Flashlamp pumped tunable dye laser of ultra-narrow bandwidth

A flash lamp pumped dye laser with a ring cavity is injected with the light beam coming from a stabilized singlemode c.w. dye laser. The light emitted by the pulsed laser is analysed either by a Fabry Perot etalon, or by producing a Doppler-free two-photon transition. The bandwidth of the pulsed laser is identical to the one of the c.w. laser; but the pulsed light is shifted to higher frequency by an amount of a few MHz.     

Frequency-locked tunable LD laser with a broad bandwidth

Using lock-in amplifer and proportional, integral, and derivative (PID) electric circuit, the frequency of diode laser is stabilized on a highly mechanical stable Fabry-Perot (FP) cavity transmission peak. When the frequency locking system is on, the frequency tunable range of the laser is about 4 GHz around the D1 transition of Rb. The laser frequency tuning is implemented by scanning the FP cavity length. The fluctuation of frequency of the output laser is less than 1 MHz, and the drift of the center frequency is less than 1.5 MHz in 1.5 min. This system has great potential of the application in the experimental investigation of the interaction between light and atoms, especially, for the case of far off the atomic resonance.     

A narrow bandwidth,pulsed, ultra-violet dye laser

A simple, narrow bandwidth, dye laser using para-terphenyl and operating in the region 3350–3450 Å is described. The laser incorporates beam expansion at a grazing incidence diffraction grating and is pumped by a rare gas halide excimer laser. Output bandwidths as low as 0.012 Å have been obtained.     

腔内带圆形空心波导的可调谐窄带脉冲染料激光器

本文报道了一种腔内带圆形空心波导和掠入射光栅的可调谐窄带脉冲染料激光器;实验结果表明:该激光系统能获得基横模、窄频带和高效率的激光输出。文中对系统设计机理也进行了分析。     

Comb filter with independently tunable wavelength spacing and bandwidth using cascaded variable differential group delay elements

An all-optical comb filter with independently tunable wavelength spacing and bandwidth (BW) is proposed. Using three cascaded variable differential-group-delay elements, we demonstrate theoretically and experimentally the tunability of the comb filter with >10 dB sidelobe reduction by adjusting three elements. The wavelength spacing is determined by the first filter module, while the sidelobe suppression ratio and the BW are defined by the middle and the last one, respectively.     

A tunable,frequency-doubled,continuous-wave dye laser using ADA

A tunable, continuous-wave, frequency-doubled, rhodamine 6G dye laser has been developed using an ADA crystal placed in an astigmatic and coma compensated cavity. Generated UV powers of the order of 30mW cw in a single direction in gaussian form over the range 292–302 nm have been obtained by temperature phase matching, and with a 4.5 W pump. Power output is affected by thermal phase mismatching, and is ultimately limited by thermal lensing. Two scanning systems have been developed; a broadband arrangement of linewidth 0.02 nm continuously tunable over a range of 2 nm, and a narrowband system of linewidth 0.002 nm continuously tunable over a range of 1 nm. The laser has been used to detect the Rydberg states of Rb up to a principal quantum of n = 74.     

A phase-shifted linearly chirped fiber Bragg grating with tunable bandwidth

We demonstrate a new method to broaden and adjust the transmission bandwidth of a phase-shifted linearly chirped fiber Bragg grating (PS-LCFBG) after its fabrication. A movable thermal head is used to heat the PS-LCFBG at a small contact point. The original ultra-narrow transmission bandwidth of the PS-LCFBG can be broadened due to both the presence of the passband peak caused by the thermally-induced temporary phase shift and the passband caused by the thermally-induced local Bragg wavelength shift. The transmission bandwidth of the new passband peak can be adjusted by changing the position of the thermal head. The transmission bandwidth of the PS-LCFBG can be broadened from <10 pm to 0.16 nm, and can be tuned from 0.16 to 1.05 nm.     

A tunable,single mode,injection-locked flashlamp pumped dye laser

A tunable, very narrow bandwidth, flashpumped dye laser is described. Publse energies up to 50 mJ at a bandwidth of less than 30 MHz, and with a divergence of 0.4 mrad, are obtained. Spectral narrowing and tuning is achieved by injection locking of the pulsed laser to the radiation, of a tunable cw dye laser. The cavity is designed for single longitudinal and transverse mode operation, with a mode diameter large enough to fill the active medium. This work was supported in part by the Israel commission for Basic Research, and in part by a grant from the United States Israel Binational Science Foundation (BSF), Jerusalem, Israel.     

