-Oe.
従って水晶に磁場を与えることによシ、第１図に示され
るファラデー素子の機能をもたせることが可能である。Therefore, by applying a magnetic field to the crystal, it is possible to provide the function of the Faraday element shown in FIG. 1.
磁場として小型の電磁石で容易に与えうる、２ Ｘ １
ｏ’Ａ／ｍ程度のものを考えると７８Ｋ Ｈｚ程度の
７アレデ一分離が与えられることとなる。これは、１辺
５５ｃｍのリングレーザ−の場合、角速度に換算すると
６グ／ ｓｅｃとなるため前に述べたような利用におい
ては十分なダイナミックレンヂを与えるものである。本
発明によればレーザー共振器にファラデー素子をそう人
しなくてすむためファラデー素子の端面の反射吸収ミス
アライメント等レーザー発振に悪影響を及ぼす原因を除
け、又反射散乱によるモード結合効果が減少するため、
レーザージャイロスコープとしての性能が向上する利点
をもつ。A magnetic field of 2 x 1 can be easily applied using a small electromagnet.
Considering something of the order of o'A/m, 7 arede-1 separation of about 78 KHz will be given. In the case of a ring laser with a side of 55 cm, this is converted into an angular velocity of 6 g/sec, which provides a sufficient dynamic range for the above-mentioned use. According to the present invention, since there is no need to install a Faraday element in the laser resonator, causes that adversely affect laser oscillation such as reflection/absorption misalignment of the end face of the Faraday element are eliminated, and mode coupling effects due to reflection and scattering are reduced. ,
It has the advantage of improving performance as a laser gyroscope.
第１図は従来のファラデー素子と飾光性物質（水晶）を
別々に用いてバイアスをかける多波長リングレーザ−ジ
ャイロスコープの概略図、第２図は多波長（４モード）
す／グレーザージャイロスコープのモード構造を示す図
、第３図は本発明による多波長υノブレーザージャイロ
スコープのバイアス方式を示す図である。
１・・・・・・旋光性をもつファラデー素子、２・川・
・ミラー、３・・・・・・電磁石。
竿１ｆＵ
整２■
寮３功Figure 1 is a schematic diagram of a conventional multi-wavelength ring laser gyroscope that is biased using a Faraday element and a decorative substance (crystal) separately. Figure 2 is a multi-wavelength (4-mode) ring laser gyroscope.
FIG. 3 is a diagram showing the mode structure of a laser/grazer gyroscope, and FIG. 3 is a diagram showing a bias method of a multi-wavelength υ-knob laser gyroscope according to the present invention. 1... Faraday element with optical rotation, 2. River...
・Mirror, 3... Electromagnet. Pole 1fU Preparation 2 ■ Dormitory 3 Gong
Claims (1)
ファラデー効果を利用することにより、ロックイノ除去
のバイアスを与えることを特徴とする多波長す／グレー
ザージャイロスコープ。A multi-wavelength laser/glazer gyroscope characterized in that, in a four-wavelength ring laser, a bias for lock-in removal is provided by utilizing the Faraday effect of a light-sparing substance within the resonator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15993981A JPS5861689A (en) | 1981-10-07 | 1981-10-07 | Multi-wavelength ring laser gyroscope |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15993981A JPS5861689A (en) | 1981-10-07 | 1981-10-07 | Multi-wavelength ring laser gyroscope |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5861689A true JPS5861689A (en) | 1983-04-12 |
Family
ID=15704455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15993981A Pending JPS5861689A (en) | 1981-10-07 | 1981-10-07 | Multi-wavelength ring laser gyroscope |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5861689A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674002A (en) * | 2012-09-07 | 2014-03-26 | 中国航空工业第六一八研究所 | Faraday alternating offset frequency two-frequency laser gyroscope |
| CN109489651A (en) * | 2018-10-31 | 2019-03-19 | 中国人民解放军国防科技大学 | Four-frequency differential laser gyro Faraday magneto-optical glass installation method |
| CN109489686A (en) * | 2018-10-31 | 2019-03-19 | 中国人民解放军国防科技大学 | Method for testing bandwidth and angular resolution of four-frequency differential laser gyroscope |
-
1981
- 1981-10-07 JP JP15993981A patent/JPS5861689A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674002A (en) * | 2012-09-07 | 2014-03-26 | 中国航空工业第六一八研究所 | Faraday alternating offset frequency two-frequency laser gyroscope |
| CN109489651A (en) * | 2018-10-31 | 2019-03-19 | 中国人民解放军国防科技大学 | Four-frequency differential laser gyro Faraday magneto-optical glass installation method |
| CN109489686A (en) * | 2018-10-31 | 2019-03-19 | 中国人民解放军国防科技大学 | Method for testing bandwidth and angular resolution of four-frequency differential laser gyroscope |
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