Understanding spectrally controlled interferometry - Laser Focus …
2023年7月13日 · The helium neon (HeNe) laser’s long temporal and spatial coherence enabled simple Fizeau interferometers to be viable and easy to use. The laser diode and scanning laser diodes introduced new methods of acquiring data, but little else.
You will use the Michelson interferometer to observe the interference of two light sources: a HeNe laser and a sodium lamp. You will study interference patterns quantitatively to determine the wavelengths and splitting of the Na D lines empirically. You will use the HeNe laser interference spectrum to calibrate the interferometer.
When a lens is placed between the laser source and the beam-splitter, the light ray spreads out. An interference pattern of dark and bright rings, or fringes, is seen on the viewing screen, as shown in Figure 2. This spreads out the beam and makes it easier to see the interference.
We will now use this interferometer to measure the wavelength of two different light source, beginning with the HeNe laser already installed. After obtaining the interference pattern, note down the reading 0 of the fine micrometer (part # 10).
A new approach to removing interference of moisture
2022年1月15日 · An approach is developed to remove the interference of moisture from FTIR spectra. The interference arises from two aspects: the fluctuation on the temperature of the HeNe laser and the fluctuation on the transient concentration of moisture in the light - …
He–Ne laser wavelength-shifting interferometry - ScienceDirect
2010年12月15日 · In this paper we briefly review the principles of wavelength-shifting interferometry, describe the particulars related to the use of a He–Ne laser during the warm-up time, and present the results of a measurement compared to the classical phase-shifting approach with piezoelectric actuators. 2. Wavelength-shifting interferometry principle.
Design for a highly anti-interference He-Ne laser with novel …
2022年12月1日 · Thermal frequency–stabilized He–Ne lasers are developed based on the characteristics of thermal expansion by controlling the temperature of the resonant cavity to achieve closed-loop adjustment of laser frequency. Commercial He–Ne lasers exhibit different characteristics in heaters, heat dissipation modes and structures.
The Helium-Neon Laser, short HeNe-Laser, is one of the most common used laser for allignement, reference laser and optics demonstrations. Its most used wavelength is at 632.8nm (red).
HeNe双频激光器频差的激光内雕赋值法 - 物理学报
In the field of precision measurement, HeNe laser is the first choice for fabricating laser interferometer. But the frequency difference of Birefringence-Zeeman dual-frequency HeNe laser, which can produce a medium frequency difference of 440 MHz, is randomly from as small as hundreds of kHz to as large as a dozen of MHz.
6D30.35 - Thin Film Interference - HeNe Laser and Glass Plates or ...
Screw the lenses onto the laser for a large divergent beam. Point this at the angled plates. Observe the reflected patterns on a screen. The interference patterns can be altered by squeezing the plates together. NOTE: The optical flat is in 6D30.10 - Newtons Rings box.