臺灣博碩士論文加值系統

隨著半導體技術的發展，雷射科技與雷射二極體隨著時間的演進能夠做到越來越小、低價、高功率、高轉換效率等，而雷射二極體也越來越廣泛的應用作為各種光源來使用。但是雷射二極體本身存在著一些待改善的問題例如，大多為多模態輸出、較寬的半高全寬、以及易受環境干擾影響品質，本論文運用外腔雷射的技術來解決多數雷射二極體的問題，我們運用一個繞射光柵來做為頻率篩選及回饋光學元件，將繞射光回饋回雷射二極體，經由外腔雷射，我們能夠創造出一種單模、窄線寬以及更加穩定的雷射光源。根據於本實驗室先前的研究，外腔雷射的轉換效率約為60%左右，對於許多的應用上，外腔雷射雖然品質高但是功率卻有不足的問題，因此我們利用注入鎖定的技術來解決外腔雷射功率不足的問題，利用一個窄線寬、低雜訊、高品質的外腔雷射耦合到一個頻率相近且高功率、寬線寬的二極體，在某些特定的條件下，高品質雷射的模態會吸收將高功率雷射的能量，使得這個雷射二極體會輸出窄線寬、高品質且又具有高功率的雷射訊號，雖然整體二極體雷射會相較相同電流強度約為80%左右，但是已經能很好的解決外腔雷射的問題。而我們在實驗中，發現綠光的二極體雷射與綠光外腔雷射注入鎖定時，發生一種週期性得變化，對於此特殊的現象，本論文也對此予以討論，並給出一些實驗上的結論，最後這個高功率高品質雷射，希望能運用在拉曼光譜學及碘分子光譜的應用上。

With the development of semiconductor technology, laser diodes(LDs) have tiny size, cheap cost, and high luminous efficiency. LDs have been more and more extensively applied as good light sources. But LDs still have problems, such like multimode, widely linewidth and easily affected by environment interferences. By applying external cavity diode laser (ECDL) construction with grating feedback on LDs. We can create a single-mode, narrow linewidth and more stable light source. According to single-frequency external cavity green diode laser on previous research works in our group, the conversion efficiency of ECDL is about 60%. The ECDL output power may be not enough to some applications as light sources. The injection locking technique is the appropriate solution for boosting the laser power. The narrow linewidth and low power ECDL were used as a master laser, and trying to inject the master laser beam to a high power and wide bandwidth LD. We can obtain the laser beam from the LD with narrower and more stable linewidth. But the power can be reduced to around 80%. With the injection locking technique, we can produce a high power, narrow linewidth, stable and single mode light source.
Discovered the injection locking in green direct LD, ECDL and LD system has been found out the periodical phenomenon of laser cavity mode matching. To verify the reason of periodical phenomenon, changing LD operation conditions and analysis the laser modes have been important. This thesis also investigated some particular phenomenon on an ECDL laser was been injected lock with another LD, which like locking range, linewidth variation.

Abstract iㄛ
致謝 IV
Contents V
List of Tables IX
Chapter 1 1
1-1 Introduction 1
1-2 motivation 2
1-3 Overview of this thesis 3
1-4 The literature Reviews 3
Chapter 2 Principle of thesis 6
2-2-1 Injection locking 6
2-2-2 ECDL 8
2-3 Optical Isolator 11
2-4 Mode Hopping 12
Chapter 3 Laser diode and ECDL 15
3-1 Laser diode and ECDL configuration 15
3-2-1 Laser diode output power 17
3-2-2 Laser diode mode analyze 19
3-2-3 Summary 25
3-3 External cavity diode laser 25
3-3-1 External cavity diode laser output power 25
3-3-2 spectrum of ECDL 26
3-3-3 ECDL linewidth 27
Chapter 4 Injection Locking 30
4-1 Injection locking 30
Chapter 5 Conclusion 42
5-1 conclusions 42
5-2 Future work 43
Reference 44

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