Mukhopadhyay Pranb K, Gupta Pradeep K, Singh Chandra Pal, Singh Amarjeet, Sharma Sunil K, Bindra Kushvinder S, Oak Shrikant M
Solid State Laser Division, Raja Ramanna Center for Advanced Technology, Indore, M.P. 452013, India.
Rev Sci Instrum. 2015 Mar;86(3):033103. doi: 10.1063/1.4913749.
We have constructed an Yb-doped fiber laser in all-normal-dispersion configuration which can be independently operated in Q-switched or modelocked configuration with the help of a simple fiber optic ring resonator (FORR). In the presence of FORR, the laser operates in Q-switched mode producing stable pulses in the range of 1 μs-200 ns with repetition rate in the range of 45 kHz-82 kHz. On the other hand, the laser can be easily switched to mode-locked operation by disjoining the FORR loop producing train of ultrashort pulses of ∼5 ps duration (compressible to ∼150 fs) at ∼38 MHz repetition rate. The transmission characteristics of FORR in combination with the nonlinear polarization rotation for passive Q-switching operation is numerically investigated and experimentally verified. The laser can serve as a versatile seed source for power amplifier which can be easily configured for application in the fields that require different pulsed fiber lasers.
我们构建了一种全正色散配置的掺镱光纤激光器，借助一个简单的光纤环形谐振器（FORR），它可以在调Q或锁模配置下独立运行。在有FORR的情况下，激光器工作在调Q模式，产生脉宽在1 μs至200 ns范围内、重复频率在45 kHz至82 kHz范围内的稳定脉冲。另一方面，通过断开FORR环路，激光器可以轻松切换到锁模运行，产生持续时间约为5 ps（可压缩至约150 fs）、重复频率约为38 MHz的超短脉冲序列。对FORR的传输特性与用于被动调Q操作的非线性偏振旋转相结合进行了数值研究和实验验证。该激光器可作为功率放大器的通用种子源，能够轻松配置以应用于需要不同脉冲光纤激光器的领域。
