Del Mar Photonics offers variety of standard and custom quartz rotators. Below is an example of custom inquiry. Send your inquiry today!

Customer Inquiry:
Recently, I started designing a pump laser that has the following beam parameters:
120J pulse energy, 20ns Gaussian pulse, 57mm FWHM beam diameter (third order super-Gaussian beam), laser wavelength=1054nm. (Nd:phosphate glass) The laser beam polarization is linear, and the angle is 45 degrees from the table. To compensate for the birefringence from the 64mm Nd:phosphate glass rod, we want to insert one quartz fixed rotator (90 degree) between the two final amplifier heads. We have two such beam lines.

In summary I'd like to get a quotation for two crystal quartz fixed rotators for 90 degree rotation. Since the beam size is about 60mm, I think the quartz rotator should be at least 65mm in diameter. I don't know how thick this crystal quartz should be to give 90 degree rotation, so please let me know the required thickness as well when
you send me the quote. We want these quartz rotators to be AR coated at 1054nm. V type coating looks fine to me. The damage threshold needs to be higher than 5J/cm^2 at 1054nm, 20ns pulse.

Quartz rotatords are the standard part in many of Del Mar Photonics producst, including Kirra Faraday Isolators. We are able to supply almost any high quality crystal quartz component at competitive price. Send your inquiry today!

Operation of an optical broadband Isolator
Laser light, polarized or not, enters the input polarizer and is linearly polarized in, for instance the horizontal plane (0°). As linearly polarized light enters the Faraday rotator rod, the plane of polarization rotates as the light propagates along the axis of the rod. The Faraday rotator is tuned to rotate the plane of polarization by 45°. The light then passes through the quartz rotator and the net rotation is 90°. The output polarizer is oriented at 90° allowing most of the light to emerge from the output of the Isolator. Any back-reflected light re-enters the isolator through the output polarizer and becomes polarized at 90°. It then passes through the quartz compensator and Faraday rotator, where the quartz compensator rotates the polarization by 45° in one direction, while the Faraday element produces 45° rotation in the opposite direction, the total rotation becomes 0° and the back-reflected radiation is stopped by the input polarizer. Thus, the laser is isolated from retro-reflected beams that may occur in the application part of the optical set. Moreover, the wavelength dependence of Faraday rotation for backward beam is substantially compensated by the rotation in the quartz compensator.

Waveplate - e-mail request

Waveplates are used to change the polarization type of the incident radiation by unequally phase-shifting its orthogonally polarized components.
Del Mar Photonics manufactures Multiple Order and Cemented Zero Order Quarter and Half Waveplates from high quality artificial crystal quartz.
Multiple Order Waveplates are fabricated from a single 1 mm thick plate, pic.2. The retardence at the specified wavelength is equal to an integral namber of waves plus 1/4 or 1/2 λ.
Zero Order Waveplates are made from two individual plates of crystalline quartz, optically contacted with the direction of retardation opposed, pic.1. The final retardation is the net difference in retardation of the two plates, 1/4 or 1/2 λ.

Achromatic l/2 waveplate

Achromatic l/4 waveplate

Standard specification

Material	Crystal Quartz
Design wavelength	Waveplate can be designed and fabricated at any wavelength between 250 and 1550 nm
Diameter	Ø 12.7 and Ø 25.4 mm
Thickness L	Multiple: ~1 mm Zero Order: ~2 mm
Tolerance	Diameter: +0.0/-0.25 mm
Surface Quality	S/D 10/5
Wavefront distortion	λ/10 @ 633 nm
Parallelism	Multiple: < 1 arcsec Cemented zero order: < 30 arcsec Optically-contacted zero order: < 1 arcsec
Reterdation tolerance	λ/300 at 22°C
Bevels	None
Chips	< 0.4 mm
AR coating	R < 0.25% @ designed wavelength
Max. handling power	Multiple: 200 MW/cm², pulsed Cemented zero order: 1 W/cm², CW Optically-contacted zero order: 200 MW/cm², pulsed

Product news and updates - Training Workshops - Featured Customer - Other News

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Del Mar Photonics, Inc.
4119 Twilight Ridge
San Diego, CA 92130
tel: (858) 876-3133
fax: (858) 630-2376
Skype: delmarphotonics
sales@dmphotonics.com

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