半导体可饱和吸收镜启动克尔透镜锁模机理的实验研究

对采用腔内新型宽带半导体可饱和吸收镜(SESAM)掺钛蓝宝石激光器中的启动克尔透镜锁摸(KLM)的机理进行了实验研究.讨论了SESAM在阻挡-恢复过程中,启动锁模时间与其他因素的关系.获得了SESAM启动KLM过程较为完整的物理图像,并对其机理进行了分析和讨论.     

用腔内半导体可饱和吸收镜钛宝石激光器中自锁模状态的实验研究

用可饱和吸收体镜(SESAM)的掺钛蓝宝石激光器能够稳定运转在三种不同的锁模状态,即可饱和吸收体被动锁模、孤子锁模加被动锁模和KLM锁模.分析了三种自锁模的机理和SESAM的作用.对SESAM实现KLM锁模的自启动机制进行了实验观察和讨论.从该激光器的KLM锁模状态,获得了小于18飞秒的锁模脉冲序列. 关键词： 半导体可饱和吸收镜 自锁模 钛宝石激光器     

自启动KLM钛宝石激光器谐振腔的理论计算

运用四阶RungeKutta法直接求解非线性介质内椭圆高斯光束传播方程组的方法分析增益介质内的克尔透镜(Kerrlens)效应,结合在增益介质外运用的线性ABCD矩阵寻找自洽解,对半导体可饱和吸收镜(SESAM)启动的高功率KLM钛宝石激光器谐振腔的像散、稳定性、光束参数、自聚焦效应和克尔自聚焦强度与腔参数的关系进行了系统的理论计算.计算结果与实验结果相符合.该计算为SESAM启动的五镜腔KLM激光器的设计和调整提供了理论依据 关键词： 克尔透镜锁模 飞秒 半导体可饱和吸收镜 五镜腔     

含负克尔效应半导体可饱和吸收镜的五镜腔飞秒钛宝石激光器的理论分析

基于半导体可饱和吸收镜(SESAM)的负克尔效应，对含SESAM的五镜腔进行了理论计算和分析.结果表明，由于SESAM的负克尔效应，与没有SESAM的相比，锁模激光器的稳区在上稳区的内边缘有明显扩展，这使得激光器锁模启动的工作点更加靠近直流运转时的稳区边缘，从而获得更大的非线性因子.这说明SESAM的可饱和吸收机理具有锁模自启动效应外，其负克尔效应也有助于锁模的自启动. 关键词： 半导体可饱和吸收镜 负克尔效应 五镜腔     

半导体可饱和吸收镜实现固体激光器皮秒锁模的机理研究

对半导体可饱和吸收镜(SESAM)实现固体激光器皮秒锁模的机理进行了研究。通过对染料锁模介质和SESAM的结构对比,对SESAM皮秒锁模机理提出了一个新的解释。其在锁模激光器中充当锁模器件时,不仅仅是一个吸收体,同时也是一个增益介质。当腔内增益和损耗保持平衡时实现稳定的连续锁模。     

10kHz腔倒空锁模皮秒激光器研究

将半导体可饱和吸收体(SESAM)锁模技术与腔倒空技术结合,采用半导体端面抽运方式实现了具有高重复频率、大单脉冲能量的皮秒激光器的运转.从理论上分析了腔倒空锁模输出的机理,建立起腔倒空锁模激光器运行的物理图像,并对影响激光器倒空率的一些因素进行了研究.实验上,实现端面抽运Nd:YVO4晶体的SESAM连续锁模后,在锁模...     

半导体可饱和吸收镜被动锁模侧面抽运Nd:YAG激光器研究

利用半导体可饱和吸收镜(SESAM)锁模技术实现的超快脉冲激光器具有结构简单紧凑、脉冲序列稳定等优势,在许多领域有着重要用途,自问世以来受到国内外的广泛关注.分析了SESAM被动锁模侧面抽运固体激光器的具体要求,进行了不同条件下的SESAM被动锁模侧面抽运Nd:YAG激光器实验.获得了最高平均功率9.5 W,脉冲重复频率71 MHz,单脉冲能量约141 nJ的皮秒激光脉冲.对SESAM被动锁模侧面抽运Nd:YAG激光器进行了实验和理论分析,对实现高功率连续超短脉冲激光器进行了探讨.     

SESAM实现Nd:YAG激光器被动锁模研究及皮秒脉冲测量

分析了1.06 μm半导体可饱和吸收镜(SESAM)结构及被动锁模基本原理,利用SESAM实现了脉冲式Nd:YAG激光器1.06μm激光的被动锁模,获得了稳定的皮秒激光脉冲序列输出,脉冲序列的能量为45mJ.实验上还研究了腔长对SESAM锁模效果的影响.提出一种基于迈克耳逊干涉仪的皮秒光脉冲测量方法--二次谐波自相关单次测量法,分析这种测量方法的原理并构建实验装置对SESAM被动锁模Nd:YAG激光器的皮秒激光脉冲进行测量,测得激光脉冲宽度为43.6 ps.二次谐波单次测量法具有精度较高,操作简单等优点.     

