Development of a Microchip Ultrashort Light Pulse Generator

我们正在推进一个项目，开发“集成可调谐激光器”，在一个芯片上实现可调谐激光器的各种功能。作为该项目的第一步，我们研制了具有分布反馈(DFB)结构的波导型染料激光器。由于该激光器的尺寸仅为5 mm，在纳秒脉冲激光的泵浦下呈现出几十ps的尖峰振荡。本项目的目的是研制一种采用塑料波导激光器的单片超短光脉冲发生器。以下是这两年的研究成果总结。当采用脉冲宽度为ns的调Q激光泵浦具有罗丹明-6G掺杂PMMA波导的DEB染料激光器时，产生了一系列脉冲宽度约为50ps的尖峰。通过将可饱和染料DODGI与罗丹明60染料混合到波导中，将脉冲宽度缩短到约20ps。通过经过集成脉冲压缩器，该脉冲被进一步缩短到小于8ps，其中包含罗丹明6G和DODCI混合物的波导交替地抽运和未抽运区域。计算机模拟表明，通过降低光波导中的传输损耗，可以将脉冲压缩到飞秒级。下一个目标是在2-3微米波段对氢氧化氢进行转盘测量。

We are promoting a project to develop 'Integrated Tunable Lasers' in which various functions of tunable lasers are realized on a single chip. As the first step of this project, we developed a waveguided dye laser with the distributed feedback (DFB) configuration. This laser shows the spiking oscillation with a duration of several tens ps by the pumping of a ns pulsed Nd : YAG laser, because the size is only 5 mm long.The purpose of this project is to develop a single-chip ultrashort light pulse generator using a plastic-waveguided laser. Followings are the summary of research results for these two years.1. When a DEB dye laser with a Rhodamine-6G-doped PMMA waveguide is pumped by a Q-switched Nd : YAG laser with ns pulse duration, a series of spikes with about 50 ps duration are generated.2. This pulse duration is shortened down to about 20 ps by mixing a saturable dye DODGI into the waveguide together with Rhodamine 60 dye.3. This pulse is further shortened to less than 8 ps by passing through an integrated pulse compressor in which the waveguide containing a mixture of Rhodamine 6G and DODCI has alternatively pumped and unpumped regions.4. The computer simulation shows that the pulse compression down to fs region is possible by decreasing the transmission loss in the waveguide.The next target is the DIAL measurement of OH_4 at the 2-3mum band.