Polarization independent birefringent Fabry-Perot etalon having polarization conversion mirrors

Polarization independent operation of birefringent Fabry-Perot etalon is proposed using polarization conversion mirrors (PCMs) as the cavity mirrors. PCMs, such as Faraday mirrors, rotate the polarization plane by 90° upon reflection thus allowing the same phase accumulation for the two eigenwaves after a roundtrip inside the cavity. Based on that when the cavity is filled with an electrooptic material such as a liquid crystal, polarization independent tunable filtering is obtained.     

Thermal characteristics of a fiber Fabry-Perot etalon made of highly birefringent fiber

Fiber Fabry-Perot etalon (FFPE) is a device designed as an optical frequency filter, and its transmission characteristics change depending on temperature. The temperature dependence of the transmission frequency of an FFPE made of a highly birefringent fiber was found to be −2:31 GHz/deg, which is almost the same as that of a conventional etalon. On the contrary, its temperature dependence of the transmission frequency separation due to birefringence was found to be −140 MHz/deg. This is about 18 times larger than that for a conventional FFPE, and it implies that an FFPE made of highly birefringent fiber is promising as a temperature sensor with a high precision.     

Wedged etalon tuning for miniature and monolithic lasers

We present an architecture permitting broad tuning of monolithic microchip lasers by using a wedged etalon. Full tuning from 282 to 314 nm is demonstrated by using a miniature Ce:LiCAF laser design, where tuning is achieved by translating the entire Ce laser cavity relative to the pump beam. The application of this technique to a range of microchip lasers will lead to extremely robust tunable monolithic lasers.     

On electro-optical tuning of dye lasers

The method of electro-optical tuning is theoretically investigated using a four 45°X ADP crystal system. High tuning rates of /V=0.266 Å V^–1 are obtained by placing the crystals optically in series and electrically in parallel.Experimental results show agreement with theoretical expectations.     

Discretely tunable and multiwavelength erbium doped fibre lasers with Fabry-Perot etalon

Modern WDM telecommunication systems require stable and calibrated laser sources. In this paper, we present examples of such lasers based on erbium doped fibres, i.e., discretely tunable and multiwavelength ring lasers. For the first case, tuning is possible due to a tunable Bragg grating overlapping spectrally the third telecommunication window (1550 nm). When a Fabry-Perot etalon is inserted into the cavity, discrete tunable operation with appropriate spacing between operating wavelengths is possible. Different free spectral ranges (FSR) of applied etalons ensured operation at a wavelength spacing 0.4 nm, 0.8 nm or 1.6 nm, respectively. When an acoustooptical Bragg frequency shifter was inserted together with the Fabry-Perot etalon, the stable simultaneous multiwavelength operation covering the erbium doped gain range was achieved.     

Precise rf tuning for cw dye lasers

Laser beams are rf amplitude modulated to generate side frequencies which are used to tune a cw dye laser with rf accuracy. In a laser spectroscopic test experiment a precision of ±15kHz has been realized.     

A magnetic tuning system for dye lasers

A new device for magnetically displacing the output mirror of a laser resonator and synchronously tilting an etalon in order to obtain single-mode tuning of a dye laser over a tuning range of at least 10 GHz is described. Comparatively large displacements with good linearity of a coil mounted on a membrane and placed inside the strong magnetic field of a ring magnet are obtained for currents in the order of several hundred milliamperes. Together with etalon flats of appropriate thickness and reflection mounted in the resonator of the laser a versatile instrument for application in intra and extra cavity spectroscopy has been developed.     

Emission spectra of dye lasers which use acoustooptic tuning

Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 54, No. 5, pp. 763–767, May, 1991.     

Novel method for active mode-locking and tuning of dye lasers

A novel method of tuning an active mode-locking of dye lasers is described using a new type of interferometer. Preliminary results using a flashlamp-pumped dye laser demonstrate the capabilities of the method.     

Thermal stimulated radiation of a dissipative Fabry-Perot etalon

The contribution of stimulated coherent radiation to the total thermal radiation of a dissipative Fabry-Perot etalon is calculated and it is shown that for sufficiently high temperatures and a sufficiently highQ of the resonator the radiation of the Fabry-Perot etalon can be predominantly a stimulated one. On the basis of thermodynamic investigation, it has been found that for the conversion efficiency of thermal energy into the energy of stimulated radiation of a two-level system , whereT _eff is a parameter characterizing the total emissivity of the system at a given frequency and¯f is the mean value of the distribution function of the photons in a given spectrum interval.The author wishes to express his gratitude to Dr. M. Trlifaj and Dr. K. Pátek for stimulating discussions.     

