共查询到20条相似文献,搜索用时 78 毫秒
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朝阳 《激光与光电子学进展》2007,44(12):10-10
自锁模激光腔不需要附加半导体饱和吸收镜(SESAMs)等主动和被动锁模器件,完全靠激光材料的光学和热效应达到锁模。与克尔镜锁模相比,自锁模对激光腔的排列不敏感,锁模区较长。最近第一台高功率自锁模Yb:Y2O3模陶瓷激光器研制成功。该激光器结构简单紧凑,激光腔只使用了3个反射镜和一个陶瓷棒。 相似文献
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介绍了当前国际上流行的用半导体可饱和吸收镜来对固体激光器、光纤激光器和半导体激光器进行被动锁模的方法,阐述了半导体可饱和吸收镜用来作为被动锁模吸收体的原理,并介绍了如何利用金属有机气相淀积(MOCVD)技术生长各种波长激光器所需要的半导体可饱和吸收镜。 相似文献
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半导体可饱和吸收镜实现高频脉冲激光研究进展 总被引:1,自引:1,他引:0
介绍了作为固体激光器、半导体激光器和光纤激光器被动锁模吸收体的半导体可饱和吸收镜(SESAM)的基本原理和制作方法。详细阐述了利用半导体可饱和吸收镜对同体激光器和光泵垂直外腔面发射半导体激光器进行被动锁模,获得重复率为几吉赫到几百吉赫的超短脉冲激光的方法。 相似文献
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Young Ahn Leem Dae-Su Yee E. Sim Sung-Bock Kim Dong Churl Kim Kyung Hyun Park 《Photonics Technology Letters, IEEE》2006,18(4):622-624
A novel self-pulsation regime is observed in multisection laser diodes which consist of a loss-coupled distributed-feedback (DFB) section, a phase control section, and gain sections, where 10-GHz self-pulsation due to compound cavity mode beating has been reported with the DFB section operated as a single-mode laser. When the DFB section is below threshold current, the devices give the self-pulsation in a very wide operating range. We attribute the pulsation to passive mode-locking and also confirm that this structure is applicable to 40-GHz operation. 相似文献
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Mos E.C. 't Hooft G.W. Schleipen J.J.H.B. de Waardt H. 《Quantum Electronics, IEEE Journal of》2001,37(7):911-918
Chaotic self-pulsation in a single wavelength external-cavity laser diode is observed. It is shown that the self-pulsation is caused by interdependencies between the optical output power and the compound cavity losses through the refractive index of the laser diode material. Refractive index changes result in a detuning between the externally selected wavelength and the weak internal-mode structure of the anti-reflection coated laser diode. This detuning is directly related to the compound cavity losses. On the one hand, a change in optical output power results in a change of the refractive index via the carrier density. On the other hand, it results in a change of refractive index via temperature changes. Compared to the carrier induced refractive index change, the temperature induced refractive index change is opposite in sign, a factor of ~102 smaller and slower. The switch-on and switch-off time of the self-pulsation is governed by the carrier life time. The repetition rate of the self-pulsation is governed by the thermal time constant and is in the megahertz region. Cross-modulation resulting from the thermal induced refractive index change is demonstrated. In a two-wavelength double external-cavity laser diode, optical power at one wavelength effects the optical power at the other wavelength. This cross-modulation is shown to be related to previous experiments on a laser neural network. A novel technique is introduced to measure the thermal impedance of a laser diode that is based on the cross-modulation 相似文献
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Zhigang Zhang Torizuka K. Itatani T. Kobayashi K. Sugaya T. Nakagawa T. 《Quantum Electronics, IEEE Journal of》1997,33(11):1975-1981
We studied a mode-locked Cr:forsterite laser pumped by a diode pumped Nd:YVO4 laser. Both the Kerr lens mode locking and the semiconductor saturable absorber initiated mode locking have been demonstrated. Using our measured dispersion data of the forsterite crystal, together with our dispersion compensation technique, we obtained 20-fs pulses for the pure Kerr lens mode locking and 36-fs pulses for semiconductor saturable absorber initiated mode locking, respectively 相似文献
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《Microwave Theory and Techniques》1978,26(2):62-69
A theory of mode locking in the microwave regime is presented. The use of solid-state microwave devices for this application is described. A system that has been built using an IMPATT diode as the gain element and a Schottky barrier diode in the role of a saturable absorber is analyzed. Passive, combined passive, and forced mode locking have been demonstrated experimentally. The system had a round-trip time of 25 or 50 ns. Pulse lengths between 4 and 15 ns were observed. Self-starting and stability requirements are investigated. 相似文献
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Byoung-Sung Kim Younchul Chung Sen-Ho Kim 《Quantum Electronics, IEEE Journal of》1999,35(11):1623-1629
A mode-locked sampled-grating distributed-Bragg-reflector (SGDBR) laser diode for generating a train of light pulses at terahertz repetition rates is proposed with a numerical analysis based on a time-domain large-signal model. The device consists of three parts: the saturable absorber section which serves as a mode-locker, the gain section as an amplifier, and the SGDBR as a spectrum filter. It is predicted that spectrum filtering of the SGDBR along with passive mode locking due to the saturable absorber is effective in generating a train of transform-limited mode-locked pulses at a high repetition rate 相似文献
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Dae-Su Yee Young Ahn Leem Sang-Taek Kim Kyung Hyun Park Boo-Gyoun Kim 《Quantum Electronics, IEEE Journal of》2007,43(11):1095-1103
Monolithic self-pulsating semiconductor lasers called amplified feedback lasers (AFLs) can generate high-frequency self-pulsations according to the concept of a single-mode laser with shortly delayed optical feedback, which consist of a distributed-feedback (DFB) laser, a phase control, and an amplifier section. Since mode degeneracy of the DFB section, which should operate as a single-mode laser, affects the self-pulsation, single-mode characteristics of the DFB section are critical for the self-pulsation. The effect of a complex coupling in the DFB section on the self-pulsation is numerically analyzed to reveal that the complex coupling provides a wide operation range for the self-pulsation. Also, self-pulsating AFLs based on a loss-coupled DFB laser are experimentally demonstrated to verify the self-pulsation characteristics and the capability for all-optical clock recovery. 相似文献
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A. Kaszubowska L.P. Barry P. Anandarajah 《Photonics Technology Letters, IEEE》2003,15(6):852-854
A self-pulsating laser is used to generate a multicarrier (five radio frequency (RF) channels) microwave optical signal for use in a hybrid radio/fiber system. The self-pulsation is achieved by external light injection into the laser diode. By varying the RF channel spacing, we have been able to estimate the degradation in system performance due to intermodulation distortion (caused by the nonlinear dynamic response of the laser). The power penalty on the central RF channel is found to be 3.2 dB for operation at the RF band around the laser self-pulsation frequency of 18.5 GHz. We have also characterized the performance of the multicarrier hybrid radio/fiber system in the frequency band corresponding to the inherent relaxation frequency of the laser. 相似文献
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Yu N. Defreez R.K. Bossert D.J. Elliott R.A. Winful H.G. Welch D.F. 《Electronics letters》1988,24(19):1203-1204
The time evolution of the near-field radiation patterns of CW operated inphase locked flared `Y' coupled diode laser arrays has been observed with a streak camera. The arrays exhibit sustained self-pulsation at frequencies as high as 4 GHz 相似文献