可调谐相对论磁控管调谐带宽的优化

在以10腔旭日结构为方案的可调谐相对论磁控管中,分析了热腔下对磁控管性能有重要影响的零模成分与模式隔离因素,结合零模成分的形成原因以及轴向频率分量对调谐范围的影响,提出了调整大、小腔等效阻抗和体积,开放阳极端面,从而减小零模分量及增加调谐带宽的措施。CST模拟表明,通过这些优化,可调谐相对论磁控管的调谐带宽从最初的380 MHz提高到900 MHz。     

A novel 852-nm tunable fiber laser

We report a novel fiber laser operating at 850-nm band by using semiconductor optical amplifier and fiber grating. The laser system is stable, compact, and the operating wavelength can be tuned continuously from about 851 to 854 nm for Cs atomic clock system by stretching the fiber grating. An output power up to 20 mW is obtained with a signal-to-background ratio beyond 20 dB.     

A tunable frequency stabilized Ar+ laser

The frequency of a single-mode Ar⁺ laser atv=582 THz (=515 nm) is stabilized by means of an external iodine cell to a Doppler broadened absorption profile. The —unmodulated — stabilized laser frequency is reproducible to ±1 MHz or ±1.5×10^–9 v and can be shifted within a 180 MHz wide range.     

A powerful broad band tunable dye laser

Perchloric acid solutions of 4 methylumbelliferone pumped by a second harmonic of ruby provide a high efficiency (20% conversion yield of pumping source) broad band (5600-4600 Å) tunable dye laser. Some effects of chemical quenching on the efficiency of this protonic exciplex laser were investigated.     

A tunable,frequency-doubled cw dye laser using an RDP crystal

We report a c.w. intracavity, frequency doubled, rhodamine B dye laser using an RDP crystal 5 cm long. Generated uv powers up to 15 mW are obtained in a single direction with a linewidth of 2 GHz over the range 314–318 nm. A conversion efficiency of about 1.25 × 10^-3 W^-1 is measured.     

A wide bandwidth,high power laser source for plasma interaction studies

Wide spectral emission (50 Å FWHM) from a resonator comprising two Nd doped glass rods in the same cavity has been obtained. The realization is mainly devoted to the study of parametric instabilities in laser plasmas. Further developments and applications are discussed.     

窄带集成声光可调谐滤波器的研制

利用模式耦合理论分析了声光模式转换,并对声光可调谐滤波器的滤波带宽、调谐范围、驱动功率等性能参数进行分析计算。设计并制作出窄带集成声光可调谐滤波器(IAOTF)样品,搭建相应的IAOTF测试平台,得到中心波长在1.55μm,滤波带宽达到0.85 nm,波长调谐范围达到80 nm,驱动功率低于40mW的IAOTF。并对进一步压缩滤波带宽和旁瓣效应提出了解决途径。     

可调谐相对论磁控管调谐带宽的优化

 在以10腔旭日结构为方案的可调谐相对论磁控管中,分析了热腔下对磁控管性能有重要影响的零模成分与模式隔离因素,结合零模成分的形成原因以及轴向频率分量对调谐范围的影响,提出了调整大、小腔等效阻抗和体积,开放阳极端面,从而减小零模分量及增加调谐带宽的措施。CST模拟表明,通过这些优化,可调谐相对论磁控管的调谐带宽从最初的380 MHz提高到900 MHz。     

钾原子532nm可调谐超窄带光学滤波器的研究

对钾原子（4P1/2→4S1/2）态532nm 可调谐超窄带光学滤波器（T-ESFADOF）进行了理论和实验研究，建立了外电场中T-ESFADOF的理论模型，编程计算了T-ESFADOF透射谱，实验测得不同电场强度下T-ESFADOF透射谱，给出T-ESFADOF透射谱中心频率频移量随电场变化的分布曲线，并于理论计算曲线进行了比较. 关键词： 钾 线芯透射 可调谐超窄带滤波     

A 657-nm narrow bandwidth interference filter-stabilized diode laser

We present a 657-nm external cavity diode laser (ECDL) system,where the output frequency is stabilized by a narrow-band high transmission interference filter.This novel diode laser system emits laser with an instantaneous linewidth of 7 kHz and a broadened linewidth of 432 kHz.     

高速宽波长范围可调谐光纤激光器

研制了一台高速波长连续扫描光纤激光器。使用SOA作为增益介质,用高速可调谐法珀滤波器作为波长调谐器件,构成的环形腔激光器。测量结果表明,激光器的平均输出功率2.6mW,波长扫描范围40nm,波长扫描范围内功率波动范围小于±0.4dBm,线宽小于0.01nm,扫描速度达到2kHz。     

A tunable and single-longitudinal-mode Ho:YLF laser

A 1.94 μm Tm-doped fiber laser pumped tunable single-longitudinal-mode Ho:YLF laser with double etalons was reported for the first time. The maximum single-longitudinal-mode output power of 345 mW at 2051.6 nm was achieved at the absorbed pump power of 11.9 W, corresponding to a slope efficiency of 5.5% and an optical conversion efficiency of 2.9%. By regulating the angle of the F–P etalons, the output wavelength of the laser can be tuned from 2051.6 nm to 2063.3 nm. The single-longitude-mode Ho:YLF laser operating at 2 μm can be used as the seed laser source of coherent Doppler lidar, differential absorption lidar and so on.