Comparative Experimental Analysis of Thermal Characteristics of Ytterbium-Doped Phosphosilicate and Aluminosilicate Fibers

Abstract

We present a comparative experimental analysis of the thermal spectroscopic characteristics of a phosphosilicate (P)-based ytterbium-doped fiber (YDF) against an aluminosilicate (Al)-based YDF in the temperature range of 25 to 150ºC. We also characterize the fibers as gain media in a cladding-pumped amplifier configuration. While both fibers exhibit comparable trends in their thermal characteristics, there are noticeable distinctions in the fluorescence lifetime reduction rate and the spectral dependence of the transition cross-sections. The P-and Al-based YDFs present thermal lifetime reduction rates of 0.012%/ºC and 0.026%/ºC, respectively. In particular, in the spectral region at ~940 nm, the absorption cross-section of the P-based YDF undergoes significantly less thermal change compared to that of the Al-YDF. In the cladding-pumped amplifier configuration operating at a total gain of 10 dB, the Al-based YDF generally performs betters than the P-based YDF in the temperature range of 25 to 75ºC. However, it is highlighted that in the high temperature range of over 75ºC, the latter shows a less gain reduction rate than the former, thereby yielding higher relative output power by 3.3% for a 1060-nm signal, for example.

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“…레이저의 출력 수준이 상승하고, 빔 품질이 향상됨에 따라 레이저는 통신, 정밀 측 정, 바이오, 의료에서부터 대형 구조물의 드릴링, 용접, 절단, 또한, 국방에 이르기까지 폭넓은 분야에서 중추적인 기술 요 소로 자리 매김을 하고 있다 [1][2][3][4][5][6][7][8] . 레이저 시스템은 다양한 방 식으로 구성될 수 있는데, 최근에는 광섬유를 이득 매질로 하는 광섬유 레이저가 벌크(Bulk) 방식 레이저 시스템과 대 비되는 다양한 장점에 힘입어 많은 연구 및 개발 관심을 받 고 있다 [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] . [11] .…”

Rigorous Analysis on Ring-Doped-Core Fibers for Generating Cylindrical Vector Beams

“…In addition, when the core become larger, the OVF of the LCVM tends to converge to that of the fundamental mode. However, this does not mean any improvement for the LCVM generation in terms of the mode selection because as the core size increases, it also becomes a guide for other higher-order modes (HOMs), which in turn reduce the possibility of the LCVM generation [16,26]. On this account, a desirable operating regime of a fiber is the case when it only supports modes up to the LCVM.…”