Spatial hole burning and oligo-mode distance control in CW dye lasers

Spatial hole burning at the position of the dye cell is identified to be responsible for stable double-, triple-, and higher oligo-mode action in a narrow-band CW dye laser. This may be exploited systematically to control the mode distances by arranging the positions of both resonator end mirrors. A total output power up to over 100 mW is obtainable for double- or triple-mode action. Special conditions are described to obtain stable double-mode action with 1772-MHz mode spacing, as needed for simultaneous optical pumping of the two sodium hyperfine ground states.     

A simple passively mode-locked CW dye laser

The operation of a simple passively mode-locked 5800-Å dye laser is reported. A single active medium, solution of rhodamine 6 G and diethyloxadicarbocyanine iodide (DODCI) in glycol flowing as an unconfined liquid film, is used for the simultaneous production of gain and non-linear absorption.     

High-efficiency tunable CW dye laser

An output power of 1 W is reported from a tunable CW dye laser pumped by 3.5 W of argon laser radiation. The nearly 30 percent conversion efficiency is achieved by using a very low-loss folded 3-mirror cavity and by pumping through a Brewster-angle dispersing prism.     

33-W CW dye laser

A continuous rhodamine 6G jet stream dye laser was pumped by a high-power multimode argon laser. Using water with a viscosity-raising additive as a solvent, no thermooptical problems arose up to the available pump power of 110 W. The maximum output power of the CW dye laser was 33 W at an efficiency of 30 percent.     

氩离子激光泵浦的连续染料激光器的研究

一、引言 有关连续染料激光器的专题文章,在国外已有很多报导。 由于连续染料激光器具有输出功率高(从几百毫瓦至几十瓦)、转换效率高(大于30％),可获得优于10~(-5)埃的窄线宽,光谱覆盖范围宽,而且能够连续调频、连续运转等特点,因此,当这一器件出现后很快就被用于高分辨激光光谱学和激光分离同位素等新兴的学科领域。在许多应用中最引人注目的例子是利用该器件首次成功地分离了铀、钙、氯以及多种稀土元素的同位素,并在无多普勒加     

Ultrasensitive response of a CW dye laser to selective extinction

The sensitivity of a broad-band dye laser to selective intracavity absorption is proportional to the number of oscillating modes. This result is obtained from a rate equation model, taking into account the spectral homogeneity, but spatial inhomogeneity of the laser saturation. An increase of absorption sensitivity by a factor of 10⁵, compared to a single-pass measurement, is observed in an experiment with an iodine vapor absorption cell inside the cavity of a CW dye laser. The fluorescence of an external iodine vapor cell provides a convenient selective absorption monitor.     

Tunable two-wavelength mode locking of the CW dye laser

Tunable model-locked laser output is achieved at two wavelengths with a CW dye laser containing a rhodamine 6G and a cresyl violet jet. Rhodamine 6G is pumped by a mode-locked argon laser. Output pulses of 4-5 ps duration are obtained.     

CW laser action in atomic fluorine

We have obtained CW laser action on four transitions in the doublet system of atomic fluorine for the first time. All previously reported laser action was on a pulsed basis only. CW laser radiation was obtained when F2or AgF was used as a fluorine donor in an electron beam pumped helium plasma. A multiline output power of 200 mW was obtained.     

Photon statistics of a CW dye laser with and without internal etalons

Measurements were made to determine the photocount statistics and photocount correlations of a CW dye laser operated with and without internal etalons to achieve narrow linewidth. In addition, estimates of the mean laser light intensity as a function of time were made from photocount count records and the use of a newly developed stochastic estimation procedure.     

Cavity length detuning characteristics of the synchronously mode-locked CW dye laser

We present both theoretical and experimental details on the effects of cavity length deturning of the synchronously mode-locked CW dye laser. The theory predicts an increase in cavity length sensitivity with intracavity bandwidth, and an asymmetric variation in the pulsewidth and pulse power with length detuning from the "matched" position. The predictions are shown to be in close agreement with the results of our experiments on the Rhodamine 6G dye laser.     

