Echelle - Echelle

Japanese: エシェル - えしぇる
Echelle - Echelle

…α in the figure is called the blaze angle, and the wavelength at which the intensity of the primary light is at its maximum is called the blaze wavelength, but the latter is often defined as the wavelength of the primary diffracted light that returns in the same direction when the incident light is perpendicular to the groove surface. A coarse echelette grating with (several hundred to several tens of lines)/mm is made for the ultraviolet and visible ranges, and the steep side is used as in Figure 3. It is an echelle that aims to obtain high resolution by using the high-order spectrum with a large m , but an auxiliary spectroscopic system for order separation is required, as in multi-beam interference spectroscopy. …

*Some of the terminology explanations that mention "Echelle" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…図のαをブレーズblaze角,一次光の強度が最大となる波長をブレーズ波長と呼ぶが,後者は溝面に垂直に入射光を入れたとき同方向に戻る一次回折光の波長で定義することが多い。紫外・可視域に対して(数百~数十本)/mmの粗いエシェレット格子を作り,図3のように急斜面側を使うようにしたものをエシェルechelleという。mの大きい高次スペクトルを利用して高分解能を得ようとするものであるが,多光束干渉分光法と同様次数分離のための補助分光系が必要である。…

※「エシェル」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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