CAJ | 학술논문

为了研究横向分布为平顶高斯模式的宽带激光通过硬边光阑系统的光强分布特性，采用衍射积分公式推导了平顶高斯模式宽带激光的每一频率分量在光阑系统中的传输公式，再通过傅里叶变换得到时间域的传输公式，详细分析了光阑和频带宽度对强度分布的影响。结果表明，近场光强在截断参量较大时，仍保持一定的平顶分布特性，但是随带宽的增加强度分布变窄；截断参量较小时强度呈高斯分布，并且带宽的变化对强度分布没有太大影响；然而在远场时截断参量较小情况下的光强分布也明显表现出随带宽增加而变窄的现象，但随着截断参量增大，这一变化趋势变缓。这些结果对平顶高斯模式宽带激光的应用具有重要参考价值。
위료연구횡향분포위평정고사모식적관대격광통과경변광란계통적광강분포특성，채용연사적분공식추도료평정고사모식관대격광적매일빈솔분량재광란계통중적전수공식，재통과부리협변환득도시간역적전수공식，상세분석료광란화빈대관도대강도분포적영향。결과표명，근장광강재절단삼량교대시，잉보지일정적평정분포특성，단시수대관적증가강도분포변착；절단삼량교소시강도정고사분포，병차대관적변화대강도분포몰유태대영향；연이재원장시절단삼량교소정황하적광강분포야명현표현출수대관증가이변착적현상，단수착절단삼량증대，저일변화추세변완。저사결과대평정고사모식관대격광적응용구유중요삼고개치。
In order to study intensity distribution of a broadband laser with flattened-Gaussian transverse modes passing through a hard-edged aperture , the propagation expression of each frequency component of the broadband laser was deduced on the basis of the diffraction integral , and then the propagation expression in spatial domain was obtained by means of Fourier transform .Effect of the aperture and the bandwidth on the intensity distribution was analyzed .The results show that the intensity distribution keeps somewhat flattened profile and the profile become narrower with increasing bandwidth when the truncation parameter is large in the near field .When the truncation parameter is small , the intensity distribution is Gaussian profile and the bandwidth has little effect on the profile .In the far field, however, the profile of the intensity also presents narrowing effect with increasing bandwidth when the truncation parameter is small and the narrowing effect tends to decrease with increasing truncation parameter . The results have significant value for applications of broadband laser with flattened-Gaussian transverse mode .