16721概述-光腔理論的一般問題-文庫吧資料
2024-07-30 19:03本頁面
【正文】 cal resonators when they are used as laser oscillators. Scattering from inhomogeneities and imperfections is especially serious in solidstate laser media.) 固有損耗： 深圳大學(xué)電子科學(xué)與技術(shù)學(xué)院 ? 后兩種損耗稱為 非選擇損耗 ，通常情況下它們對各個模式大體一樣。 (Reflection loss is unavoidable, since without some transmission no power output is possible. In addition, no mirror is ideal。 深圳大學(xué)電子科學(xué)與技術(shù)學(xué)院 ? The oscillation frequency is determined by the requirement that phase delay per round trip be some integer, say q, of 2?. ? The integer q corresponds to the number of maxima of the standing wave interference pattern between the two reflectors. 深圳大學(xué)電子科學(xué)與技術(shù)學(xué)院 七 光腔的損耗 (losses in optical resonators) An understanding of the mechanisms by which electromagic energy is dissipated in optical resonators and the ability to control them are of major importance in understanding and operating a variety of optical devices. For historical reasons as well as for reasons of convenience, these losses are often characterized by a number of different parameters. This book uses the concepts of loss per pass, photon lifetimes, and quality factor Q to describe losses in resonators. 深圳大學(xué)電子科學(xué)與技術(shù)學(xué)院 ?損耗類型 (loss mechanisms ) ? 幾何偏折損耗 ? 衍射損耗 (diffraction losses) ? 腔鏡反射不完全引起的損耗 (loss resulting from nonperfect reflection) ? 固有損耗 (absorption and scattering in the laser medium) 深圳大學(xué)電子科學(xué)與技術(shù)學(xué)院 ? 光線在腔內(nèi)往返傳播時，從腔的側(cè)面偏折逸出的損耗。 ? 通常將由整數(shù) q所表征的腔內(nèi)縱向光場的分布稱為腔的縱模 ，不同的 q相應(yīng)于不同的縱模，或相應(yīng)于駐波場波腹的個數(shù)。 ? 滿足此條件的平面駐波場稱為腔的本征模式 ? 特點： 腔內(nèi)光強沿 z軸的分布不是均勻的，而是強弱相間地分布著。 深圳大學(xué)電子科學(xué)與技術(shù)學(xué)院 ? 此式又稱為 駐波條件 。 2 22qLq???? ?? ? ? ? ? 2qLq?? ??
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