本文介紹了利用光子晶體光纖作為增益介質，分別使用不同的架構探討脈衝式光子晶體光纖雷射的特性， 分別為：（1)主動式Q開關光子晶體光纖雷射、（2)被動式Q開關光子晶體光纖雷射、以及（3)光子晶體 光纖放大器。其中在Q開關雷射部分使用主動式可以得到10千赫茲的脈衝重覆率，其脈衝能量為0.51毫 焦耳，脈衝寬度為18.3奈秒。使用被動式脈衝重覆率為6.5千赫茲，能量為1.1毫焦耳，脈衝寬度約為 10奈秒之脈衝雷射。為了進一步縮短脈衝雷射之脈衝寬度，我們也利用光子晶體光纖為增益介質，搭配 Nd:YV〇4/Cr4+:YAG之被動式Q開關的種子源雷射作為光纖放大器，此架構可得脈衝寬度為2.2奈秒，脈 衝重覆率為14.9千赫茲，脈衝能量為0.22毫焦耳之脈衝雷射，將來利用光束耦合的方式來進一步提升脈 衝雷射的輸出功率及能量。

We used the photonic crystal fiber (PCF) as the gain medium to investigate the performances of the pulsed PCF lasers by various schemes such as (1) actively Q-switched PCF laser, (2) passively Q-switched (PQS) PCF laser, and
(3) PCF amplifier. We can attain pulsed laser source with pulse energy of 0.51 mJ and pulse duration of 18.3 ns at the pulse repetition rate (PRR) of 10 kHz by means of active Q-switching. Employing an AlGaInAs multi-quantum-well semiconductor materials the saturable absorber to form a passively Q-switched scheme, we can obtain pulsed PCF laser with pulse energy of 1.1 mJ and pulse duration of 10 ns at the PRR of 6.5 kHz. To further shorten the output pulse duration, we use the PQS Nd:YV〇4/Cr4+:YAG laser as the seed to amplify. At the PRR of 14.9 kHz, output pulses with pulse duration of 2.2 ns and pulse energy of 0.22 mJ were achieved. In the nearly future, we will use the beam combining method to further scale up the pulse energy and output power of the pulsed PCF lasers.