研究目的
To generate vortex beams with on-demand orbital angular momentum (OAM) using a V-folded digital laser with a spatial light modulator (SLM) for intra-cavity loss shaping.
研究成果
A V-folded digital laser has been employed to generate vortex beams with on-demand OAM. Hermite–Gaussian modes have been selectively generated from the digital laser by intra-cavity loss shaping. Accordingly, the vortex LG modes have been obtained by ??/2 mode converter. By proper design of the V-folded cavity, the limitation of damage threshold of the SLM and that of the crystal size are avoided to the most extent, consequently a large OAM-tunable range from ?11(cid:126) to 12(cid:126) has been obtained.
研究不足
The biggest limitation of this approach is on the output power, which is imposed by the damage threshold of the SLM.
1：Experimental Design and Method Selection:
A V-folded three-mirror cavity was employed, with a reflective SLM served as the folding mirror and two spherical mirrors on both ends. The angle between the two arms was about
2：2°. Sample Selection and Data Sources:
The gain medium used was a Nd:YAG crystal rod with a diameter of 3 mm and a length of 67 mm.
3：List of Experimental Equipment and Materials:
A reflective SLM (Pluto-NIR-011, Holoeye) with 1920 × 1080 pixels, a pixel pitch of 8 μm and a 60 Hz input image frame rate was used to implement intra-cavity loss shaping.
4：Experimental Procedures and Operational Workflow:
Different phase patterns were switched on the computer that controlled the SLM. Consequently, the resultant laser output were obtained without any mechanical alignment of the cavity.
5：Data Analysis Methods:
The beam quality (?? 2) of each mode was measured by a commercial beam quality analyzer with a CCD camera (Spiricon, M2-200s).
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
