Del Mar Photonics - Newsletter
Birefringent Filter Tuning -
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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.
Publications:
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)
S.M.Kobtsev.
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)
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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 -
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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 -
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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 -
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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.
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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 -
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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