Cross-correlation studies of pulses from the double mode-locked CW dye laser

A detailed investigation of the dual-wavelength pulse trains from the double mode-locked CW dye laser is made using cross-correlation measurements. Direct displays of pulse shapes and of the system jitter distribution are experimentally determined on a picosecond time scale. Techniques for determining the relative time of generation between the two double mode-locked pulse trains are also demonstrated. A variety of operating modes for this system is discussed in detail, providing further insight into the fundamental mechanisms involved in the production of the two pulse trains.     

CW submillimeter laser action in ethyl chloride

We present ten new far-infrared (FIR) laser lines obtained by optically pumping ethyl chloride by means of a CW waveguide CO₂ laser with a tunability range of 300 MHz. By means of a heterodyne technique and using, as mixing element, a metal-insulator-metal (MIM) point contact diode or a new home built metal-semiconductor diode, we measured the frequency of all these new lines, as well as that of another line, previously reported in literature. With our new lines, the total number of FIR laser lines emitted by ethyl chloride rises to 14; for each of them we give the offset relative to the center frequency of the pumping radiation, the polarization relative to that of the pumping CO₂ laser, the relative intensity, and the optimum operation pressure. Seven of the new lines have frequencies in the 300-512-GHz range and four of them are strong enough to be used in high-field EPR spectroscopy     

使用有源辅助外腔的连续波染料激光的倍频方法

本文分析了使用有源辅助外腔提高连续波染料激光倍频效率的可能性,分析结果表明,使用这种技术可得到较无源辅助外腔高一个数量级的紫外线能量输出。     

Operation of an infrared dye laser synchronously pumped by a mode-locked CW Nd:YAG laser

Infrared dyes emitting around 1.3 μm exhibit fluorescence lifetimes τflof only ∼ 10 ps which are shorter than the duration of the pump pulses (t_{p} sim70ps). This fact results in performance characteristics different from those of visible dye lasers where the fluorescence lifetime is longer than tp. The pulse properties of IR dye lasers are investigated for various bandwidth-limiting elements. The generation of nearly transform-limited dye laser pulses as short as 6 ps-assuming a Gaussian temporal shape-is demonstrated.     

Influence of spatial hole burning on the output power of a CW dye ring laser

The output power of a single-mode CW dye ring laser can be enhanced by 50 percent by changing over from standing-wave (SW) operation to traveling-wave (TW) operation. This effect is attributed to smoothing out the SW pattern in the active medium, which gives rise to spatial inhomogeneities of the inversion.     

Frequency-locking of a CW dye laser to absorption lines of neon by a Faraday filter

Single-mode CW oscillations at absorption lines of neon from the1sstates to the2pstates were achieved by inserting a Faraday filter in an argon-laser-pumped dye laser cavity without any other wavelength selective elements. The oscillations at absorption lines were selected by choosing adequate values of the filling pressure of a neon discharge tube and a magnetic field strength. The oscillation frequency shifted with the increase of the magnetic field strength toward higher frequency in the center region and toward lower frequency on the wing of the absorption line, which was found to be due to the isotope effect. Good agreement was found between the experimental results and the theoretically calculated feature of the Faraday filter.     

Frequency-locking of a CW dye laser to the center of the sodium D lines by a Faraday filter

Single-mode CW oscillations at the center of the sodiumDlines have been achieved by inserting a Faraday filter in an argon-laser-pumped dye laser cavity. The oscillations at the D1and D2lines can be selected by choosing adequate values of the sodium temperature and the magnetic field strength. Experimentally obtained conditions to get the single-mode oscillations at the center of theDlines are compared with the theoretically calculated feature of the Faraday filter, and a relatively good agreement has been found. The shifts of oscillation frequencies due to the magnetic field are also discussed.     

Ar~+泵浦连续波染料激光器谐振腔的设计与分析

本文叙述了三镜折迭腔和四镜环形腔的设计,着重分析了腔的调整对谐振腔的一些特性的影响.     

Single frequency CW dye laser operation in the 690-700 nm gap

We report studies of two new CW red laser dyes, one of which fills in the gap of 690-700 nm in present single frequency dye laser coverage.