고출력 광양자테 레이저 및 비평행-준평행 마이크로 콜리메이터 연구
- 고출력 광양자테 레이저 및 비평행-준평행 마이크로 콜리메이터 연구
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- We now have fabricated the PQR to replace LED and Micro-collimator to replace selfoc-lens array.LED is a spontaneous emission device, has many limit. LED can further be replaced by an efficient laser like the photonic quantum ring (PQR) laser diode with extremely low threshold currents and √T-dependent thermally stable spectral properties good for fast, high density array applications. The multi-petal flower PQR laser is also very superior in near-vertical lasing, luminous efficiency, dynamic range and color purity, leading to superior Gaussian beam profiles converted from initial Laguerre-Gaussian beams within 50 to 100 microns ranges. For instance, high-power 12-petal flower PQR lasers of mesa type vertical cavity, consisting of a QW active region sandwiched by p- and n- type distributed Bragg reflector (DBR) structures, out-perform the LEDLaser printers with mechanically rotating polygon mirrors have been used widely in offices, whereas new LED printers, quiet and all-electronic drive circuitry with no moving parts, begin to replace them. However, typical LED printers use selfoc-lens arrays (SLAs) to concentrate and guide individual light, but the expensive SLA technology is complicated and monopolized by a Japanese co. On the other hand, we have developed a micro-collimator for non-parallel to parallel beam guiding to replace the SLA technology. The micro-collimator can be fabricated through a few processing steps, once its ray optics design is optimized for light microguiding with right focal lengths. In order to fabricate the micro-collimator we use a photoresist reflow method and soft molding. A photoresist layer is patterned by conventional photolithography and an array of dots reflow into multi- lens shape. We then transfer the photoresist microstructure to a Polydimethylsiloxane (PDMS) by a casting method. The PDMS is spin coated where the coating revolutions per minute (rpm) should be adjusted for proper thickness. Details of the design, its fabrication, and the results will be described.
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