フォトニック結晶ファイバ
フォトニック結晶ファイバ技術を用いて製造されたイッテルビウムおよびツリウムを添加したダブルクラッドファイバは、エアクラッドファイバとして知られ、多くの利点を有しています。ポンプコア / インナークラッドにおいて高NA (開口数)を実現できるため、低コストの励起光源や高出力のブロードエリア励起光源を用いた場合でも、高効率な励起が可能です。シングルモード信号用の大モードエリアにより、非線形効果を抑えつつ高出力動作に対応します。また、励起光導波領域と信号光導波領域の良好なオーバーラップにより、高い励起吸収効率を実現します。このファイバは、円形ポンプコアであっても優れたモードスクランブルおよび光線スクランブル効果を発揮し、オールガラス構造のため、標準的なダブルクラッドファイバよりも大幅に高い損傷閾値を備えています。
本ファイバはすべてシングルモードであり、標準的なマルチモードLMAファイバと比較して以下のような利点があります。
・高い出力安定性
・優れたビーム品質
・ファイバの強い曲げによるモード制御が不要
・ファイバの巻き付けに起因するモードエリアの圧縮がない
当社のイッテルビウムファイバ増幅モジュール aeroGAIN-BASEは、DC‑200 / 40‑PZ‑Ybファイバをベースにしており、ベアファイバでの取り扱いを避けたい場合は、aeroGAIN-BASEの利用が有効です。
| DC-135/14-PM-Yb | DC-200/40-PZ-Yb | DC-200/40-PZ-Si | DC-250/50-PM-Tm | |
| モード特性 | シングルモード | |||
| ビーム品質、代表値 @1064 nm | M2 < 1.2 | - | ||
| モードフィールド径、1/e² @1064 nm | 15 ± 1 μm | 31 ± 2 μm | 31 ± 2 μm | N/A |
| モードフィールド径、1/e² @1930 nm | N/A | 38.0 ± 2.5 μm | ||
| 励起クラッドNA @800 nm | N/A | ≥ 0.5 | ||
| 励起クラッドNA @950 nm | ≥ 0.5 | 0.55 ~ 0.65 | 0.55 ~ 0.65 | N/A |
| 励起吸収 @915 nm | 2.30 ± 0.35 dB/m | 3.75 ± 0.75 dB/m | N/A | N/A |
| 励起吸収 @976 nm、代表値 | ≈ 7 dB/m | ≈ 12 dB/m | N/A | N/A |
| 励起吸収 @1180 nm | N/A | 1.35 ± 0.35 dB / m | ||
| 励起吸収 @793 nm、代表値 | N/A | ≈ 5.5 dB / m | ||
| 複屈折 Δn @1100 nm、代表値 | ≥ 1 × 10-4 | N/A | ||
| 複屈折 Δn @2000 nm、代表値 | N/A | ≥ 1 × 10-4 | ||
| DC-135/14-PM-Yb | DC-200/40-PZ-Yb | DC-200/40-PZ-Si | DC-250/50-PM-Tm | |
| コア径 | ≈ 14 μm | ≈ 40 μm | ≈ 40 μm | ≈ 50 μm |
| クラッド | ダブル | |||
| 励起クラッド径 | 135 ± 3 μm | 200 ± 3 μm | 200 ± 3 μm | 250 ± 5 μm |
| 外側クラッド径 | 275 ± 8 μm | 450 ± 20 μm | 450 ± 20 μm | 560 ± 30 μm |
| コーティング径 | 360 ± 15 μm | 540 ± 30 μm | 540 ± 30 μm | 640 ± 40 μm |
| コーティング材料、単層 | 耐熱アクリレート | |||
| コーティング径外側クラッドおよび励起クラッド材料 | 純石英 | |||
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