一維光孤子在非靜止座標系中之實驗觀察

Abstract

利用光去控制流動的流體是一個非常有趣的議題。在這本論文中，我們想要簡化這個議題。首先，我們可以把移動的流體視為非靜止的座標系。第二，利用光去控制流體是非即時的反應。最後，我們希望在未來可以使用低光學功率的光去控制流動的流體。依據這些原因，我們可以去觀察低光學功率的光孤子在橫向移動的非即時反應的光折變晶體中，去模擬在流動的流體中如何去控制流體的折射率以及光孤子的穩定性。因此，在這本論文中，我們呈現出光孤子在非靜止座標系中的實驗結果。 我們把光折變晶體安裝在一個線性平移台中，並且以一橫向速度去移動平移台，因此可以把它當成一個非靜止的座標系。然後，我們去觀察光孤子在不同組的橫向移動速度的行為。在我們的觀察中，有三組不同的行為對應到不同的速度區間。最後我們嘗試對這些現象提出了解釋。

Using light to control the fluid flow is a very interesting issue. In this dissertation, we want to simplify this issue. First, the fluid flow can be treated as a non-rest frame. Second, The response of light-controlled fluid flow is noninstantaneous. Final, we want to use low optical power to control fluid flow in the future. For these reasons, we can observe the low optical power soliton in a laterally shifting noninstantaneous photorefractive crystal to simulate the controlling of the refractive index and soliton stability in the fluid flow. As a result, we present the experimental observation of optical soliton in a non-rest frame in this dissertation. We use the photorefractive crystal on linear stage to be a non-rest frame, and move the linear stage with a laterally shifting speed. After that, we observe the behavior of solitons versus different lateral shift speed of the crystal. We find there are three phase with different velocity region in this observation. Finally, we attempt to explain these results.