由於目前兩段式被動鎖模量子點樣品的實驗中，還是無法達到基態至激發態的連續 調變，推測其原因可能為於飽和吸收體加了逆向偏壓，使得外腔式雷射無法克服飽和吸 收體的額外吸收，造成外部損耗太大，因此無法使用繞射光柵做外腔式雷射的波長調變，
若要改善此問題必須想辦法提高原雷射增益或降低外腔式雷射臨界增益，且將鏡面損耗 降之最低。且我們希望能減少脈衝寬度，目前元件脈衝寬度受限於繞射光柵的選擇，希
望藉由選擇光柵條紋密度較低的繞射光柵，來嘗試改善此問題。
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