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Applications of Vescent Photonics Products
The New SLICE-QTfour-channel temperature controller 
Vescent Photonics is the leader in precision lasers, electronics, and electro-optics for AMO physics.  But did you know that our products are being used in a number of other photonics applications which require precise control over laser light?  Here are but a few examples of Vescent products hard at work in the world of physics.
Frequency Comb Stabilization

The tooth spacing of a frequency comb must be stabilized in order to use the comb for analytical purposes such as transferring a frequency standard from one portion of the spectrum to another or for precision spectroscopy.

Shu-wei Wong and coworkers at the UCLA Department of Electrical Engineering have done just that by mixing the comb output with a reference frequency generated by a stable microwave synthesizer and using this as an error signal which was processed by the Vescent D2-125 Reconfigurable Servo to control the pump power delivered to the comb. In this way, they realized a 50 dB suppression in the Allan deviation of the comb tooth spacing.

Read complete application note
Large Offset Phase Locks

The D2-135 Offset Phase Lock Servo will provide a true phase lock between a master and slave laser with a user-adjustable offset between 250 MHz and >9.5 GHz.  But how can you reach larger offsets still? 

This application note demonstrates a phase lock with frequency offset of 43.2 GHz by first impressing 20 GHz sidebands on the master laser and then using the heterodyne beat note between the slave laser and the second sideband of the master laser as the error signal.

Synthesis of a 30 Hz Linewidth Millimeter and sub-Millimeter Waves  

François Bondu and his colleagues at the Institut de Physique de Rennes have mixed two stabilized DFB lasers to generate an extremely narrow, but highly tunable millimeter wave source.  

The D2-105 Laser Controller uses the Libbrecht-Hall circuit design to reduce the current noise seen by the DFB lasers, thus supporting this narrow-linewidth source for precision rotational and ro-vibrational spectroscopy.
Amplitude Stabilization of an Ultrafast MIR Source

Marinus Huber of the Ludwig-Maximilians University in Munich and his colleagues stabilized the intensity of the final output of a mode-locked Yb:YAG laser which, through intrapulse difference frequency generation, had its spectrum shifted to the 10 µm region.  
The RIN of the MIR output was reduced by up to a factor of 20, with rms (1 Hz to 100 kHz) noise of 0.05% over a 10 minute period.

Frequency Standards for Precision Spectroscopy

The well-known spectrum of Rubidium near 780 nm renders it an excellent candidate as a frequency reference.  Scott Bergeson of Brigham Young University and his colleagues measured the Yb I 1S 0 to 1P 1 transition to an accuracy of better than 0.5 ppb, at 399 nm, in part by transferring the accurately known frequency of the F=2 to F'=(2,3) D2 line of 87Rb to a doubled Ti:sapphire laser via a frequency comb.

The D2-100 Distributed Bragg Reflector Laser is easily locked to the Doppler-free hyperfine spectrum of Rubidium by using the D2-210 Saturated Absorption Spectroscopy Module and D2-125 Reconfigurable Servo. This complete sub-system acts as a stable frequency reference.

If you have any questions regarding any of these papers, application notes, or our laser and control products, please feel free to contact me.

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Michael Radunsky, Ph.D.
Vice President of Sales & Marketing
+1 (303) 296-6766 x63
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