Tuning properties of a birefringent Fabry-Pérot etalon

The tuning properties of the birefringent Fabry-Pérot etalon as a low-loss highfinesse frequency selecting element were examined. The analysis shows that continuous tuning is possible for a special orientation of the crystal; the tuning range is limited primarily by the dispersion of the crystal. Experimental results confirm theoretical predictions.     

Design considerations and analysis of velocity mismatch effects in an electrooptic Fabry-Perot modulator

The influence of velocity mismatch effects on the design and performance of an integrated optic Fabry-Perot travelling wave modulator fabricated in LiNbO₃ is studied analytically. It is shown that despite the velocity mismatch the performance of this system is significantly better than equivalent single pass systems.     

一种透过率随入射角近似线性变化的F-P标准具设计

为了由非机械扫描式F-P标准具的透过率得到来袭激光的入射角,设计了一种透过率随入射角近似线性变化的F-P标准具。把薄膜光学原理应用于F-P标准具的设计之中,考虑了斜入射条件下,特别是大入射角下,增透膜和干涉腔反射层特性参数变化对其透过率的影响,针对1.06μm激光,经过仿真设计,确定了F-P标准具主要参数。反射板选用K9玻璃,反射层采用单层ZnS膜时,腔长(475±5)nm,膜厚(65±5)nm,膜层垂直反射率20.7%～24.0%,对应标准具的透过率与入射角之间线性关系为T=-52.23θ+87.92,透过率非线性误差±5%;采用Ag膜时,腔长(460±10)nm,膜厚(3.80±0.15)nm,膜层垂直反射率22.4%～24.8%,T=-52.28θ+82.05,透过率非线性误差±4%。但具体的实现形式和制作工艺有待进一步研究。     

Intracavity LiNbO(3) Fabry-Perot etalon for frequency stabilization and tuning of a single-mode quasi-continuous-wave titanium:sapphire ring laser

We describe an intracavity LiNbO(3) Fabry-Perot etalon for frequency stabilization and tuning of a single-mode quasi-continuous-wave Ti:Al(2)O (3) ring laser. Taking into account the 150-micros pulse duration and the 40-Hz repetition rate of our laser, we achieve stabilization by 266-kHz modulation of 100-V peak-to-peak voltage applied to the electro-optic crystal. Tuning is ensured by the presence of a gain loop that contains a lock-in amplifier reacting with a multimorphous ceramic by means of 0-300-V dc voltage, which causes slight rotation of the LiNbO(3) Fabry-Perot etalon. A continuous frequency scan of 6 GHz was made that potentially can be extended to 6 cm(-1) .     

分析法布里-珀罗标准具成像不清晰现象

从干涉条纹的定域出发,定量的解释了法布里－珀罗标准具成像不清晰的原因。     

Waveguide dye lasers prepared by diffusion

Waveguide dye lasers are prepared by diffusion of dye molecules into a commercial foil. Superradiance is achieved with Rhodamin 6 G, Rhodamin B and a mixture of Rhodamin 6 G and Cresylviolet.     

Two kinds of novel birefringent dual-frequency lasers

Two kinds of novel dual-frequency He–Ne lasers are presented and described in this paper based on the birefringent laser frequency splitting technology: the full-inner cavity photoelastic dual-frequency laser and the half-inner cavity photoelastic dual-frequency laser. The frequency difference between the two kinds of dual-frequency laser can be adjusted from tens to hundreds of megahertz through adjusting the mechanical pressure exerted on the photoelastic element. The stability of the frequency differences of the two lasers are 10⁻³ and 10⁻⁵, respectively, after the lasers are turned on for a while.     

Design of wavelength adjustable lasers with photonic crystal based Fabry-Perot etalon for applications in optical network units of wavelength-division-multiplexed passive optical network systems

We propose a novel wavelength adjustable laser (WAL) with a photonic crystal based Fabry-Perot (FP) etalon. This laser will be a promising light source for optical network units (ONUs) of conventional wavelength-division-multiplexed passive optical network (WDM-PON) systems for up-stream transmission. It has the merits of a relatively simple fabrication and operation, wide process tolerance, low-cost, high side-mode suppression ratio, and wavelength-tunable characteristics. The optimization of the device structure and the implementation methods for this type of laser are discussed. Although the WALs in WDM-PON systems are not colorless, each laser can cover several wavelengths. Thus, the required number of different ONUs can be reduced. This approach may be necessary for 10 Gbps upstream transmission in next-generation optical access networks because the 10 Gbps data rate is difficult to achieve by using current colorless schemes.