Parasitic oscillation suppression in high-gain solid-state amplifiers

Zhang, Yongliang; Wei, Xiaofeng; Li, Mingzhong; Zheng, Jiangang; Zhang, Junwei; Xie, Na; Wang, Zhenguo; Wang, Mingzhe; Xia, Yan; Jiang, Xiaotong

doi:10.1088/1054-660x/23/5/055802

Cited by 7 publications

(5 citation statements)

References 13 publications

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“…一样，系统储能效率和激光输出能力不可避免受放大自发辐射(ASE)和寄生振荡(PO)的影响 [5][6] 。包括掺钕激光玻璃、 Yb:YAG 晶体、钛宝石晶体等增益介质内的 ASE 和 PO 产生的机理已被广泛讨论分析 [7][8][9][10][11][12] 。为抑制激光放大介质内的 ASE 和 PO，科学家们研究并发展了高低温烧结包边、液体包边、斜边设计、涂覆包边、聚合物粘接等包边技术 [13][14][15][16][17][18][19][20][21][22][23] 。目前，对于片状掺钕磷酸盐激光玻璃，主要采用聚合物粘接包边技术 [22][23] ，即在片状掺钕激光玻璃四周用聚合物粘接一层吸收 ASE 和 PO 的包边玻璃。相对于烧结涂覆等包边技术，其具有易于实现，成本低等优点。在设计时，需要综合考虑折射率匹配、吸收材料选择、包边粘接强度、包边粘接残余应力、包边温升和使用寿命等因素。其中包边粘接残余应力 (特别是通光口径范围内)要足够小 [如美国国家点火装置 (NIF)使用的钕玻璃包边完成后通光口径范围内应力双折射要求小于 5 nm/cm]，一方面是应力过大会造成粘接过程中…”

Section: -unclassified

Experiment Investigation on Residual Stress of Nd:Glass Edge Cladding

Junjiang¹,

Tao²,

Lei³

et al. 2015

中国激光

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In order to decrease the reflectivity of amplified spontaneous emission, suppress parasitic oscillations, an edge cladding that absorbs the reflected or scattered light is required. The residual stress of the edge cladding is an important parameter for bonding. The influence factors on the residual stress birefringence near the bonding interface are described in detail. The effects of fine annealing, polishing and bonding are investigated. The results indicate that the effects of the edge stress of samples on the residual stress near the bonded interface are in evidence; the poorer of polishing surface flatness makes, the larger birefringence near the cladding interface; and the low shrink percentage and modulus adhesive polymer have less impact for the residual stress near the interface.

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Section: -unclassified

Experiment Investigation on Residual Stress of Nd:Glass Edge Cladding

Junjiang¹,

Tao²,

Lei³

et al. 2015

中国激光

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“…To overcome this damage, edge cladding technology applied to Nd glass plates is required. Several edge coating methods [12][13][14], such as liquid edge coating [15], mixed polymer glass edge coating [16], sealing edge coating [17], and so on, have been developed.…”

Section: Introductionmentioning

confidence: 99%

Study on surface modification and optical properties of Nd-doped phosphate glass

Kong

Jia

Sun

et al. 2023

J. Phys.: Conf. Ser.

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Using laser neodymium glass (N31) as the substrate, through ion exchange and hydrogen reduction process, a high-efficiency light absorption layer was formed from the substrate around the glass. It has been discovered that increasing the ion exchange temperature and time enhanced the exchange depth of laser glass, but excessive temperature and prolonged time will lead to corrosion of laser glass. The experiment shows that the best exchange temperature is 460°C and the best exchange time is 720min. When the hydrogen pressure was 0.8MP, the reduction temperature was 480°C and the reduction time was 12000 min, the absorption rate of the sample at 1053nm was 95.8%.

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“…Regarding diverse laser systems with different laser media of different shape and size, the utilized laser media need respectively corresponding solutions of the edge-cladding process. The solutions include solder glass cladding [ 4 ] , liquid edge-cladding [ 5 ] , monolithic edge-cladding [ 6 ] , sealing edge-cladding [ 7 , 8 ] , fusing edge-cladding [ 9 ] , the leak method by processing the gain medium edge into an arris [ 10 , 11 ] , the inorganic edge-cladding structure based on hydroxide-catalysis bonding [ 12 , 13 ] and composite polymer-glass edge-cladding [ 14 – 16 ] .…”

Section: Introductionmentioning

confidence: 99%

Monolithic edge-cladding process for the elliptical disk of N31-type Nd-doped high-power laser glass

Chen

Qian

Chen

et al. 2022

High Pow Laser Sci Eng

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This paper investigates the monolithic edge-cladding process for the elliptical disk of N31-type Nd-doped phosphate laser glass, which will be utilized under liquid cooling conditions for high-power laser systems. The thermal stress, interface bubbles and residual reflectivity, which are due to high-temperature casting and bonding during the monolithic edge-cladding process, are simulated and determined. The applied mould is optimized to a rectangular cavity mould, and the casting temperature is optimized to 1000 • C. The resulting lower bubble density makes the mean residual reflectivity as low as 6.75 × 10 −5 , which is enough to suppress the amplified spontaneous emission generated in the Nd-glass disk, and the resulting maximum optical retardation is converged to 10.2-13.3 nm/cm, which is a favourable base for fine annealing to achieve the stress specification of less than or equal to 5 nm/cm. After fine annealing at the optimized 520 • C, the maximum optical retardation is as low as 4.8 nm/cm, and the minimum transmitted wavefront peak-to-valley value is 0.222 wavelength (632.8 nm). An N31 elliptical disk with the size of 194 mm × 102 mm × 40 mm can be successfully cladded by the optimized monolithic edge-cladding process, whose edge-cladded disk with the size of 200 mm × 108 mm × 40 mm can achieve laser gain one-third higher than that of an N21-type disk of the same size.

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Parasitic oscillation suppression in high-gain solid-state amplifiers

Cited by 7 publications

References 13 publications

Experiment Investigation on Residual Stress of Nd:Glass Edge Cladding

Experiment Investigation on Residual Stress of Nd:Glass Edge Cladding

Study on surface modification and optical properties of Nd-doped phosphate glass

Monolithic edge-cladding process for the elliptical disk of N31-type Nd-doped high-power laser glass

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