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RGB laser generation from fiber MOPAs coupled to external enhancement cavities

机译：RGB激光从纤维MOPA耦合到外部增强腔

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Red (631 nm), green (532 nm), and blue (448 nm) continuous-wave (CW) lasers have been developed by Evans & Sutherland (E&S). These multi-watt RGB lasers arc used as light sources in E&S' laser projector (ESLP), which delivers ultrahigh-resolution content (8192 × 4096 pixels) to large-surface-area venues (e.g., planetariums, simulators, visualization centers, etc.). Efficient visible wavelength generation is obtained by coupling single-frequency nearinfrared (NIR) beams into free-space enhancement cavities containing critically phase-matched lithium triborate (LBO)crystals. The NIR energy is produced by a master-oscillator-power-amplifier (MOPA) system which is fiber-based, thus yielding Gaussian beams which are near-ideal for efficient fundamental-to-harmonic conversion. Both polarizationmaintaining (PM) fibers and non-PM fibers have been employed with non-PM fiber systems requiring polarization sensing and control. Green laser light is produced by a second-harmonic generation (SHG) process with a 1064 nm fundamental. Red laser light is produced by a sum-frequency mixing (SFM) process with 1064 nm and 1550 nm as fundamentals. Blue laser light is produced by an SFM process with 1064 nm and 775 nm as fundamentals, where 775 nm is first produced by an SHG process with a 1550 nm fundamental. All resulting visible lasers are single-axialfrequency with FWHM bandwidths less than 400 kHz, and are spatially pure with M~2 values less than 1.05. At least 18 W of CW optical power has been generated at all three visible wavelengths, with available NIR amplifier power as the primary limiting factor.
机译：红色（631纳米），绿色（532纳米），蓝色（448纳米）的连续波（CW）激光器已经被由Evans＆萨瑟兰（E＆S）开发。这些多瓦RGB激光电弧用作E＆S”的激光投影仪（ESLP），它提供了超高分辨率内容（8192×4096像素），以大表面面积的场地（例如，天象仪，模拟器，可视化中心等光源）。高效可见波长生成是由单频近红外（NIR）波束耦合入含有临界相位匹配三硼酸锂（LBO）晶体自由空间增强空腔获得。近红外能量由主振荡器 - 功率放大器（MOPA）系统，该系统是基于纤维的产生，从而产生高斯光束，其是接近理想的高效基本至谐波转换。两个偏振的（PM）纤维和非PM光纤已经使用了与需要极化的感测和控制非PM光纤系统。绿色激光通过二次谐波产生（SHG）过程有1064nm基本生产。红色激光通过具有1064纳米和1550纳米的基本面和频混频（SFM）过程中产生的。蓝色激光的光由SFM处理与1064纳米和775纳米作为基本原理，其中775纳米由SHG过程与1550纳米基本首先生产制造。所有所得的可见激光是单axialfrequency与FWHM带宽小于400kHz的，和在空间上与纯M〜小于1.05小于2倍的值。 CW光功率的至少18瓦已经在所有三个可见波长产生的，与现有NIR放大器功率作为主要限制因素。

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