Ultrastable laser array at 633 nm for real-time dimensional metrology

Abstract

Articles you may be interested inDeveloping a narrow-line laser spectrometer based on a tunable continuous-wave dye laser Rev. Sci. Instrum. 85, 083113 (2014); 10.1063/1.4893014 Frequency stabilization of transverse Zeeman He-Ne laser by means of model predictive control Rev. Sci. Instrum. 77, 123301 (2006); 10.1063/1.2400021Digital control of an iodine stabilized He-Ne laser by using a personal computer and a simple electronic system Rev. Sci. Instrum. 74, 3155 (2003);We describe a laser system for very-high-accuracy dimensional metrology. A sealed-cavity heliumneon laser is offset locked to an iodine-stabilized laser in order to realize a secondary standard with higher power and less phase noise. Synchronous averaging is employed to remove the effect of the frequency modulation present on the iodine-stabilized laser. Additional lasers are offset locked to the secondary standard for use in interferometry. All servo loops are implemented digitally. The offset-locked lasers have intrinsic linewidths of the order of 2.5 kHz and exhibit a rms deviation from the iodine-stabilized laser below 18 kHz. The amplitude noise is at the shot-noise limit for frequencies above 700 kHz. We describe and evaluate the system in detail, and include a discussion of the noise associated with various types of power supplies.

Design and evaluation of a simple ultralow vibration vacuum environment

“…It has been used to help evaluate laser frequency stability 14 and for various studies of Michelson and Fabry-Perot interferometers. It is capable of sustaining a rather heavy experimental apparatus with excellent performance.…”

“…13 Light from a helium-neon laser at 633 nm was coupled into the vacuum chamber by means of a single-mode polarizationmaintaining optical fiber. The laser is offset-locked via a transfer helium-neon laser 14 to an iodine-stabilized reference laser. The lock is accomplished by temperature tuning of the laser as described in Ref.…”

Frequency stabilized laser for length metrology system in Joule Balance

“…We note two characters of this method: First, because of the high optical beat frequency(100MHz-1.2GHz), the signal from APD needs to be frequency-devided by 64 and then sent to CPLD for frequency counting. Second, the counter is gated by the multiple peirods of the modulation signal from the iodine-stabilized laser to perform synchronous averaging of the dither modulation [3].…”

Frequency stabilized three mode HeNe laser using nonlinear optical phenomena

“…These methods are, however, not typically suitable for practical interferometry applications. Instead, secondary standards are employed in a traceable chain and are more suitable in terms of cost, size, and ease of implementation [6].…”