采用半导体可饱和吸收镜的自启动、自锁模掺钛蓝宝石激光器

采用一种新型的宽带可饱和吸收体镜 (SESAM) ,在国内首次实现了自锁模掺钛蓝宝石激光器的自启动运转 ,锁模脉冲宽度小于 18fs,并对其动力学过程进行了研究。     

利用SBR实现自启动锁模钛宝石飞秒激光脉冲的产生

利用国内生长的低损耗双量子阱结构的可饱和布拉格反射器在掺钛蓝宝石激光器中实现了可饱和吸收体被动锁模、孤子锁模和KLM锁模状态的自启动稳定运转.当抽运功率为4.5W时，用啁啾镜进行色散补偿，获得了18fs的KLM锁模脉冲，输出功率为150mW. 关键词： 可饱和布拉格反射器 啁啾镜 飞秒 钛宝石激光器     

Self-starting five optical cycle pulse generation in Cr<Superscript>4+</Superscript>:YAG laser

We report stable self-starting near-transform-limited 26-fs pulses at 250-mW output power from a Kerr-lens mode-locked (KLM) Cr⁴⁺:YAG laser using chirped mirrors in combination with prisms. The highest output power achieved in KLM regime was 600 mW at 55-fs pulse duration. The experimental results agree well with the results of theoretical analysis with respect to KLM self-starting ability and stability against continuous-wave and multi-pulse operation. Parameter ranges for stable transform-limited KLM pulses as well as the shortest achievable pulse durations are established. Using an InGaAs-InP semiconductor saturable absorber mirror we could obtain self-starting 57-fs pulses at the average output power of 200 mW. Two-photon absorption was found to be the main mechanism favoring the multiple-pulse operation. Received: 2 May 2002 / Revised version: 16 July 2002 / Published online: 8 January 2003 RID="*" ID="*"Corresponding author. Fax: +43-1/58801-38799, E-mail: sorokina@tuwien.ac.at     

A diode-pumped, self-starting, all-solid-state self-mode-locked Cr:LiSGAF laser

In this paper, a self-starting, diode-pumped self-mode-locked Cr:LiSGAF laser, which produced a stable pulse train of 45 fs duration with about 20 mW-average power at the repeated rate of 90 MHz, was presented. Self-mode-locked operation can be obtained whether there is the semiconductor saturable absorber mirror (SESAM) in the Cr:LiSGAF laser cavity or not, and with the SESAM in the cavity, the self-mode-locked operation could self-start. The shortest pulses, as short as 38 fs, which were not very stable, were obtain with the SESAM in the cavity.     

用于钛宝石激光器自启动锁模的半导体可饱和吸收镜

报道国内首次制作的宽带低损耗半导体可饱和吸收镜（SESAM）。该反射镜已经成功用于钛宝石飞秒脉冲激光器的自启动锁模运转。     

Self-starting mode-locked femtosecond forsterite laser with a semiconductor saturable-absorber mirror

We report on a self-starting mode-locked femtosecond Cr:forsterite laser pumped by a diode-pumped Nd:YVO(4) laser. The mode locking is initiated by a semiconductor saturable-absorber mirror (SESAM). We also present the measured group delay of the forsterite crystal and the SESAM.     

Broadband semiconductor saturable-absorber mirror for a self-starting mode-locked Cr:forsterite laser

We report a low-loss broadband semiconductor saturable-absorber mirror (SESAM) that uses gold film as the reflector. A semiconductor- SiO(2) double-layer stack enhances the reflectivity of the gold film. This low-loss SESAM was used in a mode-locked Cr:forsterite laser to produce self-starting 20-fs-scale laser pulses at 1.3 microm . The structure can be applied to SESAM's for other wavelengths.     

Switchable dual-wavelength passively mode-locked fiber ring laser using SESAM and cascaded fiber Bragg gratings

We propose and demonstrate an efficient and simple wavelength switchable dual-wavelength passively mode-locked fiber ring laser based on a semiconductor saturable absorber mirror (SESAM) and a cascaded sequence of fiber Bragg gratings (FBGs). The efficient self-starting mode-locked operation was realized with a SESAM. Dual-wavelength pulses with a wavelength spacing of 12.49 nm were obtained which was determined by the reflection peaks of the FBGs used in the experiment. In addition, by rotating the polarization controllers (PCs), the switchable dual-wavelength operation was simply achieved via exploiting wavelength-dependent loss mechanism.     

Fluoride semiconductor saturable-absorber mirror for ultrashort pulse generation

We demonstrate what is to our knowledge the first ultrabroadband monolithically grown AlGaAs/CaF(2) semiconductor saturable-absorber mirror (SESAM) that covers nearly the entire gain spectrum of a Ti:sapphire laser. A large high-reflectivity bandwidth of more than 300 nm is provided by a device consisting of only six material layers. This fluoride SESAM had a modulation depth of 2.2%, a fast recovery time constant of less than 150 fs, and a slow recovery time constant of 1.2 ps. Using this SESAM inside a Ti:sapphire laser produced self-starting sub-10-femtosecond pulses.     

Femtosecond Er doped fiber laser using high modulation depth SESAM based on metal/dielectric hybrid mirror

We proposed and fabricated a metal/dielectric mirror based high modulation depth semiconductor saturable absorber mirror (SESAM), for ease of the growth restrictions. Using such a SESAM, we obtained self-starting mode-locking in a ring cavity fiber laser, which produced 102 fs pulses at a repetition rate of 36.2 MHz.     

Inverstigation of Self-Starting for Self-Mode-Locked Ti:Sapphire Laser

ＩｎｖｅｒｓｔｉｇａｔｉｏｎｏｆＳｅｌｆ－ＳｔａｒｔｉｎｇｆｏｒＳｅｌｆ－Ｍｏｄｅ－ＬｏｃｋｅｄＴｉ：ＳａｐｐｈｉｒｅＬａｓｅｒＩｎｖｅｒｓｔｉｇａｔｉｏｎｏｆＳｅｌｆ－ＳｔａｒｔｉｎｇｆｏｒＳｅｌｆ－Ｍｏｄｅ－ＬｏｃｋｅｄＴｉ：ＳａｐｐｈｉｒｅＬａ...