Del Mar Photonics - Newsletter

Birefringent Filter Tuning - request a quote for Birefringent Filter

One of the most widely used methods of primary narrowing of the emission spectra of CW tunable lasers employs various modifications of the Birefringent Filters (BF), commonly reffered to as the Lyot filters.

The birefringent filters, which we use in the CW Dye Lasers and in the Ti:Sapphire lasers, are specially optimized for reception of the largest tuning ranges of wavelengths of the radiation at various levels of the pump power and at the various active mediums. The some our papers is devoted to the analysis of the selective properties of BF. By result of the our detailed researches the BF is an establishment of new properties of birefringent filters in the optical cavity. The main results is:
a general formula is found for the angle of tilt at which the BF transmission function has the highest contrast;
it is determined optimum the ratios of plate thicknesses for a three-element BF for a case of integral and nonintegral ratios;
variations of the free spectral range and the BF tuning factor with the angle between the optic axis and the main plane of the phase plate are calculated;
the dependence of the tuning range of a BF for a given degradation of the transmission function contrast on the orientation of the optic axes of the phase plate is obtained;
the possibilities and advantages of using a BF with plate thiknesses differing by a factor other than an integer are shown;
the criteria for the selection of the parameters of BF for the pico- and femtosecond tuning lasers are formulated.


B.V.Bondarev, S.M.Kobtsev.
Calculation and Optimization of a Birefringent Filter for a CW Dye Laser.
Opt. Spectrosc., 1986, v.60, N4, p.501-504. (445 kB)

Properties of Birefringent Filters.
Opt. Spectrosc., 1987, v.63, N5, p.672-675.

S.M.Kobtsev, N.A.Sventsitskay.
Application of Birefringent Filters in Continuous-Wave Tunable Lasers: a Review.
Opt. Spectrosc., 1992, v.73(1), p.114-123. (846 kB)
Return to AMETIST Dye Laser Home Page


Wavelength tuning

The standard tuning elements indicated below are used in CW Ti:Sapphire lasers such as Trestles CW , Trestles fs/CW as well as TIS-SF-777
wavelength tuning: Birefringent filter - thick etalon - thin etalon

Those elements are also sold separately as standrad items or as a custom made components.

1) Thick etalon - request a quote
Thickness - 3 mm, diameter - 20 mm. Surface quality: Ð=1-2, N<1, ΔN<0.1,
λ/10, plane parallelism better than 10''. Thickness accuracy 5 um.

2) Thin etalon - request a quote
Thickness - 200 um, diameter - 15 mm. Surface quality: Ð=1-2, N<1, ΔN<0.1,
λ/10, plane parallelism better than 10''. Thickness accuracy 5 um.

3) Birefringent filter BRF - request a quote



    Manual 3-plate BRF filter for CW wavelength tuning  Buy Now 
    Thick (thin) etalon with mount (manual tuning)  Buy Now 
    Thick (thin) etalon with mount (step motor controlled tuning)  Buy Now 
    Upgrade to USB step motor controlled tuning slit with software  Buy Now 
    USB 3-plate BRF for CW wavelength tuning with software  Buy Now 


Del Mar Photonics offers new Trestles fs/CW laser system which can be easily switched from femtosecond mode to CW and back.
Having both modes of opeartion in one system dramatically increase a number of applications that the laser can be used for, and makes it an ideal tool for scientific lab involved in multiple research projects.

Del Mar Photonics is your one stop source for ultrafast (femtosecond) as well as continuum wave (CW) narrow linewidth Ti:Sapphire lasers Trestles LH Ti:Sapphire laser
Trestles LH is a new series of high quality femtosecond Ti:Sapphire lasers for applications in scientific research, biological imaging, life sciences and precision material processing. Trestles LH includes integrated sealed, turn-key, cost-effective, diode-pumped solid-state (DPSS). Trestles LH lasers offer the most attractive pricing on the market combined with excellent performance and reliability. DPSS LH is a state-of-the-art laser designed for today’s applications. It combines superb performance and tremendous value for today’s market and has numerous advantages over all other DPSS lasers suitable for Ti:Sapphire pumping. Trestles LH can be customized to fit customer requirements and budget.

Reserve a spot in our Femtosecond lasers training workshop in San Diego, California. Come to learn how to build a femtosecond laser from a kit

Typical specifications are:

Trestles fs/CW laser system - request a quote
Ti:Sapphire femtosecond oscillator with CW operation option
Spatial mode: TEMoo;
Polarization: linear horizontal;
fs mode:
Tuning range (@10W pump): 750-850 nm;
Output power (@10W pump, 800 nm): >1500 mW;
Repetition rate: 80 MHz;
Pulse duration: <100 fs;
CW mode:
Tuning range (@10W pump): 750-850 nm;
Output power (@10W pump, 800 nm): >2000 mW in CW;
Linewidth (with two etalons): <2 GHz
Also included:
Thermostabilized breadboard;
Electronic starter with TTL output for mode-locked mode observation;
USB-controlled tuning slit for wavelength tuning in fs mode;
3-plate USB-controlled birefringent Lyot filter;
Two motorized USB-controlled etalons for linewidth control