Janusz Pienkowski

Ball screw inspection setup

In the following paper we describe arrangements of laser interferometer for investigation of screws and for inspection of ball screws. We have constructed two of them, namely: the technological setup for investigations of screw in process of production and the ball screw inspection setup. The former one is used to measure the pitch of screws. The data gathered during measurement is used to calculate the parameters for grinding machine. The later setup is used for testing parameters of complete ball screws. The software supporting this setup makes calculation of parameters of tested ball screw and creation of reports possible. Additionally, the inspection setup is the one that the torque measuring arrangements have been integrated on. Both the arrangements and the software allow for measurements of all parameters during movement of nut in full travel length of the ball screw and make charts and reports.

Frequency stabilized 633 nm diode laser

Construction of a simple single-frequency diode laser 632.8 nm, used as a frequency standard in the laser interferometers is demonstrated. Two different systems applied for frequency stabilization of diode laser were used . For diode laser used as the secondary standard, the system stabilizes diode temperature, the frequency stability of the laser reaches value 1 part in 106. For diode laser used as the primary standard is developed stabilization system using narrow absorption in iodine, the frequency stability of constructed diode laser reaches value 1 part in 1010 . The stabilization method can be used for another diode lasers with different wavelength using in fiber communications systems.

Interferometer systems in machine industry

In the report the arrangements of laser interferometers for machine history are presented; the laser interferometer LSP30 for investigation of geometry of machine tools, the setup for inspection of ball screw and laser liner for CNC machine. Outstanding feature of the interferometers is the stabilization system of laser frequency using surface stabilized ferroelectric liquid cells (SSFLC).

SSFLC Polarization Switch for Zeeman Laser Stabilization Loop

Abstract Ferroeleciric liquid crystals (FLC) as light modulators in the stabilization system of a Zeeman laser increase the quality of stabilization due to the high switching speed and make the whole system very compact. We analyze the operation of the optical part of such a stabilization system and derive optimum values of the FLC cell parameters. Properties of available liquid crystals and their temperature dependence are considered as well as, in particular, the influence of a slight ellipticily of the laser radiation.

Modelling of frequency stabilization of diode laser based on iodine absorption cell

The possibility of stabilization of diode lasers, lasers with a wider spectral line based on the iodine absorption cell, has been examined with a stabilization method of a 3 harmonic deviation. Possible stability levels, according to the width of diode lasers spectral line, have been checked. It has also been checked the change of the signal of the 3 harmonic in dependence with the frequency and depth of the modulation of the stabilized diode laser.

Investigations of 543-nm HeNe laser mode characteristics

The results of mode spectrum investigations of commercial internal mirrors 543 nm HeNe laser are presented in this paper. Measurements of the laser Zeeman frequency were done for 543 nm HeNe laser tube placed in longitudinal magnetic field. Obtained results were applied for frequency stabilization of 543 nm HeNe commercial laser.

I2 - saturated absorption at 543-nm HeNe laser with external absorption cell

The results of investigation of saturation spectrum of iodine 127I2 hyperfine transitions for 543 nm HeNe laser radiation are presented in paper. Commercially available internal mirror green HeNe laser tube emitting at 543.5 nm and short external absorption cell were used in investigations. The 19 absorption components were observed, the parameters of obtained components can be suitable for frequency stabilization of 543 nm HeNe laser.

Laser system for wavelength of laser interferometer calibration

The laser interferometers are intended for high-precision measurement of distances and displacements. The calibration equipment for the definition of real meaning of the laser radiation wavelength and investigation of wavelength stability and reproducibility of the laser radiation in the laser interferometers is presented in paper. The laser radiation frequency was measured with the heterodyne method using the developed laser frequency iodine standard 633 nm. The system was used for calibration the frequency of the He-Ne Zeeman laser used in the two frequency laser interferometer.

Laser system for angle and straightness measurements

The two frequency laser interferometer for the angle and straightness measurements is presented. The principles of the operation of this laser system is described. The system consists of the laser head, optical elements, meteo station and PC computer. The construction of the main elements of the system are discussed. The parameters of the angle and straightness measurements are presented and compared to the other systems.

Optimization of discrimination characteristics of two-frequency He-Ne lasers used in nanointerferometry

The influence of the magnetic field on Zeeman frequency of the He-Ne laser is presented in this paper. The new method of frequency stabilization of He-Ne laser is proposed. The optimization procedure for obtaining optimum discrimination curve of the He-Ne laser is described.